77 results on '"Dynamics (mechanics)"'
Search Results
2. Analysis of Kinematics and Dynamics of 3UPU/PU Parallel Platform Used in Automatic Wave Compensation
- Author
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Guang Can Lu
- Subjects
Engineering ,SIMPLE (military communications protocol) ,business.industry ,Dynamics (mechanics) ,General Engineering ,Kinematics ,Compensation (engineering) ,Deck ,Euler method ,symbols.namesake ,Hydraulic cylinder ,Acceleration ,Control theory ,symbols ,business ,Simulation - Abstract
3UPU/PU parallel platform is able to achieve a linear and two rotating motion (3-DOF ) platform,it can used in automatic wave compensation of ship deck equipment. The compensation platform is composed of dynamic and static plate, hydraulic cylinder and driven chain parts; it has strong capacity , simple structure and suitable for most conditions. This paper analysis the motion of the platform using one order and two order influence coefficient, establishes the dynamic model of this platform using the Newton Euler method , obtained the velocity, acceleration and force curve by simulating calculation, lay the foundation for the stable platform’s further dynamic analysis and control.
- Published
- 2014
3. Rigid-Flexible Coupling Dynamics Analysis for a Twin-Rotor Piston Engine
- Author
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Cun Yun Pan, Xiang Zhang, Teng An Zou, and Lei Zhang
- Subjects
Coupling ,Engineering ,business.industry ,Rotor (electric) ,Dynamics (mechanics) ,General Engineering ,Mechanical engineering ,Rotary engine ,law.invention ,Vibration ,Piston ,Software ,law ,Differential (infinitesimal) ,business ,Simulation - Abstract
Twin-rotor piston engine (TRPE) is a new differential rotary engine, which is still under developing. In this paper, a rigid-flexible coupling dynamics model was established for the prototype TRPE-350. By combining the multi-body dynamics simulating software RecurDyn and the finite analysis software ANSYS, the TRPE′s performances were studied. Vibration analysis for rigid-flexible coupling model was analyzed. The simulation results can be found that the simulated overall changing trends match with the actual movement of the TRPE very well. So it provides a theoretical tool for further optimization and improvement of this engine.
- Published
- 2014
4. The Multi-Body Dynamics Contact Simulation on Transmission Gears
- Author
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Xiao He Deng
- Subjects
Engineering ,Multi body ,business.industry ,Dynamics (mechanics) ,General Engineering ,Mechanical engineering ,Differential (mechanical device) ,symbols.namesake ,Fourier transform ,Software ,Non-circular gear ,Transmission (telecommunications) ,symbols ,business ,Simulation - Abstract
Based on the theory of gear dynamics and contact, the paper uses multi-rigid-body dynamics software ADAMS to build transmission simulation model. The model takes the highest shift gears of a transmission as objects to finish gear meshing simulation analysis. The corresponding meshing force and its Fourier transform results are acquired based on the analysis to get the transmission gears meshing properties.
- Published
- 2014
5. Dynamics Analysis of Manipulator in the Hot Line
- Author
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Dan Dan Zhang
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Parallel manipulator ,Robotics ,Kinematics ,Control theory ,Line (geometry) ,Robot ,Artificial intelligence ,Connecting rod ,business ,MATLAB ,computer ,computer.programming_language - Abstract
The high voltage transmission lines exposed for a long time are often broken down, thus, The manipulator arm of robot in the hot line was designed, The design is reasonable through kinematical analysis. First, make sure of the connecting rod coordinates and the connecting rod's D-H parameters. Matlab was used to draw 3D model of manipulator. Use functions in the Robotics Toolbox to solve kinematics analysis.
- Published
- 2014
6. Analysis of Vehicle Tire Impact Force Based on Collision Model
- Author
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Xin Guan, Wen Jun Ma, and Ping Ping Lu
- Subjects
Engineering ,Chassis ,business.industry ,Dynamics (mechanics) ,General Engineering ,Process (computing) ,Collision model ,Structural engineering ,Contact force ,Function model ,Coefficient of restitution ,Impact ,business ,Simulation - Abstract
The effect of impact force on vehicle tires is a complex process. Accurately chassis dynamics analysis need to consider the influence of impact force. This paper uses collision model to solve it and then successfully establish Impact function model Hysteretic damping model and Modified hysteretic damping model based on the C language. Analysis the result of impact contact force of tire vertical landing. In the coefficient of restitution close to 1, the simulation results of the three models have no greater difference. While the Hysteretic damping model simulation result is different from the other two models in the coefficient of restitution is relatively small.
- Published
- 2014
7. Status Analysis of the Frozen Soil’s Dynamics Parameter Study
- Author
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Qin Liao, Ling Zhi Cui, Fei Luo, Yi Ting He, and Gao Min Li
- Subjects
Engineering ,Damping ratio ,Dynamic modulus of elasticity ,business.industry ,Dynamics (mechanics) ,Constitutive equation ,General Engineering ,Applied mathematics ,Geotechnical engineering ,business ,Soil mechanics ,Dynamic elastic modulus - Abstract
In this paper, the author points out several key problems needed to be solved about the dynamics of frozen soil by reviewing related literatures about hysteretic curve of frozen soil ,dynamic constitutive relation and dynamical parameter. The problems are the insufficient understanding on morphological characteristics of hysteretic curve and how to transform qualitative understanding into quantitative understanding about morphological characteristics of hysteretic curve. The problem is the rationality of selecting the dynamic constitutive model, namely how to establish the engineering applicable model which conforms to the actual soil mechanics performance.The problem is the rationality of the calculation method about dynamic elastic modulus and damping ratio, namely how to define dynamic modulus of elasticity of frozen soil correctly and the limitation of using the classical method to calculate the damping.
- Published
- 2014
8. Simulation Analysis of Kinematics and Dynamics of 3-TPS Hybrid Robot
- Author
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Tian Biao Yu, Wan Shan Wang, Jia Shun Shi, Li Da Zhu, and Shuang Wang
- Subjects
Mechanism design ,Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Control engineering ,Kinematics ,law.invention ,Software ,law ,Drive shaft ,Key (cryptography) ,Control system design ,Robot ,business ,Simulation - Abstract
The paper aims at the questions of electromotor selection and mechanism design, which is effectively solved by the virtual prototype technology. Firstly, the three-dimensional model of hybrid machine tool is built by using SolidWorks software. Secondly, the assembled model is channeled into ADAMS/View, and then formed the virtual prototype simulation model with mute-body dynamics. Velocity and driving force curve of each driving shaft is got by analyzing the kinematics and dynamics of the hybrid machine tool. Maximum velocity and maximum driving force each driving shaft can find out by the method of space search. Therefore, the kinematics and dynamics properties of 3-TPS hybrid machine tool is obtained, which provide proof for machine electromotor selection, framework design and control system design. Key words: Hybrid robot; Kinematics; Dynamics; ADAMS; Simulation
- Published
- 2014
9. Human Knee Dynamics Simulation and Application of Three Dimensional Finite Element Analysis
- Author
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Hua Ding and Yan Ming Fu
- Subjects
musculoskeletal diseases ,Engineering ,business.industry ,Numerical analysis ,Dynamics (mechanics) ,General Engineering ,Biomechanics ,Structural engineering ,Knee Joint ,Finite element method ,Dynamic simulation ,Gait (human) ,business ,human activities ,Joint (geology) ,Simulation - Abstract
Mechanical properties of the structure of human body joint always is an important research topic of biomechanics, the biomechanics of the knee joint research, this article through the establishment of a complete dynamic model of the gait cycle of human knee joint of human lower limb gait has carried on the numerical analysis, simulated by dynamic mechanical parameters of the structure of the human body joint, three-dimensional finite element model for the knee joint, through calculation and analysis to determine the rule of the inside of the knee joint dynamic stress, strain, for the study of complex shapes and complex load and complex material of human body joint provide a research idea.
- Published
- 2014
10. Stability Prediction and Dynamics Analysis of Milling with Variable Pitch Cutter in Low Radial Immersion
- Author
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Gang Jin, Hou Jun Qi, and Li Yan Lou
- Subjects
Engineering drawing ,Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Mechanics ,Stability (probability) ,Variable (computer science) ,Chart ,Stability lobes ,Immersion (virtual reality) ,Focus (optics) ,business ,Bifurcation - Abstract
By disrupting the regenerative effect, milling cutters with variable-pitch are usually used to improve stability. Since high interrupted cutting processes, such as low radial immersion case, will result in more nonlinear phenomena and some consequent differences of stability chart, in this paper, an improved semi-discretization algorithm is utilized to predict the stability lobes for variable-pitch milling under low radial immersion ratios, the focus of the current manuscript is to investigate the stability trend caused by tool geometries. In addition, the chart differences in the cases of low and high radial immersion milling are also discussed by comparisons. Under certain combinations of parameters, some phenomena, like bunch of isolated island and flip bifurcation region are described, and some influences of tool geometries on stability trends are shown and explained.
- Published
- 2014
11. Dynamics Analysis of Vertical Transferring Frame of Garbage Container
- Author
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Jia Yuan Zhang, Tian Min Guan, Lei Lei, and Li Wu
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,Frame (networking) ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,General Engineering ,Process (computing) ,ComputerApplications_COMPUTERSINOTHERSYSTEMS ,Structural engineering ,Displacement (vector) ,Hydraulic cylinder ,Vehicle frame ,Container (abstract data type) ,business ,Garbage ,Simulation - Abstract
In order to decrease the maintain cost and simplify the operation process of the frame of garbage transferring vehicle, a new scheme of vertical transferring frame of garbage container is provided, and the unloading process of the frame is given. The prototype model of the vehicle frame in unloading process is built. The simulated curve of the displacement of the lifting hydraulic cylinder and the turning angle of frame is accord with the theoretical computed one. By running the dynamic model, the dynamic curve of the force of the lifting hydraulic cylinder, the force of the sliding hydraulic cylinder, the force of the lug on sliding frame acted to container and the force of ground acted to container are obtained, which provide basis on designing the structure of the frame.
- Published
- 2014
12. The Dynamics Simulation of Tracked Vehicles on the Hard and Soft Ground Based on the RecurDyn
- Author
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Ya Yu Huang, Chong Kai Zhou, and Li Ni
- Subjects
Vehicle dynamics ,Engineering ,Process dynamics ,business.industry ,Dynamics (mechanics) ,General Engineering ,computer.software_genre ,Track (rail transport) ,business ,computer ,Simulation ,Simulation software - Abstract
In order to accurately study a tracked vehicle movement on the ground in hard and soft features, this paper uses multi-body dynamics simulation software RecurDyn tracked vehicle subsystems Track (LM), establishing a three-dimensional multi-body vehicle dynamics model. For tracked vehicles at an inclination of 10 degrees slope, through the soft and hard ground steering process dynamics simulation and comparative analysis. This paper provides an accurate basis for the future in-depth research on Tracked vehicle.
- Published
- 2013
13. Investigation on Dynamics of Ultrasonic Surface Rolling Process
- Author
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Xiao Hui Zhao and Yu Liu
- Subjects
Surface (mathematics) ,Materials science ,Universal Software Radio Peripheral ,business.industry ,Acoustics ,Dynamics (mechanics) ,General Engineering ,Process (computing) ,Structural engineering ,Piezoelectricity ,Finite element method ,Ultrasonic sensor ,Impact ,business - Abstract
Ultrasonic surface rolling processing (USRP) is a surface nanocrystallization method developed recently, which can bring metal surface with superior properties. In order to obtain the motion state of the processing tip during USRP, a 3D dynamic finite element model was adopted to simulate the response of processing tip. The model parameters were provided by piezoelectric force sensor test system. Simulated results indicate that the peak value of impact force forms at the time of 25μ̓ and the maximum speed of working tip forms at the time of ̃̀μ̓.
- Published
- 2013
14. Dynamics System Simulation Study of Locking Mechanism for Aviation Aircraft Based CATIA and ADAMS
- Author
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Ning Shan, Xia Liu, Tuan Jie Liu, and Xue Yan Hu
- Subjects
Engineering ,Software ,Aviation ,business.industry ,Interface (computing) ,Dynamics (mechanics) ,General Engineering ,Flight safety ,Locking mechanism ,Geodetic datum ,business ,Interference (wave propagation) ,Simulation - Abstract
Locking mechanism of aviation aircraft is very important for perform mission. In order to avoid motion interference of locking mechanism efficiency and ensure mission completion and flight safety, its motion interference is analyzed based on its working theory. The spatial distribution of locking mechanism is designed in reason. The 3D solid assembly model of locking mechanism is constructed by using CATIA software. By the seamless interface program Sim-Designer between CATIA and ADAMS, dynamics simulation of locking mechanism system is realized in the circumstance of ADAMS. Its motion law is studied through simulation under the loading condition. The results show that there are good coincidence between simulation results and theoretical calculation datum. The method has more practicability and reasonability for the dynamics study of locking mechanism. And it offers theoretical basis for design and use of locking mechanism.
- Published
- 2013
15. Dynamics Simulation Analysis of Impact Mechanism in Impact Vibration Roller
- Author
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Guang Hua Nie, Xue Fang Du, and Shuai Zhang
- Subjects
Vibration ,Mechanism (engineering) ,Dynamic simulation ,Engineering ,Software ,business.industry ,Dynamics (mechanics) ,General Engineering ,Angular velocity ,Structural engineering ,Kinematics ,Software simulation ,business - Abstract
the paper adopts dynamic simulation software ADAMS for establishing virtual prototype model, and dynamics simulation analysis study is conducted on the impact mechanism in order to better study the impact mechanism in impact vibration composite roller with round idler wheels. The kinematics features and dynamics features are studied. The theoretical curves of rail disk opening size and driving angular velocity is obtained. The rail disk structure is improved, and it is proved through software simulation that the improved mechanism is beneficial for improving the impact efficiency of the roller.
- Published
- 2013
16. Dynamics Simulation and Analysis of Planetary Reducer
- Author
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Yuan Yuan Yi and Ling Ling
- Subjects
Coupling ,Flexibility (engineering) ,Engineering ,business.product_category ,Reducer ,business.industry ,Dynamics (mechanics) ,General Engineering ,Mechanical engineering ,Structural engineering ,Finite element method ,Planet ,Electric vehicle ,Boundary value problem ,business - Abstract
Taking a planetary reducer in an electric vehicle as the object of study, a rigid-flexible coupling model was established to perform the dynamics simulation. The variational regularities of the meshing forces, output speed and acting forces of bearings were obtained, and then a finite element analysis of the planet carrier was carried out. This method can not only solve the problem of the boundary conditions of planet carrier which are difficult to define in finite element analysis, but also improve the accuracy of analysis results when the influence of carrier flexibility on the whole system is considered in dynamics simulation, which lays the foundation for further research on reducers.
- Published
- 2013
17. The High Speed Influence on Inherent Frequency of Motorized Spindle
- Author
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Bo Wang, Bang Chuan Wen, and Kun Peng Xu
- Subjects
Coupling ,Centrifugal force ,Engineering ,Bearing (mechanical) ,business.industry ,Dynamics (mechanics) ,General Engineering ,Bearing stiffness ,Stiffness ,Gyroscope ,Structural engineering ,Finite element method ,law.invention ,law ,medicine ,medicine.symptom ,business - Abstract
The paper determines the impact factors of high-speed spindle system including the centrifugal force, gyroscopic moments and the bearing stiffness softening, and builds the general spindle-bearing FEM considering high speeds. Taking a motorized spindle as example, the effect of centrifugal force, gyroscopic effect, the radial stiffness and the coupling factors are analyzed qualitatively and quantitatively. Finally the research shows the variations of bearing radial stiffness, centrifugal force and gyroscopic moments have a significant effect on dynamics of spindle system in high speeds, while modeling the high speed spindle system, above factors must be considered.
- Published
- 2013
18. Simulation on Torpedo Unsteady Hydrodynamic with the Movement in the Longitudinal Plane
- Author
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Shao Zhu Wang, Ming Yang, Han Ping Wang, Lin Peng Wang, and Shi Ping Zhao
- Subjects
Engineering ,business.industry ,Movement (music) ,Dynamics (mechanics) ,General Engineering ,Motion (geometry) ,Angular velocity ,Mechanics ,Physics::Fluid Dynamics ,Quality (physics) ,Classical mechanics ,Compressibility ,Underwater ,business ,Trajectory (fluid mechanics) - Abstract
The unsteady hydrodynamic accurate calculation is the premise of submerged body trajectory design and maneuverability design. Calculation model of submerged body unsteady hydrodynamic with the movement in the longitudinal plane was established, which based on unsteady three-dimensional incompressible fluid dynamics theory. Variable speed translational and variable angular velocity of the pitching motion in the longitudinal plane of submerged body was achieved by dynamic mesh method. The unsteady hydrodynamic could be obtained by model under the premise of good quality grid by the results. Modeling methods can learn from other similar problems, which has engineering application value.
- Published
- 2013
19. Study of Dynamics Characteristics for Precision Motor Spindle System
- Author
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Jun Zheng, Qiu Shi Han, and Hong Jun Wang
- Subjects
Timoshenko beam theory ,Engineering ,Bearing (mechanical) ,business.industry ,Modal analysis ,Dynamics (mechanics) ,General Engineering ,Natural frequency ,Structural engineering ,Finite element method ,law.invention ,Modal ,law ,Spring (device) ,business - Abstract
The structure of a precision high speed spindle system is described. The shaft and bearing finite element models of the spindle system are constructed by using the Timoshenko beam element and the spring-damper unit. The static mechanical properties of spindle system and modal analysis are studied with different spring element arrangement forms. The results showed that the rotary speed designed was far lower than the critical rotary speed which matched with the low-order modal natural frequency of the spindle,so resonance vibration could be effectively avoided.
- Published
- 2013
20. Dynamic Simulation of a Passive Walking Robot with Friction and Impact
- Author
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Shan Ping Zhang, Yong Xu, and Xin Yao Song
- Subjects
Dynamic simulation ,Robot kinematics ,Engineering ,Gait (human) ,Time history ,business.industry ,Control theory ,Dynamics (mechanics) ,General Engineering ,Robot ,Passive walking ,business ,Simulation - Abstract
This paper design an unpowered wadding duck robot based on the non-smooth dynamics as well as friction and impact effects. The duck robot can swing-roll-slip stably and periodically along the slope down without any external drives and controls. The motion characteristics of the robot are investigated and the motion parameters simulations of the passive movement gait are subsequently implemented. The time history of the dynamic parameters showed an obvious cyclical variation, which indicates the robot is able to achieve cyclical, stable passive movement.
- Published
- 2013
21. The Dynamics Studies of a Four-Axle Bogie of Locomotive
- Author
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Yu Qiang Ma and Xiao Xia Zhang
- Subjects
Engineering ,Axle ,business.industry ,High adhesion ,Dynamics (mechanics) ,General Engineering ,Axle load ,Structural engineering ,Suspension (vehicle) ,business ,Axle track ,Bogie - Abstract
A type of bogie structure was proposed for the eight-axle locomotive, of which the middel bogie forme was used to connect the two B0 bogie and support the car body with three suspensions. A single drawbar connect the B0 bogie and car body directly to transfer the longitudinal forces. This structure is simple and feasibility, which can achieve high adhesion availabillity and good dynamic performances. Three suspension can achieve a excellent stability of car body. Comparing with a same speed and axle load class 2C0 locomotive, the wheelset lateral force and wheel rim wear factor are reduced by about 35% at the R300m small radius curves, and the wheelset lateral force is decreased by 15%, and the rim wear factor is reduced by 23% at the R800m curves.
- Published
- 2013
22. Performance Research on Tension Leg Platform of Floating Offshore Wind Turbine
- Author
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Yue Wen Gao, Chun Li, and Xin Cheng
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Structural engineering ,Turbine ,Mechanism (engineering) ,Offshore wind power ,Submarine pipeline ,Time domain ,Surge ,business ,Tension-leg platform ,Marine engineering - Abstract
Platform structure is the basic guarantee for safety operation of offshore wind turbine. Based on the boundary element method and combined with multi-body dynamics, analyzing motion response and wave force mechanism to the platform structure, and obtained the dynamic response and the wave force change of the platform structures in time domain, last analyzes the motion response and wave force change of tension leg platform in surge, sway and heave also roll, pitch and yaw direction. The results show that the maximum response of sway and the minimum response of surge have the same direction, it is the same with the maximum response of pitch and the minimum response of roll ; Motion responses of heave and yaw change not as acutely as other four directions ; In time-domain variation range, motion response of surge, heave and pitch change acutely, while motion responses of sway, roll and yaw change slightly. Wave force focus mostly in heave and pitch direction. The results is high reference value on offshore tension leg platform structural design and optimization.
- Published
- 2013
23. The Simulation of Vibration Mechanism and Dynamics Analysis of Eccentric Shaft of Billet Caster
- Author
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Da Dong Ma, Xiao Gang Ma, Jia Lian Shi, and Gui Yun Meng
- Subjects
Engineering ,Caster ,business.industry ,Dynamics (mechanics) ,General Engineering ,Structural engineering ,Mechanism (engineering) ,Vibration ,Stress (mechanics) ,Software ,Vertical direction ,Transient (oscillation) ,Physics::Chemical Physics ,business - Abstract
The model of vibration mechanism is built with Pro/E software. Simulate the vibration mechanism and obtain the cosine curve of the vibration table in the vertical direction by Pro/E. Afterwards, perform transient dynamics analysis of eccentric shaft in the vibration mechanism, and get the maximum average stress and the dangerous section. The simulation is correct and the dynamics analysis is accurate, which lays the foundation for the analysis, design and manufacture.
- Published
- 2013
24. Dynamics Analysis in Rigid-Flexible Coupling of Reinforced Steel Length Bodies with Friction Wheel
- Author
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Peng Huang, Jun Sun, Ling Lu, and Jun Qing Chen
- Subjects
Contact friction ,Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Coupling (piping) ,Kinematics ,Structural engineering ,Rigid body ,business - Abstract
This thesis studies how reinforced steel completes digital length design after being straightened.In general,the analysis of kinematic and dynamic to reinforced steel does not be considered the role of the flexible components in institutional kinematic. The program regards reinforced steel as a flexible body and sees friction wheel as rigid body. The contact between friction wheel and steel is the rigid-flexible coupling[3].With the simulation analysis in ADAMS,I research the problem that reinforced steel produces the slide or not in different speed and contact friction coefficient, in order to determine the design and operating parameters of the cut-to-length body and ensure the accuracy. The result has a good engineering significance in the design of the length structure optimization and operating parameters [4].
- Published
- 2013
25. Review on the Dynamics of High-Speed Motorized Spindle System
- Author
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Hong Jun Wang, Xiao Ming Dai, and Qiu Shi Han
- Subjects
Engineering ,Bearing (mechanical) ,business.industry ,Dynamics (mechanics) ,Transfer-matrix method (optics) ,General Engineering ,Mechanical engineering ,Control engineering ,Systems modeling ,Finite element method ,law.invention ,System dynamics ,law ,Thermal ,Electromechanical coupling ,business - Abstract
The research on the dynamics modeling in theory and experiment for the rolling bearing-motorized spindle system including bearing modeling and spindle-bearing system modeling is reviewed. The main factors influencing the motorized spindle system dynamics are analyzed combined with the pratical engineering, which include thermal characteristics, high-speed effects and electromechanical coupling. The methods for dynamics modeling including the transfer matrix method and finite element method are related. Finally, the research directions on the dynamics of rolling-bearing motorized spindle system are forecasted.
- Published
- 2013
26. Kinematics and Dynamics Simulation of Feed Mechanism of Sewing Machine Based on SimMechanics
- Author
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Bao Cheng Ding, Liang Sheng Zhou, and Xiao Zheng Dang
- Subjects
Mechanism (engineering) ,Engineering ,Sewing machine ,business.industry ,Dynamics (mechanics) ,General Engineering ,Control engineering ,State (computer science) ,Kinematics ,business - Abstract
Planner six-bar mechanism is widely used in the textile industry. In this article, feed mechanism of sewing machine is studied. The kinematics and dynamics simulation model is established for this kind of mechanism. On the basis of it, a relevant simulation is carried out through SimMechanics. Thus, the motion rules and stress state for all parts of mechanism are described vividly. The simulation results show that this method is effective and efficient when the simulation is implemented for a certain machine system. Meanwhile, it provides a foundation for the further research of the mechanism in the future.
- Published
- 2013
27. Dynamic Modeling and Analysis of Tank Vehicle under Braking Situation
- Author
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Ying Wan, Zhi Gen Nie, and Li Mai
- Subjects
Engineering ,Transient state ,business.industry ,Slosh dynamics ,Response analysis ,Dynamics (mechanics) ,General Engineering ,Automotive engineering ,System dynamics ,Software ,Dynamic braking ,business ,MATLAB ,computer ,computer.programming_language - Abstract
Considering the instability of the direction dynamics of tank vehicle system under braking maneuver, the longitudinal equivalent model of liquid was formulated with consideration of both the steady-state and the transient state dynamics of the liquid. The Matlab/simulink program of the liquid was built and was combined with the vehicle model in Trucksim software to simulate and analyze the motion of the liquid cargo centroid and its dynamical effects on the vehicle under braking maneuver. It is observed that the liquid cargo slosh motion in tank vehicles has significant influences on braking performance, pitch motion and perpendicular motion of the vehicle. The results of this paper have significant help for studies on dynamics of vehicle tankers under braking maneuver and ensurement of braking stability and security.
- Published
- 2013
28. Experimental Device of Drilling String Dynamics in Horizontal Well and its Application
- Author
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Zhichuan Guan, Xin Wen, and Dong Dong Shao
- Subjects
Engineering ,Movement (music) ,business.industry ,Acoustics ,media_common.quotation_subject ,Dynamics (mechanics) ,General Engineering ,Drilling ,ComputerApplications_COMPUTERSINOTHERSYSTEMS ,Similitude ,Set (abstract data type) ,Bit (horse) ,Debugging ,C++ string handling ,business ,Simulation ,media_common - Abstract
According to the principle of similitude, a simulation experimental device for investigating drilling string dynamics in horizontal well was designed and set up. The rotary speed, WOB, drilling string lateral displacement, bottom hole WOB fluctuations and lateral force of the bit, etc. can be measured under different WOB and rotary speed by the experimental device; Some debugging experiments have been done by means of the device under different weights on bit and rotary speeds. The simulated experiment has many advantages comparing to the actual experiment, such as less operators, less times and moneys. It is easy to operate, the drilling string movement can be visually observed and all of the experimental results can be used to the actual drilling.
- Published
- 2013
29. Exoskeleton Finger Rehabilitation Robot Dynamics Simulation Analysis
- Author
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Ji Rong Wang, Jiang Wei Song, Tian Yi Li, Mei Li Yu, Yu Wang, and Li Li Yang
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Process (computing) ,Rehabilitation robot ,Cylinder (engine) ,law.invention ,Exoskeleton ,Dynamic simulation ,law ,Torque ,Point (geometry) ,business ,Simulation - Abstract
In this paper, an exoskeleton mechanical finger for rehabilitation has been designed. It has two finger knuckles which are driven by two cylinders separately. In the simulation process of ADAMS, the two cylinder driving stems are set different movement speeds and then the two finger-knuckles can be tracked as specific trajectories. The joint force and the torque curve of the exoskeleton mechanical finger at the point of the two knuckles can be got at different cylinder driving speeds.
- Published
- 2013
30. The Research on the Dynamics of High-Speed Friction and Wear Test System in Mechanical Engineering
- Author
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Jian Gang Sun, Mei Ying Chen, Tie Jun Li, and Xue Sen Zhang
- Subjects
Vibration ,Engineering ,Software ,Modal ,business.industry ,Dynamics (mechanics) ,General Engineering ,Mechanical engineering ,Workbench ,Equations of motion ,business ,Statics - Abstract
By researching the dynamics of high speed friction and wear test system, establish the statics and dynamics model of high-speed dial and get the equation of motion of turntable scrapers state. Using Ansys Workbench software platform analysis the order modal of the turntable, get the kinetic parameters of the system. Some suggestion and methods are proposed on avoiding vibration of turntable system.
- Published
- 2013
31. Study on Computer Simulation for Car Handling Dynamics with 8 DOF
- Author
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Qun Sheng Xia, Xu Tao Liu, Peng Zhang, and Le He
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Dynamic simulation ,Vehicle dynamics ,Normal load ,Acceleration ,Software ,Automobile handling ,business ,MATLAB ,computer ,Simulation ,computer.programming_language - Abstract
A mathematical model of eight degrees freedom was built up with considering the normal load transfer due to the presence of the longitudinal, lateral acceleration for a vehicle under braking in turn condition. And the simulation model based on the mathematical model was eatablished by means of MATLAB/Simulink software. The comparison between simulation results and real vehicle test results under the snow pavement double-lane change condition is in good agreement. It can be concluded that the 8DOF vehicle dynamics model of this study is acceptable and valid.
- Published
- 2013
32. Dynamic Modeling and Analysis of Underactuated Prosthetic Hand
- Author
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Hua Deng, Yi Zhang, and Liang Tang
- Subjects
Engineering ,Correctness ,business.industry ,Underactuation ,Dynamics (mechanics) ,General Engineering ,Control engineering ,Kinematics ,Index finger ,System dynamics ,Computer Science::Robotics ,medicine.anatomical_structure ,Control theory ,Kinematics equations ,Trajectory ,medicine ,business - Abstract
Based on the kinematic equation of index finger, the trajectory space of fingertip is analyzed, and the structural parameters of underactuated prosthetic hand have been optimized by ADAMS, which compare the trajectory space with the index-finger. Using the modeling methods of Lagrange dynamics equation, the dynamic model is established for the three-joint underactuated prosthetic finger, whose kinematic and dynamic characteristics also are analyzed. Finally, by the construction of the virtual prototype and its introduction into ADAMS for the dynamics simulation, the correctness of kinematics and dynamics model is verified by the dynamics simulation of virtual prototype.
- Published
- 2013
33. The Virtual Prototype Modeling Research of a Wind Tunnel Test Platform with Member Flexibility
- Author
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Yan Zhong He, Li Jun Shi, Lan Lei Zhao, Lu Yang Li, and Wen Jia Chen
- Subjects
Flexibility (engineering) ,Engineering ,Basis (linear algebra) ,business.industry ,Test platform ,Dynamics (mechanics) ,General Engineering ,business ,Motion (physics) ,Simulation ,Wind tunnel test - Abstract
The rigid-flexible hybrid modeling of the wind tunnel test platform is established by means of ANSYS and ADAMS for more accurate analysis of the motion performance of the test platform in this paper. We get the kinematical characteristic curve based on the three working conditions of the pitching motion, yawing motion, rolling motion of the test platform. According to the characteristic curve indirectly reflects the rationality of the design configuration. So as to provide fundamental basis for the precision dynamics simulation analysis and make the real physical prototype are offered.
- Published
- 2013
34. Transient Dynamics Analysis of Hammer Rod Impact Based on ANSYS
- Author
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Wen Xin Xu, Jun Meng, Jing Jing Wang, Miao Xie, and Xu Hong Cui
- Subjects
Engineering ,genetic structures ,business.industry ,Dynamics (mechanics) ,General Engineering ,Structural engineering ,Finite element method ,law.invention ,Equivalent stress ,law ,Node (physics) ,Structure design ,sense organs ,Research Object ,Transient (oscillation) ,Hammer ,business - Abstract
Regarding the liquid-air hammer rod as the research object, the equivalent stress contour of the hammer rod has been obtained through transient dynamics simulation analysis of the hammer rod impact process by using finite element method. This paper has studied node rate response in different positions of the hammer rod to provide evidence for structure design of this kind of impact members.
- Published
- 2012
35. Theory of Yarn Dynamics during Unwinding from Packages
- Author
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Stanislav Praček
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,Frame (networking) ,General Engineering ,Motion (geometry) ,Angular velocity ,Structural engineering ,Mechanics ,Yarn ,visual_art ,visual_art.visual_art_medium ,Point (geometry) ,Transient (oscillation) ,business ,Slipping - Abstract
We derive the system of coupled nonlinear differential equations that govern the motion of yarn in general. The equations are written in a (non-uniformly) rotating observation frame and are thus appropriate for description of over-end unwinding of yarn from stationary packages. We comment on physical significance of virtual forces that appear in a non-inertial frame and we devote particular attention to a lesser known force, that only appears in non-uniformly rotating frames. We show that this force should be taken into account when the unwinding point is near the edges of the package, when the quasi-stationary approximation is not valid because the angular velocity is changing with time. The additional force has an influence on the yarn dynamics in this transient regime where the movement of yarn becomes complex and can lead to yarn slipping and even breaking.
- Published
- 2012
36. Finite Element Dynamics Analysis of Vibrating Feeder
- Author
-
Zheng Dong Su, De Biao Sun, Xue Dong Ma, and Jie Teng
- Subjects
Vibration ,Engineering ,Dynamic strength ,Modal ,Basis (linear algebra) ,business.industry ,Modal analysis ,Dynamics (mechanics) ,General Engineering ,Structural engineering ,business ,Finite element method ,Dynamic stress - Abstract
According to actual geometry size of vibrating feeder, the finite element calculating model for vibrating feeder box is established in this paper. ANSYS software is used to perform modal analysis and dynamic strength analysis for the vibration feeder box, and the former ten modal frequencies of the sieving box and dynamic stress of the sieving box whole is obtained, which provides a theoretical basis for strength design of the vibrating feeder.
- Published
- 2012
37. Launching Dynamics Simulation of Ship-Board Rocket Gun
- Author
-
Yi Jiang and Wei Zeng
- Subjects
Engineering ,business.product_category ,business.industry ,Dynamics (mechanics) ,Astrophysics::Instrumentation and Methods for Astrophysics ,General Engineering ,Spectral density ,Space launch ,Amplitude ,Rocket ,Wind wave ,Aerospace engineering ,Non-rocket spacelaunch ,business ,Energy (signal processing) - Abstract
As for the issue of ship-board rocket gun launch, the research on the influence of sea condition on initial disturbances of rockets was conducted. The launch system was simplified and the dynamics model was established. The energy spectral density of motion of ship in irregular waves was calculated based on ocean wave energy spectrum and the dynamic response of launch system was studied under three kinds of sea conditions. The result indicates that amplitudes of pitch and yaw increase, however, the rolling decreases when the sea condition level rises.
- Published
- 2012
38. In-Plane Dynamics of Multilayer A-Type U-Shaped Corrugated Structure Materials
- Author
-
Guo Hong Yao, Xiao Yong Pan, Deqiang Sun, and Yong Liu
- Subjects
Materials science ,business.industry ,Dynamics (mechanics) ,General Engineering ,Mode (statistics) ,Structure (category theory) ,Structural engineering ,Mechanics ,Deformation (meteorology) ,Plateau (mathematics) ,Finite element method ,Stress (mechanics) ,Empirical formula ,business - Abstract
The finite element methodology is conceived to obtain the mechanical parameters about dynamic performance of multilayer A-type U-shaped corrugated structure materials under the in-plane crushing loadings with various impact velocities. A simplified energy absorption model is proposed to evaluate the energy-absorption performance. The evaluation model shows that the optimal energy absorption per unit volume is mainly determined by the dynamic plateau stress. The homogeneous deformation mode, transition deformation mode and dynamic deformation mode are gradually observed with the increasing impact velocities. These three different deformation modes are presented in detail. The in-plane dynamic plateau stress depends on the impact velocity for the multilayer A-type U-shaped corrugated structure materials with a given fixed cell wall thickness. From the physical analysis and discussion of the numerical results, the empirical formula of dynamic plateau stress is suggested in terms of impact velocity.
- Published
- 2012
39. Dynamics Modeling for Satellite Antenna Dish Stabilized Platform
- Author
-
Ramzi Fraga, Said Leghmizi, Adel Boughelala, and Sheng Liu
- Subjects
Engineering ,Torque motor ,business.industry ,Core component ,media_common.quotation_subject ,Dynamics (mechanics) ,General Engineering ,PID controller ,Control engineering ,Inertia ,Control theory ,Satellite antennas ,Antenna (radio) ,business ,Servo ,media_common - Abstract
The system for stabilizing platform of a ship carried antenna and its core component are discussed in this paper. Relevant mathematics model of these components are established. Thus, the dynamic model of the system is deduced including the effects of friction, inertia, and torque motors. Using Solid Works, we built the mechanical structure, including the servo machine of each part of the system. Then a simulation on Simulink of a simplified dynamics model of the stabilized platform was established. After that the classical PID controller has been designed and used for the stabilization system. From the simulation results, the behavior of this simplified model, and the advantages and drawbacks of this method are apparently displayed. 3D structure and simulation results are represented in this paper.
- Published
- 2012
40. Modeling of Multiteeth Contact Meshing Gear Dynamics with Backlash and Coincidence Degree
- Author
-
Zhen Xu, Qi Wang, and Hua Deng
- Subjects
Engineering ,Inertial frame of reference ,Degree (graph theory) ,business.industry ,Dynamics (mechanics) ,General Engineering ,Mechanical engineering ,Physics::Classical Physics ,Coincidence ,Finite element method ,Computer Science::Robotics ,Computer Science::Graphics ,Software ,Contact dynamics ,business ,Backlash ,Simulation - Abstract
In the present paper, a multiteeth meshing gear contact dynamics model is proposed by introducing a modified robotic contact model. The inertial property, backlash of gear teeth and coincidence degree of gear meshing are considered into the model. In addition, the proposed model is used to simulate discontinuous meshing gear contact. Simultaneously, the gear meshing contact dynamical finite element model is also simulated using the Ansys/LS-DYNA software to demonstrate the rationality of the proposed model.
- Published
- 2012
41. Alternating Stress Dynamics Analysis of Harmonic Gear Flexible Wheel
- Author
-
Ming Li, Yang Bai, Xue Feng Han, and Hong Guang Jia
- Subjects
Stress (mechanics) ,Engineering ,Cyclic stress ,Software ,business.industry ,Coincident ,Gear drive ,Dynamics (mechanics) ,General Engineering ,Harmonic ,Process (computing) ,Structural engineering ,business - Abstract
This article is the study of alternating stress of flexible wheel in harmonic gear drive system. Firstly, according to elasticity theory to theoretically analyze flexible wheel stress; then, based on the basic principle of sub-structure modal synthesis method , use the software of UG、PATRAN and ADAMS to carry out co-simulation; Finally, based on the dynamics simulation, to analyze the alternating stress simulation results of flexible wheel and compare theoretical results and simulation results to come conclusion. The results show that: altering stress simulation results of flexible wheel are coincident with theoretical simulation results, have a deeper understand the stress change trend in the drive process of flexible wheel, lay a foundation for further carrying out dynamics simulation of harmonic gear drive system.
- Published
- 2012
42. The Dynamics Analysis of a Multi-Stage Hybrid Planetary Gearing
- Author
-
Xin Tan, Yao Li, and Jun Jie Yang
- Subjects
Engineering ,Brick ,business.industry ,Dynamics (mechanics) ,General Engineering ,Mechanical engineering ,Stiffness ,Physics::Classical Physics ,Finite element method ,Computer Science::Robotics ,Vibration ,Multi stage ,Software ,Gear tooth ,medicine ,medicine.symptom ,business - Abstract
This paper introduces a complex multi-body dynamics model which is established to simulate the dynamic behaviors of a multi-stage hybrid planetary gearing based on the finite element method and the software ADAMS. The finite element method is used to introduce deformable ring-gears and sun-gears by using 3D brick units. A whole multi-body dynamics model is established in the software ADAMS. Mesh stiffness variation excitation and gear tooth contact loss are intrinsically considered. A rich spectrum of dynamic phenomena is shown in the multi-stage hybrid planetary gearing. The results show that the static strength of main parts of the gearing is strong enough and the main vibration and noises are excited by the dynamic mesh forces acting on the tooth of planet-gears and ring-gears.
- Published
- 2012
43. Study of Torsion Spring’s Parameters with Angular Type Grippers
- Author
-
Yoon-Gu Kim, Choong Pyo Jeong, Dong-Hwan Shin, Tae Sang Park, and Ji Nung An
- Subjects
musculoskeletal diseases ,Engineering ,Normal force ,business.industry ,Dynamics (mechanics) ,General Engineering ,Mechanics ,Clamping ,Torsion spring ,body regions ,Computer Science::Robotics ,Classical mechanics ,Prismatic joint ,Position (vector) ,Grippers ,business ,Joint (geology) - Abstract
Angular type grippers are proper to grip the small size material than linear type grippers (clamping). It is due to the grip force of angular type grippers separates to the normal and the opposite directional force to gravity forces, when the contact between the gripper tip and the gripped material occurs. Whereas, the linear type gripper with prismatic joint has only normal forces. Therefore, even less gripping force of angular type grippers than linear type can generate slip-less pick-and-place motions. But this angular type gripper has some restrictions. For generating the opposite direction force to gravity forces, it is necessary that the length between each angular joint position is larger than the length of gripped materials. This should be considered on the design step of angular type grippers. Otherwise, the gripping force separates to the normal and the same directional force to gravity forces. The other restriction is that the tip of gripper must have passive joint or active joint for the plane-to-plane contact between faces of gripped material and gripper tip, for getting the high frictional coefficient. In this paper, we describe the case of adaptation of passive joint. This leads simpler implementation than the active joint. Especially, we focus on the torsional spring deposed at between jaw link and tip as the passive joint, with effects of design parameters of this torsional spring such as the torsional stiffness and preload with multi-body dynamics simulation.
- Published
- 2012
44. Study on Engine Kinematics and Dynamics Simulation Based on COSMOSMotion
- Author
-
Xiao Xu Liu, Ai Hua Tang, and Min Chen
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Kinematics ,business ,Simulation based ,Simulation - Abstract
The engine model with 4 cylinders is built by SolidWorks, the kinematics and dynamics simulations of the engine virtual prototype are done by COSMOSMotion, the results of kinematics simulation are checked, there are very small errors between the simulation results and the calculation results according to formulas. The mainly results of dynamics simulation are given. The simulation result consists with the parameters of the engine.
- Published
- 2012
45. Dynamic Modeling and Motion Simulation of a Movable-Winged Underwater Glider
- Author
-
Zhaoyong Mao, Wen Long Tian, and Baowei Song
- Subjects
Engineering ,Buoyancy ,Motion simulation ,business.industry ,Underwater glider ,Dynamics (mechanics) ,General Engineering ,engineering.material ,System dynamics ,symbols.namesake ,Euler's formula ,symbols ,Aerospace engineering ,Underwater ,business ,Added mass ,Marine engineering - Abstract
Underwater gliders are a class of Autonomous Underwater Vehicles (AUVs) that offer many advantages over traditional AUVs. Previous research has mainly focused on underwater gliders with fixed wings. This paper studied a novel underwater glider whose wings can pitch independently about its installed shaft, called Movable-Winged Underwater Glider (MWUG). A 6-DOF model of dynamics for MWUG was developed based on Newton’s law and Euler’s equation, gravity, buoyancy, added mass forces and hydrodynamic forces considered. Longitudinal motion simulations were conducted to clarify the motion characteristics of MWUG. Results of the simulations indicated that compared to fix-winged gliders, MWUGs show a smaller glide angle and attack angle, higher glide speed and efficiency
- Published
- 2012
46. Mechanical Design and Dynamics Analysis on a Jumping Robot
- Author
-
Yi Li Zheng, Jiang Ming Kan, and Jin Hao Liu
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Thrust ,medicine.disease_cause ,Motion (physics) ,Computer Science::Robotics ,Jumping ,Control theory ,Mechanical design ,medicine ,Virtual work ,business ,Simulation ,Jumping robot - Abstract
Aiming at the forest and wetland environment exploration mission, the mechanical structure and motion characteristic of a four-legs jumping robot are given particularly. Using the principle of virtual work states, the simplified dynamic model of one jumping leg is derived under some assumptions, and the relationship between the jumping height and thrust force of the leg is given and simulated. The simulation result have demonstrated the feasibility and validity of the theoretical analysis for the jumping robot.
- Published
- 2012
47. Parameters Estimation and Dynamics Control of Chay Model Using UKF
- Author
-
Hong Li Li, Jiang Wang, Xi Le Wei, Hai Yang Wang, and Ying Yuan Chen
- Subjects
Engineering ,Quantitative Biology::Neurons and Cognition ,Series (mathematics) ,Estimation theory ,Control vector ,Control theory ,business.industry ,Control (management) ,Dynamics (mechanics) ,General Engineering ,Chaotic ,Biological neuron model ,business - Abstract
This paper describes a control framework that uses UKF to estimate unknown parameters, which has significant physiological functions in neuron model, from heavily noisecorrupted time series of active potential and choose the estimated parameters as control vector enables the control purposes of firing patterns transition. We apply this control strategy to the firing patterns from chaotic spiking to periodic one in the Chay model. It has been demonstrated that this framework is highefficiency and wide potential applications to various system in biology.
- Published
- 2012
48. Lateral Dynamics of Three-Axle Steering Vehicle Based Zero Vehicle Sideslip Angle Control
- Author
-
Pei Feng Feng, Yun Chao Wang, and Yao Xu Li
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Zero (complex analysis) ,Stability (probability) ,Automotive engineering ,Axle ,Control theory ,Transient (oscillation) ,Transient response ,Torque steering ,business ,MATLAB ,computer ,computer.programming_language - Abstract
Based on the established linear 2-DOF dynamics model of three-axle steering vehicle, the relationships between the gain of main transient and steady-state characteristic parameters of three-axle steering vehicle based on Zero Vehicle Sideslip Angle Control (ZVSC), vehicle speed and the deviation of the instantaneous steering center are deduced, and the influences of the control method and system inherent characteristics on steering transient response and stability are discussed. The main characteristic parameters of all wheels steering vehicles and front wheels steering vehicles are compared by quantative analysis using MATLAB with the consistency with theoretical analysis proofed.
- Published
- 2012
49. Dynamics Simulation of Rover Locomotion over Lunar Craters
- Author
-
You Sheng Xu, Jin Song Bao, and Wei Dong Huang
- Subjects
Lunar craters ,business.industry ,Component (UML) ,Dynamics (mechanics) ,General Engineering ,Terrain ,Simulation system ,Aerospace engineering ,business ,Geology ,Visualization ,Remote sensing - Abstract
Rover dynamics simulation is an essential component of its 3-D visualization platform. Here we present a Bekker theory-based rover soft-soil dynamics model to accurately reflect the wheel-ground interaction as the rover navigates on the lunar surface. A rover dynamics model was then established using the multi-body dynamics simulation system, Vortex, with an integrated soft-soil dynamics computing module, to carry out whole vehicle simulation, which revealed the kinetics features of rover locomotion in the complex lunar terrain.
- Published
- 2012
50. The Dynamics Analysis on a Type Palletizing Robot
- Author
-
Su Xia Zhu, Jin Quan Li, and Quan Sheng Lei
- Subjects
Engineering ,business.industry ,Dynamics (mechanics) ,General Engineering ,Control engineering ,Variation (game tree) ,Robot control ,Fictitious force ,Key (cryptography) ,Robot ,MATLAB ,business ,computer ,Statics ,computer.programming_language - Abstract
Based on a palletizing robot, its kineto-static model is created via d'alembert's principle and dynamic statics method. The force of key components with its posture change will be obtained by use of the Matlab. This model is applicable to dynamic analysis on the robots with similar configuration and the results based on the parameter variation is also applicable to this kind of robot’s design, checking and kinetic control.
- Published
- 2012
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