Search

Hybrid electric technology had been introduced into construction machinery from vehicle field. Hybrid electric bulldozer was focused by researchers recently. For constructing a simulation platform of the series tracked hybrid electric bulldozer on whole working condition, a model was built through the secondary development of ADvanced VehIcle SimulatOR (ADVISOR), which could simulate its performance on straight and steering working conditions. In the modeling process, bulldozer’s dynamics model, track walking mechanism model and oil pump model etc., were established and inserting by Matlab/Simulink. The field experiments were performed. The data from experiments and simulation outputs were compared to validate the correct of the model. The results showed that the operating parameters of model were in close proximity to those of experiments, which verifying the established model had significant high accuracy.

An epipolar line constraint equation for robotic binocolar stereovision (BSV) is first established for the measurement and reconstruction of workpiece surface, in which the intrinsic parameters of two cameras and their extrinsic structural parameters with respect to a robotic reference base are included. To determine a sole matching point between left and right images, a laser emmiter is added to BSV to form a stripe on workpiece surface, experimental results show that the measurement accuracy of 3-dimensional (3-D) workpiece surface can be improved by combining epipolar line constraint with laser stripe projection, and the 3-D workpiece surface can be reconstructed with less errors.

In this paper, A new type of power-split HEV system based on Ravigneaux Planetary Mechanism is introduced. Using AVL Cruise software established the hybrid passenger car simulation model. The energy management system control strategy based rules is also studied. The effectiveness of the control strategy for the vehicle is proved by UDDC driving cycle. According to the results, fuel consumption saving of five percent than that of the prototype.

The air filter in the course of their work will produce large vibration by the excitation source from the engine and other incentives will cause severe vibration response when the excitation frequency and its natural frequency close to shorten the life of the filter. Therefore, during the structural design must be modal analysis, its natural frequency to avoid the excitation frequency. This paper describes the application the HyperWorks right air filter of a particular model the steps of the modal analysis, its natural frequency, and the analysis and evaluation.

Drought is an important factor that affects economic and social development in our province. Therefore, put forward a systematic construction for drought relief ideas and principles, engineering and non-engineering drought relief measures in Guizhou is of important reality and necessity. Thus provides decision-making basis for managers to formulate drought relief measures and reduce the loss caused by drought disasters to a minimum.

On the basis of the analysis of the difficulties in the meteorological measurement, this paper proposes a three resistance measurement method based on the self-correcting technique, through comparing the relative size of the three groups of measuring signal for the desired measuring value. The advantage of this method is to counteract the effects of drift in the measurement circuit, which can achieve high precision results in the bad external environment. This paper gives a comparison of measured data. The method has been verified in practical application.

The Neutron Transport Theory is accurate in reactor engineering analysis, but the calculation process is tedious and complicated. The objective of the present study obtains the thermal utilization factor f by Monte Carlo method. The study establishes the pressurized water reactor model by MCNP program firstly, and calculates the dioxide pellets, zirconium alloy cladding and moderator’s neutron flux density distribution. The thermal neutron disadvantage factor ζ will be gained according to the definition formula. Based on the functional relationship between the above thermal neutron disadvantage factor ζ and the thermal utilization factor f, this study finally obtains the thermal utilization factor f.

This paper describes the design of a temperature and humidity controller, the controller takes P89LPC920FDH SCM as the core. P89LPC920FDH micro-controller integrated with internal comparator, watchdog timer, and reset circuit modules. The main control circuit board uses comparator to detect alternating current zero crossing point, uses the timer after a time delay to thyristor trigger pulse to control the hair AC conduction angle, thereby heating power control circuit to control the temperature and humidity of the environment, the purpose of.

Base on the theory that 222Rn can transport in any medium, fast prediction model of radon concentration in environment air can be acquired. And it has been proved accurate by an experiment in laboratory. Many field tests also showed that the average absolute relative error is 8.78% between mean value of measurement and that of fast prediction. It can be predict fleetly the radon concentration by 226Ra which is acquired from the airborne gamma-ray spectra. The relative error between measurement and model is-11.7%. Therefore, the transport model can be effectively applied to predict radon concentration in environment air.

In this paper, KTA-304 boron steel for low-energy neutron absorption and attenuation is studied by Monte Carlo method, and compared with the traditional SUS304 stainless steel. Taking into account some factors, such as processing conditions, corrosion resistance, hot ductility, etc. we may reasonably come to the conclusion that 1.13% boron concentration in the steel has a better absorption capacity to the low-energy neutron and can effectively reduce the secondary γ-ray effect, meeting the request of radiation protection with reduced material thickness. Besides, low-energy neutron attenuation coefficient was calculated at different boron concentrations of the steel in different energies, providing a reasonable basis for selecting the neutron shielding materials. The γ-rays released in the neutron capture process were considered, too.

Control rods play an important role in nuclear power plant's reactivity control. In this paper, the study first establishes the pressurized water reactor model with Control rods by MCNP program, calculates the reactor keff by KCODE card and neutron flux density by F5:N card. The result shows that when control rods are not inserted, the neutron flux density distribution is similar to the cosine function. The control rods slowly but continuously move up with the reactor's increasing operating time, the neutron flux density peak gradually shifted to the top of reactor core. The simulation results agree with the nuclear fuel management program.

This paper developed a intelligent control system that can fertigate according to crops’ requirements. At first, the overall composition of this system was expounded. It used kingview 6.55 and measurement and control center software as the development platform, and HORNER OCS as the core controller, and it constructed agricultural fertigation control system. The communication module is GPRS DTU, and the system pressure adjustment was achieved by frequency converter. Secondly, related technology such as communication protocol, port mapping, dynamic DNS and peanut shells software was introduced. The system software development, database design and public based on the Internet was completed. The system test results show that the system was fully function, stable running, and met actual demand of water and fertilizer management in agriculture.

A rapid template matching algorithm is used to locate l-emitting d (LED) die array on wafer planes in vision-based LED sorting or die-bonding system, the image of LED die array is first converted to binary image and is pre-processed through morphological operations such as dilation and erosion, and the cross correlation operation between LED die templatae and wafer image in frequency domain is implemented by using fast Fourier transform (FFT), and the pixel coordinates of all LED dies on the wafer plane can be determined at one time using the cross correlation in frequency domain (CCFD) instead of in spacial domain. Experimental results of LED die array measurement to a large-diameter LED wafer show that detection efficiency is far higher than conventional normalized cross-correlation (NCC) algorithm, and is only half of consumed time to compare with the sequential similarity detection algorithm (SSDA), the proposed CCFD algorithm can be used for rapid LED die array location in vision-baesd LED sorting or die-bonding machines.

A robust method based on dual back-propagation neural networks (BPNN) is proposed to recognize light-emitting diode (LED) dies on wafer planes in vision-based LED sorting system. To improve the recognition accuracy of LED dies, particularly under the condition of LED die image degradation, a dual BPNN with 3 layers architecture is first constructed, in which the two BPNNs are trained respectively using the region features and edge features of die images based on batch gradient descent method, and then the outputs of the dual BPNN are fused according to Dempster-Shafer (D-S) theory to generate a final decision. Applying the trained dual BPNN as a classifier, the recognition experiment of a large-diameter LED wafer is completed, experimental results show that LED die recognition accuracy of the dual BPNN is higher than that of the single BPNN based on the region feature or edge feature and is robust to die image degradation, it can be used for LED die array location in vision-baesd LED sorting machines.

This paper illustrated the drought resistance strategy, analyzed the profile, characteristics, development tendency and the cause of the drought in Guizhou Province. And the paper analyzed the major measures and achievements of the drought resistance emphatically to provide a reference basis for Guizhou drought resistance.

With the expansion of the hybrid electric technology, hybrid electric driving system is introduced from hybrid electric vehicle into construction machinery such as bulldozer. Therefore, the corresponding simulation models of hybrid electric bulldozers need to be developed firstly for further study of the new application. In this paper, through analyzing on the characteristics of crawler bulldozers, a whole vehicle module and a crawler module are created, then the relevant configuration files are modified, and finally the simulation model of series hybrid electric crawler bulldozer (SHECB) is built based on ADvanced VehIcle SimulatOR (ADVISOR).After loading an operational driving cycle of the bulldozer, a certain type of hybrid bulldozer being developed is simulated. The results show that the simulation model developed can simulate the performance of the SHECB favorably.

In this paper, the fuzzy controlling system of automatic irrigation was prepared and designed based on MINI2440 and C8051F410 MCU, in which MATLAB was embedded in C8051F410 MCU while WINCE5.0 was embedded in MINI2440. In the progress, the WINCE5.0 was developed by using C#. All the simulate results of fuzzy controller were shown by SIMLINK in the system. In this paper, we proposed a novel control mode and gave the Robust Control Algorithm of the fuzzy Control System.

The bond graph method is used to analyse and model dynamics of hybrid electric system based on Ravigneaux Planetary Mechanism. Bond graph models are built in different structural form, general equations of torque and speed are derived, and operating modes achieved in different structural form are in consideration. At the same time, requirements of control system in different operating modes are illustrated and analysed, which help lay the foundations for modeling and simulation of HEV system based on Ravigneaux Planetary Mechanism.

This article mainly aimed at the Karst slope characteristics, designed a kind of network based on ZigBee irrigation control system. The lower position machine node in this system powered by solar energy, in accordance with the regulation of crop water requirements for irrigation, and synchronously measureed pipe flow of all levels. According to the isosceles triangle(type B)to decorate irrigation points and the diagonal 5 forms to fix the sensor mentioned in this article for crop irrigation experiment, and the pipes flow are measured.

The change of reservoir dam’s piezometric level can reflect the dam’s internal structure, piezometric level number obtained by using detection technology can directly judge the interior defect, therefore, whether piezometric level detection is accurate or not is related to dam’s safety. After years’ research, the design scheme of integrating mechanics and electrics is put forward by combining with today’s popular single chip computer technology and digital measuring technology, which is the scheme that we adopt the digital detection technology to convert the water level into pulse digital signal directly and calculate the piezometric level according to the number of single pulse. It is necessary to develop a Piezometric Tube detector with teatures of high precision, high degree of automation and high speed of processing and acquisiting data and put it into use.

We designed a kind of irrigation control system based on PC and C8051F by ourselves, which was finished by implanting C8051F microcontroller in MATLAB fuzzy logic toolbox to design fuzzy control program and the fuzzy control results were simulated by SIMULINK，PC was planted in WINCE6.0 embedded operation platform, and used C# to develop software, it has the functions of observation and operating database, etc. The system achieved the purpose of fuzzy controlling by using microcontroller technology and embedded technology.