Search

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Drainage & Irrigation Machinery Engineering / Paiguan Jixie Gongcheng Xuebao is the property of Editorial Department of Drainage & Irrigation Machinery Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The cutterhead is one of the core components of the shield machine, and reasonable cutterhead structural design is the foundation for safe and efficient excavation. In order to quickly and efficiently establish the finite element model of the cutterhead and then analyze its mechanical properties, a parameterized modeling method based on the ANSYS parametric design language (APDL) command flow was adopted to establish a digital model of a certain type of composite shield machine cutterhead. By applying the ultimate thrust and torque to the cutterhead, the stress and deformation distributions were obtained through a finite element analysis, and the positions where experience maximum stress and displacement were identified. In doing so, the strength and stiffness conditions were validated as well. In addition, a parameterized modeling based optimization method for cutterheads was established by incorporating with the overall mass of the cutterhead as the optimization objective and the strength and stiffness of as constraints, and the corresponding optimization process was proposed. The optimization parameters of the cutterhead were determined through parameter sensitivity analysis, and the influence of relevant parameters on the strength and stiffness of the cutterhead was explored. The key parameters of the composite shield machine cutterhead studied were optimized. After optimization, the maximum stress of the cutterhead, the maximum deformation and the total weight were reduced by 12%, 20%, and 119 kg, respectively. As a result, the proposed optimization method based on parameterized modeling can improve the strength and stiffness of the cutterhead while reducing the quality of the cutterhead. The research results can shed light on the optimization of multi-objective cutterhead structure. [ABSTRACT FROM AUTHOR]

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Automobile Technology & Material is the property of Automobile Technology & Material Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To address the problem of undesirable prediction accuracy of a deep echo state network caused by redundant structures in the reservoirs, a pruning algorithm for the deep echo state network based on detrended multiple cross-correlation was proposed. Firstly, according to the detrended covariance function and the detrended variance function, the detrended cross-correlation coefficient between each two neurons in the selected reservoirs in turn was calculated, and the detrended cross-correlation matrix was constructed. Based on this matrix, the detrended multiple cross-correlation between a selected neuron and all remaining neurons in this reservoir could be evaluated. Subsequently, the connections from the highly correlated neurons in each reservoir to the output layer were pruned sequentially, thus removing redundant components in the network. Finally, the network after pruning was retrained by least squares regression to obtain the optimal deep echo state network topology. Simulation results showed that the prediction accuracy and memory capacity of the deep echo state network optimized by the proposed algorithm on Mackey-Glass time series were improved by 89. 80% and 30. 93%, respectively, and on Call time series by 14.34% and 0.10%, respectively. [ABSTRACT FROM AUTHOR]

The use of mulch has brought great convenience to agricultural development, but at the same time, it can cause extremely serious white pollution, and there is a lack of relevant degradation treatment research. Low-temperature plasma degradation is a highly efficient and green treatment technology that degrades pollutants by generating high-energy electrons and active substances in the reaction space. Firstly, a high frequency alternating current needle plate corona discharge structure was used to optimize the design for the electrode structure. Then, the plastic film was treated by corona plasma degradation technology, and finally the effects of different discharge power, air humidity, needle film spacing and discharge spacing on the degradation of plastic film were compared. Then, the plastic film was treated by corona plasma degradation technology, and finally the effects of different discharge power, air humidity, needle film spacing and discharge spacing on the degradation of plastic film were compared. The results show that the shape and distance of the needle tip will affect the electron density and electric field intensity to different degrees, and when the slope of the needle tip is 3. 33 and the spacing between the needles is 12 mm, the electron density and electric field intensity are the largest, which are 1. 55 × 10 13m - 3 and 1. 2 × 10 6 V/ m, respectively. The increase of the discharge power will lead to the increase of the energy density in the space, thus increasing the energetic particles in the space When the input power is 64 W, the degradation efficiency is up to 0. 96 %, but the energy efficiency will increase first and then decrease with the increase of input power. When the input power is 56 W, the optimal energy efficiency is 34. 29 μg / (W·h). The increase of the air humidity not only leads to the change of the discharge form and the appearance of stable micro-discharge, but also affects the content of the active material, leading to the degradation of the film. The distance between the ground film and the tip of the needle will also lead to stable micro-discharge, which will increase the degradation efficiency from 0. 43% to 1. 02% . In addition, the distance between the electrodes of the needle plate will also have an impact on the degradation efficiency, when the distance between the discharge is 15 mm can meet both the radiation range and radiation intensity of the plasma, the degradation efficiency and energy efficiency will reach the maximum, which are 2. 3% and 68. 18 μg / (W·h), respectively. [ABSTRACT FROM AUTHOR]

Copyright of Chemical Engineering (China) / Huaxue Gongcheng is the property of Hualu Engineering Science & Technology Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Ordnance Equipment Engineering is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] To study the effects of structure optimization on the contents of total phenols, total flavonoids, carotenoids and aroma components in different parts of tobacco leaves, and to seek a tobacco planting optimization technology that can effectively improve tobacco quality, so as to provide certain theoretical and technical basis for improving tobacco aroma quality and cigarette quality. [Method] Tobacco leaf was used as material in the planting base for structural optimization treatment (the bottom 3 pieces and the top 3 pieces of tobacco were removed), and the effects of structural optimization treatment on the contents of total phenols, total flavonoids, carotenoids and aroma components in different parts of tobacco leaf were analyzed and evaluated. [Result] Structural optimization treatment increased the total phenolic and flavonoid contents in tobacco leaves. After structural optimization treatment, the total phenolic content in tobacco leaves at 6,8,12 and 14 positions was increased by 30.00%, 21.70%, 13.10% and 5.00%, respectively, compared with the control, and the total flavonoid content in tobacco leaves at 4,10 and 12 positions was also significantly higher than that of the control. A total of 22 main volatile substances were detected by SPME-GC-MS, and the structure optimization treatment effectively increased the carotenoid content in tobacco leaves. The contents of aroma substances synthesized from carotenoids as precursors were all affected by the structure optimization treatment. And the influence degree of different leaf position is different. [Conclusion] Structure optimization treatment can effectively increase the contents of total phenol, total flavone and carotenoid in cured tobacco leaves of different leaf positions, improve the quality of tobacco leaves, and significantly increase the content of aroma components, which provides a certain theoretical and technical basis for improving the aroma quality of tobacco and cigarette quality. [ABSTRACT FROM AUTHOR]

The holding pole is a special lifting device for the construction of transmission towers. The optimization design model for the holding pole was established. The minimum mass was set as the optimization objective. The cross-section sizes of members, the connection modes of auxiliary members and the coordinates of the rocker joint were set the optimization variables. The allowable stress, displacement and buckling coefficient were taken as the constraining conditions. An improved sine cosine algorithm (ISCA) was proposed to carry out the size, shape and topology optimization designs of the holding pole. For the ISCA, the Lévy flight was introduced to enhance the global search ability, elite guidance strategy was applied to enhance the local search ability, and the greedy selection strategy was used to update the optimal solution. The example shows that, the ISCA can effectively solve the optimization design problems of spatial truss structures. [ABSTRACT FROM AUTHOR]

Copyright of China Plastics / Zhongguo Suliao is the property of Journal Office of CHINA PLASTICS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electronic Components & Materials is the property of Electronic Components & Materials and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical Strength / Jixie Qiangdu is the property of Zhengzhou Research Institute of Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Gradient stiffened plates are widely used in aerospace, automotive, transportation and other fields for their excellent performance. Aiming at the gradient structure of gradient plate which leads to the problem of excessive computation and low efficiency of homogenization and two-scale optimization design, this paper adopts a machine learning method to build an artificial neural network with microstructure deformation parameters as input and equivalent stiffness coefficients as output, to realize the efficient prediction of equivalent stiffness. In the optimization process, this paper introduces unit design variables characterizing the deformation of the single cell to achieve explicit control of the local deformation of the gradient plate, and introduces mapping function node design variables to ensure that the local deformation of the single cell during the optimization process is consistent with the mapping function, which facilitates the decoupling of the twoscale optimization results. Numerical examples verify the effectiveness and correctness of the proposed method. [ABSTRACT FROM AUTHOR]

ObjectiveIn order to determine the strength of the special deck structure of a cruise ship, this study investigates the ultimate bearing capacity of an unconventional stepped deck used in the layout of the cruise theater.MethodsBased on the quasi-static ABAQUS method, the ultimate bearing capacity of a stepped deck is calculated and the weak positions of the structure are determined and compared with conventional deck failure modes. Meanwhile, the influence of the deck, longitudinal frame, girder web and girder panel thickness on the ultimate bearing capacity of the structure are investigated, and two structural optimization ideas are proposed: pillar reinforcement and longitudinal reinforcement.Results The results show that the failure of the stepped deck mainly occurs at the boundary of the layer with the largest height difference; the ultimate bearing capacity of the stepped deck decreases significantly compared with that of a conventional deck; and the corresponding compression displacement and collapse depth increase obviously. The ultimate bearing capacity increases with the thickness of the deck, longitudinal frame, girder web and girder panels, and the improvement effect of girder web thickness is the most significant. The ultimate bearing capacity of the structure can be effectively improved by adding struts or increasing the height of the web in the weak position of the structure.ConclusionThis study has great significance for the design and optimization of special decks for modern cruise ships.

BackgroundThe passive cooling system for the reactor cavity of the molten salt reactor (MSR) is an important guarantee to ensure the safe operation of the reactor, is one of the four engineered safety features for the MSR, and its structure design is an important part of the thermal hydraulic design.PurposeThis study aims to find out a suitable passive reactor cavity cooling system (RCCS) to meet the requirements of thermal shielding design for the lower reactor cavity of the MSR, and maximize the removal of reactor core decay heat under accident conditions.MethodsFirstly, based on the design parameters of a 153 MWt MSR, a 1/4 geometric model of the lower reactor cabin of this MSR was established. Then, ANSYS FLUENT 20.1 software was employed to conduct three-dimensional numerical simulation of the flow filed and temperature filed for the lower reactor cabin, the influence of thermal shielding of the lower cavity was analyzed by changing the structure and layout of the passive RCCS, the structure sizes of the passive RCCS with double channel, the thickness of thermal insulation cotton on the intermediate thermal shielding plate and the position of the air inlet pipe. Finally, a new and suitable structure of passive RCCS was proposed after step-by-step improvements for a 153 MWt MSR.ResultsThe simulation results show that the optimized new-style passive air-cooling system with a double channel in the lower reactor cavity is the best among the three structures. Changing the width of the RCCS has little effect on the thermal shielding results of the lower reactor cabin whilst increasing the thickness of thermal insulation cotton on the intermediate thermal shielding plate of the RCCS can significantly reduce the temperature of the inner surface of the concrete wall. The closer the inlet position of the air inlet pipe is to the top of the RCCS, the better the thermal shielding effect. Based on above results, a new-style passive air-cooling system with double channel in the lower cavity is designed to completely dsatisfy the requirements for shielding cooling for the lower reactor cavity of a 153 MWt MSR.ConclusionsThe results of this study provide an important reference for the further engineering optimization design of passive residual heat removal system in the hundred megawatt-scale molten salt reactor.

Aiming at the complexity and uncertainty of design variables of automotive front cabin cooling system, Chebyshev uncertainty analysis was applied to optimization design of front cabin cooling flow field to establish a model for reliability optimization for automotive front cabin cooling flow field range. Taking the front cabin cooling system of a car as an example, Chebyshev function was used to optimize the structure design. Selecting the average flow velocity and airflow volume of the cooler and radiator as the target thresholds, this article adopted k- ε turbulence model reliability for finite element analysis and analyzed iteration combined with Chebyshev reliability, to optimize the structure of the front cabin cooling module and improve the performance of the front cabin cooling flow field. The experimental results show that the performance of front cabin cooling flow field can be improved to some extent by increasing the front energy retaining foam section and optimizing the gap between the fan blade and the bracket. [ABSTRACT FROM AUTHOR]

A frustum of a cone for dimethyl ether (DME) steam reforming hydrogen production was designed, and the numerical model of DME steam reforming hydrogen production reaction system was established. The numerical model was solved by COMSOL software, the numerical results of simulation and experiment were basically consistent. By optimizing the structure of the reforming reactor, higher DME conversion rate was obtained. The influence of the cone change on the reforming reaction, and the influence of reaction conditions on DME conversion and hydrogen production were analyzed. The results showed that higher hydrogen yield and thermal efficiency can be obtained When increasing the taper within a certain range. Through structural optimization, the DME steam reforming reaction system can obtain 92.21% DME conversion and 90.54% hydrogen production rate. The highest thermal efficiency is 74.6%. [ABSTRACT FROM AUTHOR]

The impact of different fin pitches on the heat transfer rate and heat storage capacity of fin-tube solid-liquid phase change heat storage units was investigated. Numerical simulations and experimental data were used to analyze four fin-tube phase change heat storage units with different spacing. Two groups of fin spacing models were selected to examine the effect of heating operation parameters on the heat storage characteristics. The results show that the model with the minimum fin pitch had a shorter entire melting time by 79. 57% and a lower heat storage capacity by 13. 31% compared to the model with the maximum fin pitch under the working temperature zone of the heat pump. The inlet water temperature increases, the melting time of the phase change material decreases, and the heat storage capacity increases. Compared to an inlet water temperature of 55 ℃, the melting time of the two models with an inlet water temperature of 70 ℃ was reduced by 64. 45% and 65. 77%, respectively, while the heat storage capacity increases by 17. 27% and 19. 35%, respectively. The melting of the phase change material was promoted by elevating the inlet mass flow. The whole melting time of the two models increases by 11. 54% and 8. 17% under the conditions of the maximum and minimum inlet mass flow. The heat storage capacity increased by 8. 10% and 16. 59% in 8 h. It was observed that exceeding this threshold inlet mass flow has only a minimal effect on the heat storage capacity. It is evident that decreasing the fin spacing not only reduces the heat storage capacity but also significantly increases the cost of the heat storage unit. Therefore, if the heat storage time is sufficient, a wider fin spacing can be considered to reduce the cost of the heat exchanger. [ABSTRACT FROM AUTHOR]

This paper presents a design of an asymmetric metal cross unit structure, which consists of two perpendicular coplanar gold bars deposited on a quartz substrate. The conventional metal cross structure commonly suffers from significant radiation losses in LC resonance and dipole resonance, limiting the achievement of high quality factor and high transmittance in metasurface sensors. By breaking the symmetry of the traditional metal cross structure and introducing a Fano-like resonance effect, the transmission peak sensitivity of 218 GHz / RIU and the quality factor of 78. 3 are achieved. The physical mechanism of the Fano resonance effect is explored by analyzing the electric field and surface current distribution of the metasurface. Furthermore, the influence of structural parameters on the transmission spectrum of the terahertz sensor is investigated, and the sensing performance of the sensor is optimized by adjusting the structural parameters. Finally, asymmetric metal cross terahertz sensors with different resonance frequencies are designed for the detection of various types of trace amino acid solutions in subsequent applications. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Engineering for Thermal Energy & Power / Reneng Dongli Gongcheng is the property of Journal of Engineering for Thermal Energy & Power and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Increasing the fatigue life of the laminated coupling helps to enhance the working stability of the transmission system. To this end, this study establishes a quasi-static mechanical analysis model of the laminated coupling under the action of external torque, and grasps the stress change law of the dangerous part of the lamination. The fatigue life of the laminated sheet is obtained using the S-N curve method. Response surface models of spacer thickness, inclination angle and excess with respect to fatigue life of the laminations are developed by the Box Behnken method. Finally, a study on the optimization of the structure-process parameters of the coupling is carried out. The results show that when the intermediate shaft thickness is 14 mm, the inclination angle is 85.75°, the excess amount is 0.126 mm, and the fatigue life of the coupling is increased by 15.0% compared with the original structure, which ensures the stability and reliability of the shaft system.

“Carbon Peak” and “carbon neutrality” are a social revolution affecting all mankind. How to accurately predict and reduce carbon emissions is the key to the success of this revolution, and also gives the research on this topic a more difficult mission. In order to accurately predict the carbon emissions in the energy sector, based on the energy security considerations such as power balance, power amount balance and peak balancing, a hybrid calculation model is adopted to optimize the installed structure of electric power and energy consumption structure in the process of carbon emission prediction, so as to obtain the optimal minimum carbon emission value based on the installed cost of electric power and the cost of energy consumption structure according to the optimized energy consumption structure. The whole forecasting process is mainly divided into three parts. Firstly, the influencing factors of carbon emissions in the energy sector are analyzed according to the LMDI decomposition method. GDP has a positive driving effect on carbon emissions, while energy consumption intensity and industrial structure have a negative driving effect on carbon emissions. Secondly, the structure of the carbon system is preliminarily optimized and the initial carbon emission value is predicted based on the preliminary optimization results. Finally, based on the rationality and accuracy of the process, a model evaluation method is proposed. The key index verification method is adopted to perform feedback verification on the binding indicators such as the proportion of electric energy in terminal energy consumption, the proportion of non-fossil energy consumption and the cumulative decline rate of carbon intensity in the prediction process. After the key index verification and multiple feedback adjustment, the carbon emission value meeting the constraints of the multi-objective function and each constraint index is obtained. The feasibility and reliability of the optimization and prediction process are verified by using the actual data of a province in central China. The results show that only in the peak reaching scenario, the province can meet the target of carbon peak and pass the verification of three key indicators.

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Power is the property of Electric Power Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Power Generation Technology is the property of Power Generation Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The relaxation and jumping from slot of the power rope of the antenna deployment mechanism are likely to occur in the process of antenna deployment and folding. The deployment mechanism of the high precision satellite umbrella antenna is taken as the research object, and the working principle of the antenna deployment mechanism is analyzed. The equation of motion of the deployment mechanism is obtained by analytical method. Combined with the structural parameters of the parts of the antenna deployment mechanism, the relaxation law of the power rope of the deployment mechanism is obtained. Taking the structural parameters of the deployment mechanism as the design variable and minimum relaxation of the power rope as the goal, the structure optimization model of the deployment mechanism is obtained. The structural parameters of the optimized deployment mechanism are obtained by simulated annealing algorithm. The relaxation and receiving functions of the antenna deployment mechanism before and after optimization are performed with experiment, and the relaxation variable of the power rope is tested when the mechanism is working. The results show that the relaxation variable of the power rope of the optimized deployment mechanism is reduced by 90% compared with that before optimization, and the optimization effect is remarkable.

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Wool Textile Journal is the property of National Wool Textile Science & Technology Information Center and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Ordnance Equipment Engineering is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical Strength / Jixie Qiangdu is the property of Zhengzhou Research Institute of Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Standard Design is the property of Railway Standard Design Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Refrigeration is the property of Journal of Refrigeration Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Refrigeration Technology is the property of Shanghai Society of Refrigeration and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The cycloid gear is the key component of the RV reducer, and the hole structure of the cycloid gear has a great influence on the transmission stability of the of the RV reducer. Based on the meshing contact analysis between the cycloid gear and pin of transmission system, the number of actual meshing teeth pairs of the cycloid gear were obtained. The meshing angle of each tooth pair and the comprehensive meshing stiffness were calculated. Taking the comprehensive meshing stiffness as elastic constraint condition in finite element software, the dynamics harmonic resonance analysis of cycloid gear was carried out. The position of maximum vibration and deformation is located at the fan-shaped lightening hole of cycloid gear plate. According to the different shape of fan-shaped holes of cycloid gear, the dynamics simulation was carried out by orthogonal test with three factors and four levels. The results show that the radius of the top and bottom circle of the fan-shaped hole is always the key factor to the vibration of the cycloidal wheel with the increase of rotation speed, while the vibration increases gradually for the radius of the inverted circle, and decreases for the angle between the waist and the waist. The conclusions are helpful for the structure design of cycloid gear wheel.

Fuel atomization plays an important role in premixed combustion of aero-engine. In order to improve the atomization characteristics of an aviation fuel nozzle and optimize its structural parameters, the volume of fluid (VOF) interface capture algorithm and orthogonal experimental design were used to study the influence of internal flow and structural parameters (expansion angle, length of straight section, rise angle of swirl groove, and number of swirl groove) on the atomization characteristics. The results show that the local vortex on the swirl groove affects the fuel flow in the nozzle, and the local pressure loss can be eliminated by changing the structure of the swirl groove inlet. The number of swirl grooves has the most significant effect on Sauter mean diameter (SMD), the expansion angle is the biggest factor affecting the atomization cone angle, there is an optimal swirl groove elevation angle to minimize the oil film thickness, and the length of straight section has relatively little effect on the atomization characteristics. When the expansion angle is 60°, the length of straight section is 0.25 mm, the rising angle of swirl groove is 45°, the number of swirl grooves is 2, and the optimization effect is the best. After optimization, the oil film thickness decreases by 43.68%, the atomization cone angle increases by 3.70%, and the SMD decreases by 14.79%.

Copyright of Packaging & Food Machinery is the property of Packaging & Food Machinery Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Machines & Control / Dianji Yu Kongzhi Xuebao is the property of Electric Machines & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Shenyang Agricultural University is the property of Journal of Shenyang Agricultural University Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)