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9th International Symposium on Sensors, Mechatronics, and Automation System, ISSMAS 2023

作者： Cui, Jialu Yang, Xiaohui Han, Bing Jia, Feng Shaanxi Engineering Laboratory for Transmissions and Controls Northwestern Polytechnical University Xi'an710072 China

ISBN: (纸本)9781510672802

A parameterized modeling and spatial layout method for marine parallel shaft gear transmission system is proposed using the idea of parameterized modeling and the characteristics of Open CASCADE technology, combined with the structural parameters of transmission system feature units and the logical relationship of transmission system. Based on the basic structural parameters and topological principles, parameterized models of gears, bearings, couplings, shafts, etc. were designed for typical units of the transmission system. The initial model generation of the transmission system shaft system was achieved. In response to the complexity and diversity of the spatial layout of the transmission system, a set of shaft system spatial layout schemes was summarized to improve the configuration efficiency of the marine transmission system, it has reference significance for the configuration design stage of the transmission system. © 2024 SPIE.

关键词： 3D modeling Modeling Design and modelling Data modeling Systems modeling Visual process modeling

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Application of MoS_(2)in the space environment:a review

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Frontiers of Mechanical engineering 2023年第3期18卷 47-77页

作者： Menghe ZHOU Ruiting TONG Tao ZHANG Geng LIU Shaanxi Engineering Laboratory for Transmissions and Controls Northwestern Polytechnical UniversityXi'an 710072China CALT China Academy of Launch Vehicle TechnologyBejing 100076China

A considerable portion of space mechanism failures are related to space tribological *** welding in high vacuum;surface erosion and collision damage caused by various radiations,high temperature oxidation under atomic oxygen(AO)bombardment;and thermal stress caused by temperature alternation all alter the physical,chemical,and friction properties of *** particular,the space vibration caused by alternating temperatures and microgravity environments can alter the motion of the contact body,further affecting its friction *** the friction properties of contact surfaces in the space environment is an important way to extend the service life of *** lubricants can no longer meet the lubrication requirements of the space *** study describes the characteristics of the space environment and the applications of solid *** friction properties of MoS_(2),a solid lubricant widely used in space,are *** synergistic lubrication of MoS_(2)with surface textures or metals is *** in research on the friction properties of collision sliding contacts in the space environment are *** combination of MoS_(2)and soft metals with surface textures is introduced to reduce the effects of vibration environments on the friction properties of moving parts in space ***,the challenges and future research interests of MoS_(2)films in space tribology are presented.

关键词： MoS_(2) soft metal space environment surface texture synergistic effect vibration

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A Review on Dynamics of Gear Systems with Gravity Effects 3

A Review on Dynamics of Gear Systems with Gravity Effects

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3rd International Conference on Advanced Manufacturing Technology and Electronic Information, AMTEI 2023

作者： Du, Ying Yang, Long Tong, Ruiting Liu, Lan Gong, Jingyi Liu, Geng Shaanxi Engineering Laboratory for Transmissions and Controls Northwestern Polytechnical University Xi'an710072 China No.703 Research Institute of CSSC Harbin150078 China

ISBN: (纸本)9781510674806

Gear systems are extensively implemented in industrial applications such as shipping, wind turbine and aerospace. The performance of the transmission equipment will be directly affected by the dynamic characteristics of the gear system. As the demand for high-power and heavy-load gear transmissions continues to rise, gear systems are inclined to exhibit high volume and weight. It is essential to take gravity effects into consideration during the analysis of gear dynamics, because they will make components of gear systems deform, change the tooth contact status and consequently affect the dynamic response of gear systems. In the past few decades, research on the gear systems dynamics with gravity effects has increased dramatically. This paper provides a comprehensive review of published literatures related to the gear dynamics considering gravity effects. The studies focus on three primary themes: the impact of gravity upon the time-domain dynamic response, the impact of gravity upon the frequency-domain dynamic response, and the impact of gravity upon the gap nonlinear response of gear systems. Finally, some conclusions are summarized. © 2024 SPIE.

关键词： Dynamic response

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Optimal Design and Experimental Verification of Low Radiation Noise of Gearbox

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Chinese Journal of Mechanical engineering 2022年第6期35卷 123-135页

作者： Lan Liu Kun Kang Yingjie Xi Zhengxi Hu Jingyi Gong Geng Liu Shaanxi Engineering Laboratory for Transmissions and Controls School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Xi’an Aerospace Dynamic Test Technology Research Institute Xi’an 710072China

Reducing the radiated noise of a gearbox is a difficult problem in aviation,navigation,machinery,and other *** improvement is the main means of noise reduction for a gearbox,and it is realized primarily through contribution analysis and structure ***,these approaches have certain *** this study,a low-noise design method for a gearbox that combines the two approaches is proposed,and experimental verification is ***,a finite element/boundary element model is established using a single-stage herringbone *** the vibration excitation of the gear system,the radiation noise of a single-stage gearbox is predicted based on the modal acoustic transfer vector(MATV)***,the maximum field point of the radiated noise is determined,and the acoustic transfer vector(ATV)analysis and modal acoustic contribution(MAC)analysis are conducted to determine the region that contributes significantly to the radiated noise of the field *** optimization region is selected through the panel acoustic contribution(PAC)***,to reduce the normal speed in the optimization region,topology optimization is *** to the topology optimization results,four different noise reduction structures are added to the gearbox,and the low-noise optimization models are established ***,by measuring the radiated noise of the gearbox before and after optimization under a given working condition,the validity of the radiated noise prediction method and the low-noise optimization design method are verified by comparing the simulation and experimental data.A comparison of the four optimization models proves that the noise reduction effect can be achieved only by adding a noise reduction structure to the center of the density nephogram.

关键词： Radiated noise prediction Acoustic contribution analysis Topology optimization Noise reduction structures Experimental verification

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Study on Coupling Dynamic Characteristics of Single-Input and Double-Output Transmission System

Study on Coupling Dynamic Characteristics of Single-Input an...

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International Conference on Mechanical Design, ICMD 2021

作者： Shi, Yaomin Wang, Haiwei Liu, Lan Liu, Geng Shaanxi Engineering Laboratory for Transmissions and Controls Northwestern Polytechnical University Xi’an710072 China

ISBN: (纸本)9789811673801

Based on the generalized finite element method, this paper takes the marine combined power transmission system with single main engine input and twin propellers output as the research object and a complete coupled dynamic analysis model is established. The dynamic meshing force of the system is calculated by using the Fourier series method, and the dynamic load characteristics of the system at continuous rotating speed are obtained. What’s more, the reason of the resonance peak and the mutual coupling law of each subsystem under the corresponding resonance speed are analyzed. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Dynamic loads

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Research on Automatic Configuration Modelling of Marine Transmission System 5

Research on Automatic Configuration Modelling of Marine Tran...

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5th International Conference on Mechatronics and Computer Technology engineering, MCTE 2022

作者： Dong, Wentao Yang, XiaoHui Han, Bing Qiang, BaoBao Shaanxi Engineering Laboratory for Transmissions and Controls Northwestern Polytechnical University Xi'an710072 China

ISBN: (纸本)9781510661073

The paper takes marine transmission as the research object, generates the schemes of transmission automatically based on graph theory and maps the selected transmission graph theory model scheme into a more intuitive transmission configuration for subsequent design. The main contents of this article are as follows: Extracting the knowledge from existing Marine transmission data;generating the graph theory models and numbering the vertexes and edges of each model;converting graph-theoretic models into mathematical language for processing by computers;formulating screening rules for graph model schemes;listing the screened graph model solutions and mapping the selected transmission graph theory model scheme into transmission configuration. By using the methods described in this paper, designers can achieve a shortened design cycle for marine transmissions and improve design efficiency. © 2022 SPIE.

关键词： Graph theory

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Analysis of Tooth Profile Influencing Factors and Meshing Characteristics for Trochoidal Roller Pinion Rack transmissions

Analysis of Tooth Profile Influencing Factors and Meshing Ch...

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International Conference on Mechanical Design, ICMD 2021

作者： Si, Shuangshuang Wang, Haiwei Li, Lulu Liu, Geng Shaanxi Engineering Laboratory for Transmissions and Controls Northwestern Polytechnical University Xi’an710072 China

ISBN: (纸本)9789811673801

This paper has taken the trochoidal roller pinion rack transmission as the research object. Firstly, the influencing factors of tooth shape are fitted and the influencing laws are obtained by analyzing the operation results;Secondly, based on the trochoidal tooth profile equations, the curvature and curvature radius equations are derived, the factors influencing the variation of radius of curvature and their influencing rules are obtained, then the root-cutting characteristics are analyzed;Finally, the influencing factors for the meshing characteristics of pressure angle and contact ratio are systematically analyzed by MATLAB. The results show that improving the transmission efficiency can be attained by increasing the number of rollers and reducing the rack profile offset coefficient appropriately;Increasing contact ratio can be achieved by increasing the roller numbers, roller diameter coefficient, addendum height coefficient and reducing tooth profile offset coefficient. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： transmissions

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Principle and Kinematics Analysis of the New Type Planetary Roller and Roller Pinion Compound Transmission Device

Principle and Kinematics Analysis of the New Type Planetary ...

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International Conference on Mechanical Design, ICMD 2021

作者： Li, Lulu Wang, Haiwei Si, Shuangshuang Liu, Geng Shaanxi Engineering Laboratory for Transmissions and Controls Northwestern Polytechnical University Xi’an710072 China

ISBN: (纸本)9789811673801

In this paper, a new type of transmission device, planetary roller and roller pinion compound transmission device (PR&RP), is proposed, which combines planetary roller screw with trochoidal rack and roller pinion. The device not only has the advantages of compact structure and large bearing capacity of planetary roller screw, but also has the advantages of high precision and low noise. The transmission principle of the device is represented and the parameter matching design method of the transmission device is established. The parameter design and three-dimensional modeling of the transmission device are carried out according to the requirements of specific working conditions. The kinematics simulation of the transmission device was completed by using ADAMS software. The result validates the basic transmission principle and design feasibility of the transmission device. The influence laws of some basic design parameters on the motion characteristics are analyzed and summarized. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Screws

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Architecture design of generic automatic test system runtime platform based on ATML 9

Architecture design of generic automatic test system runtime...

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9th International Symposium on Sensors, Mechatronics, and Automation System, ISSMAS 2023

作者： Jia, Feng Yang, Xiaohui Li, Shilin Cui, Jialu Han, Bing Zhang, Guiying Shaanxi Engineering Laboratory for Transmissions and Controls Northwestern Polytechnical University Xi'an710072 China Avic Beijing Changcheng Aeronautical Measurement and Control Technology Research Institute Beijing101111 China

ISBN: (纸本)9781510672802

In this paper, an Automatic Test System runtime platform based on the ATML standard is designed and implemented. Firstly, the paper analyzes functions and internal relationship of the basic components of TPS based on ATML, and gives the parse method of TPS. Afterwards, the overall architecture design and functional division of the runtime platform were carried out. Realize the execution logic of the runtime platform by generating the Test Operation Tree and analyzing the test purpose of different Operation Type. Then, the software execution process during debugging control and simulation test is given, and finally the method of debugging information monitoring and persistence is explained. In addition, this paper introduces the resource allocation methods when calling the underlying test resources. By using the architecture described in this paper, the interchangeability and test efficiency of test programs can be improved. © 2024 SPIE.

关键词： Equipment Design and modelling Control systems Logic Data storage Signal processing Device simulation Switches Virtual reality Automated test equipment

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Analysis of Load Sharing Characteristics of Power Split Planetary Gear Transmission

Analysis of Load Sharing Characteristics of Power Split Plan...

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International Conference on Mechanical Design, ICMD 2021

作者： Liu, Lan Ma, Qiangyi Ren, Pengkai Wu, Fukang Gong, Jingyi Liu, Geng Shaanxi Engineering Laboratory for Transmissions and Controls School of Mechanical Engineering Northwestern Polytechnical University Xi’an710072 China

ISBN: (纸本)9789811673801

According to the structural characteristics of the power split planetary gear transmission system, a torsional-transverse vibration coupling model of the system is established by using lumped mass method. Two internal excitations, i.e., time-varying mesh stiffness and tooth frequency meshing error, are taken into account. Uneven load coefficients of the two-stage gear transmission system under static and dynamic conditions are calculated respectively, and the influence laws of system error, mesh stiffness and support stiffness on the load sharing characteristics of the system are obtained. The research results show that improving the gear accuracy, gear flexibility and support flexibility can improve the load sharing performance of the system. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Stiffness

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