沈文臣,胡宇辉,余天啸,席军强,陈慧岩.气动换挡执行机构压力特性仿真与试验[J].农业机械学报,2016,47(2):338-348.
Shen Wenchen,Hu Yuhui,Yu Tianxiao,Xi Junqiang,Chen Huiyan.Simulation and Experiment of Pressure Characteristics for Pneumatic Shifting Actuator[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(2):338-348.
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气动换挡执行机构压力特性仿真与试验   [下载全文]
Simulation and Experiment of Pressure Characteristics for Pneumatic Shifting Actuator   [Download Pdf][in English]
投稿时间:2015-11-19  
DOI:10.6041/j.issn.1000-1298.2016.02.045
中文关键词:  气动执行机构  动态特性  压力特性  开关阀
基金项目:国家自然科学基金项目(51505029)
作者单位
沈文臣 北京理工大学 
胡宇辉 北京理工大学 
余天啸 北京理工大学 
席军强 北京理工大学 
陈慧岩 北京理工大学 
中文摘要:气动换挡执行机构的响应高度滞后与强非线性特点,给机械自动变速器换挡机构的选型和设计带来难点,常规的稳态分析存在较大误差。针对开关阀控制的气动选换挡执行机构气腔中压力形成特点,建立了综合考虑电、磁、机械和流体传动原理的数学模型来描述气动执行机构的动态耦合特性。通过仿真,对阀控压力腔容积、电磁阀进排气口的有效面积等影响气腔中压力形成特性的因素进行了分析,并通过试验验证了模型的准确性。该模型可直接用于换挡执行机构的参数优化或者自动控制,为解决气动换挡过程中的换挡力控制问题提供基础。
Shen Wenchen  Hu Yuhui  Yu Tianxiao  Xi Junqiang  Chen Huiyan
School of Mechanical Engineering, Beijing Institute of Technology,School of Mechanical Engineering, Beijing Institute of Technology,School of Mechanical Engineering, Beijing Institute of Technology,School of Mechanical Engineering, Beijing Institute of Technology and School of Mechanical Engineering, Beijing Institute of Technology
Key Words:pneumatic shifting actuator  dynamic characteristics  pressure characteristics  on/off valve
Abstract:It brings great difficulties to select structure and design for automated mechanical transmission shifting actuator, because pneumatic shifting actuator has characteristics of highly-lag response and strong nonlinearity, which leads to big errors when only adopting regular steady-state analysis. Focusing on the features of pressure formed in the chamber of a pneumatic shifting actuator controlled by high-speed on/off valves, a nonlinear mathematical model integrated electricity, magnetism, machinery and fluid power theory was built, which was used to describe the dynamic coupling speciality of the pneumatic shifting actuator. In order to evaluate the accuracy of the model, two indexes including average relative error and maximum relative error were adopted. Compared simulated results with practical ones, the small errors showed that the actuator model was reasonable enough to simulate the dynamic characteristics of pneumatic actuator. Through simulation, several factors, such as volume of pressure chamber controlled by electric valves, the effective areas of electric valve inlet and outlet, were analyzed and they had great influence on the buildup of pressure in the chamber. Finally, the model can be directly used to optimize the structural parameters of pneumatic actuator or to validate some complex control algorithms, which is a good platform to solve shifting force control problem during pneumatic shifting process. However, the nonlinear equations of the system are so complex that they will not be able to calculate on a real-time platform unless they are simplified. The further work is to simplify the complex model into a simple one, which will not reduce the dynamic characteristics sharply and can be run on a real-time platform such as DSpace.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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