自由活塞发动机工作特性仿真分析

马宗正¹，王赛飞^1,2，唐娟^3,4，张双飞²

1.河南工程学院机械工程学院，河南 郑州  451191；2.中原工学院机电学院，河南 郑州  450007；

3.聊城大学机械与汽车工程学院，山东聊城252059；4.龙口中宇机械有限公司，山东 龙口  256716

摘要：以自由活塞发动机为研究对象，基于MATLAB/Simulink建立仿真模型，分析动子质量和外部负载对自由活塞发动机电磁力、电磁力做功的影响。结果表明：所建立的模型可以初步模拟自由活塞发动机系统动子运动等特征，动子质量要足够大，动子质量小于3.0 kg时该发动机不能正常工作，动子质量大于3.3 kg时，发动机能够正常工作；随动子质量增大，电磁力做功功率呈先增大后下降趋势，动子质量为3.7 kg时电磁力功率最大，为1.42 kW；随外部负载增加，电磁力峰值降低，电磁力做功功率先增大后降低，当外部负载为8 Ω时电磁力功率最大，为2.10 kW。

关键词：自由活塞发动机；运行特性；仿真；动子质量；电磁力

Simulation of operating characteristic of free piston linear engine

MA Zongzheng¹, WANG Saifei¹，2, TANG Juan³，4, ZHANG Shuangfei²

1.School of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, China;

2. School of Mechanical and Electronic Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China;

3. School of Mechanical & Automotive Engineering, Liaocheng University, Liaocheng 252059,China;

4. Longkou Zhongyu Machinery Co., Ltd., Longkou 256716, China

Abstract：For the free piston engine (FPE), a simulation model is established based on MATLAB/Simulink to analyze the influence of the rotor mass and external load on the electromagnetic force and work. The simulation results show that the model can be used to simulate the FPE working process. The FPE can not work when the actuator mass is less than 3 kg which indicates that the actuator mass should be big enough. And the electromagnetic force increases with the actuator mass increasing when the actuator mass is bigger than 3.3 kg. The power of the electromagnetic force reaches the maximum value 1.42 kW when the actuator mass is 3.7 kg. It also shows that the peak value of the electromagnetic force decreases with the external load increasing and the power of the electromagnetic force increases first and then decreases with the external load increasing. And the power of the electromagnetic force reaches the maximum value 2.10 kW when the external load is 8 Ω.

Keywords: free piston engine; operating characteristic; simulation; actuator mass; electromagnetic force