液压自由活塞发动机工作过程仿真模型研究

摘要

为建立单活塞液压自由活塞发动机工作过程仿真模型,根据单活塞液压自由活塞发动机的系统特征,基于热力学、液压流体力学和动力学基本理论,给出了单活塞液压自由活塞发动机稳态工况工作过程的数学描述,并对结果进行了试验验证.结果表明:给出的考虑了液压系统构件动态特性影响的单活塞液压自由活塞发动机仿真模型,在活塞动力学特征、气缸气体压力特征和液压腔压力特征上具有较高的仿真精度.模型适合于单活塞液压自由活塞发动机系统参数确定、优化以及系统工作特征的模拟.%To establish working process simulation model of a single piston hydraulic free-piston engine,its basic feature is presented. Based on the theories of thermodynamics, hydromechanics and dynamics,its mathematical representations for the steady state working process are investigated. The simulation results are verified experimentally. The results show that the mathematical model considered the mechanical components dynamics of the hydraulic system achieves high precision. The simulated piston dynamics,cylinder gas pressure and hydraulic pressures are reliable. The model is propitious for the parameter design and optimization of the engine.