自由活塞内燃发电机稳定运行参数耦合分析

Parameters Coupling Analysis on Stable Operation Process of Free-piston Engine Generator

针对自由活塞内燃发电机较难实现稳定运行的问题,对自由活塞内燃发电机工作过程活塞受力状况进行了分析,结果表明其工作过程可以看成是单自由度有阻尼强迫振动系统。结合工作过程中的能量守恒原理,分析了自由活塞内燃发电机稳定运行过程中结构参数与性能参数之间的耦合关系,通过等效计算,获得了自由活塞内燃发电机稳定工作所需要的匹配参数。并以一样机为例,对分析结果进行了仿真验证,结果表明通过等效计算所确定的匹配参数能够近似实现稳定运行,验证了分析的正确性。

In order to achieve stable operation of the free-piston engine generator, the forces status on the free-piston of the working process were analyzed. The results showed that the operation of the free-piston engine generator could be seen as a single degree of freedom damping system with forced excitations. Combining the energy conservation principle of the working process, the matching between the structure parameters and the performance parameters of free-piston engine generator was studied. Some necessary qualifications to achieve stable operation of the free-piston engine generator were obtained through coupling analysis calculation by using an energy equilibrium method. The analysis conclusion was validated on a prototype by simulation. The results showed that the movement of free-piston could reach stable operation approximately, and the coupling analysis method proposed was reasonable.