自由活塞直线发电机总体参数设计方法

Structural Parameters Matching Design for Free-Piston Linear Alternator

为获得自由活塞直线发电机总体参数的设计方法,基于发电机工作特点和运行规律,研究了主要结构参数与性能参数之间的匹配关系,包括气缸工作容积与输出功率、最高燃烧压力与气缸工作容积、压缩比与活塞质量及电磁负载与输出功率,由此构建了一种自由活塞直线发电机总体参数匹配模型,进而总结出一种利用振动特性的自由活塞直线发电机总体结构参数设计方法。利用该方法完成了一台原理样机的设计,并通过仿真和试验进行了验证,试验结果表明:仿真和试验的运行频率与设计目标最大误差为13.4%,最高燃烧压力最大误差10.5%,输出功率最大误差为6%,接近设计目标值。

To propose a designing strategy for free-piston linear alternator,the matching relationships between the structural parameters and the performance parameters were analyzed following the moving characteristics of free piston,including the cylinder displacement and output power,the maximum combustion pressure and cylinder displacement,the compression ratio and output power,and the piston mass and electromagnetic load.According to the matching relationships,a designing strategy with total system parameters for free-piston linear alternator was constructed,and the main structural parameters of a test prototype,including piston mass,stroke length,compression ratio,bore and electromagnetic load,were determined.The effectiveness of the designing strategy was verified by simulations and tests of the prototype.It indicates that the maximum error of frequency between the operating observation and designing objective reaches 13.4%,the maximum error of combustion pressure 10.5% and the maximum error of output power 6%.