A free-piston linear-alternator combined with combustion chambers has been examined in many studies. However, only simplified thermodynamic and mechanical models were developed to mimic the actual behavior of the free-piston engine. The purpose of this study is to establish a fully dynamic model that can calculate the energy transformation under the operation of the free-piston engine. The Matlab/Simulink^® model uses non-constant-volume combustion event, the piston transient dynamics, flow, heat losses, and thermodynamics as bridges to connect control volumes. The model successfully captured the behavior and measurements of a GS-34 free-piston engine, based on a thermodynamic calculation calibrated with experimental data. The resulting model is used for a series of parametric studies to understand the very complex system behavior, including low load operation. Operation parameters (injection timing and bounce chamber mass) are optimized to generate the engine map for different alternator sizes. At the end, the advantages of the opposed free-piston engine with a linear alternator are presented through the energy analysis.

许多研究已经检验了与燃烧室相结合的自由活塞线性交流发电机。然而，仅开发了简化的热力学和机械模型来模拟自由活塞发动机的实际行为。本研究的目的是建立一个全动态模型，可以计算自由活塞发动机运行下的能量转换。在MATLAB / Simulink ^®模型使用非恒定体积燃烧事件、活塞瞬态动力学、流量、热损失和热力学作为连接控制体积的桥梁。该模型基于用实验数据校准的热力学计算，成功捕获了 GS-34 自由活塞发动机的行为和测量结果。生成的模型用于一系列参数研究，以了解非常复杂的系统行为，包括低负载运行。优化运行参数（喷射正时和弹跳室质量）以生成不同交流发电机尺寸的发动机图。最后，通过能量分析介绍了带线性交流发电机的对置自由活塞发动机的优点。