阐述了三缸机械液压约束活塞发动机(HCPE)工作原理，建立了系统工作过程的微分方程。

The working principle and structure of 3-cylinder hydraulic confined piston engine (HCPE) is put forward, and the working process differential equations is constructed.

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本文分析了液压约束活塞发动机的结构原理和力学模型，简要介绍了ANSYS的尺寸优化理论。

This paper analyzed the structural theory and the mechanical model of hydraulic piston engine, and briefly introduced the optimization theory of ANSYS.

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