提出一种基于曲柄双滑块的双级活塞压缩机结构，通过多体动力学和计算流体力学的联合仿真，获得压缩机工作过程中气缸内气体压力的变化曲线，在Adams平台中，将压力载荷施加于压缩机活塞，进行多体动力学仿真和柔性体分析，得到压缩机构件的运动学参数曲线，以及关键部件的应力特性。结果表明:基于曲柄双滑块运动机构的压缩机设计是可行的，曲轴的强度符合材料力学要求;而该结构中曲轴应力比为0.93，更接近静态应力，具有更好的应力特性;往复惯性力造成两对活塞应力差别较大，并对曲轴应力分布有一定影响。

A structure of double-stage compressor with two pistons based on the crank double slider structure is proposed.Variation of air pressure in the compressor's cylinder is obtained through a collaborative simulation based on CFD and multibody dynamics theory.The data of pressure variation is then applied on the two pistons during flexible multibody dynamics simulation in Adams software.From this simulation,kinematics parameter curves of compressor's parts and stress characteristics of key components have been acquired.The results show that the structure is feasible,and the strength of the crank could satisfy the requirements.The stress ratio of the crankshafts in traditional compressors is not more than 0.14,but in this crankshaft it is 0.93,which is closer to the static stress,indicating better stress characteristics.The reciprocating inertial force causes the stress difference between the two pistons,influencing the crank stress.

TB652

国家自然科学基金(U1304521)；河南省高校科技创新人才支持计划(16HASTIT027)；河南科技大学创新团队资助(2015XTD004）