中文摘要：

目的针对假肢手接受腔挤压模块的功能需求，设计一种恒力输出的挤压机构。方法根据正负弹簧刚度抵消获得恒力的工作原理，基于有限元分析软件ANSYS进行仿真拟合，测定弹簧片的弹性刚度系数，从而计算获得正刚度弹簧的弹性刚度系数，对加工组装后的恒力挤压机构进行压力测试。结果恒力机构的仿真结果与实验结果一致，并且在3．5mm行程范围内实现了2％的压力恒定性。结论实验证实了挤压单元的恒力特性，为今后的假肢手接受腔分时分区控制奠定了基础。

英文摘要：

Objective To design a constant-force extrusion unit to meet the functional requirements of the prosthesis socket. Methods Based on the operational principle that the constant-force derives from offsetting of the positive and negative stiffness, the leaf spring was simulated based on the finite element analysis software. According to the simulation result of the leaf spring, the coefficient of spring stiffness was calculated. The constant-force unit after processing and assembling was tested by compression experiment. Results The simulation result was consistent with experimental result and the constant force of extrusion unit obtained an error about 2% within 3.5-mm range. Conclusions The constant-force characteristic is confirmed by experiment, which lays the foundation of realizing the time-shared and load-bearing hand prosthesis socket.