假肢膝关节磁流变阻尼器的多目标优化设计与分析

为解决目前应用于假肢膝关节的磁流变阻尼器(magnetorheological damper,MRD)存在的问题,通过建立假肢膝关节磁流变阻尼器结构参数与优化目标之间的关系模型;以磁流变阻尼器的低功耗化及轻量化为优化目标,采用多目标遗传算法对其关键几何尺寸进行优化,分析各参数对优化目标的影响,并得出最优化的解。研究结果表明:优化过后的假肢膝关节磁流变阻尼器的体积及功耗分别减小了21%和36%,同时其输出阻尼力并没有受到影响;阻尼器的功耗优化与体积优化之间存在相互制衡关系,因此在寻求最优解时,应考虑实际情况的需要,选择最为合理的参数。

Multi-objective optimal Design and Analysis of Magnetorheological Damper for Knee Joint of Artificial Limb

In order to solve the problem of magnetorheological damper (MRD) used in prosthetic knee joint at present, the relationship model between the structural parameters of Mr damper and the optimization target is established. The key geometric dimensions of Mr damper are optimized by using multi-objective genetic algorithm, and the influence of each parameter on the optimization objective is analyzed, and the optimal solution is obtained by taking the low power consumption and light weight of Mr damper as the optimization objective, and using the multi-objective genetic algorithm to optimize the key geometric dimensions of Mr damper. The results show that the volume and power consumption of the optimized Mr damper are reduced by 21% and 36% respectively, and the output damping force is not greatly affected, and there is a phase between the optimization of the power consumption and the volume optimization of the damper. Therefore, in the search for the optimal solution, the most reasonable parameters should be selected considering the needs of the actual situation.