针对电动沙发八杆搁脚机构运行过程中存在的平稳性较差问题,对搁脚杆系运动过程中的速度及传动角变化进行了研究.为提高搁脚机构杆件运动速度的平稳性,采用杆系运动学理论建立了八杆搁脚机构各运动杆件的位置、速度方程,通过Matlab运行了理论模型,然后与Adams中的运动仿真分析进行了对比,评价了理论模型的正确性;在理论模型的基础上,采用了遗传算法作为优化算法,以搁脚机构运行过程中速度的平稳性即速度波动性最小为目标,对搁脚机构的杆件尺寸进行了优化;将优化前后的模型参数输入到Adams中仿真分析并进行了比较,分析了优化结果.研究结果表明:优化后搁脚机构的速度平稳性得到了提升,同时搁脚机构的传动角也得到了相应的增加.%Aiming at the problem of the unstability of the foot rest mechanism during working process,the velocity and transmission angle of the eight-bar rest mechanism were studied. The position and velocity equations of the eight-bar rest mechanism were established by using ki-nematic theory of rod system for better stability,and the theoretical model that operated in Matlab was evaluated by the motion simulation a-nalysis in Adams. Based on the theoretical model,the size of the rod of the foot rest mechanism was optimized by genetic algorithm with the stability of the running speed of the foot rest mechanism as goal. Then,the model parameter before and after optimization were imported into Adams to simulation analysis. The results indicate that after optimization,the speed stability of the foot rest mechanism is improved and the transmission angle is also increased.
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