三次B样条曲线的四杆机构形状优化与仿真

发布时间：2018-07-14 07:17

【摘要】：四杆机构运动过程中输出的摆动力和摆动矩较大,导致机构产生很大的噪音,不能很好地满足工作环境的要求.对此,针对四杆机构形状问题进行了优化,实现输出的摆动力和摆动矩最小化.构造四杆机构的运动简图,对四杆机构运动进行受力分析,给出了输出摆动力和摆动矩的计算公式,引入了B样条曲线构造四杆机构的形状.B样条曲线的控制点作为设计变量,结合具体实例确定四杆机构中需要优化的目标对象,采取遗传算法搜索出最优解,对相关参数进行仿真.仿真结果显示,优化前输出的摆动力和摆动矩最大值大约分别为19N和30N·m,优化后输出的摆动力和摆动矩最大值大约分别为6N和12N·m.优化后的四杆机构输出的摆动力和摆动矩相对较小,运动比较平稳,噪音较低,效果较好.
[Abstract]:The output of pendulum force and swing moment in the motion process of the four-bar mechanism is large, which causes the mechanism to produce a lot of noise and can not meet the requirements of the working environment well. In this paper, the shape problem of the four-bar mechanism is optimized to minimize the output pendulum force and the swing moment. The kinematic diagram of the four-bar linkage is constructed, the force of the four-bar mechanism is analyzed, the formulas for calculating the output pendulum force and the swing moment are given, and the control point of the shape of the four-bar mechanism is introduced as the design variable. The target object in the four-bar linkage is determined by an example. Genetic algorithm is used to search the optimal solution and the relevant parameters are simulated. The simulation results show that the maximum values of the output pendulum force and moment are about 19N and 30N m, respectively, and the maximum values of the output forces and moments are about 6N and 12Nm, respectively. The output force and moment of pendulum are relatively small, the motion is relatively stable, the noise is low and the effect is better.
【作者单位】：云南机电职业技术学院机械工程系;昆明理工大学机电工程学院;
【基金】：云南省自然科学基金资助项目(2012ZC030)
【分类号】：TH112

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