旋转式多臂机提综机构动力学分析与优化

Dynamic analysis and optimization of rotary dobby lifting comprehensive mechanism

为提高旋转式多臂机的整体性能,对提综机构进行深入的动力学特性研究。首先,基于凸轮机构的解析法设计理论,结合织机开口工艺要求,设计出旋转式多臂机提综机构凸轮廓线,应用Lagrange方程建立机构的动力学模型,并对机构进行运动学分析;其次,建立机械系统动力学自动分析(ADAMS)虚拟样机模型,对比分析Mat Lab数值仿真和ADAMS虚拟仿真所求大圆盘驱动力矩的一致性,验证所建动力学模型的正确性和有效性;最后,依据所构建的动力学模型,分别就大圆盘转速、综框的材料及动程、凸轮廓线对大圆盘驱动力矩的影响进行仿真分析和优化。结果表明:减小综框质量和综框动程和采用五次项修正等速运动规律的提综凸轮廓线,均可减小大圆盘驱动力矩的波动幅值,改善提综机构整体动力学性能。

In order to improve the overall performance of the lifting comprehensive mechanism,the dynamic characteristics were deeply studied.Firstly,based on the analytical design theory of the cam mechanism and the requirement of the loom shedding process,the cam profile of the rotary dobby lifting mechanism was designed.On this basis,the kinematic model was established.The dynamic model of the mechanism was established by using the Lagrange equation.Secondly,the virtual prototype of this mechanism was established in automatic dynamic analysis of mechanical systems(ADAMS),and the consistency of the drive torque for large disk by MatLab and ADAMS were compared and analyzed to test the correctness and validity of the proposed dynamic model.Finally,based on the constructed dynamic model,the influence of rotating speed of the big disk,the material and the movement distance of the heald frame,the theoretical profile of the heald cam on the driving torque of the large disk were simulated and optimized,respectively.The results show that reducing the mass and movement distance of heald frame,using a cam profile of the lifting comprehensive mechanism with five modified constant speed motion laws can reduce the fluctuation quantity of the driving torque for the large disk and improve the whole dynamic performance of the lifting comprehensive mechanism.