摘要
针对空间四杆引纬机构剑带运动平稳性差和运动精度低等问题,从机构运动参数和结构刚度两方面对该机构进行了优化设计研究。首先,运用空间机构学理论分析了剑带的运动规律,并利用软件仿真验证了其正确性,为优化设计提供了理论基础;然后,以剑带最大加速度最小化为目标,以满足引纬工艺和性能要求为约束条件,利用ADAMS参数化建模对该机构进行了优化分析;考虑引纬机构高速运转下不可忽视的柔性问题,建立了刚柔耦合模型并进行了仿真,分析了各个构件柔性变形对剑带运动精度的影响;最后,以连杆为例,以减小剑带加速度误差为目标,提出了通过增加截面尺寸、提升结构刚度来降低构件柔性变形影响的方法。研究结果表明:对运动参数进行优化后的剑带最大加速度减小35.7%,运动平稳性得到提升;对结构刚度进行优化后的剑带加速度误差明显减小,运动精度得到提高。
Aiming at the poor motion stability and low motion precision of the spatial four-bar weft insertion mechanism,the optimal design of the mechanism was studied from two aspects of mechanism motion parameters and structural stiffness.The motion law of the sword belt was analyzed by using the spatial mechanism theory,and its correctness was verified by software simulation,which provided a theoretical basis for optimal design.With the goal of minimizing the maximum acceleration of the rapier belt and meeting the weft insertion process and performance requirements as constraints,the mechanism was optimized and analyzed by using ADAMS parametric modeling.Considering the flexibility problem that could not be ignored in the high-speed operation of the weft insertion mechanism,a rigid-flexible coupling model was established and simulated,and the influence of flexible deformation of each component on the motion accuracy of the belt was analyzed.Taking the connecting rod as an example,in order to reduce the acceleration error of the sword belt,it was proposed that the influence of flexible deformation of the member could be reduced by increasing the section size to improve the structural stiffness.The results indicate that the maximum acceleration of the sword belt is reduced by 35.7%,and the motion stationarity is improved after the optimization of the motion parameters;the acceleration error of the sword belt is significantly reduced,and the motion accuracy is improved after the optimization of the structural stiffness.
作者
周凯红
张学谦
郭玉田
ZHOU Kai-hong;ZHANG Xue-qian;GUO Yu-tian(College of Mechanical and Control Engineering,Guilin University of Technology,Guilin 541006,China)
出处
《机电工程》
CAS
北大核心
2021年第3期383-387,共5页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(51265008)
国家重点实验室开放基金资助项目(HPCM-2013-06)
广西自然科学基金面上资助项目(2018JJA160072)。
关键词
引纬机构
参数化建模
刚柔耦合
优化设计
ADAMS
weft insertion mechanism
parametric modeling
rigid-flexible coupling
optimization design
ADAMS
