考虑柔性和间隙的螺旋引纬机构仿真分析

为了提高引纬机构的稳定性和精度，将柔性构件和间隙的影响考虑在内，联合ANSYS和ADAMS建立螺旋引纬机构的刚柔耦合模型，通过ADAMS进行动力学仿真，在刚性系统和刚柔耦合系统中分别分析了旋转铰间隙对剑杆输出特性曲线的影响。在对仿真数据的观察中发现了相当比例的噪声信号，为了消除噪声信号的影响，利用统计学中上下四分位数和中位数来识别替换异常值；在综合考虑间隙和柔性构件的影响时，利用减噪后的加速度曲线与理想刚体系统下的数据的偏差值得到一个新的曲线，该曲线在固定区间内做高频波动，呈现出类似周期性声波信号的特点。结果表明旋转铰间隙是影响剑杆稳定性和精度的主要因素，柔性构件和间隙的综合作用产生了趋向于周期性的碰撞影响。依据研 究结果可以进一步对原刚体模型下设计的引纬机构进行优化设计。

Simulation of Lead Screw Weft Insertion Mechanism Considering Flexibility and Clearance

ln order to improve the stability and accuracy of weft insertion mechanism, the influence of flexible component and clearance should be taken into consideration. The rigid-flexible model of lead screw weft insertion mechanism was built through ADAMS combining with ANSYS. Dynamics simulation was carried out by ADAMS. Considering the hinge clearance, the influence on the output characteristic curve of rapier was respectively analyzed for the rigid system and rigid-flexible system. A considerable proportion of noise signal was discovered in the simulation data, in order to eliminate the influence of the noise signal, the abnormal value was identified by upper and lower quartiles and replaced by median. A new curve was obtained by the deviation value between the de-noised acceleration curve and the one in rigid system. This curve does a high frequency wave in a fixed interval, presenting a similar characteristic of periodic acoustic signal. The result shows that: the hinge clearance is the major factor to the stability and accuracy of rapier movement; the collision impact tends to be cyclical by the comprehensive effect of clearance and flexible component.The weft insertion mechanism designed by rigid system can be further optimized based on those research results.