摘要
针对某微型雷达反射镜伺服系统,将影响微型雷达精度的关键部件设为柔性体,并根据实际要求添加约束和运动关系,利用MSC Adams和MSC Nastran软件对其进行多体动力学仿真,以研究正弦角位移运动函数和梯形角速度运动函数作用下电动机轴与译码器轴两端的滞后角度特性规律.研究表明,柔性体弹性振动的存在使第1电动机轴与第1译码器轴之间产生滞后现象;滞后角度的最大值与运动函数的周期和幅值均有关,并呈现非线性规律;在函数周期和幅值相同的情况下,梯形角速度运动函数所产生滞后角度的最大值明显小于正弦角位移运动函数;由于梯形角速度运动函数在加速段、匀速段和减速段频率不一致,因此会引发运动中的多谐波干扰和多模态振动等问题.
The multi-body dynamics simulation is done on the reflector servo system of a mini-radar system by using MSC Adams and MSC Nastran, in which the key part that affects the mini-radar＇ s precision is treated as flexible body, and into which the proper constraints and movements are added according to actual case. The purpose is studying how the lag angle between electronic shaft and encoder shaft is affected under the effect of sine angular displacement motion function and trapezoid angular velocity motion function. The study shows： there is lag between the first electronic shaft and the first encoder shaft due to vibration of flexible bodies ; the maximum lag angle is related to the periods and amplitude of motion function and presents nonlinear rule; the lag angle generated by trapezoid angular velocity motion function is distinctly less than that of sine angular displacement motion function when the periods and amplitude of them are same; trapezoid angular velocity motion function can raise harmonic disturbance, vibration of multi-mode and so on, because its frequency of accelerated, uniform and decelerated motion are not same.
出处
《计算机辅助工程》
2007年第3期136-139,共4页
Computer Aided Engineering
基金
中国科学院上海市技术物理研究所合作项目
