考虑刚柔耦合的振动筛动力学研究

摘要

振动系统动力特性研究是研发新型振动筛的关键环节。考虑电机特性和系统构件刚柔耦合性质，是预测振动筛动力特性和结构强度的一种新方法。首先，利用Lagrange-Maxwell方程模拟了交流电机转子转动特性；其次，运用有限元法将振动筛的主要构件柔性化，并对其固有频率和振型作了计算，建立系统的次要部件的刚性结构实现系统的刚柔耦合；最后，运用动态测试仪器测试了样机的加速度响应，与仿真模拟结果作对比研究。结果表明，振动筛在激振力作用下，结构的弹性振动会影响系统的动态特性；刚柔耦合法考虑了材料固有的弹性属性更能准确地预测振动筛的动态特性，该研究方法能应用于其他旋转和精密机械的动力学特性研究。%The key in the new type vibrating screen development is the study of the dynamic characteristics of the vibrating system. It is a new approach to estimating dynamic characteristics and structural strength of the vibration system considering the characteristics of induction motors and the coupling between rigid bodies and flexible bodies. The Lagrange-Max equation was applied to compute the rotation characteristics of the motor rotor first;the main bodies of the vibration screen were then considered as flexible bodies with FEM. By combining the flexible bodies with rigid bodies,we established the rigid-flexible coupling model. Finally,acceleration responses of the system were measured with testing instruments to verify the correctness of the new method. The results proved that the elastic vibration of the structure of the vibrating screen would influence the dynamic characteristics under the effect of vibration force;the rigid-flex coupling method can accurately forecast the dynamics characteristics of vibratory screens considering the inherent properties of the elastic material;therefore,this research method can also be applied to the dynamics study of rotation and other precision machineries.