基于磁流变阻尼器的滚珠丝杠进给系统主动抑振研究

Active Vibration Suppression of Ball Screw Feeding System Based onMagnetorheological Damper

针对滚珠丝杠进给系统轴向振动影响工件的加工质量和精度保持性的问题,将磁流变阻尼器应用于机床滚珠丝杠进给系统轴向抑振。设计磁流变阻尼器,进行磁流变阻尼器阻尼特性试验,采用最小二乘法和BP神经网络对阻尼力进行了辨识。建立带有磁流变阻尼器的机床滚珠丝杠进给系统单自由度振动模型,基于Runge-Kutta法计算了系统的动态响应。通过数值计算发现:阻尼器输入电流由零逐渐增大时,系统能够快速趋向于稳定;由幅频曲线可以看出,磁流变阻尼器抑制滚珠丝杠进给系统的振动是可行的。最后试验验证了磁流变阻尼器能够很好地抑制滚珠丝杠进给系统的振动。

Aiming at the problem that the axial vibration of the ball screw feed system affects the machining quality and accuracy retention of the workpiece,the magnetorheological damper was applied to the axial vibration suppression of the ball screw feed system of machine tools.The magnetorheological(MR)damper was designed,and the damping force was identified by the least square method and BP neural network through the MR damper damping characteristics experiment.A single degree of freedom vibration model of machine tool ball screw feed system with MR damper was established,and the dynamic response of the system was calculated based on Runge-Kutta method.The results show that:the system can quickly tend to be stable as the input current of the damper increases;it can be seen from the amplitude frequency curve that it is feasible to suppress the vibration of the ball screw feed system with the MR damper.Finally,the experiment verifies that the MR damper can well restrain the vibration of the ball screw feed system.