利用MRD实现并联机床振动控制的研究  

Application of MRD to Vibration Control of Parallel Machine Tools

作　　者：胡明[1] 郭成[1] 蔡光起[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2008年第9期1330-1333,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(5057038)

摘　　要：为解决并联机床实际结构动态特性差的弱点,将并联机床简化成黏性阻尼动力学模型,根据振动理论,分析了改变阻尼减小振动的机理.只有在外激励输入频率与结构固有频率的比值超过某一比值时,采用变阻尼控制才有可能同时取得位移峰值和加速度峰值的减少,取得减振控制效果.探讨了半主动控制提高并联机床的动刚度原理,提出采用磁流变液阻尼器作为减振器,提高其动态特性的方法.根据磁流变体的宾汉塑性模型,结合并联机床的特点,设计和制作了并联机床磁流变减振器虎克铰.To improve the dynamic characteristics of actual structure of parallel machine tools,they are reduced with a viscous damping model based on dynamics,which is developed according to vibration theory.Analyzing the mechanism of damping vibration attenuation,it is found that only if the value of the ratio of the external excitatory frequency input to the natural frequency of machine tool structure exceeds a certain value,the peak values of both displacement and acceleration can be decreased simultaneously by the control of variable damping so as to control the vibration attenuation.The principle of semi-active control system to improve the dynamic stiffness of parallel machine tools is discussed,and the MRD is therefore proposed to improve their dynamic characteristics.According to the Bingham plasticity model for magnetorheological structure in combination with the features of parallel machine tools,a Hooke＇s universal joint was designed and made for MRD.

关 键 词：磁流变液阻尼器 并联机床 虎克铰 半主动控制 动态特性 

分 类 号：TP242.2[自动化与计算机技术—检测技术与自动化装置]