蠕动式压电电流变液进给机构的负位移现象  

The Recession Phenomenon of the Piezoelectric-electrorehological Inchworm Stepper Mechanism

作　　者：李翠红[1] 孟永钢[1] 田煜[1] 叶子申[1] 温诗铸[1] 

机构地区：[1]清华大学精密仪器及机械学系摩擦学国家重点实验室,北京100084

出　　处：《润滑与密封》2006年第9期11-14,共4页Lubrication Engineering

基　　金：国家863项目(2002AA23240);国家自然科学基金项目(50202010)

摘　　要：为研制电流变液作为钳位介质的大行程高精度蠕动式进给机构,以压电陶瓷作为驱动元件,沸石/硅油型电流变液作为钳位介质,研制了蠕动式压电电流变液直线式进给机构样机,并利用计算机编程对机构的进给运动进行了控制,发现机构运动中存在负位移现象并研究了压电陶瓷驱动电压、电流变液钳位电压以及电流变液充放电时间对机构负位移的影响,建立了机构的动力学模型,对影响负位移大小的因素进行了定性探讨。结果表明,机构运动过程中,极板所受的作用力主要是钳位力、阻尼力和压电陶瓷的驱动力,增大钳位力,减小阻尼力,增大驱动力同时减缓驱动力的变化速率,对减小负位移有利。A linear inchworm feed mechanism was developed using piezoelectric ceramic as actuator and electrorheological （ER） fluid based on zeolite and silicone oil as clamping way. The recession phenomenon was disclosed in the system＇ s movement which was under the control of computer. The influences of driving voltage, clamping voltage and the charging and discharging time of the ER fluid on the recession displacement was discussed. A kinetic model of the system was established and illustrated the intrinsic mechanism of those phenomena. The results indicate that the main force on the polar plate, when the mechanism is moving forward,are the clamping, damping force produced by the ER fluid and the driving force produced by the piezoelectric driver. Increasing the clamping force, reducing the damping force, raising the driving force and at the same time slowing up the extension velocity of the driver are beneficial to reducing the recession displacement.

关 键 词：蠕动 压电 电流变液 负位移 

分 类 号：TB34[一般工业技术—材料科学与工程]