Creep Effect Analysis at the Friction Interface of a Rotary Ultrasonic Motor
Creep Effect Analysis at the Friction Interface of a Rotary Ultrasonic Motor
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旋转超声波电机摩擦界面的蠕变效应分析
DOI：
10.1142/s1758825115500313
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发表时间：
2015-04-01
影响因子：
3.5
通讯作者：
She, Chongmin
中科院分区：
文献类型：
--
作者：
Chen, Chao;She, Chongmin
本文对行波型旋转超声电机（TRUM）动静摩擦界面的蠕变机理进行了理论和实验研究。建立了一种复杂形状压电复合材料定子摩擦界面蠕变和接触压力分布的建模方法。定子的环形叠层结构在径向上被离散为半解析板单元，定子顶部的齿由有限元（FE）方法建模。在此基础上，提出了一种连续板与有限元离散齿的耦合分析方法。最后，对TRUM进行了加速老化试验，研究了TRUM在长期贮存过程中摩擦层的蠕变效应，并利用瞬态特性测试系统对TRUM的启动状态进行了实验研究。结果表明，TRUM的瞬态特性强烈影响的蠕变效应在摩擦界面。接触层的蠕变削弱了定子的振动响应，压电复合材料板的振幅随蠕变百分比的增加而减小。理论和实验证明，蠕变率超过20%会导致TRUM启动失败。
Theoretical and experimental studies for the creep mechanism at the friction interface between rotor and stator of traveling wave type rotary ultrasonic motors (TRUM) are performed in this work. A modeling method is developed to investigate the creep and the distributed contact pressure in the friction interface for the piezoelectric composite stator with complex geometries. The annular laminated structure of the stator is discretized into a semi-analytical plate element in the radial direction, and the teeth on top of the stator are modeled by the finite element (FE) method. Then a coupled approach for the continuous plate and FE discretized teeth is proposed to investigate the interface contact mechanism. Finally, the accelerated aging tests for TRUM are conducted to study the creep effect in the friction layer during the long-term storage, the startup state is investigated experimentally by the transient characteristics measurement system. It is shown that transient characteristics of TRUM are strongly affected by the creep effect at the friction interface. The vibration response of the stator is weakened by the creep of the contact layer, and the amplitude of the piezoelectric composite plate decreases with increasing creep percentage. It is theoretically and experimentally proved that the creep percentage of over 20% can lead to the startup failure of TRUM.