中文摘要：

超声电机环形定子上的驻波变形和振型旋转的现象在实验中被观察到,行波和类行波出现在单相激励情况下。该文讨论了单相激励行波和类行波的成因,当环形定子具有一个非轴对称结构时,同形退化模态不再存在,代之以两个近频模态,由于结构阻尼对这两个模态贡献不同,使得响应出现相位差,行波出现。类行波实质上不是行波而是驻波的扭曲,只是看起来像行波。

英文摘要：

This present work deals with experimental and theoretical analyses of deformation and rotation of standing-wave modes in the annular vibrators of ultrasonic motors. The traveling-wave and traveling-wave-old are observed experimentally in the ring stators of ultrasonic motor by single-phase drive. When an annular vibrator has a non-axisymmetrical structure, some problems can exist and exert influences on its vibraional behavior. The degen- erate modes of the same form exist no longer, but the same order modes with near natural frequencies instead. The phase difference of time between the responses of modes emerges from different contributions of dampping to the different modes. The traveling-wave-oid observed in the vertical direction is not a normal traveling-wave but a distortion of standing-wave.