The Bernoulli-Euler beam theory can be used to estimate the vibration of large diameter ring-type USM, but to calculate the vibration of cylindrical-type USM Timoshenko beam theory must be applied.

• 伯努利-欧拉梁理论可以用来估算大直径环形行波型超声波电机的振动特性，但计算柱体行波型超声波电机的振动特性时必须采用铁木辛柯梁理论。