The damping characteristic of a single-machine and infinite bus system was analyzed, and the relation between damping torque coefficient and transmission power was derived.

分析了单机无穷大系统的阻尼转矩机理，得出了阻尼转矩系数与输送功率的关系。

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A unified definition for damping torque coefficient of synchronous machines is proposed in this paper according to the principle of synthetic damping coefficients deduced from the Lyapunov Theorem.

根据由李亚普诺夫定理导出的综合阻尼系数的原理，统一定义了同步发电机的动态阻尼力矩系数和动态同步力矩系数。

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Under the assumption of constant torque damping coefficient, the step response of an ultrasonic motor is obtained from the moment equation of the rotor, and also the property is deduced.

从超声马达转子的运动方程入手，在假定转子受定常阻尼的条件下，求解出阶跃响应，并由此推导出超声马达的输出特性。

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