The cause of acoustic loss is considered as the viscous damping and the effect of impurity.
声损耗的原因认为是粘滞阻尼和杂质效应。
2
The exciter current an exponential relationship with transmitted torque, torque by unit moment of inertia and viscous power loss.
励磁电流与传递力矩、单位转动惯量传递的力矩等成指数关系，与功率损耗成负指数关系。
3
Hot - Water drive is an important method to enhance recovery of high viscous oil, and widely is applied abroad because of less hot loss. Hot - Water drive has its special mechanism.