In a rotating system, unbalance default often happens which is resulted in the inertial force or inertia moment of unbalance weight.
在旋转机械中，存在着大量的转子不平衡故障，这是由转子不平衡质量的惯性力或惯性力矩所造成的。
2
The balancing machine of the gravitation type is an equipment for detecting the unbalance of disc-shaped parts by means of the moment caused by centre-of-gravity shift.