Rigid rotor is unbalancing if its axis of rotation is not uniform with its central principal inertia axis , . unbalance imposes cyclic forces on bearings and shafts , producing vibaration , even damaging machinery 剛性轉(zhuǎn)子的旋轉(zhuǎn)軸線(xiàn)如果與其中心主慣性軸不重合,則此轉(zhuǎn)子是不平衡的,不平衡將會(huì)在軸承上產(chǎn)生周期性慣性力,引起振動(dòng),甚至損壞機(jī)器設(shè)備。