Appling conception of modal separation the first two order modes of the rotor-bearing system were obtained by research the free vibration displacement response for getting the logarithmic decrement.

• 运用模态分离的概念，通过求自由振动位移响应的对数衰减率而得到转子轴承系统的最低一、二阶模态的模态阻尼，亦称系统阻尼。