With increasing in stiffness and excitation force, the distance between amplitude-frequency curves of the system enlarges.
随着弹簧刚度和激力的增大，系统幅频响应曲线上下两条曲线的距离逐渐增大。
If mass or stiffness perturbation is considered to be a harmonic excitation, one has obtained a forced vibration equation to the original structure.
将质量和刚度摄动看成是对原结构的简谐激励，获得原结构广义坐标的受迫振动方程。
By measuring both original unbalance response and excitation response, dynamic stiffness and damping coefficients of fluid bearings and rotor unbalances can be calculated.
通过测量转子的原始不平衡量响应和激励响应，计算出滑动轴承的刚度和阻尼系数及转子的不平衡量。
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