It is found that the system is subjected to the low-frequency excitation and occurs random vibration in the non-linear complex-mode form.
揭示了系统所受的是低频激励，以非线性复模态的形式作随机振动。
This paper analyzed the effects of several excitation controllers, and found that the unsuitable controller can cause a low frequency oscillation on power system.
本文经理论分析提出“系统中产生负阻尼的原因是不适当的励磁控制方式”的结论。
The data of polar motion, rotation of the earth and atmospheric excitation function are analysed by the Auto-Regression power spectrum method, and their spectra at low frequency band are obtained.
本文用自回归功率谱方法分析了极移、地球自转和大气激发函数的资料，得到了它们的低频谱。
The invention provides an ultra low frequency magnetic excitation device and a method for operating the device.
本发明提供了一种超低频磁刺激装置及其工作方法。
Analysis of dynamic simulation shows that this optimal excitation system can increase the system damping, improving stability, with good low-frequency oscillation suppression and robustness.
动态仿真分析表明，设计出的最优励磁系统能够有效地增加系统的阻尼，提高系统的稳定性，且能够很好地抑制系统的低频振荡，并具有较好的鲁棒性。
When the excitation frequency is relatively low, the material damping of inner region has negligible influence on the real stiffness of the soil.
当激振频率较小时，内部区域土体材料阻尼对土体扭转阻抗的刚度部分基本没有影响。
When the excitation frequency is relatively low, the material damping of inner region has negligible influence on the real stiffness of the soil.
当激振频率较小时，内部区域土体材料阻尼对土体扭转阻抗的刚度部分基本没有影响。
应用推荐