Calculations were conducted of the fan rotor natural frequency, vibration modes and critical speeds.
本文针对风机转子进行了固有频率振型和临界转速计算。
Natural frequency of tail rotor of some kind of helicopter with uncertain composites was studied.
研究具有不确定复合材料参数的某型直升机尾桨的固有频率。
The results show that the violent flexible vibration will happen if the motivation frequency equals to the natural frequency of the rotor.
结果表明，当外加激励的频率等于转子的固有频率时，将诱发转子产生大幅的轴向挠性振动。
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