使用平滑算法消除倍频点、半频点和随机点产生的误差，实现基音曲线平滑。
Smoothing algorithm is exploited to remove the errors of multiple frequency point, half frequency point and random point, and realize pitch curve smoothing.
油膜失稳引起的转定子碰摩故障，会产生一些低频成分，油膜振荡会产生半频成分；
The analysis results also indicate rub-impact faults induced by oil-film instability can produce some low-frequency components with small amplitude and oil whip can produce half frequency component;
提出造成气膜端面密封角向摆动自振的内在机理，既有半频摆动自振又有角向气锤自振。
It is posed that angular air-hammer self-excited vibration and half frequency wobble self-excited vibration are two reasons for resulting angular wobble self-excited vibration for gas film face seals.
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