A new method of holospectrum based on zoom spectrum and correction of phase difference was put forward against to the lower precision of traditional holospectrum in intensive spectrum environment.First, it took complex analytical band-pass filter to conduct zoom,analysed the local range, the center of which was order frequency, and then the impact of intensive spectrum could be eliminated by increasing the frequency resolution. With correction of phase difference for the max peak, the amplitude and phase of each order frequency can be acquired.At last, the holospectrum was synthesized.Through simulation and analysis of flexible rotor's vibration signals,the results show that it has higher precision in practice and can diagnose the rotation machinery fault more accurately and more effectively.

intensive spectrum, zoom, phase difference, holospectrum

针对全息谱在频谱密集情况下精度会降低的问题,提出了基于频谱细化和相位差校正的全息谱分析方法。该方法采用复解析带通滤波器选带细化方法对以阶次频率为中心的局部区间进行细化分析,通过提高频率分辨率来消除密集频谱对精确获取幅值、相位信息的影响,运用相位差法对细化区间内的最大谱峰进行频率、幅值、相位校正,准确地提取出各阶次的幅值、相位信息,最后合成全息谱图。仿真及对柔性转子试验台振动信号的分析结果表明,基于频谱细化和相位差校正的全息谱能有效提高其分析精度,更加精确有效地诊断旋转机械的故障。

密集频谱, 细化, 相位差, 全息谱 

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