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用相干功率谱分析法辨识在多振源工况下的主要噪声源，并对被识别声源作自功率谱和倒功率谱分析，诊断出产生噪声的故障元件。
The main source of noise under multi-source conditions is identified by coherent power spectrum analysis, and the self-power spectra and inverted power spectrum of the identified sources are analyzed to diagnose the faulty elements that produce noise.