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Invention Publication
CN1456872A 一种诊断齿轮和滚动轴承故障的方法 无效 - 撤回

一种诊断齿轮和滚动轴承故障的方法
Abstract:
本发明涉及一种齿轮和滚动轴承故障的诊断方法。为克服现有技术中存在的信号的调制特征不清晰的不足之处，本发明采用了对信号进行时延相关解调的方法，即先对测量的齿轮或滚动轴承振动信号进行自相关分析，得到自相关信号Rx(τ)。对自相关信号Rx(τ)进行时延Δτ后，再进行希尔伯特变换，得到自相关信号的虚部x(τ+Δτ)。由Rx(τ+Δτ)和x(τ+Δτ)得到自相关信号的包络为P(τ+Δτ)=R2x（τ+Δτ）+2x（τ+Δτ），对包络信号P(τ+Δτ)进行频谱分析，就得到包络谱。自相关分析不改变原始振动信号的调制性质，却显著地降低了噪声。另外，对自相关信号时延Δτ之后，进一步抑制了噪声的影响。因此，时延相关解调是一种降噪的解调方法，凸现了信号的调制特征，有利于提高齿轮或滚动轴承故障诊断的准确性。
Abstract(English):

The present invention applies method of carrying on delay correlation demodulation for the signal. That is to carry on self-correlation analysis to the measured vibration signal of gear antifriction bearing to obtain the self-correlation signal Rx(*). The imaginary part x (*+*) of the self-correlation can be obtained after self-correlation Rx(t)having been delayed with Dt and then having been Hibert tansformed. The self-correlation envelope P(*+*)=*** can be obtained from Rx(*+*)ax(*+*) as the envelope chart is able to be obtained by carrying on frequency spectrum analysis for envelope signalP (*+*).

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