基于信息熵的渦旋壓縮機的故障診斷研究
[Abstract]:In recent years, the platform of the test system based on scroll compressor and the analysis of its vibration and noise have shown a very broad application prospect, but it is still difficult to meet the requirements of monitoring the running state of scroll compressor. Because the application time of scroll compressor in China is not very long, the fault analysis of scroll compressor in the process of its use is not much, and it is still in the initial stage of building test platform to describe its working state by traditional single spectrum analysis. The performance data of its operation condition can not be obtained by accurate mathematical model calculation. Moreover, the vibration source of scroll compressor is more, the signal of shell surface is non-stationary and non-linear, so the fault diagnosis of scroll compressor is more complicated. On the basis of conventional spectrum analysis, this paper uses multi-angle information fusion to distinguish the fault of non-stationary signal more accurately. Based on the idea of vibration signal analysis and the theory of entropy and grey correlation degree in information theory, a singular spectral entropy based on time domain and power spectral entropy in frequency domain is established in this paper. A new fault diagnosis method based on time-frequency domain wavelet energy spectrum entropy and wavelet spatial characteristic spectrum entropy is proposed and used as a quantitative characteristic index for comprehensive evaluation of the vibration state of scroll compressor. Several difficulties are analyzed in this paper. One is the parameter selection of the embedding delay theory of singular spectral entropy, which is directly related to the discrimination effect of singular decomposition on the effective information and noise of the signal. Secondly, the traditional probability entropy is improved when the sliding window is added, so that the power spectrum entropy and the wavelet spectrum entropy reflect the distribution difference and change of the local characteristics of the signal. The mathematical models of singular spectral entropy, power spectral entropy, wavelet energy spectrum entropy and wavelet characteristic spectral entropy are established by using several algorithms of information entropy in MATLAB signal processing toolbox. Combined with the entropy reference samples of the scroll compressor at different speeds and the samples to be diagnosed, the grey correlation analysis is carried out, and the quantitative results of the grey correlation degree are directly used to realize the good identification of several faults of the scroll compressor. The validity of this fault diagnosis method is proved.
【學位授予單位】:蘭州理工大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:TH45;TN911.7;O236
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