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本文以双谱分析理论为基础 ,分析并计算了设备在不同工作状态下噪声信号的双谱及其等高线图。分析和实验结果表明 ,双谱分析表达了三个谱元之间的相关性 ,可以识别系统的非线性特征 ,能够克服功率谱局限性和不足。相同工作状态下信号的双谱及其等高线图具有相似性 ,不同工作状态下信号的双谱及其等高线图具有明显的可分性。为噪声信号的特征量提取提供了新的分析手段 ,利用噪声信号的双谱分析可以有效地识别设备工作状态。这种方法在设备工作状态监测方面将会有良好的应用前景。
Based on bispectrum analysis theory, this paper analyzes and calculates the bispectrum and contour map of the noise signal under different working conditions. The analysis and experimental results show that the bispectrum analysis expresses the correlation between the three spectral elements, and can identify the nonlinear characteristics of the system and overcome the limitations and deficiencies of the power spectrum. Under the same working condition, the bispectrum of the signal and its contour map have similarities. The bispectrum of the signal and its contour map have obvious separability under different working conditions. It provides a new means of analysis for the feature extraction of noise signals. The bispectrum analysis of noise signals can effectively identify the working status of the equipment. This method will have a good application prospect in the monitoring of equipment working condition.