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提出了类周期概念，利用拓展的周期信号自相关函数，实现了柴油机缸盖振动信号类周期的识别和主要振动波形的提取。实践证明，该方法的准确性高，有利于实现数据处理的智能化，为进一步分析柴油机缸盖振动信号奠定了扎实的基础。
Based on the extended periodic signal autocorrelation function, the concept of quasi-periodicity is proposed. The identification of the periodic vibration signal of diesel engine cylinder head and the extraction of the main vibration waveform are realized. Practice has proved that the accuracy of the method is conducive to achieving intelligent data processing, in order to further analyze the vibration signal of diesel engine cylinder head has laid a solid foundation.