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Detection of signal component modulations using modulation intensity distribution

机译:使用调制强度分布检测信号分量调制

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摘要

Modulations in vibration signals that are generated by rotating machinery carry a lot of useful information about health condition. This paper proposes a technique for detection of modulations, called modulation intensity distribution (MID), which may be considered as a generalization of the spectral correlation density. It applies to most common types of modulations in mechanical systems thanks to an open module that can be tailored accordingly by the user. This leads to specific versions of the MID based on the RMS value, the spectral correlation or the kurtosis, which apply to the detection of amplitude modulations of either discrete or random carriers. The algorithm for calculation of the MID is described and tested on both simulated signal and experimental vibrations. The utility of MID in the diagnostic of rolling element bearing is demonstrated to be a natural extension of narrow band envelope analysis.
机译:旋转机械产生的振动信号调制会携带许多有关健康状况的有用信息。本文提出了一种用于检测调制的技术,称为调制强度分布(MID),可以将其视为频谱相关密度的概括。得益于用户可以相应定制的开放式模块,它适用于机械系统中最常见的调制类型。这导致基于RMS值,频谱相关性或峰度的MID特定版本,适用于检测离散或随机载波的幅度调制。描述了MID的计算算法,并在模拟信号和实验振动上进行了测试。 MID在滚动轴承的诊断中的实用性被证明是窄带包络分析的自然延伸。

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