基于分形理论的故障诊断技术方法

Bingcheng Wang, Z. Ren
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引用次数: 1

摘要

在实验阶段,模拟并采集了油鞭故障信号、摩擦-冲击故障信号、摩擦-油鞭耦合故障信号和摩擦-油鞭-松耦合故障信号四种不同的故障信号。利用分形理论,分别计算了X方向和Y方向振动信号的分形维数,得到了两个方向的合维数。然后,将合成维数及其维能谱作为特征量,实现特征提取和识别。由于合成维数是两个方向振动信号分形维数的综合,因此它将两个方向的振动信息结合在一起。因此,该方法能全面、真实地反映机械系统的振动特性,大大提高了故障诊断的可靠性。
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Technical Method of Fault Diagnoses Based on Fractal Theory
Four different fault signals are simulated and collected which are oil whip fault signal, rub-impact fault signal, rub-oil whip coupling fault signal and rub - oil whip - loose coupling fault signal In the experimental stage. Using fractal theory, fractal dimension of vibration signal of X direction and the Y direction are separately calculated and resultant dimension of these two directions is obtained. Then, resultant dimension and its dimension energy spectrum are used as characteristic quantity to achieve the feature extraction and recognition. Because resultant dimension is synthesis of the fractal dimension of two directions vibrates signal, it combines the vibration information of two directions. Therefore, it can reflect comprehensively and really mechanical system's vibration characteristic, the reliability of failure diagnosis is greatly improved.
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