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通过研究碰摩声发射波中的模态特征,为判断碰摩状态及识别碰摩信号与噪声提供依据.在静态下进行试验以获得纯净的碰摩信号,在转子试验台的碰摩源分别施加碰撞力和摩擦力,对这2种力激励的近似原始声发射波的模态成分以及这2种类型波经过一段距离传播后的特征进行了分析.在动态时模拟不同程度的碰摩故障,结合静态时得到的分析结论对其声发射信号谱进行判断.试验结果表明,碰撞力主要激励弯曲波,摩擦力主要激励高频低能扩展波和部分高频弯曲波.在实际的碰摩故障中,随着碰摩的发展其激励的声发射波的模态成分随之变化,因此,通过对声发射信号频谱的变化特征可以判断出碰摩状态和发展趋势.
By studying the modal characteristics of the rubbing acoustic emission wave, it provides the basis for judging the rubbing status and recognizing the rub-impact signal and noise.At the same time, Applying the collision force and the friction force, the modal components of the approximate original acoustic emission waves excited by the two kinds of forces and the characteristics of the two types of waves propagating through a distance are analyzed. In the dynamic simulation of different levels of rub-impact fault , The acoustic emission signal spectrum is judged with static analysis results.The experimental results show that the main bending force is mainly excited by the impact force and the friction force mainly excites the high frequency low energy extension wave and some high frequency bending waves.In the actual rub-impact fault , The modal composition of acoustic emission excited by rubbing changes with the development of rubbing. Therefore, the rubbing state and development trend can be judged by the changing characteristics of acoustic emission signal spectrum.