基于SWT与相空间曲变的控制棒驱动机构退化状态跟踪和识别

Tracking and Identifying CRDM Degradation State Based on SWT and Phase Space Warping

控制棒驱动机构(CRDM)是保证反应堆正常运行与安全的重要设备。针对其转速低、性能退化特征微弱且易受其他信号源干扰的特点,本文采用小波半软阈值(SWT)与相空间曲变相结合的方法对其退化状态进行了跟踪与识别。通过与基于振动幅值均方根(RMS)方法的对比,表明该方法能够克服传统基于线性信号处理理论对微弱性能退化状态不能很好地跟踪和识别的缺点,可以较好地对强背景噪声下的旋转机械性能退化状态进行跟踪和识别。

The control rod drive mechanism(CRDM)is important for ensuring the normal operation and safety of reactors.Considering the low speed,latent performance degradation signs,and susceptibility to interference from other signal sources of the CRDM,this paper tracks and identifies the CRDM degradation state by a combination of the semi-soft wavelet threshold(SWT)and phase space warping(PSW).By comparison with the method based on the root mean square(RMS)of vibration amplitude,the method combining the SWT with PSW,unlike the traditional linear signal processing theory with poor performance in tracking and identifying the latent performance degradation state,can track and identify adequately the performance degradation state of rotating machinery with high background noise.