CAJ | 학술논문

针对强背景噪声下微弱信号检测困难的问题，提出了一种级联分段线性随机共振的微弱信号增强检测方法。该方法采用分段线性随机共振模型，避免了经典双稳系统对强噪声下弱信号提取时存在的饱和现象，同时，选用的分段线性系统的级联方式可使高频噪声被有效滤掉，低频信号能量不断增强。仿真信号和滚动轴承故障信号的检测结果表明，该方法可以适应更低信噪比信号的检测，参数调节方便，检测结果优于级联双稳系统，具有良好的工程应用前景。
침대강배경조성하미약신호검측곤난적문제，제출료일충급련분단선성수궤공진적미약신호증강검측방법。해방법채용분단선성수궤공진모형，피면료경전쌍은계통대강조성하약신호제취시존재적포화현상，동시，선용적분단선성계통적급련방식가사고빈조성피유효려도，저빈신호능량불단증강。방진신호화곤동축승고장신호적검측결과표명，해방법가이괄응경저신조비신호적검측，삼수조절방편，검측결과우우급련쌍은계통，구유량호적공정응용전경。
Aiming at the detection problem of the weak signal under noise background,a method enhanced weak signal detection was proposed based on cascaded piecewise-linear stochastic resonance. In this method,a new model of piecewise-linear stochastic resonance was applied,that avoided the sat-uration phenomenon in classical bistable system when detecting a weak signal,and thus the cascaded piecewise-linear stochastic resonance were selected,which could remove high frequency noise efficient-ly and enhanced the energy of low frequency signals.Simulation signals and bearing inner-race defec-tive signals were analyzed,the results show that the proposed method is effective for raising the signal-to-noise ratio.Compared with cascaded bistable system,it is more convenient to adj ust less correlated parameters,and possesses a good prospect of engineering applications.