摘要
针对传统信号处理方法在低信噪比条件下对微弱信号检测的不足,提出一种对双Duffing振子进行阻尼项耦合的方法,通过对此系统进行动力学分析,比单个Duffing振子具有更加复杂的动力学行为。阐述了基于相平面变化的微弱信号检测原理,对时间进行尺度的变换,实现了未知频率信号的检测,最后对微弱脉冲信号进行检测以及真实的故障轴承的早期诊断,取得了较好的效果,该方法在无线通信、雷达系统、旋转机械早期故障诊断等领域具有广阔的前景。
For the shortage of the traditional signal processing method in weak signal detection in low SNR condition, anew system detection method based on a double Duffing oscillator is proposed. Through dynamic analysis, this system isfound to have a more complex dynamic behavior than that of the single Duffing oscillator. The principle of weak signaldetection based on phase plane changing is expounded. Through transforming the time scale, the unknown frequency signalsare detected. Finally, the weak pulse signal is detected and the early fault diagnosis of a real bearing is realized, and goodresults are obtained. This method has broad prospects for application in early fault diagnoses of wireless communications,radar systems and rotating machinery.
出处
《噪声与振动控制》
CSCD
2016年第3期174-178,209,共6页
Noise and Vibration Control
基金
国家自然科学基金资助项目(11172182,11227201,11472179)
