Abstract：The effects generated by interaction of noise and nonlinear potential field can enhance weak signals. Aiming at the problem that the weak vortex signals generated by low flowrate are difficult to detect, from the viewpoint of enhancing noise nonlinear effects, the noise effects of different nonlinear potential function are compared, a symmetric parabolic potential function is constructed. The theoretical analysis and numerical simulation manifest that the system with symmetric parabolic potential function has a higher SNR. A method to detect weak vortex signals is presented, which uses the enhancement of noise effects of symmetric parabolic system. The detection results of real vortex signal indicates that this method can effectively obtain the characteristic frequency of low flow vortex signals.
唐迅捷，林敏，黄咏梅. 噪声非线性效应的增强与弱涡街信号检测方法[J]. 振动与冲击, 2016, 35(15): 168-172.
TANG Xun-jie LIN Min HUANG Yong-mei. The enhanced noise nonlinear effects and the detection method of weak vortex signals. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(15): 168-172.
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