噪声非线性效应的增强与弱涡街信号检测方法

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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.

Key words： noise nonlinear enhance effects weak vortex signal detection symmetric parabolic potential function

Received: 08 June 2015 Published: 25 July 2016

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2016/V35/I15/168

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