Research on Weak Resonance Signal Detection Method Based on Duffing Oscillator

In this paper, detection model of Duffing oscillator is established and two detection algorithms are used to detect weak resonant signal in noises. The maximum Lyapunov exponent is used to obtain the threshold value and monitor motions transition of detection system. Simulation experiment on weak signal under different levels of noises is conducted, and comparison of detection performances of two detection algorithms is done. Simulation experiment results show that detection model can effectively detect the weak signal and accurately obtain the resonant frequency, and it is immune to the noises.