Detecting method based on multi-frequency stimulation Duffing chaotic oscillator weak signal detection system
A weak signal detection and chaotic oscillator technology, applied in the field of signal detection, can solve the problems of affecting the detection effect and difficult evaluation
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Embodiment 1
[0053] Such as figure 1 As shown, this embodiment is based on the detection method of the multi-frequency excitation Daphne chaotic oscillator weak signal detection system, including the following steps:
[0054] 1) Construct the weak signal detection system of multi-frequency excitation Daphne chaotic oscillator, as follows:
[0055] 1.1) Select the free vibration Daffin chaotic oscillator mathematical model:
[0056] x · · + k x · - x + x 3 = 0 - - - ( 1 )
[0057] Among them, k is the damping coefficient of the Daphne oscillator, (-x+x 3 ) is the nonlinear restoring force term;
[0058] 1.2) Decompose the noise-free detected signal s(t) into the form of harmonic superposition of differe...
Embodiment 2
[0076] This embodiment takes ultrasonic guided wave non-destructive testing as an example, as follows:
[0077] 1) The single-frequency superposition signal modulated by the Hanning window is commonly used in the ultrasonic guided wave nondestructive testing, and its general expression is:
[0078] s ( t ) = [ 1 2 ( 1 - cos 2 π f c t n ) ] sin ( 2 π f c t ) - - - ( 6 )
[0079] Among them, f c is the center frequency of the ex...
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