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The Gauss white noise is added to the Duffing oscillator system, illustrates the effect of the noise in the weak signal detection, simulates the phase distortion of the system in the periodic critical state caused by the noise. Finally an improvement scheme is put forward, and in the scheme the Gauss white noise is a part of the whole inner driving signal of the detection system.
The weak signal embedded in various noises is the subject of weak signal detection, while the noises much stronger than the valuable signal, and must take measures to improve the S/N during measuring the signal. So based on the signal-correlation principle, separates the useful signal from the noises by the measured-method of signal-correlation principle.
The system of weak strain data acquisition and processing is designed to enable the experiments of mechanics of materials to execute automatically. When the data have obtained from the apparatuses, it is critical to find the relationship between them. The accuracy and correctness of the data fitting function determines the reliability of the results. So some solutions should be adopted to solve the...
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