Application of Improved Wavelet Threshold De-noising Method in the High-performed Dynamic Centrifuge-Vibration Composite System
In order to solve the problem that the control signal in the vibration-high dynamic centrifugal composite test con-trol system is disturbed by noise,leading to poor control effect,the work aims to carry out noise reduction to improve the test control ability.The improved wavelet threshold de-noising method was used to de-noise the control signal in the vibration-high dynamic centrifugal composite test control system.By analyzing the signal characteristics and combining the principle of wave-let threshold de-noising method,an improved method of threshold criterion changing adaptively with decomposition scale was proposed.The comparative analysis of the improved method and other wavelet threshold noise reduction methods showed that the proposed method could significantly suppress the medium and high frequency noise interference in the vibration-high dy-namic centrifugal system,effectively retain the characteristics of the control signal,and obtain a better comprehensive noise re-duction effect.The signal-to-noise ratio was improved by nearly 10 dB,which met the noise reduction requirements of the test control.The wavelet threshold de-noising method based on adaptive dynamic threshold criterion is effective and reliable for de-noising the control signal of vibration-high dynamic centrifugal composite test system,which can provide a feasible idea for the research direction of related test technology in the following.
high dynamicvibration-centrifugal composite control systemnoisewavelet threshold de-noising methodthreshold criteriondynamic change
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