The Feature Extraction of Hydraulic Pump Based on Multiscale Local-maximum Sample Entropy
MA Ji-qia · Chinese Hydraulics & Pneumatics · 2014
A new method,multiscale local-maximum sample entropy is proposed to measure the complexity of time series. It not only overcomes the drawback of sample entropy,but also can suppress the noise and interference of vibration signals and improves the precision of sample entropy on each time scale compared with multi-scale entropy. Firstly,we verify the advantage of multiscale local-maximum sample entropy on processing vibration signal through the contrastive analysis of simulation signal. Then,we apply it to feature extraction of hydraulic pump's vibration signal. It can identify different features of a hydraulic pump quite obviously.