Equivalent method for frequency division of complicated impact signal

Min Guo1, Xin Cao2, Chaowei Li3, Rui Gao4, Shili Li5, Wenbin Du6

Northwest Institute of Mechanical and Electrical Engineering, 712099, Xianyang, P. R. China

2Corresponding author

E-mail: 1gqpainpian202@163.com, 2cx850129@163.com, 3lizyuan@163.com, 416753484@qq.com, 5rob.haha@163.com, 6alen_dwb@163.com

 Received 10 September 2017; accepted 18 September 2017

Abstract. This article describes a method of frequency division equivalent for complicated impact signal. In the complex impact signal analysis and processing, instantaneous frequency often plays an important role, the instantaneous frequency represents the position of the frequency peak with time, complicated impact signal has their instantaneous frequencies at some point. The method first calculates the power spectrum of the original signal, then the power spectral curve is integrated, the mean square value curve of the whole frequency band is obtained, the frequency amplitude curve can be obtained by square of mean square curve. According to the 1 kHz bandwidth, equal intervals are segmented to the frequency axis, the total root mean square values of each frequency band are calculated respectively, the ratio of each component to the total root mean square value of the whole frequency band is the contribution rate of the frequency band to the whole signal amplitude.

Keywords: impact signal, power spectrum, RMS, frequency division.

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