Equivalent method for frequency division of complicated impact signal Min Guo^{1}, Xin Cao^{2}, Chaowei Li^{3}, Rui Gao^{4}, Shili Li^{5}, Wenbin Du^{6} Northwest Institute of Mechanical and Electrical Engineering, 712099, Xianyang, P. R. China ^{2}Corresponding author E-mail: ^{1}gqpainpian202@163.com, ^{2}cx850129@163.com, ^{3}lizyuan@163.com, ^{4}16753484@qq.com, ^{5}rob.haha@163.com, ^{6}alen_dwb@163.com
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. References [1] Tu Yaqing, Yang Huiyue, Zhang Haitao, Xiao Wei Study on frequency estimation methods and application for complicated signals. Journal of Logistical Engineering University, Vol. 31, Issue 6, 2015, p. 1‑9. [2] Sun Mingqi A simple calculation method for RMS of power spectral density in random vibration. Proceedings of the Academic Conference on Electronic Mechanical and Microwave Structures and Processes, Vol. 8, 2014, p. 109‑111. [3] Li Debao, Lu Qiuhai Engineering Vibration Test Analysis. Tsinghua University press, Beijing, 2004. [4] Chen Xiaohui, Yan Bing, Li Chaohua Research on time domain synthesis algorithm of shock response spectrum. Packaging Engineering, Vol. 28, Issue 2, 2007, p. 24‑25. Cite this articleGuo Min, Cao Xin, Li Chaowei, Gao Rui, Li Shili, Du Wenbin Equivalent method for frequency division of complicated impact signal. Vibroengineering PROCEDIA, Vol. 14, 2017, p. 324‑327.
© JVE International Ltd. Vibroengineering PROCEDIA. Oct 2017, Vol. 14. ISSN 2345-0533 |