Analysis on impact time-frequency characteristic for underwater self-excitation inspiration pulsed jet device

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (24) : 213-220.

LIU Xin-yang,ZHU An-fu,GAO Chuan-chang,HU Ya-zhou,XIE Ke-yu

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Abstract

The impact experiment of underwater self-excited pulsed jet device was conducted by circulation experiment system of underwater jet. The impact time domain waveform were got. The time-frequency characteristic of impact was extracted by the method of integrating the second generation wavelet with Wigner-Ville distribution. The energy distribution law of impact frequency band was studied in inspiration and non-inspiration conditions, different confined pressure and target distance. The results show that there exists optimal below nozzle diameter that can make the impact time domain characteristic parameters maximizing. The impact energy of device mainly concentrates on low frequency band. Confining pressure, standoff distance and inspiration have large influence on frequency band energy. Inspiration has obvious influence on the impact frequency components, energy density distribution and pulse effect, but confining pressure and standoff distance only have great influence on the impact energy density distribution and pulse effect. The pressure of collision body measuring point reflects the state of energy accumulation and energy release of device, and has corresponding relationship with the impact energy density distribution.

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underwater / self-excitation inspiration / jet / impact / time-frequency characteristic

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LIU Xin-yang,ZHU An-fu,GAO Chuan-chang,HU Ya-zhou,XIE Ke-yu. Analysis on impact time-frequency characteristic for underwater self-excitation inspiration pulsed jet device[J]. Journal of Vibration and Shock, 2016, 35(24): 213-220

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