Instantaneous impact force decomposition of underwater self-excited inspiration pulse jet device

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (24) : 227-234.

YU Xiaolong1,2, LIU Xinyang2, XU Hongzeng1, CHEN Hao2, WANG Shunsheng2, GAO Chuanchang2

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Abstract

In order to study the time-varying impact and fluctuation impact force in the instantaneous impact force of the underwater self-excited inspiration pulsed jet device, discrete orthogonal wavelet transform and EMD were used to denoise and decompose for the instantaneous impact force of the device.The wavelet basis function and the number of decomposition layers for the wavelet transform and the number of intrinsic mode functions (IMF) for EMD were determined for time-varying impact force extraction.The influence of confining pressure on the pulsed amplitude and pulsed period of the time-varying impact and the fluctuation strength of fluctuation impact were analyzed.The results show that under different confining pressure, the discrete orthogonal wavelet transform is better than EMD in extracting the time-varying impact force, but the choice of wavelet basis function needs to consider the variation characteristics of instantaneous impact force under different confining pressure.Confining pressure has little effect on the pulsed period of the time-varying impact force after the device inspiration, but it has a great influence on the pulsed amplitude.Confining pressure and inspiration have a great influence on the time-varying value of the instantaneous impact force and the fluctuation strength of the fluctuation impact force, but the influence of the inspiration on the two is different under different confining pressure.

Key words

underwater / self-excited inspiration / pulsed jet / instantaneous impact force / discrete orthogonal wavelet transform / empirical mode decomposition(EMD)

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YU Xiaolong1,2, LIU Xinyang2, XU Hongzeng1, CHEN Hao2, WANG Shunsheng2, GAO Chuanchang2. Instantaneous impact force decomposition of underwater self-excited inspiration pulse jet device[J]. Journal of Vibration and Shock, 2019, 38(24): 227-234

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