Signal Analysis and Waveform Reconstruction of Shock Waves Generated by Underwater Electrical Wire Explosions with Piezoelectric Pressure ProbesReport as inadecuate




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State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China





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Academic Editor: Debbie G. Senesky

Abstract Underwater shock waves SWs generated by underwater electrical wire explosions UEWEs have been widely studied and applied. Precise measurement of this kind of SWs is important, but very difficult to accomplish due to their high peak pressure, steep rising edge and very short pulse width on the order of tens of μs. This paper aims to analyze the signals obtained by two kinds of commercial piezoelectric pressure probes, and reconstruct the correct pressure waveform from the distorted one measured by the pressure probes. It is found that both PCB138 and Müller-plate probes can be used to measure the relative SW pressure value because of their good uniformities and linearities, but none of them can obtain precise SW waveforms. In order to approach to the real SW signal better, we propose a new multi-exponential pressure waveform model, which has considered the faster pressure decay at the early stage and the slower pressure decay in longer times. Based on this model and the energy conservation law, the pressure waveform obtained by the PCB138 probe has been reconstructed, and the reconstruction accuracy has been verified by the signals obtained by the Müller-plate probe. Reconstruction results show that the measured SW peak pressures are smaller than the real signal. The waveform reconstruction method is both reasonable and reliable. View Full-Text

Keywords: shock wave measurement; pressure waveform reconstruction; PCB138 series pressure probe; Müller-plate needle hydrophone; incident angle; time of flight TOF method; FFT shock wave measurement; pressure waveform reconstruction; PCB138 series pressure probe; Müller-plate needle hydrophone; incident angle; time of flight TOF method; FFT





Author: Haibin Zhou, Yongmin Zhang, Ruoyu Han, Yan Jing, Jiawei Wu, Qiaojue Liu, Weidong Ding * and Aici Qiu

Source: http://mdpi.com/



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