Signal Analysis and Waveform Reconstruction of Shock Waves Generated by Underwater Electrical Wire Explosions with Piezoelectric Pressure Probes.
Signal Analysis and Waveform Reconstruction of Shock Waves Generated by Underwater Electrical Wire Explosions with Piezoelectric Pressure Probes.
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DOI：
10.3390/s16040573
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发表时间：
2016-04-22
期刊：
影响因子：
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通讯作者：
Qiu A
中科院分区：
文献类型：
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作者：
Zhou H;Zhang Y;Han R;Jing Y;Wu J;Liu Q;Ding W;Qiu A
水下电线爆炸产生的水下冲击波得到了广泛的研究和应用。精确测量这种SWs非常重要，但由于其峰值压力高，上升沿陡，脉冲宽度很短（几十μs左右），因此很难实现。本文旨在分析两种商用压电压力探头所获得的信号，并将其测量到的失真压力波形重构为正确的压力波形。研究发现，PCB138和miller -plate探针均具有良好的均匀性和线性性，可用于测量相对SW压力值，但均不能获得精确的SW波形。为了更好地接近真实的SW信号，我们提出了一种新的多指数压力波形模型，该模型考虑了早期压力衰减较快和较长时间压力衰减较慢的特点。基于该模型和能量守恒定律，对PCB138探头获得的压力波形进行了重构，并通过<s:1>勒板探头获得的信号验证了重构的精度。重构结果表明，实测的SW峰值压力小于实际信号。波形重建方法合理可靠。
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.