负压条件下爆炸罐内爆炸引起筒体振动及噪声特性

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (6) : 135-139.

论文

汪泉1,2，林朝键1，李志敏3，陆军伟1，李瑞1，2

作者信息 +

Vibration and noise characteristics of a cylinder body caused by the explosion in an explosion tank under negative pressure

WANG Quan1,2，LIN Chaojian1，LI Zhimin3，LU Junwei1，LI Rui1,2

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文章历史 +

摘要

为了研究负压条件下容器内爆炸引起的振动及噪声特性，研制一套34.8 L抽真空爆炸罐装置。实验用单发8号工业雷管作为爆炸源，采用NuBox8016型爆破振动测试仪、SZ4A型噪声振动测试仪分别测试筒体振动速度及爆炸噪声声压级，并使用快速傅里叶变换(fast Fourier transform ，FFT)以及经验模态分解(empirical mode decomposition ，EMD)方法对振动信号进行分析。结果表明,随着真空度的提高，筒体峰值振动速度、爆炸噪声声压级均呈下降趋势。当筒体内真空压力为-99 kPa时，爆炸产生的有害效应得到有效衰减，与常压条件相比，峰值振动速度衰减70.0%，最大噪声声压级降低18.3%。通过FFT变换及EMD分解，发现筒体主振频率随着真空度提高，主振频率也随之提高，高贡献率的imf分量个数呈现增多趋势。该实验结果与分析对探究负压条件下爆炸振动及其噪声信号衰减规律，以及真空爆炸工程应用等具有重要指导意义。

Abstract

In order to study the vibration and noise characteristics caused by the explosion inside a vessel under negative pressure, a set of 34.8 L vacuum-pumped explosive vessel devices was developed.A single industrial detonator No.8 was used as the explosion source in the experiments, and the vibration velocity and the sound pressure level of explosion noise were measured by a NuBox8016 blasting vibration tester and a SZ4A noise vibration tester respectively.The vibration signal was analyzed by the fast Fourier transform(FFT) and empirical mode decomposition(EMD) method.The results show that with the increase of vacuum degree, the peak vibration speed of the cylinder and the sound pressure level of explosion noise all show a downward trend.When the vacuum pressure in the cylinder is -99 kPa, the harmful effects of explosions are effectively attenuated.Compared with the normal pressure condition, the peak vibration speed is attenuated by 70%, and the maximum noise sound pressure level is reduced by 18.3%.According to the FFT and EMD results, the main vibration frequency of the cylinder increases with the increase of vacuum degree, and the number of IMF components with high contribution rate increases.The test and analysis results have guiding significance for exploring the explosion vibration and attenuating its noise signal under negative pressure, as well as for extending the engineering the application of vacuum explosions.

导出引用

汪泉1,2，林朝键1，李志敏3，陆军伟1，李瑞1，2. 负压条件下爆炸罐内爆炸引起筒体振动及噪声特性[J]. 振动与冲击, 2021, 40(6): 135-139

WANG Quan1,2，LIN Chaojian1，LI Zhimin3，LU Junwei1，LI Rui1,2. Vibration and noise characteristics of a cylinder body caused by the explosion in an explosion tank under negative pressure[J]. Journal of Vibration and Shock, 2021, 40(6): 135-139

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