Vibration Characteristics Analysis of Composite Double-Layer Explosive Vessel Shell Subjected to Explosion Loading

Quan Wang,Yangfan Cheng,Shanghao Liu,Chi-Min Shu,Zhimin Li,Jie Gong,Xuejiao Li

doi:10.1155/2018/3714798

Abstract

Explosive vessels are vulnerable to shock wave impacts during operation processing. It is necessary to explore the vessel’s vibration characteristics. In this paper, acceleration sensors were adopted to collect vibration acceleration signals at the inner and outer surfaces of the composite double-layer explosive vessel under explosive loading. Then, the effective vibration velocity curve can be obtained by fitting polynomials to eliminate the acceleration integral trend. Thereafter, Hilbert-Huang Transform (HHT) was applied to analyze the time-frequency distribution of vibration velocity signals. The results showed that the special “steel plate–buffer interlayer–steel plate” structure can effectively attenuate the explosion vibration effect, and the frequency distribution range of vibration signal at the inner surface was wider than that at the outer surface, and furthermore the main vibration frequency was close to the natural frequency at the inner surface. Meanwhile, vibration amplitude and the main vibration frequency decreased obviously compared with the outer surface, and the vibration time of 0–200 Hz low-order frequency was shortened. The above researches closely linked the energy distribution with frequency of vibration signals and provided valuable reference for safer protection and vibration reduction design of explosive vessel.

Highlights

Explosive vessel is a type of special internal high-pressure antiknock container, which can effectively restrain the shock wave produced by explosions and limit the range of detonation products and fragments
The peak value of vibration acceleration at the inner surface was obviously higher than that of the outer surface, which is mainly attributed to composite structure of the explosive vessel; that is, there existed buffer material between the inner wall and the outer wall
The Hilbert-Huang Transform (HHT) analysis method can effectively obtain the IMF components with definite physical meaning; the energy distribution and change regulation of vibration signals were analyzed from two aspects of vibration action time and frequency distribution, so as to better evaluate the safety of explosive vessel

Summary

Introduction

Explosive vessel is a type of special internal high-pressure antiknock container, which can effectively restrain the shock wave produced by explosions and limit the range of detonation products and fragments. It can provide safer protection for personnel and the surrounding experimental instruments, which are essential experimental equipment for explosion testing [1, 2]. The cylinder shell of explosive vessel may be subject to strong vibration and shock during application; the structural stability and antiknock performance are weakened . Based on the achievements of Kambouchev’s research, Vaziri and Hutchinson [10] studied the role of fluid-structure interaction in the design and assessment of sandwich plates subject to shocks. Spectrum analysis can analyze the vibration signals of explosive vessel from two

Objectives

Results

Conclusion