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Study of the explosion load characteristics and structural response law under a cabin water mist environment: Experimental tests and simulations

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Defence technology 2025年

作者： Li, Xiaobin Zhang, Ya Zhang, Yiheng Huang, Hai Wang, Zhiping Wu, Xingxing Chen, Wei Hubei Defense Science and Technology Key Laboratory of Ship Explosion Damage and Protection Wuhan University of Technology Wuhan430063 China School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Wuhan430063 China China Ship Scientific Research Center Wuxi214082 China

To investigate the explosion load characteristics and structural response law in a water mist environment in a cabin, explosion experiments are carried out. The weakening rates of the initial peak overpressure, quasistatic pressure and structural residual deflection increase with increasing working pressure of the water mist nozzle. Specifically, the weakening rate of the initial peak overpressure ranges from 7.8% to 31.0%, the quasistatic pressure weakening rate ranges from 29.2% to 41.0%, and the weakening rate of the center of the plate residual deflection ranges from 10.8% to 34.4% under the various working pressures of the nozzles. To further explore the effect of water mist explosion suppression, a method for three-dimensional numerical simulations of water mist weakening the explosion shock wave is established to explore the explosion load characteristics of the compartment and the bulkhead response law. On the basis of the dimension analysis method, empirical formulas are derived to predict the residual deflection thickness in the center of the bulkheads. These findings provide the fundamental basis for the application of water mist in anti-explosive protection. © 2025 China Ordnance Society

关键词： Nozzles

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Empirical formulae of predicting ultimate strength for stiffened panels considering included angle under longitudinal compression

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Thin-Walled Structures 2025年 215卷

作者： Song, Zhao Jun Yang, Xin Xu, Ren Jie Liu, Qing Chao Duan, Hao Li, Xiao Bin Hubei Defense Science and Technology Key Laboratory of Ship Explosion Damage and Protection Wuhan China Ministry of Education Wuhan China School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Wuhan China Marine Design and Research Institute of China Shanghai China

Ultimate strength of stiffened panels in ship structures is a fundamental component to resist the vertical hull girder bending moment combined by still water and wave loads. Stiffened panels in deck and bow/stern structures have oblique angle between attached plate and stiffener due to the beam camber and oblique/curved hull plate. Several predominate parameters were investigated in the ultimate strength prediction of stiffened panels by finite element method, such as stiffener type including flange direction in angle bar and included angle. Periodic and symmetric boundary conditions were applied on the 1/2 + 1 + 1/2 bays/spans stiffened panels to simulate adjacent structural constraints effects. It is found that current existing empirical formulae derived from stiffened panels with right angle under longitudinal compression may lead to large errors of ultimate strength under oblique angle conditions, especially for small included angle between attached plate and stiffener. Based on the existing expressions of assessing ultimate strength, the improved empirical formulae with additional reduction expression are proposed for stiffened panels with oblique angle, which could consider the comprehensive influences of included angle, column slenderness and plate slenderness for different stiffener types. © 2025 Elsevier Ltd

关键词： Structural panels

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Low frequency band gap prediction and broadband vibration reduction of multi-scale elastic metabeams with particle damping

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Mechanical Systems and Signal Processing 2025年 235卷

作者： Tianle Xu Yinggang Li Chao Zhang Yufeng Gong Xiaobin Li Key Laboratory of High Performance Ship Technology (Wuhan University of Technology) Ministry of Education Wuhan 430063 P.R. China Departments of Naval Architecture Ocean and Structural Engineering School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Wuhan 430063 P.R. China Defense Science and Technology Key Laboratory of Ship Explosion Damage and Protection of Hubei Province (Wuhan University of Technology) Wuhan 430063 P.R. China Hubei Agricultural Machinery Engineering Research and Design Institute Hubei University of Technology Wuhan 430068 P.R. China China Ship Development and Design Center Wuhan 430064 P.R. China

In this paper, the low-frequency flexural wave band gap and broadband vibration reduction characteristics of multi-scale elastic metabeams with particle damping are theoretically and numerically studied. A band gap theoretical prediction model of multi-scale elastic metabeams with particle damping is established by using the plane wave expansion method combination with the gas-particle two-phase flow theory. Besides, a fully time-domain bidirectional coupling method of the discrete element method (DEM) combination with multi-flexible body dynamics (MFBD) is proposed to investigate the vibration transmission and particle motion as well as energy dissipation characteristics. In addition, the vibration transmission tests of multi-scale elastic metabeams with particle damping were conducted to validate the theoretical prediction model and simulation model. Furthermore, the influence of particle diameter and excitation intensity are investigated. Results show that the band gap theoretical model of multi-scale elastic metabeams with particle damping can accurately and effectively predict the band structure and elastic wave attenuation characteristics. The low frequency broadband vibration suppression can be achieved by coupling the broadband vibration reduction mechanism of particle damping and the low frequency band gap mechanism of the elastic metabeams. The coupling of particle damping and elastic metabeams exhibits three typical stages in vibration suppression: strong positive coupling, negative coupling and weakened positive coupling.

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