Numerical modeling of dual-pulse shock test machine for simulating underwater explosion shock loads on warship equipments |
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Authors: | Zhi-yi Zhang 틪 Gong-xian Wang Yu Wang |
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Affiliation: | (1) Institute of Vibration Shock and Noise, Shanghai Jiaotong University, Shanghai, 200240, China;(2) School of Logistics Engineering, Wuhan University of Technology, Wuhan, 430063, China;(3) Naval Arming Academy, Beijing, 100073, China |
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Abstract: | In order to qualify shock resistance performance of shipboard equipments and simulate real underwater explosion environment, a novel dual-puise shock test machine is proposed. The new machine will increase testing capability and meet special shock testing requirement. Two key parts of the machine, the velocity generator and the shock pulse regulator, play an important role in producing the positive acceleration pulse and the succeeding negative acceleration pulse, respectively. The generated dual-pulse shock for test articles is in conformity with an anti-shock test specification. Based on the impact theory, a nonlinear dynamic model of the hydraulically-actuated test machine is established with thorough analysis on its mechanism that involves conversion of gas potential energy and dissipation of kinetic energy. Simulation results have demonstrated that the proposed machine is able to produce a double-pulse acceleration shock in the time domain or a desired shock response spectrum in the frequency domain, which sets up a base for the construction of the machine. |
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Keywords: | shock test machine underwater explosion (UNDEX) velocity generator shock pulse regulator |
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