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水下非接触爆炸下船舶损伤模式研究
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摘要
随着科学技术的发展,高爆、非接触水下爆炸对船舶设备造成的冲击振动损伤越来越大,对船舶及其设备在水下非接触爆炸下的振动响应进行分析有助于深入研究船舶设备的在受到爆炸影响下的损伤模式,为船舶的前期设计、使用维护、性能评估提供良好的数据支撑。
     本文从水下非接触爆炸下船舶设备的冲击振动产生过程——从炸药水下爆炸的物理化学反应,到其产生的冲击通过流固耦合传递到船体并引起船舶设备振动的三个重要环节着手,对船舶受到水下爆炸影响时所涉及的有关问题进行了关键理论的分析与研究。研究了船舶设备受冲击振动的理论计算方法体系,在应用CJ爆轰理论和JWL状态方程对炸药的水下爆炸过程及其效应描述的基础上,分析了ALE流固耦合算法在对水下爆炸产生的冲击波效应和气泡脉动效应施加到船体应用中的有关问题。研究了不同的隔振装置模型,考虑将水下爆炸所导致的传递到具体设备的振动通过加速度来表征,基于设备的加速度响应对设备的损伤阈值进行界定,建立了基于概率的设备损伤度评判准则,同时引入基于损伤概率的损伤模式划分,完成了整个基于水下非接触爆炸下船舶损伤模式的分析。将损伤树分析理论引入船舶损伤模式分析,通过对船舶损伤概率的整体分析,对一定工况下设备损伤对船舶安全的重要度进行了评估。综合应用计算机仿真与虚拟现实有关理论,编程实现了基于损伤树的船舶在水下非接触爆炸下的损伤模式系统软件开发,增强了对一定工况下船舶及其设备损伤度及损伤模式查看和分析的真实感和沉浸感。
With the development of science and technology, The Impact damage and Vibration injury of ship equipment is increasing by high-explosive and non-contact underwater explosion. Analysis ship and its equipment response on shock and vibration under the non-contact underwater explosion, helping to study of the damage mode ship equipment under explosion, and providing a good support to preliminary design for the ship, maintenance and performance evaluation.
     The paper make critical theoretical analysis and research to the shock and vibration generating process of ship and its equipment under the non-contact underwater explosion: from the chemical physics of underwater explosions to the impact of shock passed to the hull through FSI and causing the vibration of ship equipment. The paper study the impact of ship equipment vibration by the theoretical calculation methodology, based on the describing process of underwater explosion with the CJ explosives detonation and JWL equation of state, analysis some questions about ALE fluid-structure interaction algorithm applied to the ship using shock wave and bubble pulse effects which produced by underwater explosion. Research different modes of vibration isolation,consider the vibration caused by underwater explosion is passed to the specific equipment characterized by acceleration,define the damage threshold of equipment based on the acceleration response of ship equipment and establish the probability-based damage degree evaluation criteria, and introduce damage mode based on the damage probability, completed the analysis of ship damage mode under non-contact underwater explosion. Introduce the Methods of damage-tree-analysis to the ship damage mode analysis, though analyzed the probability of ship damage overall, the paper assess an important degree of specific equipment damage to ship safety under certain conditions. Comprehensive application of computer simulation and the theory of virtual reality, the paper program the damage mode assessment system software development based on the damage tree analysis about the ship under underwater non-contact explosion,enhance the sense of realism and immersion on viewing and analysing the ship equipment damage degree and damage mode under certain conditions.
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