提出一种由多层负刚度余弦形曲梁连接构成的新型高性能舰船设备冲击防护装置，其抗冲击机理是基于两端刚性固定余弦形曲梁横向压载下的非线性力学特性。给出了余弦形曲梁横向压载下力-位移关系解析表达式。建立了针对余弦形曲梁几何参数的优化模型，对最优解进行有限元分析并与解析解进行了比较。建立多层双余弦梁负刚度结构与船体板架的有限元模型，利用显式瞬态分析方法对该系统在三折线冲击谱冲击载荷下的响应进行了分析，探讨层数及安装方式对装置抗冲性能的影响。结果表明：所提出的冲击隔离装置性能优良；随着负刚度梁层数的增多，抗冲击性能增强；层数相同时，将一定长度的该结构分离为两部分安装，抗冲击性能更佳。本文研究成果可指导负刚度抗冲击结构的设计，具有实际意义。
Abstract
A novel high-performance ship equipment impact-resistance device was proposed based on the NS (negative stiffness) properties of the cosine-shaped curved beams with fixed ends when they were pushed at the center.The formulas of the dimensional relationship between the force and displacement were given.According to the theoretical formulas, the optimization model of beam geometric parameters was established, and the finite element analysis was carried out, then solutions were compared between the FEA and the formulas.The finite element mesh of the multilayer NS structure and the deck grillage was modelled and the response of the system under dual-sinusoid impact load was analyzed within an explicit transient analysis step.The influence of the layer number and the installation method on shock isolation was studied.The results show that the acceleration, velocity and displacement are obviously reduced after the transmission of the shock isolation system.With the layer number increasing, the impact resistance is enhanced.With same layer numbers, the model which is separated in the length into two parts is of better shock isolation performance.The results of this study can guide the design of the NS shock isolation structure, which is of practical significance.
关键词
负刚度 /
多层结构 /
抗冲击 /
优化 /
瞬态分析
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Key words
negative stiffness /
multilayer structure /
shock isolation /
optimization /
transient analysis
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参考文献
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