Transient response of a submerged fluid‐coupled double‐walled shell structure to a pressure pulse
Transient response of a submerged fluid‐coupled double‐walled shell structure to a pressure pulse
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DOI：
10.1121/1.387197
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发表时间：
1981-12
影响因子：
2.4
通讯作者：
H. C. Neilson;G. C. Everstine;Y. F. Wang
中科院分区：
文献类型：
--
作者：
H. C. Neilson;G. C. Everstine;Y. F. Wang
利用通用结构有限元分析程序nastran，采用双渐近逼近法（DAA）计算外表面相互作用载荷，采用明确建模的流体有限元法计算壁间耦合，给出了淹没在壁间的双壁弹性球对平面阶跃压力脉冲的交互瞬态响应解。本文描述了所使用的方法，讨论了在实施过程中遇到的问题，以及克服这些问题的方法。结果与相同配置的可用精确解进行了比较，并与作为独立淹没结构的内壳的精确和近似解进行了比较。比较结果令人满意，验证了这些方法对沉水双壁结构的适用性。此外，双壳与单壳的比较表明，通过在结构模型中加入与外表面相邻的几层流体有限元，并在该流体包膜的外表面施加DAA载荷，可以提高单壁水下结构的有限元/DAA计算的后期精度。
A solution is presented for the interactive transient response of a submerged double‐walled elastic sphere, flooded between the walls, to a plane step pressure pulse, using the general purpose finite element structural analysis computer program nastran with the doubly asymptotic approximation (DAA) for external surface interaction loading and explicitly modeled fluid finite elements for between‐wall coupling. The methods used are described and problems encountered in implementation are discussed, along with approaches used in overcoming them. Results are compared with an available exact solution for the same configuration, and with exact and approximate solutions for the inner shell as a stand‐alone submerged structure. The comparisons indicate generally satisfactory results, verifying the applicability of these methods for a submerged, double‐walled structure. In addition, the double‐single shell comparisons suggest a hitherto untried means of improving the later‐time accuracy of a finite element/DAA computation for a single‐walled submerged structure by including in the structural model a few layers of fluid finite elements adjacent to the outer surface, and applying the DAA loading at the outer surface of this fluid envelope.