目的 建立爆炸冲击波作用下流固耦合载荷预示公式,形成基于散射场的水下冲击环境下结构响应预示方法。方法 引入场分离技术,构建流固耦合面上冲击波、散射波及结构响应之间的压力、加速度等物理量关系,采用位移-压力耦合格式,建立流固耦合载荷预示公式,形成基于散射场的水下冲击环境下结构响应预示方法。面向无限水域无反射特性,采用比例边界有限元方法建立无限水域无反射边界条件,并实现与该预示方法的集成,可实现对水下冲击波作用下含无限水域的结构响应预示。结果 通过分析水下圆筒二维结构在平面冲击波作用下的结构响应,散射场解与总场解、解析解具有较好的可比性,“大水域”与“小水域”的解结果几乎一致,说明了网格收敛性,也说明了模拟“无限”水域的合理性,所建立方法具有正确性和适用性。结论 冲击波的载荷预示方法有助于模拟无反射边界条件的构建。耦合FEM与SBFEM,可模拟无限水域的能量吸收性。相比总场公式,可避免分析冲击波在无限水域传播过程到达结构表面过程。
Abstract
The work aims to establish a fluid-structure interaction (FSI) load prediction formula under the action of explosive shock waves and develop a scattered field-based structural response prediction method for underwater impact environments. The field separation technique was introduced to construct relationships between pressure and acceleration among shock waves, scattered waves, and structural responses on the FSI interface. A displacement-pressure coupled formulation was adopted to establish the FSI load prediction formula, thereby forming the scattered field-based structural response prediction method for underwater impact scenarios. Targeting the non-reflective characteristic of infinite water domains, the scaled boundary finite element method (SBFEM) was employed to construct non-reflective boundary conditions for infinite water domains which were integrated with the proposed prediction method. This integrated method enabled the prediction of structural responses for systems involving infinite water domains under underwater shock waves. By analyzing the structural response of a two-dimensional underwater cylindrical structure under planar shock waves, the scattered field solution exhibited good consistency with the total field solution and analytical solution. The results obtained from "large water domain" and "small water domain" models were nearly identical, verifying both mesh convergence and the rationality of simulating an "infinite" water domain. The proposed method demonstrated high correctness and applicability. The load prediction method of the shock wave facilitates the construction of non-reflective boundary conditions. The simulation of energy absorption in infinite water domains is conducted by coupling the finite element method (FEM) with SBFEM. Compared with the total field formula, this method avoids analyzing the propagation process of shock waves in infinite water domains before they reach structural surfaces.
关键词
散射场 /
水下结构响应预示方法 /
水下冲击波 /
无限水域 /
比例边界有限元法
Key words
scattered field /
prediction method of underwater structural response /
underwater shock wave /
infinite water domain /
SBFEM
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基金
国家自然科学基金项目面上项目（12472171）; 国家自然科学联合基金项目-NSAF重点基金（U2430201）
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