无界域中CAD集成振动声学问题的分区协同仿真
Partitioned Co-Simulation for CAD-integrated Vibroacoustic Problems in Unbounded Domains
- Technical University of Munich（慕尼黑工业大学）
- KU Leuven（荷语鲁汶大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
提出一种分区协同仿真框架，耦合IBRA结构与IGA-BEM声学求解器，扩展复值收敛加速器，实现无界域CAD集成振动声学分析的精确鲁棒耦合。
AI中文摘要：
振动声学分析通常需要基于不同数值公式和离散化方法耦合结构和声学求解器，这使得整体式实现具有侵入性，并限制了软件的模块化和重用性。本工作提出了一种用于外部振动声学分析的分区协同仿真框架，该框架将等几何边界表示分析（IBRA）结构求解器与等几何边界元法（IGA-BEM）声学求解器耦合。该方法直接作用于计算机辅助设计（CAD）边界表示，在整个分析过程中保持精确几何，并支持非一致离散化之间的弱耦合和强耦合。一个关键贡献是将Aitken动态松弛和接口拟牛顿逆最小二乘（IQN-ILS）收敛加速器扩展到复值接口量，使耦合迭代能够直接考虑幅度和相位信息。该方法通过涉及薄壳结构和外部声学域的单向和双向耦合振动声学基准问题进行验证。结果表明，与整体式参考解高度一致，同时所提出的复值收敛加速器在不牺牲求解精度的前提下，提高了强耦合求解过程的鲁棒性和收敛行为。这些结果证明，所提出的方法为CAD集成的频域振动声学分析提供了一种准确、鲁棒且模块化的途径。
英文摘要：
Vibroacoustic analysis often requires coupling structural and acoustic solvers based on different numerical formulations and discretizations, making monolithic implementations intrusive and limiting software modularity and reuse. This work presents a partitioned co-simulation framework for exterior vibroacoustic analysis that couples an Isogeometric boundary representation analysis (IBRA) structural solver with an isogeometric boundary element method (IGA-BEM) acoustic solver. The methodology operates directly on the computer-aided design (CAD) boundary representation, preserving the exact geometry throughout the analysis and supporting both weak and strong coupling between non-conforming discretizations. A key contribution is the extension of the Aitken dynamic relaxation and Interface Quasi-Newton with Inverse Least-Squares (IQN-ILS) convergence accelerators to complex-valued interface quantities, allowing the coupling iterations to account directly for both amplitude and phase information. The approach is validated using one-way and two-way coupled vibroacoustic benchmark problems involving thin-shell structures and exterior acoustic domains. The results show excellent agreement with monolithic reference solutions, while the proposed complex-valued convergence accelerators improve the robustness and convergence behavior of the strongly coupled solution procedure without compromising solution accuracy. These results demonstrate that the proposed approach provides an accurate, robust, and modular approach for CAD-integrated frequency-domain vibroacoustic analysis.
