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arXiv 2512.07366math.NAcs.NAphysics.comp-ph
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非侵入式数据自由参数降阶模型用于几何非线性结构

Non-Intrusive Data-Free Parametric Reduced Order Model for Geometrically Nonlinear Structures

Alexander Saccani, Paolo Tiso

AI总结:

该研究提出一种非侵入式数据自由参数降阶模型,用于高效处理几何非线性结构的参数分析,通过降阶基底和插值方法实现计算效率提升。

摘要:

我们提出了一种完全非侵入式的参数降阶建模(PROM)框架,用于具有几何变化的非线性结构。该方法基于由振动模态和模态导数伴随向量构建的方程驱动的降阶ROMs,而非线性降阶张量则从标准有限元输出中识别。通过一组训练样本生成此类ROMs的数据库,并利用径向基函数(RBFs)对所有降阶算子——包括线性刚度矩阵、二次和三次非线性张量、Rayleigh阻尼参数以及降阶基底——进行插值。通过两级POD压缩结合MAC引导的重新排序策略,获得全局降阶基底,以确保参数的平滑性。所得到的PROM保留了降阶方程的对称性和多项式结构,使其能够稳健且高效地适应新的参数值。分析参数灵敏度直接从插值模型中得出。该方法在具有几何变化的参数弯曲板和翼盒上得到验证,显示与高保真模拟的良好一致,并实现了参数分析计算成本的显著降低。

英文摘要:

We present a fully non-intrusive parametric reduced-order modeling (PROM) framework for geometrically nonlinear structures subject to geometric variations. The method builds upon equation-driven Galerkin ROMs constructed from vibration modes and modal-derivative companion vectors, while nonlinear reduced tensors are identified from standard finite element outputs. A database of such ROMs is generated over a set of training samples, and all reduced operators-including the linear stiffness matrix, the quadratic and cubic nonlinear tensors, the Rayleigh damping parameters, and the reduction basis-are interpolated using Radial Basis Functions (RBFs). A global reduced basis is obtained through a two-level POD compression, combined with a MAC-guided reordering strategy to ensure parametric smoothness. The resulting PROM preserves the symmetry and polynomial structure of the reduced equations, enabling robust and efficient adaptation to new parameter values. Analytical parameter sensitivities follow directly from the interpolation model. The approach is demonstrated on a parametrically curved panel and a wing-box with geometric variations, showing excellent agreement with high-fidelity simulations and enabling substantial reductions in computational cost for parametric analyses.

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