Adaptive Isostable Reduction of Nonlinear PDEs With Time Varying Parameters
Adaptive Isostable Reduction of Nonlinear PDEs With Time Varying Parameters
复制标题
具有时变参数的非线性偏微分方程的自适应等稳态约简
DOI:
10.1109/lcsys.2020.3001439
复制
发表时间:
2021
影响因子:
3
通讯作者:
Djouadi, Seddik M.
中科院分区:
文献类型:
--
作者:
Wilson, Dan;Djouadi, Seddik M.
Isostable reduction is a powerful technique for characterizing the transient behavior of a weakly forced, nonlinear dynamical systems in relation to a stable attractor. Practically, this reduction strategy requires small magnitude inputs so that the state remains close to the underlying attractor; when inputs become too large the reduction becomes unusable. Here, we develop an adaptive isostable coordinate framework that is valid for a continuous family of system parameters. Relations are derived that capture changes to the isostable coordinates in response to parameter changes. This information is subsequently used to define a reduction strategy valid for large magnitude but slowly varying inputs. The proposed reduction framework is compared to well-established linear and nonlinear proper orthogonal decomposition (POD) reduction techniques for simulations of the 1-dimensional nonlinear Burgers' equation with time-varying Dirichlet boundary conditions. In numerical simulations the proposed reduction strategy only requires a single mode to accurately capture system behavior. By contrast, the linear POD reduction performs poorly while the nonlinear POD strategy requires several modes to achieve comparable performance.
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DOI:
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