Integral Equations Model Reduction For Fast Computation of Nonlinear Periodic Response

11/30/2020
by   Gergely Buza, et al.
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We propose a reformulation for the integral equations approach of Jain, Breunung & Haller [Nonlinear Dyn. 97, 313–341 (2019)] to steady-state response computation for periodically forced nonlinear mechanical systems. This reformulation results in additional speed-up and better convergence. We show that the solutions of the reformulated equations are in one-to-one correspondence with those of the original integral equations and derive conditions under which a collocation type approximation converges to the exact solution in the reformulated setting. Furthermore, we observe that model reduction using a selected set of vibration modes of the linearized system substantially enhances the computational performance. Finally, we discuss an open-source implementation of this approach and demonstrate the gains in computational performance using three examples that also include nonlinear finite-element models.

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