Showing papers by "Jakob Søndergaard Jensen published in 2021"
TL;DR: A systematic comparative study of some typical and potential ROMs for solving the broadband frequency response optimization problems is provided, finding that the second-order Krylov subspace with moment-matching Gram–Schmidt orthonormalization and the Second-Order Arnoldi method (SOAR) provides superior accuracy and stability.
25 citations
TL;DR: The results demonstrate that, even though the final topology is strongly dictated by the initial design, modifying the shape allows for a significant improvement of the system behavior.
2 citations
TL;DR: In this article, the periodic distribution of mechanical resonators on a thin plate has been studied to improve panel loudspeakers by exploiting the band gap phenomenon (BG), effectively forbidding vibrational modes in certain frequency ranges.
1 citations
TL;DR: A new fictitious domain model for topology optimization of time-harmonic problems based on a wave to diffusion equation transition is proposed, for which intuitive meaningful designs are obtained with the proposed model unlike the case with a conventional contrast model.
Abstract: A new fictitious domain model for topology optimization of time-harmonic problems based on a wave to diffusion equation transition is proposed. By employing negative values of appropriate material coefficients, a tuneable exponential decay of the field amplitude in the fictitious domains can be obtained, whereas for the conventional model a finite field amplitude is always present. To demonstrate the applicability of the model, we consider two topology optimization problems; a volume minimization problem for acoustic topology optimization for which intuitive meaningful designs are obtained with the proposed model unlike the case with a conventional contrast model. For a structural topology optimization example, the proposed model is shown to remove problematic issues with structural artifacts found for a certain dynamic compliance minimization problem.