3 papers
physics.app-ph2025
Topology optimization of isotropic viscoelastic microstructures based on periodic homogenization
Hiroaki Deguchi, Kei Matsushima, Takayuki Yamada
Mitigating low-frequency noise is particularly challenging due to its limited natural attenuation. This study aims to design viscoelastic composite microstructures that achieve bot…
math-ph2025
Exceptional points and defective resonances in an acoustic scattering system with sound-hard obstacles
Kei Matsushima, Takayuki Yamada
This paper is concerned with non-Hermitian degeneracy and exceptional points associated with resonances in an acoustic scattering problem with sound-hard obstacles. The aim is to f…
physics.class-ph2024
Observation of exceptional points in a spherical open elastic system
Hiroaki Deguchi, Kei Matsushima, Takayuki Yamada
Exceptional points (EPs) are spectral singularities in non-Hermitian systems where eigenvalues and their corresponding eigenstates coalesce simultaneously. In this study, we calcul…