52 citations · 101 across the 10 of their papers we have counts for
6 papers · 1 filter
A topology optimization of open acoustic waveguides based on a scattering matrix method
Kei Matsushima, Hiroshi Isakari, Toru Takahashi +1
This study presents a topology optimization scheme for realizing a bound state in the continuum along an open acoustic waveguide comprising a periodic array of elastic materials. F…
An enhancement of the fast time-domain boundary element method for the three-dimensional wave equation
Toru Takahashi, Masaki Tanigawa, Naoya Miyazawa
Our objective is to stabilise and accelerate the time-domain boundary element method (TDBEM) for the three-dimensional wave equation. To overcome the potential time instability, we…
A shape optimisation with the isogeometric boundary element method and adjoint variable method for the three-dimensional Helmholtz equation
Toru Takahashi, Daisuke Sato, Hiroshi Isakari +1
This paper presents a shape optimisation system to design the shape of an acoustically-hard object in the three-dimensional open space. Boundary element method (BEM) is suitable to…
An isogeometric boundary element method for three-dimensional doubly-periodic layered structures in electromagnetics
Toru Takahashi, Tetsuro Hirai, Hiroshi Isakari +1
This paper proposes an isogeometric boundary element method (IGBEM) to solve the electromagnetic scattering problems for three-dimensional doubly-periodic multi-layered structures.…
A fast topology optimisation for material- and geometry-independent cloaking devices with the BEM and the -matrix method
Kenta Nakamoto, Hiroshi Isakari, Toru Takahashi +1
We show a design method of cloaking devices which work for target objects with arbitrary shape and material by a topology optimisation with an accurate and efficient sensitivity an…
A level-set-based topology optimisation for acoustic-elastic coupled problems with a fast BEM-FEM solver
Hiroshi Isakari, Toyohiro Kondo, Toru Takahashi +1
This paper presents a structural optimisation method in three-dimensional acoustic-elastic coupled problems. The proposed optimisation method finds an optimal allocation of elastic…