Noritoshi Nakagawa

TL;DR: In this paper, a muffler with an interconnecting hole on the tail pipe was proposed to improve the low-pass filter attenuation performance of low frequency and middle frequency.

TL;DR: In this paper, the tail pipe noise from a commercial automotive muffler was studied experimentally and numerically under the condition of wide open throttle acceleration in the present research, and the results of simulation are in good agreement with experimental results at the 2nd order of the engine rotational frequency.

TL;DR: In this article, a micro-perforated membrane (MPM) absorber is designed as a combination of baffle-resonator and Helmholtz resonance with sub-millimeter holes backed by an air space.

TL;DR: In this article, the authors investigated the noise transmission characteristics of an elastically supported sandwich polycarbonate window pane into a rectangular cavity using a modal analysis combination with compact matrix formulation and found that an improvement in noise reduction can be realized by the appropriate selection of structural parameters such as the damping of core, density of viscoelastic core material and thickness of the face plate.

TL;DR: In this article, a new ultra-thin (less than 10mm) sandwich pane is proposed to obtain high transmission loss (TL) using decoupled equations representing symmetric and anti-symmetric motions for a sandwich PC pane.