Vehicle Interior Noise Reduction By Developing High Absorption's Seats

Abstract

To reduce noises in vehicles, various means such as (1) improvement of engine-driving system, (2) reinforcement of body-frames, (3) increase of floor-panel's sound-insulation, and (4) increase of interior sound absorption are adopted. In this paper, we consider increase of interior sound absorption to reduce noises in a one-box-car. For this purpose, we first examine the contribution of the interior trim materials to the absorption. We find that the trim materials on the seats have the greatest contribution than those on the other interior parts. We then examine the effects of the seat-cover mocket covering the seat made of urethane-foam. We find that the mocket decreases the absorption. To compensate this decrease, we attempt to develop a new type of mocket. We finally ascertain that using this type of mocket in fact reduces noises.