Average vibration reduction effect in low frequency band by initial design using analytical SEA

Abstract

In the automobile industry, quietness has been pursued with electrification and vehicle weight has been reduced for longer traveling distance. In design of component products to be mounted on vehicles, “low noise” and “weight reduction” have been also required. In order to realize them, it is important to approach sound characteristics in initial design stage and detail design stage. In the initial design stage, parts layout, material and rough dimensions are designed to decrease “average” of noise level. In the detail design stage, accurate dimensions and detailed shapes are designed to suppress noise peaks. These are called “two-step design”. Especially, analytical SEA (ASEA) is a suitable technology for the initial design because it provides results by using only theoretical equations without 3-D models. However, it has hurdles to be a practical process. One is a constraint of ASEA that accuracy of results can be kept high only in high frequency range. In this paper, we proved theoretically and practically that initial design using ASEA was effective even in low frequency range.