119 円形ランド付加による半球殻型構造物の音響放射パワー最小化 : 重量増加なしの構造最適化(サイレント工学III:騒音低減化手法)(OS.04 : サイレント工学)

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There are many methods to reduce car interior noises, for instance, to increase the rigidity of noise source parts, adding damping or sound absorbing materials, or active noise control. These methods, however, lead to the increase of car weight, unfortunately. Improvement of care interior noises should hence be tried without the increase of car weight in order to satisfy two opposite demands, namely, both the demand to reduce car weight for good fuel consumption and the demand to increase care weight for improve car interior quietness. The authors have been investigated numerically the addition and optimization of lib to reduce the sound radiation power of a hemispherical structure, which is a simple model of a lid of transmission case for automobile, under the assumption that the hemispherical structure is excited inside near the apex. As the result, 9dB was reduced by optimizing the circular land, which is an alternative of lib. But, for this case, the wieght increase of 10% was allowed. In this paper, the circular land was optimized reducing the thickness of hemispherical part in order to keep the weight of hemispherical structure with the circular land. As the result, 7.5dB was reduced by optimizing the circular land for the case that the thickness of hemispherical part was 4.5mm. Experiments using the hemispherical structures with and without the optimized circular land showed that the estimated reduction of sound radiation power almost coincided with the experimental values.
一般社団法人日本機械学会の論文
2001-08-03

119 円形ランド付加による半球殻型構造物の音響放射パワー最小化 : 重量増加なしの構造最適化(サイレント工学III:騒音低減化手法)(OS.04 : サイレント工学)

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