自動車用吸音ダクトの音響解析

抄録

In recent years, the electrification of automobiles has progressed in response to environmental problems, and the number of automobiles equipped with large and large-capacity batteries such as electric vehicles and hybrid vehicles is increasing. These batteries take in air from the passenger compartment using ducts for cooling, but since the cooling fan operates regardless of the running condition, sound may leak to the indoor side through the ducts. In order to reduce these sounds, we examined using a sound absorbing material for the duct. We made four types of test pieces with conventional PP resin, compression felt, and film on the inside and outside of the compression felt, and measured the insertion loss in two ways, one on the opposite side and the other on the outside from the entrance of the duct. The acoustic attenuations were measured. In addition, we will introduce the results of creating and calculating a similar FE model.