抄録
In order to reproduce the real driving condition of an automobile in the laboratory, the door mirror noise of the automobile was estimated by the wind tunnel test giving the uniform flow. Moreover, the scale model of the door mirror was analyzed by the wind tunnel for clarifying the relationship between the flow field around the door mirror and the aerodynamic noise. In particular, we discussed the low frequency narrow band noise and the flow field around the door mirror because the noise was 10dB larger than the background noise in the real automobile wind tunnel test. The experimental results indicated that when the clearance between the base and the visor of the door mirror is changed it influenced to the noise level in the low frequency domain. The noise level was increased due to the width of the wake when the clearance between the base and the visor was increased. From above results, we could grasp the phenomena about the narrow band noise in the vicinity of the 300 Hz generated from the actual automobile door mirror as it caused by the vortex shedding from the base.
