Abstract
The outside rear view mirror (OSRVM) is installed on the exterior of vehicles to secure the side and rear views of the vehicle, but its extruded design causes unwanted aerodynamic noise and vibration during driving. In this study, additional line holes (inner dents) are made on the inner and outer edges of the mirror housing without a reduction in size in order to enhance the aerodynamic flow and noise around the mirror. Based on computational fluid dynamics (CFD) analysis, this study compares the aerodynamic characteristics of the original and modified mirror models. The comparative analyses verify that the proposed OSRVM model with the inner ducts dramatically improves the velocity profiles and sound pressure levels.
Highlights
Since noise, vibration and harshness (NVH) are significant in passenger vehicles, automotive industries are interested in levels of NVH as a component of the development of comfortable vehicles
The second OSRVM model is designed by adding a duct outside the mirror housing, as shown in Figure 1d, which is normally used in commercial vehicles for improving the aerodynamic flow
The value and region of aerodynamic flow rate and sound pressure level rapidly increase while the driving speed changes from 60 kph to 110 kph
Summary
Vibration and harshness (NVH) are significant in passenger vehicles, automotive industries are interested in levels of NVH as a component of the development of comfortable vehicles. Aerodynamic sound is the predominant component of interior vehicle noise at speeds above 100 kph [1]. Various design technologies have been developed in order to reduce the aerodynamic noises induced by high-speed driving. The design modification of the mechanical components interacting with airflow is needed for the reduction of aerodynamic noise. The bluff body of the mirror interacts with high-speed airflow, causing flow separation, recirculation, and an irregular vortex. The protruding mirror generates strong pressure fluctuation on the door panels and windows, and the unsteady air pressure propagates into the vehicle interior as noise [2]. The side view mirror is known to increase the total amount of drag by 2~7% [3]
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