TY - GEN
T1 - Aero-acoustics of vehicle side mirrors
AU - Sabuncu, Ahmet Can
AU - Aslan, Alim Rüstem
PY - 2007
Y1 - 2007
N2 - The dominating noise of a ground vehicle traveling at speeds above 120 km/h is generated by the aerodynamic mechanisms. The main noise sources of such a ground vehicle are front pillar, under body, side mirror and ventilation channels. In this paper, the unsteady flow field around two different side mirrors, namely those of Renault 9-Broadway and Volvo S 40, and their contribution to the noise propagation are investigated. The CAD data of the side mirrors is generated using a three-dimensional digitizer. A Commercial software package's Non Linear Acoustics Solver is used to predict the radiated sound from the side mirrors. First, average turbulence properties are determined using RANS computations. Then, for the acoustic analysis initial RANS mesh is cropped closer to mirror to construct the acoustic mesh. At the cropped boundaries the far-field absorbing boundary conditions are used to prevent acoustic wave reflections. Sound pressure levels are determined in four locations. Overall, the newer Volvo S40 mirror gave lower sound pressure levels.
AB - The dominating noise of a ground vehicle traveling at speeds above 120 km/h is generated by the aerodynamic mechanisms. The main noise sources of such a ground vehicle are front pillar, under body, side mirror and ventilation channels. In this paper, the unsteady flow field around two different side mirrors, namely those of Renault 9-Broadway and Volvo S 40, and their contribution to the noise propagation are investigated. The CAD data of the side mirrors is generated using a three-dimensional digitizer. A Commercial software package's Non Linear Acoustics Solver is used to predict the radiated sound from the side mirrors. First, average turbulence properties are determined using RANS computations. Then, for the acoustic analysis initial RANS mesh is cropped closer to mirror to construct the acoustic mesh. At the cropped boundaries the far-field absorbing boundary conditions are used to prevent acoustic wave reflections. Sound pressure levels are determined in four locations. Overall, the newer Volvo S40 mirror gave lower sound pressure levels.
UR - http://www.scopus.com/inward/record.url?scp=84873970788&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84873970788
SN - 9781605603858
T3 - Turkish Acoustical Society - 36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007 ISTANBUL
SP - 699
EP - 712
BT - Turkish Acoustical Society - 36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007 ISTANBUL
T2 - 36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007
Y2 - 28 August 2007 through 31 August 2007
ER -