Abstract
The outside rear-view mirror (OSRVM) is installed on the vehicle’s surface, which causes unwanted aerodynamic noise and wind drag during driving. It is important to use simulation methods to predict the performance of aerodynamic noise and wind drag of commercial vehicles due to the OSRVM. Considering the wind drag of the OSRVM, a combinational simulation strategy is employed to calculate external flow and interior acoustic fields of commercial vehicles, respectively. The flow field is computed a priori with an incompressible flow solver. The acoustic field was then computed based on the information extracted from the CFD solver. To obtain the interior noise level at the driver’s ears, a vibroacoustic model is used to calculate the response of the window glass structure and interior cavities, where the unsteady aerodynamic pressure loading on the two side windows’ surface is treated as the acoustic source field. The paper provides flow field and acoustic simulations for three OSRVM configuration models. The results are compared to data obtained in road sliding test measurement on the commercial vehicle. The accuracy of the hybrid simulation method is proved, and the comparative analyses verify that the OSRVM B model dramatically reduces the interior noise and wind drag of commercial vehicles.
Highlights
Academic Editor: Hong-Jun Zhu e outside rear-view mirror (OSRVM) is installed on the vehicle’s surface, which causes unwanted aerodynamic noise and wind drag during driving
To obtain the interior noise level at the driver’s ears, a vibroacoustic model is used to calculate the response of the window glass structure and interior cavities, where the unsteady aerodynamic pressure loading on the two side windows’ surface is treated as the acoustic source field. e paper provides flow field and acoustic simulations for three OSRVM configuration models. e results are compared to data obtained in road sliding test measurement on the commercial vehicle. e accuracy of the hybrid simulation method is proved, and the comparative analyses verify that the OSRVM B model dramatically reduces the interior noise and wind drag of commercial vehicles
A simulation methodology is presented in order to predict the interior acoustic field in the commercial vehicle cab generated by the outside rear-view mirror. e methodology relies on a hybrid aeroacoustic strategy, where the sound source field is obtained from unsteady surface pressure extracted on two side windows from an incompressible computational fluid dynamics (CFD) solution by STAR-CCM+. e acoustic field is solved with the surface dipole approach in the FEMAO framework of LMS Virtual.Lab
Summary
Considering the wind drag of the OSRVM, a combinational simulation strategy is employed to calculate external flow and interior acoustic fields of commercial vehicles, respectively. Schell and Cotoni [4] combined CFD with the acoustic wave equation to propose the air-vibration-acoustic simulation method to predict the sound pressure level in the cab, and the sound pressure level near the driver’s ear was obtained by incompressible unsteady flow excitation It did not consider the effects of different rear-view mirrors on the interior noise and the effects of wind drag for the whole vehicle. Ere is little research on reducing the aerodynamic noise and wind drag by studying the modeling factors of the rear-view mirror for commercial vehicles. Z C d × A is the power consumption factor, Cross-section position (a)
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