Study on hybrid LES-LAA method for wind buffeting noise control of vehicle rear windows

摘要

Based on the large eddy simulation (LES) and Lighthill acoustic analogy (LAA) methods, a hybrid simulation technique, so-called LES-LAA, for improving wind buffeting noises generated by opening rear windows of a running vehicle is presented in this article. The wind buffeting noises are simulated by the LES-LAA and experimentally verified. Some factors affecting the wind buffeting noise, such as vehicle speed and window opening scale, are investigated. To decrease the wind buffeting noises, some attempts are made by attaching absorption materials in the compartment and mounting a plexiglass baffle at an appropriate position for reducing wind noise. The results show that the calculation errors on the sound pressure level (SPL) of the LES-LAA are less than 2%. The SPL of wind noise reaches a maximum value at a rear-window opening scale of 42% and is positively correlated to the vehicle speed. The wind buffeting noise of opening windows on both sides is lower than that of opening one. After mounting the baffle, the reduction of interior noise reaches to 27.26 dB. A conclusion is drawn that the proposed LES-LAA method and the buffeting noise control measures are accurate, effective and feasible, which may be directly applied to vehicles and have potential for solving other aeroacoustic engineering problems. (C) 2017 Institute of Noise Control Engineering.