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.

中文翻译：

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商用车外部后视镜产生的内部噪声和风阻的预测和空气动力学分析

外部后视镜（OSRVM）安装在车辆表面上，这会在驾驶过程中引起不必要的空气动力噪声和风阻。使用仿真方法来预测由于OSRVM引起的商用车的空气动力噪声和风阻性能非常重要。考虑到OSRVM的风阻，采用组合仿真策略分别计算商用车的外部流场和内部声场。用不可压缩的流量求解器先验地计算流场。然后根据从CFD求解器中提取的信息计算声场。为了获得驾驶员耳朵的内部噪音水平，我们使用振动声学模型来计算车窗玻璃结构和内部空腔的响应，将两个侧窗玻璃表面上不稳定的空气动力压力视为声源场。本文提供了三种OSRVM配置模型的流场和声学模拟。将结果与在商用车辆的道路滑行测试测量中获得的数据进行比较。证明了混合仿真方法的准确性，并通过比较分析证明了OSRVM B模型可以大大降低商用车的内部噪声和风阻。