后视镜产生风噪声的数值模拟与测量

后视镜产生风噪声的数值模拟与测量(中文7000字,英文4000字)
摘要
    汽车产品开发的高成本和竞争性，使得寻找更便宜和更快的预测车辆性能的方法成为必然。在高性能计算（HPC）和新计算方法方面的持续改进，允许包括风噪声在内的车辆舒适性参数进行数字评估。近日，商用计算流体动力学（CFD）软件PowerFlow被评估了其在预测由汽车两外部后视镜产生的风噪声的准确性。通过对几个镜像配置进行模拟，基于预测的性能选择噪声最小的一个为原型，最终在气动声学风洞中通过对其噪声的测量证明了预测结果。波束形成和直接噪声测量这两种测试方法，在与仿真比较之前被用来和物理数据相对比。比较的结果在仿真与实验方面都建立了信心，并且确认了使用外部噪声测量结果作为内部噪声的替代特性。

Numerical Simulations and Measurement
of Mirror-Induced Wind Noise
ABSTRACT
The high cost and competitive nature of automotive product development necessitates the search for less expensive and faster methods of predicting vehicle performance. Continual improvements in High Performance Computing (HPC) and new computational schemes allow for the digital evaluation of vehicle comfort parameters including wind noise. Recently, the commercially available Computational Fluid Dynamics (CFD) code PowerFlow, was evaluated for its accuracy in predicting wind noise generated by an external automotive tow mirror. This was accomplished by running simulations of several mirror configurations,choosing the quietest mirror based on the predicted performance, prototyping it, and finally, confirming the prediction with noise measurements taken in an aeroacoustic wind tunnel. Two testing methods, beamforming and direct noise measurements, were employed to correlate the physical data with itself before correlating with simulation. Results of the correlations build confidence in both simulation and experiment, and confirm the use of exterior noise measurements as a substitute characteristic for interior noise.