Calculation method of the aerodynamic noise around high speed vehicles

The aerodynamic noise around vehicles at high speeds has become increasingly important and in more and more cases dominates the vehicle noise.It is attributable to the facts that the noises from engine, tire, power train and other noise sources have been signiflcantly reduced and the speeds of vehicles constantly increase in the past decades.It is crucial to carry out the study of aerodynamic noise and explore proper countermeasures for suppressing its contribution to the vehicle noise.In this paper, the integral formulations for the calculation of the aerodynamic noise around high speed vehicles is abstained through the solution of generalized Lighthill's equation.After the formulation is analyzed and suitably simplified according to work condition of vehicles, it becomes clear that their aerodynamic noise is dominated by dipole noise and the fluctuating pressure on outside surface of vehicle is main aerodynamic noise source. Some characteristics of aerodynamics noise around vehicles are discussed and tested.