Abstract
As train speed increases, the aerodynamic noise gradually exceeds the wheel-rail noise and becomes the main noise source of high-speed trains. The aerodynamic noise affects the interior environment of a train in two ways: turbulent wall pressure fluctuation (TWPF) and acoustic wall pressure fluctuation (AWPF). In this paper, a hybrid aerodynamic model for noise analysis of high-speed trains based on the computational fluid dynamics (CFD) method and the Lighthill's acoustic analogy (LAA) algorithm, so-called CFD-LAA method, is established and solved by using the finite-element acoustic simulator of Actran software. The noise contributions of both the TWPF and the AWPF are examined and discussed. The method presented in this paper may be a valuable reference for revealing the generation mechanism of aerodynamic noises and evaluating their effects on a train interior noise.