Aeroacoustics Simulation of Talgo’s Running Gear Frame “Rodal”
54º Congreso Español de Acústica — Tecniacústica 2023
Abstract
Talgo trains are immediately recognizable due to their single-axle running gears with independently rotating wheels (a system known as rodal). This characteristic type of running gear facilitates a number of solutions that are difficult to implement in conventional rolling stock, such as a coach floor at the platform level and an automatic variable gauge system. The rolling stock has a direct influence on the train pass-by noise due to its contribution both to rolling and aerodynamic noise. This paper presents a computational procedure to calculate the aerodynamic noise generated at high speed by an inter-coach gap with a rodal. The aerodynamic noise is calculated in two steps: a CFD (Computational Fluid Dynamics) analysis to determine the velocity and pressure fields of the domain followed by a FEM (Finite Element Method) simulation of the flow-induced noise based on the Lighthill’s acoustic analogy. Results are presented for observer positions specified in the ISO EN 3095:2013: “Measurement of noise emitted by railbound vehicles”.