An Explicit Integration Finite Element Method for Impact Noise Generation at a Squat

January 1, 2015 in

Journal Paper

Zhen Yang
Zili Li
Rolf Dollevoet

DOI 10.1007/978-3-662-44832-8_9


Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Volume 126, Pages 63-70

Publisher: Springer Berlin Heidelberg
Publishing date: January 1, 2015

explict FEM, impact noise, squat

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This paper presents a full finite element (FE) interaction model of wheel-track to study the wheel-rail impact noise caused by a squat. The wheel, the rail and some other track components are modeled with finite elements in three dimensions, where necessary and appropriate. Realistic contact geometry, including geometric irregularity (squat) in the contact surfaces is considered. The integration is performed in the time domain with an explicit central difference scheme. For convergence, the Courant time step condition is enforced, which, together with the detailed modeling of the structure and continuum of the wheel-track system, effectively guarantees that vibration frequency of 10 kHz or higher is reproduced. By making use of the calculated velocities and pressures on the vibrating surfaces, the boundary element method (BEM) based on Helmholtz equation is adopted to transform the vibrations of the track into acoustic signals.