The compression wave generatedWagner, S. when a high-speed train enters a tunnel at Mach numbers smaller than 0.4 can be described in good approximation by a linear theory of an inviscid fluid. The wave equation for the acoustic potential becomes the governing equation. It is solved by a three dimensional boundary element method in time domain which forces a vanishing normal component of the velocity at the tunnel wall. It is assumed that the elements are compact in time. This leads to a linear equation in which a special matrix-vector multiplication has to be evaluated for every time-step. The aim is to create a fast methodEhrenfried, K. which sets as few constraints on the geometry as possible but nevertheless gives an accurate description of the wave propagation. In a first step the elements are assumed to be rectangles and an infinitely thin cylindric tube of finite length is taken as the geometry of the tunnel. The train is modeled by a single moving mass source of monopole type. It defines a semi-infinite body whose shape slightly changes when entering the tunnel. The results of this simple model Dillmann, A.along with the comparison with analytical solutions and experimental data are shown and discussed.
A Simplified Model of the Wave Generation Due to Train-Tunnel Entry
Lect.Notes in Applied (formerly:Lect.Notes Appl.Mechan.)
International Conference on Engineering Conferences International ; 2010 ; Potsdam, Germany September 12, 2010 - September 17, 2010
2015-08-20
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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