This paper dealt with the interior noise phenomena inside tunnels with slab track system at train speeds of 260 km/h ~ 300 km/h. Interior noise of passenger coaches results from rolling dynamics of wheel and rail and vehicle constructions which are dependent on track systems and train speeds. At high speeds where the aerodynamic effects become dominant it can influence the structure borne noise sources of vehicles and results in amplification of noise components in certain frequency areas. Various noise sources exist simultaneously at the high speed operation. In this study the increased noise and vibration level inside tunnels with slab track system compared to the level inside tunnels with ballasted track system are investigated, which occurred mainlyat low frequencies and could be heard as Booming noise interior of the passenger coach especially. Measured sound levels in other high speed sections, such as open fields show also relatively high energy portion at that frequency area but are not so pronounced as in tunnels. As one aspect aerodynamic effects near the inter space cavities between passenger coaches where the articulated bogie systems are placed are investigated. Maybe it is not directly related to the tunnels with slab track system itself but considering the noise increased in frequency areas 70 Hz to 100 Hz, acoustical feedback effects due to the flow disturbance along the cavity gaps are studied. The effects of resonance frequency change due to the gap si/e variation on the interior noise level of passenger coaches in two types of tunnels are compared. In the related frequency band the interior noise level could be reduced and the differences between noise levels inside two types of tunnels could be reduced as well. However it is still remained to identify other parameters which cause the noise increase inside the tunnels with slab track system and to reduce it efficiently.
A study on source mechanism in the interior noise problem of high speed trains
2008
7 Seiten, 8 Bilder, 6 Quellen
Conference paper
English
A Study on Source Mechanism in the Interior Noise Problem of High Speed Trains
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