Abstract Sound Transit has conducted many wayside train vibration measurement campaigns since 2007 to characterize vibration emissions from the trains and track. The vibration emissions are defined by force density levels (FDL) that are usually based on empirical vibration data. Because there are many competing factors that influence the FDLs, correlation of the empirical data with controlling mechanisms is not straightforward. A more robust dataset developed from multiple test campaigns under different conditions is required to develop an overall understanding of the underlying vibration mechanisms. This paper looks at results from seven major vibration test programs between 2007 and 2015 and attempts to tease out the key features of FDLs from the existing Sound Transit LRV fleet. The existing Sound Transit LRV fleet vibration spectra show three distinct frequency regimes. The low frequency peaks in the FDL spectra are predominantly influenced by the primary resonance frequency of the motored truck and the mid frequency peaks are influenced by the center truck characteristics. The track stiffness, damping characteristics and resilient wheel determine the amplitude and shape of the high frequency peaks. Factors such as speed also influence the FDLs. For a given track and vehicle type combination, the key factors that influence FDLs are wheel-rail profile match, maintenance of the wheel-rail surfaces and frictional forces in the wheel-rail interface.
A Comprehensive Review of Force Density Levels from Sound Transit’s Light Rail Transit Fleet
2018-01-01
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
A Comprehensive Review of Force Density Levels from Sound Transit's Light Rail Transit Fleet
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