Dynamic Behaviour of Railway Vehicle under Bump and Pothole Track Irregularities
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Abstract
The railway vehicle moving on a track is subjected to several types of track irregularities. The random track irregularities are statistical and usually modelled as stationary and ergodic functions. The periodic track irregularities mainly are sinusoid, damped sinusoid, cusp, bump, jog, plateau, trough and pothole. These deterministic inputs i.e. sinusoid, damped sinusoid, cusp, bump is usually modelled through exponential or sine functions, whereas jog, plateau, trough are represented through an elliptical or parabolic mathematical function. In the present work, 27 degrees of freedom railway vehicle is modelled using Lagrangian method. Its vibrational response and ride behaviour are analysed under bump and pothole inputs. The ride evaluation is carried out using Sperling Ride Index.
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