ON-BOARD RESONANT BRIDGE DETECTION METHOD USING CARBODY VERTICAL ACCELERATIONS OF A HIGH-SPEED TRAIN

Abstract

 Bridges that resonate under a passing a train disturb the passengers and degrade the sub-structures on the bridge. As serious resonance often requires counter measures, resonance phenomena must be properly detected. This study proposes a method that comprehensively and efficiently detects resonant bridges among a huge number of bridges from the carbody vertical accelerations measured at the head and tail of a train. After theoretically analyzing the vibration component peculiar to a given resonant bridge, the on-board resonant bridges detection method is proposed. The proposed method processes differences between filtered/ enveloped carbody vertical acceleration responses measured on the first and the tail vehicle. The detection accuracy of the method was verified through numerical simulations. Finally, the proposed method was applied to carbody vertical accelerations measured on a commercial train on a high-speed railway. The resonance states of the two resonant bridges identified by the proposed on-board resonant bridge detection method were verified by in-situ measurements.