6533b86cfe1ef96bd12c80ee

RESEARCH PRODUCT

Identification of Bending Modes of Vibration in Rails by a Laser Doppler Vibrometer on a Moving Platform

Arvin EbrahimkhanlouAntonina PirrottaKorkut KaynardagSalvatore SalamoneGiuseppe Battaglia

subject

PhysicsSleeper passing frequencyRailMechanical EngineeringAcoustics02 engineering and technologyBendingTransportation technologySpan (engineering)Accelerometer01 natural sciencesSignal010309 opticsVibration020303 mechanical engineering & transports0203 mechanical engineeringMechanics of MaterialsNormal modeMoving laser Doppler vibrometer0103 physical sciencesVibration modesSystem identificationSettore ICAR/08 - Scienza Delle CostruzioniLaser Doppler vibrometer

description

This paper introduces a method to identify the bending modes of vibration of railway tracks by using a laser Doppler vibrometer (LDV) mounted on a moving platform. Two sets of experiments were conducted at Transportation Technology Center Inc. (TTCI) in Pueblo Colorado, in order to validate the proposed method. First, the bending vibration modes were identified using the signals collected from a rail span (rail section between two consecutive sleepers) by accelerometers under moving car excitation. Then, vibration measurements from rail spans were obtained by using an LDV mounted on the moving railcar. All tests were carried out at four different rail car speeds: 8 km/h (5 mph), 16 km/h (10 mph), 35 km/h (22 mph), and 45 km/h (28 mph). To find LDV signal segments corresponding to rail spans, a novel approach based on the sleeper passing frequency is introduced. Comparison of the results from both sets of tests demonstrated good agreement for all speeds.

yearjournalcountryeditionlanguage
2020-09-11
10.1007/s40799-020-00401-9http://hdl.handle.net/10447/473447