Research on Extracting Bridge Frequencies from Dynamic Responses of a Passing Vehicle
Date Issued
2004
Date
2004
Author(s)
Lin, Cheng-Wei
DOI
en-US
Abstract
The frequencies of vibration of bridges represent a kind of information that is most useful for many purposes. Traditional vibration tests aimed at measuring the bridge frequencies often require on-site installation of the measurement equipment. The idea of using a moving vehicle over a bridge as a message carrier of the bridge is explored theoretically in this study. Employing a simple model from scratch for simulating the vehicle-bridge interaction response, with which approximate, but reasonably accurate, solutions for both the bridge and the vehicle are presented in closed-forms. The key parameters dominating the vehicle-bridge response are identified. The dynamic responses of the bridge are governed at different extents by two frequency sets pertaining to the driving frequency resulting from the vehicle passing and natural frequencies of the bridge. On the other hand, the vehicle responses are governed by five distinct frequencies that appear as driving frequencies, vehicle frequency, and bridge frequencies with shift.
In this study, the frequencies of vibration of a bridge also have been measured from the dynamic response of a two-wheel cart hauled by a light truck moving over the bridge. The front truck can be regarded as the exciter to the bridge, and the towed cart serves as a receiver of the bridge vibrations. By fast Fourier transform to the measured vehicle dynamic responses, the frequencies of the bridge can then be extracted successfully. The feasibility of the present approach for indirectly measuring the bridge frequencies from the vehicle response was discussed theoretically and confirmed by the field tests. The methodology developed herein is simple and efficient, which can be readily applied to a wide range of practical problems.
Subjects
萃取
頻率量測
車輛振動
橋梁振動頻率
Frequency Measurement
Extracting
Vehicle Vibration
Bridge frequencies
Type
thesis
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