WANG Cai-feng(王彩锋), GAO Shi-qiao(高世桥), JIN Lei(金 磊)
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 1 00081, China
Abstract： Using environmental random vibration as the excitation, traditional a ccelerometer method, non-contact video method and non-contact laser method were employed to determine the natural frequency of Kunyu River footbridge. All the r esults of these three methods are close to 2.70 Hz, which are concordant with ea ch other and hence credible.
Key words：test method; non-contact; natural frequency; amplitude-frequency curv e
CLD number： TU997 Document code： A
Article ID： 1674-8042(2013)03-0218-05 doi： 10.3969/j.issn.1674-8042.2013.03.0 04
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