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Time-varying characteristics of bridges under the passage of vehicles using synchroextracting transform

机译：同步通过变换在车辆通过时桥梁的时变特性

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摘要

The vehicle and bridge responses in a vehicle-bridge interaction (VBI) system have been widely studied with some aiming at the bridge health monitoring. The extraction of bridge modal frequencies from bridge or vehicle responses was mostly conducted with the assumption of an invariant vehicle and bridge system and/or the responses are stationary during the interaction. This assumption may be appropriate when the vehicle mass is negligible compared with the bridge mass. The vehicle and bridge frequencies are time-varying in practice during the VBI process and these time-varying characteristics are potential indicators for bridge condition assessment. This paper presents a new method to extract the time-varying characteristics of the bridge under the passage of vehicles. A time-frequency (TF) analysis method, the synchroextracting transform, is adopted for the purpose. It is a post-processing procedure with short-time Fourier transform to improve the TF resolution on the time-varying features of the signal. The instantaneous frequency of mono-components related to the vehicle and bridge frequencies can then be extracted from the time-frequency representation of the responses. Numerical investigation is conducted to study the effect of measurement noise, vehicle properties and road surface roughness on the identified results. Laboratory and field tests are also conducted to validate the proposed approach. Results show that the time-varying characteristics are good indicators for bridge condition assessment.
机译：车桥相互作用（VBI）系统中的车桥响应已被广泛研究，其中一些旨在监测桥的健康状况。从桥梁或车辆响应中提取桥梁模态频率主要是在假设车辆和桥梁系统不变的情况下进行的，并且/或者响应在交互过程中是固定的。当车辆质量与桥梁质量相比可忽略不计时，此假设可能是合适的。实际上，车辆和桥梁的频率在VBI过程中是时变的，这些时变特性是评估桥梁状况的潜在指标。本文提出了一种在车辆通过时提取桥梁时变特征的新方法。为此，采用了时频（TF）分析方法，即同步提取变换。它是一种具有短时傅立叶变换的后处理程序，可提高信号随时间变化的特征的TF分辨率。然后可以从响应的时频表示中提取与车辆和桥频率相关的单组分的瞬时频率。进行了数值研究，以研究测量噪声，车辆性能和路面粗糙度对识别结果的影响。还进行了实验室和现场测试以验证所提出的方法。结果表明，时变特性是桥梁状态评估的良好指标。

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