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Damage identification of vehicle-track coupling system from dynamic responses of moving vehicles

机译：从行驶中的车辆的动力响应识别车辆-轨道耦合系统的损伤

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摘要

The structural responses are often used to identify the structural local damages. However, it is usually difficult to gain the responses of the track, as the sensors cannot be installed on the track directly. The vehicles running on a track excite track vibration and can also serve as response receivers because the vehicle dynamic response contains the vibration information of the track. A damage identification method using the vehicle responses and sensitivity analysis is proposed for the vehicle track coupling system in this paper. Different from most damage identification methods of vehicle-track coupling system, which require the structural responses, only the vehicle responses are required in the proposed method. The local damages are identified by a sensitivity-based model updating process. In the vehicle-track coupling system, the track is modeled as a discrete point supported Euler-Bernoulli beam, and two vehicle models are proposed to investigate the accuracy and efficiency of damage identification. The measured track irregularity is considered in the calculation of vehicle dynamic responses. The measurement noises are also considered to study their effects to the damage identification results. The identified results demonstrate that the proposed method is capable to identify the local damages of the track accurately in different noise levels with only the vehicle responses.
机译：结构响应通常用于识别结构局部损坏。但是，由于传感器不能直接安装在轨道上，因此通常很难获得轨道的响应。在轨道上行驶的车辆会激发轨道振动，并且还可以用作响应接收器，因为车辆动态响应包含轨道的振动信息。提出了一种基于车辆响应和灵敏度分析的损伤识别方法。与大多数要求结构响应的车辆-履带耦合系统的损伤识别方法不同，该方法仅要求车辆响应。通过基于灵敏度的模型更新过程来识别局部损坏。在车辆-轨道耦合系统中，将轨道建模为离散点支撑的Euler-Bernoulli梁，并提出了两种车辆模型来研究损伤识别的准确性和效率。在计算车辆动态响应时会考虑到测得的轨道不规则性。还考虑使用测量噪声来研究其对损伤识别结果的影响。识别的结果表明，所提出的方法能够仅在车辆响应的情况下，在不同的噪声水平下准确地识别出轨道的局部损坏。

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