Abstract
A practical structural health monitoring (SHM) system based on Lamb wave for high-speed train car-body structures is presented. The system can detect the occurrence and report the location and probabilistic size of structural damage in real-time. Based on the theory of Lamb wave, a piezoelectric transducer array network is implemented to generate and acquire the detection signal by mounting on the surface of the structure to be monitored. An algorithm, that can locate, quantify and image the damage based on the damage index that indicates the differential between baseline signal and current acquired signal, is proposed to develop the system. Furthermore, a system framework of three-layer architecture and a diagnosis strategy are designed to build the SHM system. Finally, the system is implemented on China's latest high-speed train (CRH380A) operated along the Chengdu-Chongqing High-Speed Railway after well tuning then demonstrates the feasibility and reliable in practical application.
Highlights
As the rapid development of the high-speed railway industry in China, the operation speed of trains and the construction of high-speed railways keep growth
EXPERIMENTS AND RESULTS The proposed structural health monitoring (SHM) technique is verified by installing on a CRH380A high-speed train operated along ChengduChongqing High-Speed Railway (CCHSR) from June to elevated sections, and 2 tunnels, and started operation on 26 December 2015
In this paper, a practical SHM system based on Lamb wave for high-speed train car-body is developed and implemented on China’s lasted high-speed train (CRH380A)
Summary
As the rapid development of the high-speed railway industry in China, the operation speed of trains and the construction of high-speed railways keep growth. Structural safety and reliability of high-speed trains have been concerned intensively. For the car-body of high-speed train unit, which is welded by aluminum-alloy extra-long extruded profiles or plate for lightweight purpose, suffers a wide range of hazards such as weight of passengers and equipment, loading of structures and eroding from the environment, all of which may lead to structural degradation phenomenon (e.g., stress corrosion). Plan-based maintenance has been carried out and plays an important role in preventing structural failure. In the plan-based maintenance system, inspection on integrity and reliability of key structures such as underframe, side-wall, and end-wall relies on nondestructive testing (NDT) techniques, which includes magnetic inspection, radiographic inspection and so on. NDT usually has limitations such as time-consuming, labor-intensive, costconsuming, and most importantly, off-line [1], [2]
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