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Rail is a main part of railway track. Its reliability relates to the national economy and people's livelihood. The fracture of rail will lead to disastrous consequences. This article mainly introduces the residual stress of rail detection and regulation technology, completes the relevant tensile experiments and rail experiments, analyses the results and the function of regulation. Eventually, an effective...
The paper describes the design of a rail defect detection system, which is suitable for 43 kg/m to 75 kg/m rails' in service inspection requirements. The defect acquisition module of the system is composed of some conventional probes and phased array probes. In defect signal processing module, FPGA was used to deal with the multi-channel defect data by using its parallel processing function. The system...
Based on the television inspection requirement of steam generator secondary side center lane, the center lane automatic TV inspection technology was studied and inspection device was developed. In this paper, the mechanism, components and results of inspection device were described. By far, such a device has already been successfully applied to NPP domestic.
Rail is one of the vital components of the railway system. Rail flaw detection plays an important role in ensuring the safety of railway transportation. Nowadays, rail inspection system based on conventional ultrasonic technology can't meet the practical application needs well due to the problems of low-detection coverage rate and inconvenient to change ultrasonic angle. To solve those problems, a...
Eddy current pulsed thermography (ECPT) is an emerging non-destructive testing and evaluation (NDT&E) technique for conductive material. However, surface emissivity variation of metallic object influences accurate temperature mapping in infrared thermography, which leads to false alarm of defect detection. This paper proposes a new emissivity correction method for ECPT based on spectral reflectance...
Electromagnetic acoustic transducer (EMAT) is used for rail base flaw detection. The bidirectional radiation pattern of Shear Vertical wave (SV-wave) EMAT limits the accuracy and efficiency of the transducers. In view of this problem, a method of generating unidirectional focusing SV wave is brought up by a unidirectional line-focusing SV-wave EMAT. A 2D finite element model is built to demonstrate...
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