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原文传递 Application of Lahut Technology for Wayside Cracked Wheel Detection. High Speed Rail IDEA Program.

题名：	Application of Lahut Technology for Wayside Cracked Wheel Detection. High Speed Rail IDEA Program.
作者：	morgan, r. morgan, j. brosseau, j. gonzales, k. garcia, g.
关键词：	safety, laser ultrasound, railroad industry, defects, fatigue cracks, shattered rim cracks, transducers, prototypes, durability, stability, identification systems, nondestructive testing, data transmission
摘要：	Current nondestructive inspection techniques available to the railroad industry today require the removal and testing of wheel sets in maintenance shops to accurately detect wheel defects. These techniques also require contact or near contact conditions between the tested wheel and inspection probe. The development and testing of a prototype system to inspect wheels under a moving train began with defining a set of requirements and specifications needed to meet the overall objective for this project. This objective was to develop a wayside detection system capable of remotely inspecting railcar wheels for shattered rim cracks. Other tasks performed included laboratory experimental work to find optimal positions for laser generation and detector transducers; system design; prototype development and assembly; and field testing and evaluation of the prototype. The initial results indicated that this application of laser-based ultrasound has the potential to perform wayside inspections of moving wheels. However, the field testing revealed several problems that would have to be solved if the system is to be successfully implemented. The field test prototype was unable to reliably identify wheels with known defects due to such factors as a lack of stability and durability of the wheel tracking and laser beam delivery system. Other improvements that will be either necessary or desirable include determination of flaw size rather that merely whether flaws exceeds a threshold limit, increasing the maximum inspection speed, ensuring an acceptable false alarm rate, increasing the types of flaws that can be detected beyond shatter rim cracks, developing a wheel tracking and identification system, and identifying a method of remote data transmission from trackside to a receiving station. / NOTE: Final Rept. (March 2004-May 2005). / Supplementary Notes: Sponsored by Transportation Research Board, Washington, DC. IDEA Programs. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0724；35p
报告类型：	科技报告