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도시철도차량 알루미늄 차체의 동적하중 시험에 의한 피로 강도 평가
서승일(Sung ll Seo),박춘수(Choon Soo Park),신병천(Byung Cheon Shin) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Aluminum carbody for rolling stocks is light and perfectly recyled, but includes severe defects which are very dangerous to fatigue strength. Structural integrity assessment for the carbody by static losd test has been performed up to date. In this study, to evaluate fatigue strengthh the aluminum carbody of unban transit unit, a testing mathod simulate loading condition was proposed and the fatigue sttength of the carbody was evaluated. The dynamic load test results showed that the alternating stress ranges were diffenrent from the estimstrd rangrs based the static test results, Excessive stress ranges at the center are thought come from the flexible motion of the carbody. published fatigue test date for aluminum componrnts, but variation of alternating acceleration along the lenhth due to flexibility of carbody yielded unexpected results. Because fating stebgth based on the static test resu;ts may be overestimated the center, modification of testing method necessary.
서승일(Sung Il Seo),박춘수(Choon Soo Park),신병천(Byung Cheon Shin) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Aluminum carbody for rolling stocks is light and perfectly recycled, but includes severe defects which are very dangerous to fatigue strength. Static load test has been performed up to date to assess structural safety of the carbody. However, static load test is not sufficient to evaluate fatigue strength of the carbody, because fatigue failure is caused by dynamic load. In this study, the established load test methods for carbody are described and the characteristics of the methods are discussed. Also, a testing method to simulate dynamic loading condition is proposed for evaluation of fatigue strength of the carbody. The results by the proposed testing method are compared with the results by the static load test and new findings are discussed.
서승일(Sung-Il Seo),박춘수(Choon-Soo Park),신병천(Byung-Cheon Shin) 한국철도학회 2004 철도저널 Vol.7 No.1
Aluminum carbody for rolling stocks is light and perfectly recycled, but includes severe defects which are very dangerous to fatigue strength, Static load test been performed up to date to assess structural safety of the carbody. However, static load test is not sufficient to evaluate fatigue strength of the carbody, because fatigue failure is caused by dynamic load. In this study, the established load test methods for carbody are described and the characteristics of the methods are discussed. Also, a testing method to simulate dynamic loading condition is proposed for evaluation of fatigue strength of the carbody. The results by the proposed testing method are compared with the results by the static load test and new findings are discussed.
성호경(Sung Ho Kyung),조정민(Jho Jeong Min),이종무(Lee Jong Moo),남용윤(Nam Yong Youn),신병천(Shin Byung Cheon) 한국철도학회 2006 한국철도학회 세미나자료 Vol.- No.-
The EMS system requires a very delicate suspension control to maintain constant air-gap between the magnet and the guide-way rail. To maintain a constant air-gap with attraction force, the EMS system dynamics is changed according to uncertainties and disturbances, and it also requires reliability against component failures. Since uncertainties and component failures are frequently caused in EMS system, it is very important to develop the robust and reliable control system. In this paper, we consider the design problem for robust and reliable controller in the presence of uncertainties and component failures.