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고성능 낙석ㆍ토석 대책시설용 에너지 감쇄장치 개발 연구
서상훈(Seo, Sanghoon),최민형(Choi, MinHyong) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.6
본 연구에서는 100% 해외 기술이 적용되고 있는 고성능 낙석방지울타리 및 토석류 대책시설용 링형네트 시스템의 국산화를위하여 링형네트 시스템의 주요 구성요소인 에너지 감쇄장치 개발연구를 수행하였다. 개발된 에너지 감쇄장치는 파이프가2개의 강봉을 통과하며 발생하는 저항력과 마찰력, 파이프 변형을 활용하여 전달되는 인장력을 감쇄시키는 구조로 개발되었다. 개발된 에너지 감쇄장치는 시뮬레이션 분석과 실물인장시험을 통해 그 성능을 검증하였으며, 가장 효과적인 D60.5-3.2t 파이프와롤링 간격 40 mm로 구성된 감쇄장치는 52.8~60.2 kJ/m의 감쇄성능을 갖는 것으로 확인되었다. In this study on the development of energy-dissipating devices, a significant component of the ring-net system was investigated for the localization of a high-performance rockfall fence and debris flow barriers. The energy-dissipating device was developed as a structure that dissipated the resistance and frictional forces generated by the pipe passing through two steel bars, and the tensile force was transmitted by utilizing the pipe deformation. The performance of the developed energy-dissipating device was verified through simulation analysis and tensile tests. It was confirmed that the most effective dissipating device was made of a D60.5-3.2t pipe subjected to a rolling interval of 40 mm, and the device exhibited an energy-dissipating performance of 52.8-60.2 kJ/m.
주파수응답함수를 이용한 유한요소모델의 개선 및 결합부 동정
서상훈,지태한,박영필 한국소음진동공학회 1997 소음 진동 Vol.7 No.1
Despite of the development in the finite element method, it is difficult to get the finite element model describing the dynamic characteristics of the complex structure exactly. Therefore a number of different methods have been developed in order to update the finite element model of a structure using vibration test data. This paper outlines the basic formulation for the frequency response function based updating method. One important advantage of this method is that the intermediate step of performing an eigensolution extraction is unnecessary. Using simulated experimental data, studies are conducted in the case of 10 DOF discrete system. The solution of noisy and incomplete experimental data is discussed. True measured frequency response function data are used for updating the finite element model of a beam and a plate. Its applicability to the joint identification is also considered.