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이필승(Lee Phill-Seung),노혁천(Noh Hyuk-Chun) 대한토목학회 2007 대한토목학회논문집 A Vol.27 No.3A
본 논문에서는 최근 주요 연구들을 토대로 쉘 구조물의 유한요소해석에 대하여 중요한 개념들과 그 연관관계를 고찰한다. 감절점 쉘 유한요소의 수학모델인 기본쉘수학모델을 살펴본다. 쉘 구조물의 두께가 얇아짐에 따라 일어나는 쉘 구조문제의 세가지 극한거동들(휨지배거동, 막지배거동, 혼합지배거동)에 대한 쉘의 점근거동 이론을 소개하고 점근거동을 유한요소해석을 통해 찾아내는 방법을 알아본다. 유한요소해의 오차를 s-norm으로 평가하는 방법을 소개하고 이를 이용하여 쉘 유한요소의 잠김현상이 유한요소해의 수렴곡선에 어떻게 나타나는지 살펴본다. 쉘 구조물의 유한요소해석에서 균일최적수렴의 개념을 논의한다. 마지막으로 이상적인 쉘 유한요소의 조건을 알아보고 쉘 유한요소의 성능평가를 위한 방법론을 제시한다. Based on recent research works, important concepts on the finite element analysis of shell structures and the relations among them are presented in this paper. We review the basic shell mathematical model, which is the underlying mathematical model of the continuum mechanics based shell finite elements. The asymptotic theory of shell structures then is reviewed and we present how to evaluate the asymptotic behavior in finite element solutions. S-norm is introduced as an error measure of finite element solutions and we show "locking" in the convergence curves of shell finite element solutions. We discuss the concept of "uniform optimal convergence" in finite element analysis of shells. We finally summarize requirements on ideal shell finite elements and propose how to perform benchmark tests of shell finite elements.
이주희(Joohee Lee),윤성진(Seongjin Yoon),정현(Hyun Chung),이필승(Phill-Seung Lee) (사)한국CDE학회 2010 한국CDE학회 논문집 Vol.15 No.3
The axiomatic design principles are applied to the conceptual design of semi-submersible type mobile harbor (B1). The process of how the design of mobile harbor is elaborated, evaluated and improved from the very beginning is presented in this paper. The concept of mobile harbor is a functional harbor, which can move to a container ship anchoring out of ports in the deep water to load/unload containers on sea and transfer them to their destination ports. This floating system will innovate the maritime transport and distribution since it will greatly enhance the accessibility of super-sized container ships to existing harbors and harbors without enough infrastructures. Designing a mobile system which can perform the functions of traditional harbors on the floating system requires innovative ideas as well as rigorous validations of each sub systems. In order to enhance the chance of design success, we try to satisfy the design axioms in early stage of conceptual design. We use the zigzagging process for defining Functional Requirements (FR)-Design Parameters (DP) hierarchy due to the complexity of the system. In other words, we decomposed the complexity of the design by FR-DP hierarchy and reduced coupled design logically and systematically. This paper shows applicability of the axiomatic design principles to the field of ocean systems engineering.
LS-DYNA를 이용한 원자력발전소의 로드블록에 대한 차량 충돌 시뮬레이션
이승규,김동욱,이필승,SeungGyu Lee,Dongwook Kim,Phill-Seung Lee 한국전산구조공학회 2023 전산구조공학 Vol.36 No.2
This paper introduces a simulation method for the collision between roadblocks and vehicles using LS-DYNA. The need to evaluate the performance of anti-ram barriers to prepare for vehicle impact has increased since vehicle impact threats have been included as a design criterion for nuclear power plants. Anti-ram barriers are typically certified for their performance through collision experiments. However, because Koreas has no performance testing facilities for anti-ram barriers, their performance can only be verified through simulations. LS-DYNA is a specialized program for collision simulation. Various organizations, including NCAC, distributes numerical models that have been validated for their accuracy with collision tests. In this study, we constructed a finite element model of the most critical vehicle barrier module and simulated collision between roadblocks and vehicles. The calculated results were verified by applying the validation criteria for vehicle safety facility collision simulations of NCHRP 179.
이주희(Joohee Lee),윤성진(SeongJin Yoon),정현(Hyun Chong),이필승(Phill-Seung Lee) (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1
The axiomatic design principles are applied to the conceptual design of semi-submersible type mobile harbor (B1). The process of how the design of mobile harbor is elaborated, evaluated and improved from the very beginning is presented in this paper. The concept of mobile harbor is a functional harbor, which can move to a container ship anchoring out of ports in the deep water to load/unload containers on sea and transfer them to their destination ports. This floating system will innovate the maritime transport and distribution since it will greatly enhance the accessibility of super-sized container ships to existing harbors and harbors without enough infrastructures. Designing a mobile system which can perform the functions of traditional harbors on the floating system requires innovative ideas as well as rigorous validations of each sub systems. In order to enhance the chance of design success, we try to satisfy the design axioms in early stage of conceptual design. We use the zigzagging process for defining Functional Requirements (FR)-Design Parameters (DP) hierarchy due to the complexity of the system. In other words, we decomposed the complexity of the design by FR-DP hierarchy and reduced coupled design logically and systematically. This paper shows applicability of the axiomatic design principles to the field of ocean systems engineering.
Gil Yong Lee(이길용),Phill-Seung Lee(이필승),Yong-Hwa Park(박용화) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In structural dynamics, the harmonic balance method (HBM) has been widely applied to obtain the frequency response of many mechanical systems in the presence of nonlinearities. It approximates the periodic solution utilizing a truncated Fourier series, resulting in a set of nonlinear algebraic equations in the frequency domain. However, one still difficulty in the HBM is that dimension of the nonlinear equations is the product of number of degrees of freedoms and harmonics , so the computational cost of the continuation over the frequency range can be easily burdensome . In this work , we present the proper generalized decomposition -based harmonic balance method (PGD-HBM) for the efficient numerical continuation of the nonlinear frequency response. The PGD-HBM utilizes the low-dimensional subspace of the HBM, constructing the HBM response as a separated representation of the spatial and temporal components . The updated progressive Galerkin scheme is adopted to obtain a set of components . During the continuation , the spatial modes obtained at the previous computation are used as a reduced basis. Through numerical studies, it is demonstrated that the PGD-HBM not only provides significant computational savings compared to the HBM, but also maintains accuracy.
김진영,윤주성,김용욱,이필승,Kim. Jin Young,Youn. Joo Seong,Kim. Yong Yook,Lee. Phill-Seung 한국방재학회 2013 한국방재학회 학술발표대회논문집 Vol.2013 No.1
현재 지진과 관련된 토목구조물의 내진설계 규정의 제정은 활발하게 이루어지고 있는 편이나, 연안구조물의 지진해일에 대비한 설계 규정은 아직 전무한 실정이다. 하지만 2011년 동일본 대지진을 통한 지진해일의 위험성이 크게 대두되고 있으며, 특히 우리나라 동해 연안지역은 일본 서해안에서 발생하는 지진해일에 의해 피해를 입을 수 있는 지역으로서 특히 이 지역의 연안구조물의 지진해일에 대한 대비가 필요하며 피해 발생 시의 피해 예측이 필요하다. 이를 위해 본 연구에서는 2011년 동일본 대지진에서 지진해일에 의하여 발생한 피해사례 중 토목구조물의 피해사례에 관하여 중점적인 조사와 분석을 수행하였다.