• Title, Summary, Keyword: 구조동역학

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Structural Dynamics Analyses of a 5MW Floating Offshore Wind-Turbine Using Equivalent Modeling Technique (등가모델링기법을 이용한 5MW급 부유식 해상용 풍력발전기 구조동역학해석)

  • Kim, Myung-Hwan;Kim, Dong-Hyun;Kim, Dong-Hwan;Kim, Bong-Yung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.614-622
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    • 2011
  • In this study, the computational structural dynamic modeling of floating offshore wind turbine system is presented using efficient equivalent modeling technique. Structural dynamic behaviors of the offshore floating platform with 5MW wind turbine system have been analyzed using computational multi-body dynamics based on the finite element method. The considered platform configuration of the present offshore wind turbine model is the typical spar-buoy type. Equivalent stiffness and damping properties of the floating platform were extracted from the results of the baseline model. Dynamic responses for the floating wind turbine models are presented and compared to investigate its structural dynamic characteristics. It is important shown that the results of the present equivalent modeling technique show good and reasonable agreements with those by the fully coupled analysis considering complex floating body dynamics.

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A Study on the Elastoplastic Behavior and Yield Surface of Polymer Nanocomposites by Molecular Dynamics Simulations (분자동역학 전산모사를 이용한 나노입자 복합재의 탄소성 거동과 항복 예측에 관한 연구)

  • Yang, Seung-Hwa;Yu, Su-Young;Cho, Maeng-Hyo
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.558-561
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    • 2010
  • 본 연구에서는 나노복합재의 탄소성 거동과 항복응력을 예측하기 위해 분자동역학 전산모사를 수행하였다. 나일론 기지와 실리카 나노입자가 포함된 단위 셀 구조로부터 나노입자의 체적분율 변화에 따른 응력-변형률 선도를 등변형률을 적용한 등온등압 앙상블 전산모사로부터 도출하였다. 4%의 변형률 범위에서 나노복합재의 탄성계수를 도출하였고, 이를 이용하여 2% 오프셋 방법으로 항복응력을 예측하였다. 나노입자의 유무에 따른 항복평면의 변화와 고분자 재료에서 나타나는 정수압 효과가 항복평면에 미치는 영향을 확인하기 위해 일축 인장/압축 그리고 이축 인장/압축을 수행하였고, 각각의 경우에 나타나는 나노복합재 내부의 자유체적 변화에 대한 분석을 통해 나노입자의 강화효과를 고찰하였다. 또한 고분자 기지로 인해 발생하는 정수압 효과를 반영한 von-Miss 항복평면을 도출하고, 입자의 체적분율 변화에 따른 항복응력의 예측이 가능하도록 정수압효과에 대한 파라메터를 체적분율의 함수로 근사하였다.

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Introduction to Neutron Scattering for Magnetic Materials Research (자성소재 연구를 위한 중성자산란 입문)

  • Jeong, Jae-Hong;Lee, Sang-Hyun;Park, Je-Geun
    • Journal of the Korean Magnetics Society
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    • v.22 no.3
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    • pp.103-108
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    • 2012
  • Having a de Broglie wavelength of a few ${\AA}$ with its corresponding energies in the range of a few to a few hundreds meV, neutrons are ideally suited for the studies of structure and dynamics in condensed matter research. Neutron scattering has been developed over the past 60 years or so and become a very mature and established experimental technique in the very broad range of material sciences. In this short introductory article, we have explained its working principles and provided few selected examples of application.

OLED Dye를 찾기 위한 Ru(bpy)32+의 효율적인 에너지 계산

  • Jo, Yeong-Beom;Son, Mun-Gi;Sin, Seok-Min
    • Proceeding of EDISON Challenge
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    • pp.251-262
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    • 2014
  • 최근 유기 발광 다이오드(Organic Light Emitting Diodes; OLED)가 각광받고 있어 이를 개발하기 위한 좀 더 효율적이고 실용적인 OLED 구조의 예측이 필요해지고 있다. 본 연구는 가장 기초적인 OLED dye의 형태인 $Ru(bpy){_3}^{2+}$와 그와 유사한 구조의 발광 물질이 전기화학발광(ECL) 현상을 통해 방출하는 빛의 특성을 계산하는 것을 목적으로 한다. EDISON 화학 서버의 GAMESS 프로그램을 사용하여 $Ru(bpy){_3}^{2+}$와 유도체들의 바닥상태(ground state)와 첫 번째 들뜬 상태(first excited state)를 계산하였다. Basis set으로는 MINI와 3-21G 혹은 SBKJC를 사용하였다. 들뜬 상태 계산은 configuration interaction with single excitation(CIS)을 이용하여 단일항(singlet)과 삼중항(triplet) 상태에서 바닥과 들뜬 상태의 최적 구조에 대한 계산을 수행하였다. 다양한 방법으로 방출 파장을 계산한 결과를 바탕으로 $Ru(bpy){_3}^{2+}$와 다양한 유도체들의 에너지 계산에 어떤 방법이 효율적으로 적용될 수 있을지 탐색하였다. 같은 계산방법들이 중심 금속이 이리듐(Ir)인 분자에도 적용이 될 수 있을지 알아보기 위해 $lr(mppy)_3$에도 적용하였다. 본 연구를 통하여 얻어진 방식은 시간을 절약하고 더 효율적인 $Ru(bpy){_3}^{2+}$ 유도체 계산에도 사용할 수 있을 것이다.

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Characteristic of Thermal Conductivity of Nanocomposites under mechanical loading (인장하중이 부여된 나노복합재의 열전도 특성)

  • Yu, Su-Young;Yang, Seung-Hwa;Choi, Joon-Myung;Cho, Maeng-Hyo
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.112-115
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    • 2011
  • 본 연구는 분자동역학 전산모사를 통하여 나일론 6 고분자재료 및 나이론 6 고분자재료를 기지재료로 사용하는 나노복합재에 대하여 인장하중을 부여하고, 인장에 의하여 발생하는 구조적 변화 및 물질의 구조적 특성과 열전도 특성 사이의 상관관계를 규명하였다. 나노복합재의 열전도특성을 변화시키는 주요 인자로는 나노입자, 인장에 의한 고분자 사슬의 배열 변화, 자유부피(free volume)의 변화이다. 고분자 사슬이 열전달 방향으로 배열될 경우 음양자(phonon)의 흐름을 가속화하여 열전도특성이 증가하며, 반면 자유부피의 증가는 음양자의 산란을 증가시켜 열전도특성이 저하된다. 따라서 서로 상반작용을 하는 두 인자가 복합적으로 작용하여 열전도 특성을 결정한다. 인장 하중이 부여됨에 따라 시스템의 열전도특성이 증가하며, 각 시스템의 증가 정도는 시스템의 구조적 특성에 따라 서로 다르다.

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Study on a 2-Dimensional Dynamic Modeling Technique to Analyze the Overriding Phenomena of Rollingstock (열차의 타고오름 해석을 위한 2차원 충돌동역학 모델링 기법 연구)

  • Kim, Geo-Young;Koo, Jeong-Seo;Kwon, Tae-Soo
    • Journal of the Korean Society for Railway
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    • v.14 no.1
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    • pp.11-18
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    • 2011
  • This paper proposed a new 2-D multi-body dynamic modeling technique to analyze overriding behaviors taking place during train collision. This dynamic model is composed of nonlinear springs, dampers and masses by considering the deformable characteristics of carbodies as well as energy absorbing structures and components. By solving this dynamic model for rollingstock, energy absorbing capacities of collision elements, accelerations of passenger sections, impact forces applied to interconnecting devices, and overriding displacements can be well estimated. For a case study, we chose KHST (Korean High Speed Train), obtained crush characteristic data of each carbody section from 3-D finite element analysis, and established a 2-D multi-body dynamic model. This 2-D dynamic model was simulated under the train-to-train collision scenarios, and evaluated with 3-D virtual testing model. It was founded from the simulation results that this 2-D dynamic model could well predict overriding behaviors, and the modeling technique of carbody deformation was very important in overriding estimation.

Study on Rate Dependent Fracture Behavior of Structures; Application to Brittle Materials Using Molecular Dynamics (구조물의 속도 의존적 파괴 특성에 대한 연구; 입자동역학을 이용한 취성재료에의 적용)

  • Kim, Kunhwi;Lim, Jihoon;Llim, Yun Mook
    • Journal of The Korean Society of Civil Engineers
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    • v.28 no.4A
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    • pp.529-536
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    • 2008
  • The failure behavior of structures is changed under different loading rates, which might arise from the rate dependency of materials. This phenomenon has been focused in the engineering fields. However, the failure mechanism is not fully understood yet, so that it is hard to be implemented in numerical simulations. In this study, the numerical experiments to a brittle material are simulated by the Molecular Dynamics (MD) for understanding the rate dependent failure behavior. The material specimen with a notch is modeled for the compact tension test simulation. Lennard-Jones potential is used to describe the properties of a brittle material. Several dynamic failure features under 6 different loading rates are achieved from the numerical experiments, where remarkable characteristics such as crack roughness, crack recession/arrest, and crack branching are observed during the crack propagation. These observations are interpreted by the energy inflow-consumption rates. This study will provides insight about the dynamic failure mechanism under different loading rates. In addition, the applicability of the MD to the macroscopic mechanics is estimated by simulating the previous experimental research.

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Study on a Method of Considering the Fluid Induced External Force in Structural Dynamic Analysis (구조동역학 해석 시 유체유동에 의한 외력을 고려하는 방법에 관한 연구)

  • Seo, Seok;Yoo, Hong-Hee
    • Proceedings of the KSME Conference
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    • pp.661-665
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    • 2000
  • A method of considering the fluid induced external force in structural dynamic analysis is presented in this study. The fluid induced pressure distribution around a structure in discrete number of orientation. and velocity is calculated by using a CFD code and tabulated as resultant forces and moments in a database. These forces and moments are interpolated and employed as external forces during the dynamic analysis of structure. The reliability and usefulness of the present method is validated by using a simple discrete system example through transient analysis. The flutter speed is obtained and compared to the analytical solution. Comparing to the method in which structural dynamic and fluid flow analyses are performed simultaneously, the present method is very efficient to save computational effort.

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Error Estimation and Adaptive Time Stepping Procedure for Structural Dynamics (구조동역학에서의 오차 추정과 시간간격 제어 알고리즘)

  • 장인식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.4 no.4
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    • pp.190-200
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    • 1996
  • Step-by-step time integration methods are widely used for solving structural dynamics problem. One difficult yet critical choice an analyst must make is to decide an appropriate time step size. The choice of time step size has a significant effect on solution accuracy and computational expense. The objective of this research is to derive error estimate for newly developed time integration method and develop automatic time step size control algorithm for structural dynamics. A formula for computing error tolerance is derived based on desired period resolution. An automatic time step size control strategy is proposed based on a normalized local error estimate for the generalized-α method. Numerical examples demonstrate the developed strategy satisfies general design criteria for time step size control algorithm for dynamic problem.

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