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장애물 회피에 페널티 보행 속도 알고리즘을 적용한 여객선 승객 탈출 시뮬레이션
박광필,하솔,조윤옥,이규열,Park, Kwang-Phil,Ha, Sol,Cho, Yoon-Ok,Lee, Kyu-Yeul 한국시뮬레이션학회 2010 한국시뮬레이션학회 논문지 Vol.19 No.4
In this paper, advanced evacuation analysis simulation on a passenger ship is performed. Velocity based model has been implemented and used to calculate the movement of the individual passengers under the evacuation situation. The age and gender of each passenger are considered as the factors of walking speed. Flocking algorithm is applied for the passenger's group behavior. Penalty walking velocity is introduced to avoid collision between the passengers and obstacles, and to prevent the position overlap among passengers. Application of flocking algorithm and penalty walking velocity to evacuation simulation is verified through implementation of the 11 test problems in IMO (International Maritime Organization) MSC (Maritime Safety Committee) Circulation 1238.
탄성 다물체 동역학을 기반으로 한 부유식 풍력 발전기 타워의 구조 해석
박광필(Kwang Phil Park),차주환(Ju Hwan Cha),구남국,조아라,이규열(Kyu Yeul Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, we perform structural analysis of a wind turbine tower considering the dynamic response of the wind turbine platform. A multibody system which consists of three blades, a hub, a nacelle, the platform and the tower, is used to model the floating wind turbine. The blades and the tower are modeled as flexible bodies using three dimensional beam elements. Aerodynamic force on the blades is calculated by BEM (Blade Element Momentum) theory with the hub rotation. The hydrostatic, hydrodynamic and mooring forces are considered for the platform. The structural dynamic responses of the tower are simulated by solving the equations of motion numerically. From the simulation results, the time history of the internal forces at the nodes such as bending moment and stress are obtained. In the conclusion, the internal forces are compared with those from static analysis for the purpose of assessing wave loads on the structural stability of the tower.
해상 크레인 탄성 붐 적용을 위한 3D 빔(beam) 유한 요소 정식화 및 자동화
박광필(Kwang-Phil Park),차주환(Ju-Hwan Cha),이규열(Kyu-Yeul Lee),함승호 (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1
In this paper, in order to analyse the dynamic response of a floating crane and a cargo, the boom of the floating crane is considered as a 3 dimensional elastic beam. The boom is divided into more than 2 elements based on finite element formulation and the deformation of each element is expressed in term of shape matrix and nodal coordinates. The equation of motion for the elastic boom is consists of mass matrix, stiffness matrix and quadratic velocity vector which contains the gyroscopic and Coriolis force. Since as the number of element increase, the size and complicity of those matrices are also increase, it is not practically possible to derive the equation of motion for each number of element. To overcome the difficulty, each matrix for one element is expressed by some elementary matrices which are given for 3 dimensional beam. Especially the quadratic velocity vector is derived as a multiplication of shape matrix and 3 dimensional rotation matrix. By using the derived matrices, the equation of motion for multi element boom is automatically constructed. A simulation system is implemented for the dynamic analysis of the floating crane and the cargo. The simulation results with the elastic boon of various number of elements are presented.
탄성 다물체계 동역학을 기반으로 한 부유식 해상 풍력 발전기 타워의 구조 해석
박광필(Kwang-Phil Park),차주환(Ju-Hwan Cha),구남국(Namkug Ku),조아라(A-Ra Jo),이규열(Kyu-Yeul Lee) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.12
본 논문에서는 부유식 플랫폼의 동적 거동을 고려하여 해상 풍력 발전기 타워의 구조 해석을 수행하였다. 풍력 발전기는 플랫폼, 타워, 낫셀, 허브 그리고 3 개의 블레이드로 구성된다. 타워는 3 차원 빔 요소를 사용하여 탄성체로 모델링하여 탄성 다물체계 동역학을 기반으로 한 운동 방정식을 구성하였다. 회전하는 블레이드에는 블레이드 요소 운동량 이론에 따라 계산된 공기역학적 힘이 적용되었고, 부유식 플랫폼에는 유체정역학적 힘, 유체동역학적 힘 그리고 계류력이 적용되었다. 타워의 구조 동역학적 거동을 수치적으로 시뮬레이션하였다. 시뮬레이션 결과를 이용하여 굽힘 모멘트와 응력을 산출하고 허용치와 비교하였다. In this study, we perform the structural analysis of a floating offshore wind turbine tower by considering the dynamic response of the floating platform. A multibody system consisting of three blades, a hub, a nacelle, the platform, and the tower is used to model the floating wind turbine. The blades and the tower are modeled as flexible bodies using three-dimensional beam elements. The aerodynamic force on the blades is calculated by the Blade Element Momentum (BEM) theory with hub rotation. The hydrostatic, hydrodynamic, and mooring forces are considered for the platform. The structural dynamic responses of the tower are simulated by numerically solving the equations of motion. From the simulation results, the time history of the internal forces at the nodes, such as the bending moment and stress, are obtained. In conclusion, the internal forces are compared with those obtained from static analysis to assess the effects of wave loads on the structural stability of the tower.