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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.
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.
평면상 승객의 회전 자세를 고려한 가속도 기반의 승객 탈출 분석 시뮬레이션
박광필(Kwang-Phil Park),조윤옥(Yoon-Ok Cho),하솔(Sol Ha),이규열(Kyu-Yeul Lee) (사)한국CDE학회 2010 한국CDE학회 논문집 Vol.15 No.4
In this paper, an acceleration based passenger evacuation simulation is performed. In order to describe a passenger’s behavior in an evacuation situation, a passenger is modeled as a rigid body which translates in the horizontal plane and rotates along the vertical axis. The position and rotation angle of a passenger are calculated by solving the dynamic equations of motions at each time step. The destination force, the contact force, and the group force are considered as external forces and the moments due to each force are also considered. With the passenger model proposed in this paper, the test problems in International Maritime Organization, Maritime Safety Committee/Circulation 1238(IMO MSC/Circ.1238) are implemented and the effects of passenger rotation on the evacuation time are confirmed.
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.