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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(Seung-Ho Ham) (사)한국CDE학회 2010 한국CDE학회 논문집 Vol.15 No.6
In this paper, the boom of a floating crane is modeled as a 3-dimensional elastic beam in order to analyze the dynamic response of the crane and its cargo. The boom is divided into more than two elements based on finite element formulation, and deformation of each element is expressed in terms of shape matrix and nodal coordinates. The equations of motion for the elastic boom consist of a mass matrix, a stiffness matrix, and a quadratic velocity vector that contains the gyroscopic and Coriolis forces. The size and complicity of the matrices increase in proportion with the number of elements. Therefore, it is not possible to derive the equations of motion explicitly for different number of elements. To overcome this difficulty, matrices for one 3-dimensional element are expressed with elementary sub-matrices. In particular, the quadratic velocity vector is derived as a product of a shape matrix and a 3-dimensional rotation matrix. By using the derived matrices, the equations of motion for the multi-element boom are automatically constructed. To verify the implementation of the elastic boom based on finite element formulation, we simulated a simple vibration of the elastic boom and compared the average deformation with the analytic solution. Finally, heave motion of the floating crane and surge motion of the cargo are presented as application examples of the elastic boom.
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.
탄성 붐을 유한 요소 모델로 고려한 해상 크레인의 3차원 동적 거동 해석
박광필(Kwang Phil Park),차주환(Ju Hwan Cha),이규열(Kyu Yeul Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.6
본 논문에서는 탄성 붐을 유한 요소 모델로 고려하여 해상 크레인과 중량물의 3 차원 동적거동을 해석하였다. 탄성 붐의 각 요소(element)는 절점 좌표와 보간 함수를 이용하여 공간상의 3 차원 변위를 갖는 빔(beam)으로 모델링 하였다. 다물체 동역학 (mltibody system dynamics)을 기반으로 탄성 붐이 고려된 6 자유도 해상크레인과 6 자유도 중량물의 운동방정식을 구성하였다. 외력으로는 해양파에 의한 선박유체정역학 힘과 선박유체동역학 힘 그리고 와이어 로프(wire rope) 장력, 계류력(mooring force)을 고려하였다. 외력으로 고려하는 해양파의 방향을 변경하며 해상크레인과 중량물의 3차원 동적 거동을 수치적으로 시뮬레이션 하였다. In this paper, finite element model of elastic booms is derived for the dynamic response analysis of a floating crane with a cargo. In order to consider the 3 dimensional motions of the floating crane in waves, the 3 dimensional beam elements are used for the elastic booms. Displacements are expressed in terms of the shape matrix and nodal coordinates. Mass matrix and stiffness matrix of the elastic booms are coupled with the dynamic equations of motions of the floating crane and the cargo based on the multibody system dynamics. The hydrostatic force, the hydrodynamic force, the wire rope force, and the mooring force are considered as external forces. By solving the equations of the motions with numerical methods, 3 dimensional motions of the cargo and the floating crane are simulated under the various wave directions.
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.
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.
해상 풍력 발전기 리프팅 해석을 위한 해상 크레인 멀티 붐 모델링
박광필(Kwang Phil Park),차주환(Ju Hwan Cha),이규열(Kyu Yeul Lee) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.1
본 논문에서는 해양 풍력발전기를 해상 크레인으로 리프팅하기 위해 두 개의 탄성 붐을 가진 해상 크레인을 모델링 하고 동적 거동을 시뮬레이션 하였다. 운동 방정식은 강체와 탄성체가 포함된 다물체계 동역학을 기반으로 구성하였다. 외력으로는 유체정역학 힘, 규칙파에 의한 유체동역학 힘, 와이어로프의 장력, 계류력, 그리고 중력이 고려되었다. 두 개의 탄성 붐을 사용한 시뮬레이션 결과는 탄성 붐 한 개를 사용한 경우와 비교하여 모델의 타당성을 검증하였다. 5-MW(megawatt)급 해양 풍력발전기를 해상 크레인이 리프팅하는 경우에 대해 동적 거동을 시뮬레이션하고 그 결과를 분석하였다. The dynamic responses of a 5 MW wind turbine lifted by a floating crane with two elastic booms are analyzed. Dynamic equations of motions of a multibody system that consists of a floating crane, two elastic booms, and a wind turbine are derived. The six-degree-of-freedom (DOF) motions for the floating crane and the wind turbine are considered in the equations of motions. The hydrostatic force, the hydrodynamic force due to a regular wave, the mooring force, the wire rope force, and the gravitational force are considered as external forces. By solving the equations numerically, the dynamic responses of cargo are simulated. The simulation results are compared with those in the case of one elastic boom. Finally, the dynamic responses of the wind turbine lifted by the floating crane are analyzed under regular wave condition.
유한요소 붐 모델의 3차원 동적 거동을 고려한 리프팅 해석
박광필(Park, Kwang-Phil),차주환(Cha, Ju-Hwan),이규열(Lee, Kyu-Yeul) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.8
In this paper, the lifting analysis of a floating crane with a shipbuilding block is performed. Since floating cranes are operated in ocean waves, six degree-of-freedom motions are considered in the dynamic equations of motions of the floating crane and the block. The boom of the floating crane is considered as an elastic body in the analysis, and is modeled as three dimensional beam based on the finite element formulation. The hydrostatic and hydrodynamic forces by a regular wave are considered as external forces. By solving the equations of motions numerically, the dynamic responses of the floating crane and the block are simulated. The simulation results with different wave directions are compared and the conditions which cause maximum responses are discussed.