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이성(Xing Li),구남국(Namkug Ku),하솔(Sol Ha),노명일(Myung-Il Roh),황호진(Ho-jin Hwang) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
This study focuses the prediction of the dynamic response of a floating offshore wind turbine (FOWT) in frequency domain. In this study, the concept of multi-body systems dynamics and numerical analysis methodology are introduced, and the nonlinear equations are solved by using the Matlab/Simulink interface. As an example, the non-linear equations of motion of double pendulum are first derived, and then the equations of motion are linearized. Dynamic response analysis of the double pendulum is carried out in time domain, and frequency domain, using the non-linear equations and linearized equations, respectively, and the applicability of this methodology are verified. The result shows that the methodology can be used to evaluate the dynamic response of floating structures such as FOWT in frequency domain.
조선소 생산 작업 지원을 위한 VR 기반 협업 시뮬레이션에 관한 연구
이성(Xing Li),함승호(Seung-Ho Ham),조로만(Luman Zhao),하솔(Sol Ha),노명일(Myung-Il Roh) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
In shipbuilding production, several types of cranes are simultaneously used to effectively handle a building block which is more than hundred tons. For this, one or more operators operate each crane, and the cooperation among the operators is very important. In the previous studies, the maximum tension of wire ropes of the cranes and motion of the block were analyzed computationally during lifting operation based on fixed scenarios with simulation. This couldn’t reflect the interaction during the operation which can cause unexpected results. Therefore, a collaborative simulation system for production in shipyard was developed in this study. The developed system is comprised of three parts. The first part is an input device which generates signals such as hoisting up and down of the wire ropes of the cranes. The second part is a dynamics engine which receives the signals from several operators and reflects them as a simulation scenario. The last part is a display device which is used to share simulation results between the workers and visualizes the simulation results in multi-views on the network. Finally, the developed system was applied to a block erection process which is operated by three crane operators and one commander. As a result, it is shown that the developed system can be used to simulate or train the collaborative work of the operators in shipyard.
조선 해양 분야 적용을 위한 해석, 하드웨어 및 가시화 기반의 실시간 시뮬레이션 방법
함승호(Seung-Ho Ham),노명일(Myung-Il Roh),이성(Xing Li),조로만(Luman Zhao) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.하계
Recently, interests of ship and offshore simulators are increased for the purpose of design, production, training, engineering, safety assessment, and so on. Basically, three different kinds of technologies are required to develop such simulators in the field of naval architecture and ocean engineering; physics-based analysis, hardware, and virtual reality. In this study, a real-time simulation method based on analysis, hardware, and visualization is proposed. For this, an integrated simulation framework is proposed. To check the applicability of the proposed method, it is applied to motion analysis of a drillship. The result shows that the proposed method can be used for various purposed in the field of naval architecture and ocean engineering.