전기차 화재 진화를 위한 산업부산물 활용 그라우트 기초연구

박광필,장우식 한국도로학회 2024 한국도로학회논문집 Vol.26 No.2

PURPOSES : This study is conducted to evaluate the development of materials for extinguishing ESS(Energy Storage System) fires in electric vehicles using industrial byproducts. METHODS : Grout containing an appropriate amount of fly ash, silica fume, blast furnace slag powder, and ferronikel slag, which are industrial byproducts, was prepared. The fluidity, stress, and mechanical properties were evaluated in accordance with standard test methods. RESULTS : The fluidity of the materials used for the evolution of ESS fires differed depending on the material of the industrial byproducts. In the case of blast furnace slag, its fluidity is low owing to viscosity even when it content is high, and the use of ferronikelsrag is shown to be suitable for the evolution of ESS fires in fluidity and curing tests. CONCLUSIONS : Fire-extinguishing materials using industrial byproducts require a long curing time but exhibit the fluidity required for ESS fire extinguishment. In particular, the curing and fluidity of Peronikel slag and fly ash are suitable for ESS fire extinguishing.

A study on the key performance indicator of the dynamic positioning system

박광필,조아라,최진우 대한조선학회 2016 International Journal of Naval Architecture and Oc Vol.8 No.5

The dynamic positioning system (DPS) maintains an offshore vessel's position and heading under various environmental conditions by using its own thrust. DPS is regarded as one of the most important systems in offshore vessels. So, efficient operation and maintenance of the DPS are important issues. To monitor the DPS, it is necessary to define an appropriate key performance indicator (KPI) that can express the condition of the DPS from the perspective of operational efficiency and maintenance. In this study, a new KPI for the DPS is proposed considering the efficiency of the machinery and controller, the energy efficiency, and the environmental conditions in which the DPS is operated. The KPI is defined as a function of control deviation, energy consumption, and environmental load. A normalization factor is used to normalize the effect of environmental load on the KPI. The KPI value is calculated from DPS simulation and model test data. The possibility of applying the KPI to monitoring of DPS condition is discussed by comparing the values. The result indicates the feasibility of the new KPI.

신재생에너지 태양광발전 시설물의 풍하중에 의한 취약부분 분석 연구

박광필 한국도로학회 2023 한국도로학회논문집 Vol.25 No.6

PURPOSES : Safety Evaluation of Wind Loads of Renewable Energy and Photovoltaic Power Structures. METHODS : Structural safety evaluation was conducted on the wind load of 3kW Photovoltaic Power Structures using ABAQUS. Wind speed was reviewed for 36m/s and 60m/s. Effective Mass and Mass Contribution of Photovoltaic Power Structures was utilized up to 90%. 7 steps were set and applied to structural analysis. RESULTS : As a result of the structural analysis, it was confirmed that the long-term blowing load was affected rather than the size of the wind load. Weak areas were identified at the point of the horizontal beam rather than the modules of the Photovoltaic Power Structures. In particular, it was confirmed that stress exceeding the allowable stress was generated at the junction. In order to secure the safety of Photovoltaic Power Structures, it is judged that reinforcement of the branch is necessary. CONCLUSIONS : The safety of Photovoltaic Power Structures structures for wind load is influenced by persistence rather than the size of the wind load. Therefore, in order to prevent this, it is judged that reinforcement of the branch is necessary

Development of transporter training simulator based on virtual reality and vehicle dynamics model

박광필,함승호,이우용,유병우 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-

A transporter is a means of transportation that is widely used in heavy industries to move heavy loads called blocks. Because the transporter has a more complex operating system compared to the regular car, it takes a lot of time to become familiar with its operation. However, it is not easy to find a proper place and a transporter for training operators. As a result, the number of accidents caused by the operator's inexperience, such as block drops or collisions, is increasing every year. Therefore, in this study, a transporter training simulator based on virtual reality is developed to allow transporter operators to be trained anytime, anywhere without considering actual transporter and a special training place. This training simulator is composed of five modules. The first module is models of the transporter and the shipyard to be displayed in virtual reality. The second is implementation of the transporter operations such as lifting, lowering, and moving wheels. The third is vehicle dynamics model to implement realistic movement of the transporter. The fourth is the network function to simulate collaboration among workers. The fifth is the scenario module to simulate work situations that are similar to actual ones. By using the developed simulator, a scenario where the signalman and the operator collaborate to transport a block is successfully conducted.

Real-time ship stability evaluation program through deterministic method based on second-generation intact stability

박광필,구자훈,이재용,구남국 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-

IMO suggests Second-Generation Intact Stability Criterion (SGISC), which consists of five failure modes, because of continuous accidents due to a lack of ship stability. In this study, Level 1 and Level 2 stability of SGISC were evaluated for three stability failure modes (Dead Ship Condition, Surf-riding, and Excessive Acceleration). Level 1 was calculated in the same way as the second-generation intact stability calculation method, and Level 2 was calculated in a deterministic manner by using a real-time maritime environment rather than a probabilistic approach for all maritime environments. Based on this, a program was developed to visualize dangerous and safe areas on a map. Using the developed program, it is expected that SGISC can be used not only in the design stage, but also in the operation stage of ships, such as route planning or selection of operating locations in the ocean.

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.

MICROSPHERES OF BIODEGRADABLE POLYPEPTIDE FOR DRUG DELIVERY SYSTEM

박광필,박정웅,조종수,이강춘 한국고분자학회 1988 한국고분자학회 학술대회 연구논문 초록집 Vol.1988 No.10

해양플랜트 대상 VR 파노라마 시스템 개발

박광필,조아라 대한조선학회 2017 大韓造船學會誌 Vol.54 No.3

Development of offshore drilling platform simulation for virtual onboard experience

박광필,함승호 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1

As marine resources have been actively explored, a large number of offshore drilling platforms such as drillships and semi-submersible rigs have been built in many shipyards. The drilling system is the key feature that defines the characteristics of the platform. The operation of the drilling system is usually focused on the tubular handling, hoisting, and rotating systems which are directly handling drilling pipes and risers on the drill floor. Therefore, most of the training simulators have been developed only for controlling the drilling equipment. However, not only the drilling equipment handling on the drill floor, but also compensations systems such as heave compensation system and DPS (Dynamic Positioning System) to reduce the effect of the motion, ROV (Remotely Operated Vehicle) operation, well control including BOP (Blow-Out Preventer) should be integrated systematically because these systems on the offshore drilling platform are operated at the same time. Therefore, we propose the integrated offshore drilling platform simulation for virtual onboard experience which is composed of a virtual driller's cabin for handling drilling equipment, well control simulator to remove a kick, DPS simulator to control the motion of the platform, walk-through simulator to monitor the operation from the worker's viewpoint on the platform, and dynamic analyses of heave compensation system. All data such as the movement of the drilling equipment, platform position, driller's command, etc. are shared among systems in real-time. The proposed virtual offshore drilling platform can effectively show the various situations that occur during drilling operations.

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.