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김덕현(Deok Hyun Kim),이인수(In Su Lee),차춘남(Chun Nam Cha) 한국산업경영시스템학회 2020 한국산업경영시스템학회지 Vol.43 No.1
To enhance the effectiveness of the FMS (flexible manufacturing system), it is necessary for the manufacturing control system to be upgraded by integrating the cyber and the physical manufacturing systems. Using the CPPS (Cyber-Physical Production System) concept, this study proposes a 4-stage vertical integration and control framework for an aircraft parts manufacturing plant. In the proposed framework, the process controller prepares the operations schedule for processing work orders generated from the APS (advanced planning & scheduling) system. The scheduled operations and the related control commands are assigned to equipments by the dispatcher of the line controller. The line monitor is responsible for monitoring the overall status of the FMS including work orders and equipments. Finally the process monitor uses the simulation model to check the performance of the production plan using real time plant status data. The W-FMCS (Wing rib-Flexible Manufacturing Control & Simulation) are developed to implement the proposed 4-stage CPPS based FMS control architecture. The effectiveness of the proposed control architecture is examined by the real plant’s operational data such as utilization and throughput. The performance improvement examined shows the usefulness of the framework in managing the smart factory’s operation by providing a practical approach to integrate cyber and physical production systems.
Automated Guided Vehicles Dispatching in Flexible Manufacturing System
Hui-Sang Lee,Lin LIn,Mitso Gen 대한산업공학회 2008 대한산업공학회 추계학술대회논문집 Vol.2008 No.11
Recently, the automated guided vehicles (AGVs) dispatching has received considerable attention in technical literature on flexible manufacturing system (FMS). The AGVs dispatching as well as the scheduling of operations is essential factor contributing to the efficiency of the overall FMS. In this paper, we focused on the simultaneous scheduling and dispatching AGVs in a FMS. We proposed an effective evolutionary approach for solving AGVs dispatching problems, minimizing the makespan, the number of AGVs and the mean tardiness. For this multiobjective problem, priority-based encoding method and adaptive weight Genetic Algorithm (awGA) were addressed. And numerical results show the effectiveness of proposed approach.
실습 교육용 유연 생산시스템 설계 및 제작에 대한 연구
조장현 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.3
This is the research report concerned with designing and making of the flexible manufacturing system for educational training. The flexible manufacturing system is composed of several mechatronic(mechanical and electronic) subsystems which are automatically controlled by computer program. The main subsystems are materials feeder unit, automatic guided vehicle, robot for moving parts, indexing and stamping unit and computer system and more subsystems can be added for specific manufacturing processes. This dissertation includes the design and production characteristics of flexible manufacturing system for educational training. Finally, the educational training equipment is made and demonstrated in this research and is expected to use in various educational institutions, for example, technical educational and practical industrial training institutions.
듀얼 조향구동 장치를 갖는 포크리프트 타입 무인운반차(AGV)의 개발
원창연(Chang-Yeon Won),강선모(Seon-Mo Kang),남윤의(Yoon-Eui Nahm) 한국산업경영시스템학회 2021 한국산업경영시스템학회지 Vol.44 No.4
Automated Guided Vehicle (AGV) is commonly used in manufacturing plant, warehouse, distribution center, and terminal. AGV is self-driven vehicle used to transport material between workstations in the shop floor without the help of an operator, and AGV includes a material transfer system located on the top and driving system at the bottom to move the vehicle as desired. For navigation, AGV mostly uses lane paths, signal paths or signal beacons. Various predominant sensors are also used in the AGV. However, in the conventional AGV, there is a problem of not turning or damaging nearby objects or AGV in a narrow space. In this paper, a new driving system is proposed to move the vehicle in a narrow space. In the proposed driving system, two sets of the combined steering-drive unit are adopted to solve the above problem. A prototype of AGV with the new driving system is developed for the comparative analysis with the conventional AGV. In addition, the experimental result shows the improved performance of the new driving system in the maximum speed, braking distance and positioning precision tests.
Siti Zawiah Md Dawal,Farzad Tahriri,Yap Hwa Jen,Keith Case,Nguyen Huu Tho,Aliq Zuhdi,Maryam Mousavi,Atefeh Amindoust,Novita Sakundarini 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
This paper presents significant empirical evidence on the relationship between Advanced Manufacturing Technology (AMT) practices and sustainable environmental initiatives with the manufacturing capabilities of automotive SMEs in Malaysia. A cross-sectional survey is adopted in this study, which involves 83 Malaysian automotive SMEs. Two hypotheses are proposed in this study, i.e. Hypothesis 1: There are positive effects of AMT practices on the manufacturing capabilities of SMEs and Hypothesis 2: There are positive effects of sustainable environmental initiatives on the manufacturing capabilities of SMEs. The results obtained from the pairwise correlation analysis indicate that both AMT practices and sustainable environmental initiatives have positive effects on manufacturing capabilities, which support both hypotheses. In addition, it is found that 50% of the SMEs implement AMT for flexibility and cost reduction in the past five years. It is also found that more than 80% sustainable practices are adopted in most of the SMEs with the exception of Life Cycle Assessment. Based on the findings, there is a need to move forward into the hybrid approach, which will consider both AMT practices and environmental initiatives to ensure that SMEs remain competitive and become the world player in the automotive industry.
생산 흐름 분석을 통한 FAS라인의 최적 배치 설계에 관한 연구
가춘식(Chun Sik Ga),정진휘(Jinhwi Jung),장봉춘(Bong-Choon Jang),엄용균(Yong-Gyun Eom) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Many mid-sized companies in Korean automotive industry have attempted to solve the lack of human power, to control the quality of components, to improve the production rate, and to innovate the manufacturing line. The goals of this study are to analyze the production rate of an automotive component manufacturing line using simulation software, to construct a Flexible Automation Subassembly (FAS) system and to suggest an optimized layout design using FAS line. In this research, the simulation model for manufacturing line was developed and used the realistic data (production planning, component type, working order, process time, queue time, line rules, etc) of a medium sized company in Korean automotive industry. To complete this research, a simulation software 'ARENA' was used.