• 한국경영과학회:학술대회논문집
• /
• 대한산업공학회/한국경영과학회 1995년도 춘계공동학술대회논문집; 전남대학교; 28-29 Apr. 1995
• /
• pp.776-782
• /
• 1995

This paper presents a methodology for development of a heterarchical control system in Flexible Manufacturing Systems (FMS) environment. A Petri net based model is applied for development of control software. A real-time scheduling methodology for the heterarchical system is also developed and it is used as a software entity in the overall architecture. The partition of generic and specific modules in control software development is emphasized. The control system performs its control tasks in two stages: (1) generation of generic control code and distribution of them to each controller entity prior to system execution; (2) generation of specific control code according to job arrival and its process plan. The control software and the scheduling algorithm are evaluated by a simulation program.

• 한국경영과학회:학술대회논문집
• /
• 한국경영과학회 1987년도 추계학술발표회 발표논문초록집; 중소기업협동조합중앙회, 서울; 31 Oct. 1987
• /
• pp.24-25
• /
• 1987

• 한국경영과학회:학술대회논문집
• /
• 한국경영과학회 1993년도 추계학술대회발표논문집; 서강대학교, 서울; 25 Sep. 1993
• /
• pp.111-111
• /
• 1993

• 한국경영과학회:학술대회논문집
• /
• 대한산업공학회/한국경영과학회 1994년도 춘계공동학술대회논문집; 창원대학교; 08월 09일 Apr. 1994
• /
• pp.249-249
• /
• 1994

• 한국경영과학회:학술대회논문집
• /
• 대한산업공학회/한국경영과학회 1994년도 춘계공동학술대회논문집; 창원대학교; 08월 09일 Apr. 1994
• /
• pp.250-250
• /
• 1994

• 대한산업공학회지
• /
• 제24권1호
• /
• pp.61-76
• /
• 1998

Tooling is now considered as a major limiting resource for highly automated manufacturing systems to be operated unattendedly. In this paper, various issues in tooling are introduced and discussed. The importance of appropriate selection of tooling strategies is discussed and simulation experiments are performed to see how the tooling strategies affect the system performance in automated manufacturing systems. This paper also presents a tool management system developed in Korea Institute of Machinery and Materials.

• 한국정밀공학회지
• /
• 제11권1호
• /
• pp.20-31
• /
• 1994

FMS(Flesible Manufacturing System), FMX(Flexible Manufacturing Cell)와 같은 유연 생산시스템 뿐만 아니고 공장자동화(FA)의 최하위 단위인 절삭가공 공작기계에 대한 무인화의 실현은 머지않은 장래에 완성될 IMS(Intelligent Manufacturing System)시스템이 구축에 있어서 최대의 걸림돌이 되고 있다. 전통적인 생산시스템에서는 경험을 가진 작업자에 의해 절삭공정이 감시되어지며, 만약 이상이 발생했을 때에는 그 상태에 따른 적절한 조치를 즉시 취할 수 있었다. 그러나 급속도로 연구가 진행되는 무인생산 시스템에서는 이러한 작업자의 역할이 컴퓨터에 의한 자동적인 감시 및 제어 시스템으로 대체되어야 한다. 이러한감시활동 중에서도 공구마모 및 파단의 검출은 효율적인 공구교환정책, 가공물의 품위유지 및 공구와 공작기계의 보호를 위해서 가장 중요한 부분으로 취급되고 있다.

• 한국생산제조학회지
• /
• 제21권1호
• /
• pp.175-181
• /
• 2012

This paper presents a novel dynamic vibration absorber (DVA) to suppress the unbalance response of flexible rotor-bearing systems. The DVA unit consists of two DVAs, an adapter to place the DVAs and an adapter frame to locate the adapter. The essential feature of the proposed DVA unit is to place itself on any desirable location of the shaft without disassembling the rotor-bearing system under consideration. A simulation with a 3D element based commercial rotor dynamic software is made to test the possibility of the proposed DVA on the suppression of unbalance response in rotor-bearing systems. Experiments are performed to validate the proposed DVA unit. The simulation and experiments show that the proposed DVA unit is very effective to suppress the unbalance response in rotor-bearing system at designated rotational speeds of interest.

• International Journal of Precision Engineering and Manufacturing
• /
• 제6권4호
• /
• pp.21-25
• /
• 2005

In the dynamic analysis of a mechanism, if one or more of the components are flexible, then the simulation will not be accurate because of the violation of the rigid body assumption. Mode shapes are used to represent the dynamic behavior of an elastic structure. A modal synthesis method which uses a combination of normal modes, constraint modes, and attachment modes, was used to represent effectively the elastic deformation of a flexible multibody. Since the combination of these modes should be different for each type of connecting part, the modal synthesis method was studied for the various types of interconnecting joints. In addition, the analysis procedure for the flexible body was explained. A satellite system with flexible solar panels was chosen as an example to show the effectiveness of the proposed method.

• Journal of Information Processing Systems
• /
• 제15권1호
• /
• pp.181-188
• /
• 2019

A production system is a management system that supports all activities to perform production operations at the manufacturing site. From the point-of-view of a smart factory, smart manufacturing systems redesigned the concept of onsite production systems to fit the entire system and its necessary functional composition. In this study, we select the key functions needed to build a smart factory for a PCB line and propose a new six-step model for the deployment of a smart manufacturing system by integrating essential functions. The smart manufacturing system newly classified the production and operation tasks of PCB manufacturing and selected necessary functions through requirement analysis and benchmarking of advanced companies. The selected production operation tasks are mapped to the functions of the system and configured into seven modules, and the optimal deployment model is presented to allow flexible responses to the characteristics of the tasks. These methodologies are first presented in this study, and the proposed model was applied to the PCB line to confirm that they had significant changes in the work method, qualitative effects, and quantitative effects. Typically, lead time and WIP have reduced by about 50%.