• 대한안전경영과학회지
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• 제23권1호
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• pp.65-70
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• 2021

Domestic as well as global automobile manufacturers are making greater efforts in cost reduction to strengthen the competitiveness. In this study, we developed a program to effectively manage standard time of automobile assembly line, and confirm based on A-automobile factory data. For the purpose, we develop the system which is possible to manage standard time as well as calculate man-hour for automobile assembly line.

• 한국CDE학회논문집
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• 제17권1호
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• pp.35-44
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• 2012

Many automobile manufacturers are doing experiment on manufacturing environments by using an augmented reality technology. However, system layout and process simulation by using the virtual reality technology have been performed actively more than by using the augmented reality technology in practical use so far. Existing automobile assembly by using the augmented reality requires the precise calibrating work after setting the robot because the existing augmented reality system for the automobile assembly system configuration does not include the end tip deflection and the robot joints deflection due to the heavy weight of product and gripper. Because the robot is used mostly at the automobile assembly, the deflection problem of the robot joint and the product in the existing augmented reality system need to be improved. Moreover camera lens calibration has to be performed precisely to use augmented reality. In order to improve this problem, this paper introduces a method of the software based calibration to apply the augmented reality effectively to the automobile assembly system. On the other hand, the camera lens calibration module and the direct compensation module of the virtual object displacement for the augmented reality were designed and implemented. Furthermore, the developed automobile assembly system oriented AR-system was verified by the practical test.

• 대한산업공학회지
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• 제27권1호
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• pp.95-102
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• 2001

The design of automobile body assembly line is one of essential parts for improving the process performance. The major objective of this research is to develop a performance evaluation model for automobile assembly line using a closed queueing network(CQN) and simulation method. In this study we used a two-step approach to compute the performance of the assembly line : first, we used CQN model considering assembly line equipments and the line operating time under the assumption of no failure, and second we used a well-known simulator FACTOR/AIM. Finally we implemented this model on a K automobile company and we have shown the sample results of automobile body assembly line.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1998년도 춘계학술대회논문집
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• pp.31-35
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• 1998

Many reaearchers have reproted that poor body postures are associated with pains or symptoms of musculoskeletal dissoders. Therefore, the ergonomic evaluation of postural stresses as well as biomechanical stresses is important when a job such as automobile assembly tasks involves highly repetitive and/or prolonged poor body postures. A macropostural classification shema was developed to characterise various body postures occurring in automobile assembly tasks in the study. To specify a postural code and stress level to each body posture, perceived joint discomforts were subjectively evaluated in the lab experiments for the full range of motion in five human body joints. Based on the reaults, a postural classification scheme was developed where the full range of motion in each body joint was classified into several codes repressenting different stress levels. The automobile tasks were clustered into 12 types based on the result walk-in-surveillance and the possible posture codes for each task type are defined. I was exposed that the poor postural problems in automobile assembly tasks were concerned in most part with arms, trunk and neck. Application of te developed schema to seven operations in automobile assembly tasks showed that the schema can be used as a tool to identify the operations and tasks involving highly stressful body postures. The schema can also be utilised as a basis to prioritise the candidate assembly operations for redesign of work methods.

• 한국정밀공학회지
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• 제23권11호
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• pp.68-77
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• 2006

Nowadays, the increasing global competition forces automobile manufacturer to increase quality and to reduce the cost and time for manufacturing planning. To solve these problems, automobile manufacturers try to apply digital manufacturing technologies. In this paper, a concept of method for planning the digital assembly system is proposed. Based on the requirements of assembly tasks obtained through product analysis, the function and sequence modeling for assembly process is executed using the IDEF0 and UML model. For implementation of digital assembly system, the selected components are modeled by using 3D CAD tools. According to the system configuration strategy, lots of the alternative solutions for the assembly system are generated. Finally, the optimal assembly system is chosen by the evaluation of the alternative solutions with TOPSIS(Technique for Order Preference by Similarity to Ideal Solution) method. According to proposed procedure, digital laser welding system is implemented in DELMIA.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1998년도 춘계학술대회논문집
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• pp.36-39
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• 1998

In this study, the postural stresses in automobile assembly tasks were evaluated through an experiment. We had 19 subjects who simulated 42 different working postures occuring in the automobile assembly tasks for1 min and rated their whole body discomforts subjectively. We sued a free modulus magnitude estimation technique, commonly used as a psycophysical rating technique, and fully trained the subjects for the technique. The postures were selected through the analysis of the characteristics of te automobile assembly tasks and the expected difficulties. The subjective discomfort rating data were normalized by min-max standardization method. The consistency of the rating data was guaranteed by the analysis of spear man rank-order. The postures were ranked on their ratings and the relationships between the whole body discomfort ratings, and joint discomfort ratings were analysed. It is expected taht a system for evaluating postural stresses, which was specific to automobile assembly tasks, can be developed based on the relationship and can also be expended to a general purpose system with a minor modification.

• 대한안전경영과학회지
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• 제6권2호
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• pp.67-78
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• 2004

In the trim line of an automobile assembly process, 52.9% of the subjects complained the shoulder and low back pain simultaneously. The Alexander Technique is an educational method which shows people how they are misusing their bodies and how their daily habits of work can be harmful. It also teaches people how to avoid work habits which create excessive amounts of static work and how to reduce the amount of unnecessary muscular force they are applying to their bodies. The purpose of this paper is to investigate the importance of repetitive strain injury on automobile assembly line process and contribute reducing the repetitive strain injury through Alexander Technique.

• 산업공학
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• 제18권2호
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• pp.136-147
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• 2005

This paper introduces a simulation study regarding the operation of the Painted Body Storage (PBS) in an automobile factory. In the paint shop of the factory, same colored bodies are grouped together in order to increase the effectiveness of process, for example decrease the loss of cleaning the painting-gun when the color of body changes from one to another. However the production of automobiles in the assembly shop is a typical example of the mixed model assembly production. Therefore PBS locates between the paint shop and the assembly shop for control the input sequence of bodies to the assembly shop, and it enables to meet the smoothing requirement of assembly sequence. There are highly restricted constraints on the assembly sequence in a assembly shop. Those are spacing restriction and smoothing restriction. If such restrictions are violated, conveyor-stop or utility work will be necessary. Thus the major objective of PBS is to control the assembly sequence in a way to meet the two restrictions. In this paper a case study of PBS in an automotive factory is introduced. The storage/retrieval algorithms are suggested and the proposed system is verified using simulation models. Sensitivity analysis for operating factors is also conducted.

• 대한지리학회지
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• 제50권6호
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• pp.621-639
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• 2015

1990년대 후반 이후 완성차 메이커의 구조조정, 외국 부품공급업체의 국내진출, 글로벌 차원에서의 부품조달, 산업의 IT화에 따른 개방적 부품 조달체계의 확산, 그리고 모듈화 등이 수직적인 부품조달체계를 완화시키는 요인으로 작용하고 있다. 이와 같은 완성차 생산의 내외 환경변화에 따라 본 연구에서는 완성차 조립공장에 1차 공급업체와 모듈기업이 공급하는 부품의 지역적 물류체계가 어떻게 이루어지고 있는가를 밝히는 것을 목적으로 기존문헌 및 인터뷰 조사를 실시했다. 그 분석결과는 다음과 같다. 완성차 부품공급의 지역적 물류체계는 완성차 조립공장을 중심으로 공장 내에나 인접지역에 모듈공장이 입지하는데, 1차 공급업체의 부품은 근접권에서 살펴본 바와 같이 공급의 분산비율이 비교적 높게 나타나 JIT의 다빈도 소량배송보다는 자동차 조립공장 인근에 통합물류센터를 설치해 부품을 공급하고 여기에서 다시 조립공장에 납품을 한다. 이렇게 함 으로서 부품공급업체나 조립공장 모두에게 배송비용을 줄여주고 부품의 안정적인 공급이 이루어지기 때문에 중층적인 모듈 반제품을 위한 부품공급도 이와 같은 방식을 취한다.

• 한국산학기술학회논문지
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• 제20권8호
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• pp.657-661
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• 2019

자동차 산업은 전 세계적으로 매출액이 1조 달러가 넘고 1천만 명 이상을 고용하고 있는 세계최대 제조업으로서, 약 2만 여개의 부품으로 완성되는 복합적 성격의 대표적인 산업이며 자동차 조립공정은 도장된 차체에 약 3천여 종의 내장, 계기판, 시트, 유리, 엔진, 트랜스미션, 차축 등의 유닛(Unit)을 조립하는 노동집약적 공정으로, 타 공정에 비해 자동화 비율이 가장 낮은 특징을 가지고 있다. 또한, 현재의 자동차 조립공정은 작업자의 조립작업에 대한 실시간 모니터링이 이루어지고 있지 못한 실정으로, 작업자의 작업 공구위치 측정시스템의 도입을 통해 공구의 위치를 실시간으로 파악하고 분석하여 일관된 작업 순서를 지시하면서 작업의 누락 및 가감을 체크한다면, 자동차 제조공정에서 발생할 수 있는 불량을 사전에 차단하여 조립공정의 생산성 및 품질향상을 이룰 수 있다. 따라서 본 논문에서는 작업자의 작업공구 위치 측정 시스템의 도입을 통해 일관된 작업 순서를 지시하면서 작업의 누락 및 가감을 체크하고, 제조공정에서 발생할 수 있는 조립불량을 사전에 차단하여 조립공정의 생산성 및 품질향상을 이룰 수 있는 실시간 공구 위치추적 시스템의 구성을 위하여 UWB(Ultra Wide Band) 무선측위를 활용한 공구의 실시간 위치추적시스템을 개발하고 그 효용성을 증명하고자 한다.