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유기훈(KiHoon Yoo),박부희(BooHee Park),김기태(KiTae Kim),김기영(GiYoung Kim),김달석(DalSeok Kim),장중순(JoongSoon Jang),한창수(ChangSu Hahn),조한삶(Hansam Cho) 한국신뢰성학회 2011 신뢰성응용연구 Vol.11 No.1
BLDC(Brushless Direct Current) motor is a powerful device to control the automotive electronic components used in green cars such as HEV/EVs(Hybrid Electric Vehicle and Electric Vehicle). This study is to propose reliability test items derived through pretesting, suitability analysis abd classification of previous BLDC motor tests. For environmental stress tests are determined by analysing environmental conditions and relevant failure mechanisms induced by climate loads, mechanical loads, chemical loads, etc. ATL and HALT are also considered for life testing and screening.
우주용 Hybrid DC-DC Converter 신뢰성 예측
김기태(Kitae Kim),김달석(Dalsuk Kim),박부희(Boohee Park),안정진(Jungjin Ahn),김종만(Jongman Kim),장중순(Joongsoon Jang) 한국신뢰성학회 2010 신뢰성응용연구 Vol.10 No.3
The reliability prediction analysis is a feedback tool that designer uses to provide insight into the component designs. This insight may indicate sensitive components within the design. This paper examines predicted failure rates for hybrid dc-dc converter for spacecraft using MIL-HDBK-217F prediction methodology. The results from part count/stress analysis represent priority components that affect the converter failures. The high priority components are analyzed to find out stress factor based on MIL-HDBK-217F. This information provides an opportunity for designer to improve the reliability of the product in development process.
워크플로우 관리 시스템 기반의 FRACAS 프로세스 개발
이재훈(JaeHoon Lee),김기영(GiYoung Kim),설동진(DongJin Seol),김선진(SeonJin Kim),박부희(BooHee Park),정기윤(KiYun Jeong),김성곤(SeongGon Kim),이춘범(ChunBeom Lee),장중순(JoongSoon Jang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Failure reporting, analysis, and corrective action system (FRACAS) is a closed-loop procedure for analysis and correction of root failure causes of system, product or service. In this study, we use workflow management system (WfMS) for developing and implementing FRACAS process. WfMS authorizes failure engineers to manage their processes in addition to providing fundamental FRACAS functions such as document management, failure reporting and failure analysis. On the basis of WfMS, failure engineers can design FRACAS processes with process designer, and the processes can be modified and customized. WfMS also makes a role of framework for integrating failure analysis system and database management system. We develop prototype FRACAS process using open-source WfMS to represent that proposed methodology is improved in terms of system functionality and extensibility.
신뢰성 평가 기반의 자동차용 에어컨 컴프레서 볼 베어링 수명 모형 개발 사례연구
원승현(Seunghyun Won),오동석(Dongseok Oh),박만희(Manhee Park),오성택(Sungtaeg Oh),박부희(Boohee Park) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The air-condition compressor applied to the vehicle is operated by belt assembly(assembly, ass’y) connected to engine crank pulley. The belt tension generated by the engine during driving is applied to the air-condition compressor pulley as a hub load. The hub load applied at this time reduces the life of the compressor pulley bearing, and the model of the bearing design life using this principle is the Palmgrens model. However, the Palmgrens model is a bearing life prediction model published in the 1950s, and ISO 281:1977 since 1970s proposed a bearing life model using correction factor, and it was revised a total in 3 times in 1990 and 2007. The proposed bearing life model in ISO standard is first determined by the viscoelasticity(viscosity) of the lubricant, and the life model using the correction factor is determined by the material which is the design factor of the bearing. We found that the relationship between bearing design life and bearing field claim ratio is very low for compressor applied by our company. Therefore, based on reliability life test, the life data is analyzed to derive correction factor and a bearing design life model is developed using the derived correction factor.