Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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A Study on Accelerated Life Testing Model and Design

헬기용 와이퍼 조립체의 가속모델 및 가속수명시험 설계 연구

  • Kim, Daeyu (Department of Mechanical System Engineering, Kumoh National Institute of Technology) ;
  • Hur, Jangwook (Department of Mechanical System Engineering, Kumoh National Institute of Technology) ;
  • Jeon, Buil (Development Program Management Division, Korea Aerospace Industries)
  • 김대유 (금오공과대학교 기계시스템 공학과) ;
  • 허장욱 (금오공과대학교 기계시스템 공학과) ;
  • 전부일 (한국항공우주산업 개발사업관리본부)
  • Received : 2018.07.10
  • Accepted : 2018.10.05
  • Published : 2018.12.05
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Abstract

In the case of helicopters, the development of parts technology is rapidly changing, and the complexity is rapidly increasing. Particularly, the surge of various electric and electronic systems is recognized as a problem that is directly related to the safety of the helicopter. Due to these problems, there is a growing interest in reliability evaluation in the face of the problem of confirming and certifying the reliability of parts in the development stage. In this paper, the analysis of the failure mechanism of the wiper system was carried out, and the priority and importance of each failure mode were checked by using the results, and major stress factors were derived and the corresponding acceleration model was selected. Also, the accelerated lifetime test time was calculated according to the life test time, acceleration status and acceleration level of the steady state by using the selected acceleration model and characteristic values.

Keywords

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Fig. 1. Components of the wiper system

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Fig. 2. FTA of top-level RPN

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Fig. 3. Effective distance of brush and commutator

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Fig. 4. Wear mechanism of motor shaft and bearing

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Fig. 5. Motor coil insulation example

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Fig. 6. Acceleration factor according to change of temperature and humidity

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Fig. 7. Test time according to change of temperature and humidity(Confidence level : 60 %)

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Fig. 8. Test time according to change of temperature and humidity(Confidence level : 90 %)

Table 1. Top five parts of wiper prediction failure rate

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Table 2. FMEA results of RPN failure modes

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Table 3. Results of accumulator 2Stage QFD level 1

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Table 4. Results of accumulator 2Stage QFD level 2

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Table 5. Acceleration stress, model and acceleration factor formula according to failure mode

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Table 6. Characteristic value of deterioration failure mechanism

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Table 7. Test time according to the number of reliability test samples and confidence level

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Table 8. Acceleration factor according to temperature change

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Table 9. Test time according to change of temperature and humidity(H)

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References

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