가속시험법을 활용한 자동차용 워터펌프 베어링의 수명특성에 관한 연구
A Study on the Life Characteristic of an Automotive Water-pump Bearing Using the Accelerated Test Method
0
조회
0
다운로드
4
인용
0
참고문헌
키워드
초록
A water-pump located in the cooling area of a car circulates cooling water. A particular bearing element, known as a water-pump bearing, installed in the rotating part carries the entire load. The failure of this waterpump bearing has a direct impact on the failure of the automobile engine, and so securing its reliability is crucial. Several researchers have examined the design principles of the water-pump bearing, but there are no reports on the life characteristic of the bearing yet. Herein, we report the construction of test equipment to reproduce the spalling of the roller contact, which is the main failure mode of the chosen water-pump bearing. We chose the radial load as an accelerated stress factor and validated the failure mode by monitoring the surface defects. We conducted the accelerated life test after determining the accelerated stress level through a combination of finite element analysis and a preliminary test. In the life tests, we used an accelerometer to perform failure diagnosis. In the last stage of this study, we present a statistical reliability analysis. Thus, we fully estimated the shape parameter of the waterpump bearing, accelerating level on the load , and the lifetime (MTTF and B10 life) under real use conditions, and finally proposed an interval estimation value considering the uncertainty of the estimated value.
Abstract
A water-pump located in the cooling area of a car circulates cooling water. A particular bearing element, known as a water-pump bearing, installed in the rotating part carries the entire load. The failure of this waterpump bearing has a direct impact on the failure of the automobile engine, and so securing its reliability is crucial. Several researchers have examined the design principles of the water-pump bearing, but there are no reports on the life characteristic of the bearing yet. Herein, we report the construction of test equipment to reproduce the spalling of the roller contact, which is the main failure mode of the chosen water-pump bearing. We chose the radial load as an accelerated stress factor and validated the failure mode by monitoring the surface defects. We conducted the accelerated life test after determining the accelerated stress level through a combination of finite element analysis and a preliminary test. In the life tests, we used an accelerometer to perform failure diagnosis. In the last stage of this study, we present a statistical reliability analysis. Thus, we fully estimated the shape parameter of the waterpump bearing, accelerating level on the load , and the lifetime (MTTF and B10 life) under real use conditions, and finally proposed an interval estimation value considering the uncertainty of the estimated value.
참고문헌 (9)
- 양철호, "유한요소해석을 이용한 워터펌프 베어링돌출 설계 개선", 한국자동차공학회 논문집, 14(3), pp.164~169 (2006), 한국자동차공학회
- Li, Z., "Load Calculation and Life Prediction for Auto Water Pump Bearing", J. Tribol, 134(4), pp.41103~ (2012)
- Ronald L. Eshleman, "Machinery Vibration Analysis I", pp.80~82 (2000), VIPress, Inc.
- Bertsche, B., "Reliability in Automotive and Mechanical Engineering" (2008), Springer
- Yang, G. B., "Life Cycle Reliability Engineering" (2007), John Wiley & Sons, Inc.
- Abernethy, R. B., "The New Weibull Handbook" (2004), Abernethy, Robert B.
- NSWC, "Handbook of Reliability Prediction Procedures for Mechanical Equipment"" (2007), Naval Surface Warfare Center
- "Weibull Database"[URL]
- ReliaSoft, "Accelerated Life Testing Reference" (2001), Relia-Soft Publishing