Fig. 1. Components of the wiper system
Fig. 2. FTA of top-level RPN
Fig. 3. Effective distance of brush and commutator
Fig. 4. Wear mechanism of motor shaft and bearing
Fig. 5. Motor coil insulation example
Fig. 6. Acceleration factor according to change of temperature and humidity
Fig. 7. Test time according to change of temperature and humidity(Confidence level : 60 %)
Fig. 8. Test time according to change of temperature and humidity(Confidence level : 90 %)
Table 1. Top five parts of wiper prediction failure rate
Table 2. FMEA results of RPN failure modes
Table 3. Results of accumulator 2Stage QFD level 1
Table 4. Results of accumulator 2Stage QFD level 2
Table 5. Acceleration stress, model and acceleration factor formula according to failure mode
Table 6. Characteristic value of deterioration failure mechanism
Table 7. Test time according to the number of reliability test samples and confidence level
Table 8. Acceleration factor according to temperature change
Table 9. Test time according to change of temperature and humidity(H)
References
- Department of Defense, "Defense Force Development Business Instruction," pp. 62-63, 2018.
- Wae-Gyeong Shin, Soo-Hong Lee, Young-Sik Song, "The Reliability Life Test Design and Analysis of Wiper Motor for Automobiles," KSAE Annual Spring Conference, pp. 1968-1973, 2006.
- SungJae Lee, YoonKi Kim, ChangHoon Lee, HongWoo Im, "How to Determine Reliability Test Items First through FMEA and QFD," Proceedings of the Korea Reliability Society Conference, pp. 74-81, 2016.
- Agency for Technology and Standards, "Wiper Motor for Automotive," pp. 2-7, 2003.
- Agency for Technology and Standards, "Wiper Blade for Automobiles," pp. 5-9, 2003.
- Agency for Technology and Standards, "Wiper Arm for Automobiles," pp. 3-8, 2003.
- Agency for Technology and Standards, "Wiper System for Automobiles," pp. 4-9, 2003.
- Hakyong Eom, Shinhwan Wei, Hyungmin Kim, Heebok Lee, "A Study on Accelerated Life Test Method of Blower Motor," KSAE Annual Spring Conference, pp. 1619-1624, 2011.
- Hakyong Eom, Sungok Kim, Shinhwan Wei, Sangwook Park, Gyuro Kim, "Development of Accelerated Life Test Method for Brush Wear of the Vehicles DC Motor," KSAE Annual Spring Conference, pp. 2003-2008, 2010.
- Kyungteak Lee, Shinhwan Wi, Hyungmin Kim, Heebok Lee, "Development of Accelerated Test Method for Noise Failure Mode of Automobiles DC Motor," KSAE Annual Spring Conference, pp. 2009-2014, 2010.
- Tae-Gu Lee, Jong-Sun Moon, Hoseon Yoo, Jae- Heon Lee, "Thermal Reliability Analysis of BLDC Motor in a High Speed Axial Fan by the Accelerated Life Test," Korean Journal of Air-Conditioning and Refrigeration Engineering, 17(12), pp. 1169-1176, 2005.
- Andre Kleyner and Joseph Boyle, "Demonstrating Product Reliability Theory and Application," pp. 1-5, 2002.
- IlYoung Yang, JunGu Kang, SangWoo Yu, GeunTae Oh, YoonGyoon Na, "Development of Accelerated Life Test Method for Constant Electrical Potential Electrolysis Gas Sensor," Journal of Applied Reliability, 16(3), pp. 180-191, 2016.