This paper studies on the effect of kurtosis on fatigue life. A typical vibration test machine uses a normal distribution signal. However, the vibration signal generated in the actual operating environment is a non-normal distribution signal with kurtosis. In this paper, a signal which has the same power spectral density, but has different kurtosis is generated using the Zero Memory Non-Linear (ZMNL) method. The power spectral densities of these two signal will coincide within ±3dB. Fatigue damage spectrum(FDS) computed with a normal distribution signal and FDS computed with a non-normal distribution signal generated using the ZMNL method are compared. FDS computed using the normal distribution signal of kurtosis 3 will show a big difference over the 100Hz with FDS computed using the signal of kurtosis 6. This paper shows through such FDS comparison that a difference in fatigue life prediction may result in if a vibration profile which does not consider kurtosis occurring in the operating environment of a product is used in a vibration test.
목차
Abstract 1. 서론 2. 주파수 영역에서의 피로 수명평가 3. 첨도가 피로 수명에 미치는 영향 4. 결론 References
키워드
Fatigue Life(피로 수명)Fatigue Damage Spectrum(FDS 피로손상스펙트럼)Kurtosis(첨도)PowerSpectral Density(PSD 파워 스펙트럼 밀도)Probabilistic Density(확률밀도)
저자
홍창섭 [ C. S. Hong | Member, Chonbuk National University ]
Corresponding Author
오재윤 [ C. Y. Oh | Samsung Electro-Mechanics Co., Ltd. ]