This paper studies the effect of a playtykurtic excitation signal on fatigue life. In general, a vibration test uses an excitation signal having a normal distribution of kurtosis 3. However, a vibration signal generated in a product’s operation environment has usually a non-normal distribution. This paper uses ZMNL method to generate a playtykurtic excitation signal having the equivalent power spectrum density with a reference vibration profile. This paper proposes a method which uses a fatigue damage spectrum ratio for studying the effect of a playtykurtic excitation signal on fatigue life. The fatigue spectrum damage ratio is obtained by dividing a fatigue damage spectrum acquired using the acceleration profile in which all conditions are the same except for the kurtosis by a fatigue damage spectrum acquired theoretically. This paper shows that the signal of kurtosis less than 3 can increase the fatigue damage spectrum by more than 2 to 4 times compared to the signal of kurtosis 3 using the fatigue damage spectrum ratio.
목차
ABSTRACT 1. 서론 2. 피로손상도 해석 3. 저첨도에 의한 피로수명의 영향 4. 결론 References
키워드
Fatigue Life(피로수명)Fatigue Damage Spectrum(FDS 피로손상 스펙트럼)Kurtosis(첨도)PowerSpectral Density(PSD 파워 스펙트럼 밀도)Probabilistic Density(확률밀도)Platykurtic excitation signal(저첨도 가진 신호)
저자
홍창섭 [ C. S. Hong | Comet Network Co., Ltd. ]
이학 [ H. Yi | School of Mechanical Engineering, Kyungpook National University ]
오재윤 [ C. Y. Oh | Member, Chonbuk National University ]
Corresponding Author