【作者】 曹明红； 葛森； 齐丕骞；

【Author】 CAO Ming-hong GE Sen QI Pi-qian (Aircraft Strength Research Institute of China,Xi’an 710065,China)

【机构】 中国飞机强度研究所；

【摘要】 研究了随机振动疲劳寿命估算中窄带过程和宽带过程的不同机理,并通过广泛的数字算例对比研究,以时域计算结果为基准分析了多种频域方法(包括作者提出的一种简化双模态法)的精度,得到这些频域方法的适用范围。另外,对于工程中通常遇到的总均值为零的稳态高斯过程,通过理论分析和时域数字算例对比,证明其单个应力循环均值的综合影响是互相抵消的,可以忽略不计。更多还原

【Abstract】 The theories of several frequency methods to estimate the fatigue life of narrow-band and broad-band random pro- cesses are studied,then the accuracy and application range of every method,involved a simplified Bi-modal method presented by the author,are obtained through extensive digital examples based on time domain method results.The mean value effects to the fatigue life in the Gaussian stationary wide-band random process is proved to be neglectable through analysis and com- parision with time-domain calculation results.更多还原