CAJ | 학술논문

首先,为了克服二参数幂函数只适于表示中等寿命区S-N图线段的局限,文中采用三参数幂函数及两个二参数幂函数两种方法表示S-N曲线中、高周寿命段.然后,基于随机过程、Miner线性累积损伤理论及构件P-S-N曲线,分别导出窄带和宽带情况下适用于高周疲劳且具有一定可靠度的疲劳寿命计算公式.最后,对一随机加速度功率谱作用下的机载杆天线进行疲劳寿命估算.
수선,위료극복이삼수멱함수지괄우표시중등수명구S-N도선단적국한,문중채용삼삼수멱함수급량개이삼수멱함수량충방법표시S-N곡선중、고주수명단.연후,기우수궤과정、Miner선성루적손상이론급구건P-S-N곡선,분별도출착대화관대정황하괄용우고주피로차구유일정가고도적피로수명계산공식.최후,대일수궤가속도공솔보작용하적궤재간천선진행피로수명고산.
In order to overcome the limitation that a power function with two parameters can only express middle cycle range of S-N curve, a power function with three parameters and two power functions with two parameters are utilized individually to express middle and high cycle ranges of S-N curve. Further based on random process, Miner's linear damage cumulative theory and P-S-N curve of components, the formulas are derived to evaluate fatigue life of high cycles with a certain probability for both narrowband and broadband cases. Finally the fatigue life of an antenna on a helicopter is calculated considering a random power spectrum of acceleration.