CAJ | 학술논문

工程研究中经常要应用3σ准则来实现随机振动过程的时域、频域转换。文章应用疲劳损伤分析的频域方法，讨论了3σ准则的应用对于振动疲劳损伤累积评价结果的影响。应用满足Rayleigh分布的窄带模型及其4种典型的修正方法分析疲劳影响因子，数值模拟结果表明，3σ截断后的疲劳损伤累积仅占全部疲劳损伤累积的约70%（取m=6），与材料疲劳参数m有关，且基于窄带模型的疲劳影响因子分析方法具有一定程度的通用性。
공정연구중경상요응용3σ준칙래실현수궤진동과정적시역、빈역전환。문장응용피로손상분석적빈역방법，토론료3σ준칙적응용대우진동피로손상루적평개결과적영향。응용만족Rayleigh분포적착대모형급기4충전형적수정방법분석피로영향인자，수치모의결과표명，3σ절단후적피로손상루적부점전부피로손상루적적약70%（취m=6），여재료피로삼수m유관，차기우착대모형적피로영향인자분석방법구유일정정도적통용성。
The 3σclipping rule is used in a random vibration process in the time-domain and the frequency-domain. In this paper, the frequency-domain methods for the fatigue damage accumulation analysis are used to evaluate the effects of the 3σclipping rule on the results of fatigue damage accumulation analyses. A narrow-band model described by the Rayleigh distribution and four typical modified approaches is employed to analyze the fatigue influence factors. Numerical simulations show that the fatigue damage accumulation corresponding to the 3σclipped is only about 70%of the total fatigue damages(with material fatigue parameter m=6). The influence factor analysis based on the narrow-band model can be applied approximately for wide-band random processes.