单轴向与多轴向随机载荷下星载单机的疲劳损伤研究  

Fatigue Damage Study on Satellite Single Machine under Uniaxial and Multi-axial Random Loads

作　　者：张雨 董好志[1] 任海林 ZHANG Yu;DONG Haozhi;REN Hailin(The 38th Research Institute of CETC,Hefei 230088,China)

机构地区：[1]中国电子科技集团第三十八研究所,安徽合肥230088

出　　处：《机械制造与自动化》2023年第2期68-71,共4页Machine Building & Automation

摘　　要：基于随机振动频域理论,采用“3σ法则”和等效应力-应变的疲劳分析方法,对比研究单轴、多轴载荷下某星载单机的疲劳损伤,评估两种试验方案的等效性。结果表明:该单机对z向激励敏感,z向随机载荷造成的疲劳损伤远大于x、y向载荷;多轴向随机载荷作用下单机的最大等效应力、疲劳损伤累积均大于单轴向随机载荷作用;3个正交轴下的单轴依次振动替代多轴随机振动试验的等效方案为欠试验方案,需要从定量角度优化试验方案。Based on frequency domain theory of random vibration,fatigue damages of a satellite single machine under uniaxial and multi-axial loads were compared and studied by 3σprinciple and fatigue analysis method of equivalent stress-strain,and the equivalence of these two test schemes was assessed.The results show that the satellite single machine is sensitive to z—direction excitation,and the fatigue damage of the single machine caused by z direction random load is much larger than that caused by x and y direction loads;the maximum equivalent stress and fatigue damage accumulation of the single machine under multi-axial random load are higher than that of uniaxial random load,the equivalent scheme of uniaxial sequential vibration under three orthogonal axes replacing multi-axis random vibration experiment is insufficient,which requires optimization of experimental scheme from quantitative perspective.

关 键 词：星载单机 随机振动 单、多轴向载荷 疲劳损伤累积 

分 类 号：TB534.3[理学—物理]