座椅固定连接装置的动态失效分析

Dynamic Failure Analysis for Attachments of Flight Passenger Seats

首先使用有限元软件MSC.Nastran对某型客机两联座椅所用的固定连接装置进行了静强度分析,获得了作用在座椅固定连接装置上的极限失效载荷,并将这些极限失效载荷作为座椅固定连接装置的连接失效判据。按照运输类飞机适航标准CCAR-25-R3所规定的两种座椅动态冲击试验条件,借助瞬态动力学分析有限元软件MSC.Dytran对两联座椅的冲击动力学试验进行了数值仿真。通过对座椅冲击动力学试验仿真,获得了座椅地轨螺栓与地板固定连接处所受到的冲击力随时间的变化情况。分析座椅固定连接处所受到的冲击载荷时间历程曲线,得到在惯性冲击载荷作用过程中,座椅与地板连接失效发生的位置和时刻。同时由座椅冲击动力学仿真所获得的座椅固定连接装置所受到的最大冲击载荷也可以为客机地板的结构强度设计提供参考。

The dynamic failure analysis for attachments connecting flight passenger seat and floor subject to impact loads due to force-landing is performed.Static strength of classical attachments used by the double-seat of a type of passenger seat is calculated using finite element method;the limit loads acting on the attachments are obtained and used as the failure criterion for attachments.According to the statements of impact testing for passenger seat in CCAR-25-R3,the impact of the double-seat is numerically tested.The time histories of reaction forces on seat leg bolts connected to the floor are obtained.By comparing to the failure criterion,the position and time of attachments failure can be determined.The peak value of reaction forces of attachments achieved by the finite element simulations can also be a useful reference in strength design for the passenger floor.