大型飞机机载设备隔振空气弹簧垂向刚度研究

Research on analysis of vertical rigidity of large airplane's airborne air spring

大型飞机的机载关键设备需要隔振系统进行振动保护,而空气弹簧在隔振性能上具有比金属弹簧更好的非线性和低频性能,对应用在大型飞机机载设备隔振系统上的空气弹簧的材料非线性、接触条件非线性等进行了分析,在对空气弹簧非线性与气体单元的实现方法进行分析的基础上,利用非线性有限元软件MSC.Marc对约束膜式空气弹簧的垂向刚度进行了数值仿真。结果表明:空气弹簧垂向刚度呈现非线性特征;空气弹簧垂向刚度与垂向位移的关系密切;随着初始内压和胶膜帘线密度的增大,空气弹簧的垂向刚度增加;胶膜帘线角与垂向刚度的关系受到约束的影响。

For some key airborne devices should be protected by vibration isolation system,it ana-lyzes material and contact nonlinear of air spring,applied to vibration isolation system of some large-scale airborne devices.Its nonlinear and low frequency performance are superior to those of metal spring.Based on research on implementation method of its nonlinear and gas unit,it utilizes nonlinear finite-element software,MSC.Marc,to carry on numerical simulation about vertical stiffness of constraint film type.The results show that air spring’s vertical stiffness presents nonlinear closely related to vertical displacement.In addition,vertical stiffness increases with initial internal pressure and adhesive film cord’s density,and the relation-ship between adhesive film cord’s angle and vertical stiffness is affected by constraint.