论文部分内容阅读
飞行器在飞行过程中所受到的脉动压力是典型的随机激励,文章将某飞行器简化为一维梁结构,借助于附体湍流边界层造成的脉动压力环境经验公式,建立飞行器梁结构的脉动噪声环境数学模型,对飞行器梁结构在载荷在完全相关、部分相关和完全独立三种相关性下的随机响应进行研究,采用MSC.Patran/Nastran大型有限元分析软件对该梁结构进行仿真分析,将有限元分析结果于理论解进行对比。结果证明,在进行结构响应分析时,载荷间的互相关作用是不能忽略的,对计算精度影响较大,运用有限元仿真解决简单飞行器结构的随机响应问题是比较可靠的。
The pulsating pressure experienced by the aircraft during flight is a typical random excitation. In this paper, an aircraft is simplified as a one-dimensional beam structure. Based on the empirical formula of pulsating pressure environment caused by the turbulent boundary layer, the pulsating noise environment of the aircraft’s beam structure is established Mathematical model of the aircraft beam structure in the load is fully correlated, partially related and completely independent of the three kinds of correlation under the random response to study the use of MSC.Patran / Nastran large finite element analysis software for the beam structure simulation analysis will be limited Meta-analysis results in theoretical solutions for comparison. The results show that the cross-correlation between loads can not be neglected in the structural response analysis, which has a great influence on the calculation accuracy. The finite element simulation is more reliable for solving the random response of simple aircraft structures.