Bush有限单元原理及其在航天器结构建模中的应用

利用大量的数值计算确定了MSC.NASTRAN软件中广义弹簧单元（Bush）刚度阵的解析表达式,通过对比Bush元与剪切梁元的刚度阵,推导了Bush元参数与剪切梁刚度参数的对应关系,并利用展开状态的太阳翼结构和大型桁架结构的静力和动力分析验证了推导结果。该研究揭示了Bush有限单元的原理和所有输入参数的物理含义,有助于Bush元在结构有限元分析中的准确使用。

Bush Finite Element Principle and Its Application in Building Structural Models for Spacecraft

In this paper,the analytical formulation of the stiffness matrix for Bush element in NASTRAN is derived by plenty of numerical computations.By comparing the stiffness matrix of Bush element with that of Timoshenko beam element,the author finds that they can be completely equivalent if their input parameters are properly defined and that the input parameters for Bush element can be expressed by the stiffness parameters for Timoshenko beam.The derivations are verified by two application examples in spacecraft...