RTV胶层有限元建模方法在透射镜结构动力学分析中的应用

对透射镜结构中RTV胶层建模方法进行了研究。详细地阐述了节点相连(忽略胶层材料)、各向同性材料(三层体单元和一层体单元)和各向异性材料建立胶层材料的方法，分别采用三种方法对透射镜镜组建立了有限元模型，并进行了仿真模态分析，同时搭建了模态试验装置，测试了它的模态参数，结果表明，各向异性胶层材料的建模方法得到的一阶自由模态频率与试验测试的一阶自由模态频率误差只有0.3%，而各向同性材料的三层单元和一层单元建模方法、节点相连建模方法的误差分别达到1.8%，1.2%和13.9%。通过分析与测试可以得到，胶层材料在有限元分析当中是不可以被忽略的，综合来看，各向同性材料一层单元的建模方法不但可以减少模型单元数量，同时还可以达到工程应用的精度要求

Application of modeling methods of RTV adhesive in reflective mirror structure dynamical analysis

Making research on modeling methods for RTV adhesive in reflective mirror structure. The methods of node-connection(ignoring RTV adhesive)）,isotropy（three elements and one element） and anisotropy materials are detailed introduced respectively. The FEA model of lens sets was created and the mode analysis was made. At same time, the mode test equipment was setup and the mode parameters were tested for lens sets. The results show that error between the first free mode frequency got from the modeling method of anisotropy and the first free mode frequency got from test was only 0.3%, and the errors of the method of isotropy three elements and one element and node connecting are 1.8％, 1.2％ and 13.9%. From analysis and test, we can conclude that the RTV adhesive can not be ignored in FEA, The method of isotropy for one element can not only reduce the quantity of model number, but satisfy engineering requirement