室温硫化胶层建模在透镜结构分析中的应用

Application of RTV adhesive modeling to structure analysis of reflective mirror

对透射镜结构中室温硫化(RTV)胶层建模方法进行了研究。给出了节点相连(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模型的方法,分别采用3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。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%。分析与测试结果表明,胶层材料在有限元分析当中是不可以被忽略的;综合分析显示,各向同性材料一层单元的建模方法减少了模型单元数量,且达到了工程应用的精度要求。

The modeling methods for Room Temperature Vulcanization（RTV）adhesive in a reflective mirror structure were investigated.The modelling methods of node-connection（ignoring RTV adhesive））,isotropy（three elements and one element）and anisotropy materials were introduced,respectively.The Finite Element Analysis（FEA）models of lens sets were established by three methods and the simulated mode was analyzed.Furthermore,the mode test equipment was setup and the mode parameters were tested for lens sets.The results show that the error of the first-order free mode frequency between the modeling method of anisotropy and the test method is only 0.3%,and the errors obtained from the three modeling methods of the isotropy of three elements,isotropy of one element and node connecting by are 1.8%,1.2% and 13.9%,respectively.From the anlysis and test,it is concluded that the RTV adhesive can not be ignored in FEA and the modeling method of isotropy of one element is a best choice to reduce number of models and to satisfy engineering requirements.