基于MIDAS/Gen的槽式聚光器结构模态分析

针对槽式聚光器结构优化问题，根据张家港试验基地槽式聚光器实体装置，基于MIDAS/Gen建立槽式聚光器三维有限元模型，采用Lanczos模态计算方法，进行各角度工况下模态分析，得到槽式聚光器在不同工况下的结构模态特征.对槽式聚光器装置进行动力特性测试，测点布置在结构的多个位置，传感器主要布置在聚光镜的镜面中心位置.现场实测过程中选用优泰公司的软件和设备——动态信号采集系统、传感器以及采集仪等试验设备和装置，获取各测点的有效数据，通过优泰软件对原始数据进行处理，得到槽式聚光器装置的动力特性.将数值计算结果与原型实测结果进行对比验证，验证结果表明：本文建立的槽式聚光器三维有限元模型能够较好地模拟现有槽式聚光器结构，能够用于槽式聚光器的静态分析及结构优化分析研究，可以为进一步提高槽式聚光镜组的聚光效果和降低成本提供参考.
For structure optimization of a groove type condenser,a three-dimensional finite element model of the groove type condenser was established based on MIDAS/Gen according to the groove type condenser devices located in Zhangjiagang testing ground. The method of Lanczos modes calculation was used in the model,the modal analysis was conducted under the conditions of different angles,and the structural mode characteristics of the groove type condenser were received under different working conditions. The dynamic characteristics were tested on the devices by arranging the measured points on different parts of the structure and placing sensors at the center of condensers. The dynamic signal acquisition system was used during the field measurement,the testing equipments and devices such as sensors and data acquisition instruments were used to capture the valid data of each measured point. The dynamic characteristics of groove type condenser were then acquired by processing the original data through the acquisition system. For verification of the analysis method,the finite element model was compared with the field measurements. The comparison results show that the three-dimensional finite element model can simulate the existing groove type condenser well,and it can be used in its static analysis and structure optimization analysis. In addition,the finite element modal can provide a scientific reference for further improvement on the concentrated effect of groove type condenser group and cost reduction.