Spatial-Domain Techniques for Finite Element Model Updating Via Laser-Based Experimental Modal Analysis

这项美国-巴西合作科学奖将支持弗吉尼亚理工学院和州立大学的拉里·米切尔和巴西坎皮纳斯大学的j·罗伯托·f·阿鲁达的合作。该项目旨在研究使用空间密集的实验响应数据来更新描述相同结构的有限元（FE）模型。研究人员将使用一种独特的扫描激光多普勒测速仪（LDV）来测量结构上超过65,000个点的响应图像，以便开发LDV数据缩减和模态参数提取的空间域技术。这些方法将用于更新有限元模型，使其预测更接近于测量数据。这项工作将首次允许空间上详细的实验数据来帮助定义有限元模型中的缺陷，并为用于提取基于实验的模态参数的空间密集型数据提供基础。美国方面在模态测试场景中拥有激光设备和实验测量专业知识。巴西团队具有将有限元方法应用于动力结构建模和试验模态测试的能力。* * * / /

This U.S.-Brazil Cooperative Science award will support the collaboration of Larry Mitchell of Virginia Polytechnic Institute and State University and J. Roberto F. Arruda of the Universidade Estadual de Campinas in Brazil. The project aims to investigate the use of spatially dense experimental response data to update the finite element (FE) model describing that same structure. The researchers will use a unique scanning Laser Doppler Velocimeter (LDV) to measure a response image at up to over 65,000 points on the structure, in order to develop spatial- domain techniques for LDV data reduction and modal parameter extraction. These methods will be used to update the FE model so that its predictions more closely match the measured data. This work will, for the first time, allow spatially detailed experimental data to help define defects in the FE models and provide a basis for spatial-intensive data to be used to extract experimentally based modal parameters. The U.S. side has a laser facility and experimental measurement expertise in a modal test scenario. The Brazil group has capabilities in applying FE methods to dynamic structural modeling and experimental modal testing experience. ***//