Engineering Research Equipment Grant: Structural Laser Velocimeter

该项目为采购设备提供资源，以支持结构动力学研究。该设备包括单个激光迈克尔逊干涉测速仪及其相关的控制/显示计算机和用于结构测量的软件。该系统可以为实验结构动力学建模领域的独特创新技术进步奠定基础。激光测量的非接触式特性消除了在实验结构分析中通常使用的加速度计遇到的许多响应数据污染的问题。旋转效应不能用平移传感器测量，也可以用激光测速仪测量。该设备支持当前的两项主要研究活动。第一种是高密度振型提取和空间模态分析，重点是对超过65,000个点的3个自由度的结构的实或复振型进行实验提取。第二个活动涉及对现有建模方法的评估和用于预测结构动态行为的新弹性理论的发展。此外，该速度计还将用于有限元模型和试验模态分析振型的六维比较，以确定有限建模缺陷，通过详细的振型比较进行定量的无损结构损伤评估，以及根据测量的多模六自由度试验振型建立数学模型。

This project provides resources for the procurement of equipment to support structural dynamics research. The equipment comprises a single laser Michelson interferometric velocimeter with its associated control/display computers and software for structural measurements. This system could establish the basis of a unique and innovative technological advancement in experimental structural dynamics modeling. The noncontacting characteristic of laser measurements eliminates many of the problems of contaminated response data encountered with accelerometers normally used in experimental structural analysis. Rotational effects, which cannot be measured with translational transducers, can also be determined with the laser velocimeter. The equipment supports two major current research activities. The first, high density mode shape extraction and spatial modal analysis, focuses on the experimental extraction of real or complex modes of a structure at more than 65,000 points with 3 degrees of freedom. The second activity addresses the assessment of existing modeling approaches and development of new elasticity theories for predicting dynamic behavior of structures. Furthermore, this velocimeter will be used for a six dimensional comparison of finite element models and experimental modal analysis mode shapes for the determination of finite modeling defects, for quantitative non-destructive structural damage evaluation via detailed mode shape comparison, and for the development of mathematical models from measured multi- mode six degree of freedom experimental mode shapes.