Experimental Modal Analysis and Operational Deflection Shape Analysis of a Cantilever Plate in a Wind Tunnel with Finite Element Model Verification
Experimental Modal Analysis and Operational Deflection Shape Analysis of a Cantilever Plate in a Wind Tunnel with Finite Element Model Verification
复制标题
DOI：
10.1007/s40799-023-00682-w
复制
发表时间：
2023-11
影响因子：
1.6
通讯作者：
D. T. Will;W. D. Zhu
中科院分区：
文献类型：
--
作者：
D. T. Will;W. D. Zhu
本文探讨了在风洞中，悬臂板与圆柱体的碰撞激励下的响应。详细的计算机辅助设计（CAD）模型和有限元分析（FEA）模态模拟的实验装置进行了介绍。两个实验技术进行了深入的讨论：基于加速度计的实验模态分析（EMA）方法，和非接触，全场，高速数字图像相关（DIC）为基础的操作偏转形状（ODS）分析方法。的悬臂板的前七个固有频率，模态振型和ODS的实验和有限元分析结果，并进行比较。EMA和FEA固有频率结果之间的百分比差异小于4.8%，EMA和FEA模态形状之间的模态保证标准（MAC）值至少为0.845。ODS分析和FEA固有频率结果之间的百分比差异小于3.4%，而ODS分析ODS和FEA振型之间的MAC值至少为0.728。EMA和ODS分析固有频率结果之间的百分比差异小于3.5%，EMA振型和ODS分析ODS之间的MAC值至少为0.505。存在两组具有相对高相关性的两种不同的振型和ODS。一组是一组两个间隔很近的模式和臭氧消耗物质，间隔约20赫兹，形状明显相似。另一组是一组两种模式和ODS，它们相距约100 Hz，形状相似性不太明显。
This work explores the response of a cantilever plate attached to a cylinder in a wind tunnel under an impact excitation. A detailed computer-aided design (CAD) model and the finite element analysis (FEA) modal simulation of the experimental setup are introduced. Two experimental techniques are thoroughly discussed: an accelerometer-based experimental modal analysis (EMA) method, and a non-contact, full-field, high-speed digital image correlation (DIC)-based operational deflection shape (ODS) analysis method. The experimental and FEA results of the first seven natural frequencies, mode shapes, and ODSs of the cantilever plate are presented and compared. The percent differences between the EMA and FEA natural frequency results are less than 4.8%, and the modal assurance criterion (MAC) values between the EMA and FEA mode shapes are at least 0.845. The percent differences between the ODS analysis and FEA natural frequency results are less than 3.4%, while the MAC values between the ODS analysis ODSs and FEA mode shapes are at least 0.728. The percent differences between the EMA and ODS analysis natural frequency results are less than 3.5%, and the MAC values between the EMA mode shapes and ODS analysis ODSs are at least 0.505. There are two sets of two different mode shapes and ODSs with relatively high correlation. One set is a set of two closely spaced modes and ODSs approximately 20 Hz apart with obvious similarities in shape. The other set is a set of two modes and ODSs approximately 100 Hz apart that share less obvious similarities in shape.