| 邓华夏*,陈帅,王君,张进,马孟超,钟祥.利用有限测点的振动位移预测全局应变的研究[J].实验力学,2018,33(5):685~695 |
| 利用有限测点的振动位移预测全局应变的研究 |
| On the prediction of full-field strain by using vibration displacement of limited measurement points |
| 投稿时间：2018-03-01 修订日期：2018-04-09 |
| DOI：10.7520/1001-4888-18-038 |
| 中文关键词: 双目视觉 全局预测 应变模态 模态扩展 |
| 英文关键词:binocular stereo vision full-field prediction strain modal modal expansion |
| 基金项目:国家自然科学基金(51575156, 51675156, 51775164, 51705122)，中央高校基本科研基金(JZ2017HGPA0165, PA2017GDQT0024) |
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| 中文摘要: |
| 在结构的健康监测中，应变和位移是较为常用的监测对象。传统的位移和应变获取主要采用接触式测量，如粘贴加速度传感器或应变片，虽然这种方法应用广泛但是对于轻质或旋转结构较为困难。非接触测量由于没有附加质量故可以获得较为精确的振动位移，但如何利用位移获取全局应变的研究还相对缺少。本文主要采用双目立体视觉技术获取结构上有限测点的振动位移，通过模态扩展理论将有限测点的位移扩展为全局位移，并根据应变模态与材料力学中应变和位移的关系预测结构的全局应变。在不同的激励情况下，将本文方法的预测结果与应变片测量结果对比，结果表明本文方法具有一定可行性，能够进行全场的非接触式应变测试。 |
| 英文摘要: |
| In structural health monitoring, strain and displacement are the common monitoring objects. Traditional method of obtaining displacement and strain is mainly contact-type measurement, such as pasting acceleration sensor or strain gauge. This method is widely used, but it is difficult for light weight or rotating structures. Non-contact measurement can obtain more accurate vibration displacement due to without additional mass. But how to use local displacement data to obtain global strain is relatively scarce. In this paper, the vibration displacement data of finite measurement points are obtained by binocular stereo vision technology, and the displacement of finite measured points is extended to global displacement information by modal expansion theory. Under different excitation conditions, the prediction results of this method are compared with the results of strain gauge measurement. Results show that the proposed method is feasible and can be used for full-field non-contact strain measurement. |
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