| 二维数字图像相关方法的拉伸实验误差分析 |
| |
| 引用本文： | 王楠,李恩普,汤忠斌,李发东.二维数字图像相关方法的拉伸实验误差分析[J].光学仪器,2012,34(3):5-12. |
| |
| 作者姓名： | 王楠 李恩普 汤忠斌 李发东 |
| |
| 作者单位： | 1. 西北工业大学理学院陕西省光信息技术重点实验室,陕西西安,710129
2. 西北工业大学航空学院,陕西西安,710072 |
| |
| 基金项目： | 国家自然科学基金资助项目，西北工业大学基础研究基金资助项目，111计划资助项目 |
| |
| 摘 要： | 对数字图像相关(DIC)方法的拉伸实验误差进行了系统分析。通过刚体运动实验,从软件模拟计算和硬件两方面研究了DIC方法的实验误差,同时,根据成像原理,分析了离面位移对实验结果的影响。为了检验测试系统的测量精度,将DIC方法与多晶铜试样拉伸实验相结合,比较了不同实验条件下DIC方法与应变片测量的结果,分析认为测量误差主要来源于摄像机噪声及离面位移。鉴于这两种误差难以消除,探索了一种误差修正方法,对系统误差进行修正并得到满意结果。
|
| 关 键 词： | 数字图像相关(DIC) 误差分析 刚体运动 离面位移 |
| 收稿时间： | 2011/11/15 |
An investigation of the experimental error of 2-D DIC method applied to tensile strain measurement |
| |
| WANG Nan
,
LI Enpu
,
TANG Zhongbin
,
LI Fadong.An investigation of the experimental error of 2-D DIC method applied to tensile strain measurement[J].Optical Instruments,2012,34(3):5-12. |
| |
| Authors: | WANG Nan LI Enpu TANG Zhongbin LI Fadong |
| |
| Affiliation: | 1.Shaanxi Key Laboratory of Optical Information Technology,School of Science,Northwestern Polytechnical University, Xi′an 710129,China;2.School of Aeronautics,Northwestern Polytechnical University,Xi′an 710072,China) |
| |
| Abstract: | The errors of digital image correlation(DIC) method were systematically analyzed.Based on rigid-body motion,both the numerical and experimental errors related to DIC were investigated,and the influence of out-of-plane displacement was analyzed theoretically.In order to verify the accuracy of the home-developed DIC technique,the DIC method was compared with the strain gauge by measuring the same strain on a large copper specimen under tension.The result of the analysis indicates that the errors were originated from the noise of digital camera and the out-of-plane displacement of the whole measurement system.The system error was then calibrated and a better result was obtained. |
| |
| Keywords: | digital image correlation(DIC) error analysis rigid-body motion out-of-plane displacement |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
