基于数字工业摄像的非接触式纯弯曲梁正应力测量  

Normal Stress Measurement of Non-contact Pure Bending Beam Based on Digital Industrial Photography Technology

作　　者：刘洋[1] 钱仁军 张卫峰 资新运 何健[2] 

机构地区：[1]军事交通学院基础部,天津300161 [2]军事交通学院研究生管理大队,天津300161 [3]军事交通学院军用车辆系,天津300161

出　　处：《军事交通学院学报》2016年第5期90-95,共6页Journal of Military Transportation University

基　　金：国家高技术研究发展计划项目(2013AA065303);国家自然科学基金重点项目(91120306)

摘　　要：提出一种基于数字工业摄像的纯弯曲梁正应力测量方法,通过CCD工业相机采集弯曲梁应变前后表面的图像信号,对应变前后的图像进行二维相关计算和基于梯度法的亚像素位移计算,得到弯曲梁表面的应变位移量,进而计算出弯曲梁正应力。搭建了数字工业摄像实验系统,设计了与电阻应变片法测正应力的对比实验,并对结果进行了误差分析。结果表明:数字工业摄像的正应力测量精度在5%以内,能够适用于弯曲梁表面微小应变的位移测量。A new method for measuring normal stress of pure bending beam is proposed. The image signal is obtained by CCD industrial camera,and then the strain displacement is calculated on the surface of the curved beam,and the normal stress of bending beam is calculated. The experimental system of digital industrial camera is set up,and the comparison experiment of the positive stress with the resistance strain gauge method is designed,and the error analysis is carried out. The experiment shows that the accuracy of positive stress measurement in digital industry is less than 5%,which can be applied to the measurement of micro displacement of curved beam.

关 键 词：光学测量 正应力测量 数字工业摄像 数字散斑相关技术 梯度法 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]