| 王洁,郭昱,张小虎*,刘进博,丁少闻.基于单目位姿估计的拉力扭转形变测量方法研究[J].实验力学,2017,32(6):725~732 |
| 基于单目位姿估计的拉力扭转形变测量方法研究 |
| On the Measurement Method of Tensile Torsion Deformation Based on Monocular Pose Estimation |
| 投稿时间：2017-02-18 修订日期：2017-05-19 |
| DOI：10.7520/1001-4888-17-026 |
| 中文关键词: 扭转形变测量 单目位姿估计 Rodrigues 非接触 |
| 英文关键词:Torsional deformation measurement monocular pose determination Rodrigues non-contact |
| 基金项目:国家自然基金(Grant No.11472302) |
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| 中文摘要: |
| 拉力作用下的高精度扭转形变测量是材料力学性能测试的难点。针对轴形试验件在拉力作用下的扭转形变测量问题，提出了一种基于单目位姿估计的非接触式测量方法。在试验件的一端延伸连接一个轻质平面标志板，利用固定于地面的测量相机对平面标志板实时成像，并根据单目位姿估计原理解算试验件变形前后平面标志板的相对姿态变化。若试验件只发生扭转变形，则平面标志板的姿态变化可由绕试验件轴向的旋转角描述，通过对平面标志板的姿态变化矩阵进行Rodrigues分解，可得到试验件轴向在空间中的向量表示及绕轴向的旋转角大小，该旋转角即为试验件的扭转变形角。搭建了实验平台，开展了实际拉力扭转形变测量实验，结果表明: 基于单目位姿估计的非接触式轴形试验件扭转形变测量方法精度高，系统结构简单，是拉力扭转形变测量的一种有效测量方法。 |
| 英文摘要: |
| High precision torsion deformation measurement under tensile action is a difficult point in materials mechanical properties measurement. In order to solve the problem of torsion deformation measurement of axial specimen under tensile action, a non-contact measurement method based on monocular pose estimation is presented. A lightweighted flat mark plate is connected at one end of tested specimen, real time imaging of the flat mark plate was realized by using a camera fixed to the ground. According to the principle of monocular pose estimation, the relative posture change of flat mark plate before and after specimen deformation is calculated. If the specimen only produces torsion deformation, the pose change of flat mark plate can be described by the rotation angle around the test piece in axial direction. Through Rodrigues decomposion of flat mark plate pose change matrix, the axial representation of specimen in space and the rotation angle around the axis can be obtained, which is the torsion deformation angle of specimen. An experimental platform was built to carry out the actual tensile torsion deformation experiment. Experimental results indicate that this non-contact torsion deformation measurement method based on monocular pose estimation has high accuracy and simple system composition, is an effective measurement method for torsion deformation measurement under tensile action. |
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