Multi-view visual measurement of three-dimensional dynamic position and orientation of aero engine casing
In view of the difficulty of measuring the relative position and orientation in the rigidity test of aero engine casing,the conventional method of binocular visual measurement for position and orientation was improved,a global multi-view visual dynamic position and orientation measurement method based on video dynamic measurement technology was proposed.The global coordinates of coded point on the casing under initial coordinate system were obtained by close-range photogrammetry and converted to custom numerical model coordinate system of the casing by vector coordinate transformation.The external parameters of multi-view camera were solved by using the coded point coordinates under numerical model coordinate system,and the coordinate system of each measuring camera was unified,so that the measuring data can be analyzed in the customized coordinate vector.The three-dimensional coordinates of measuring points on the inner and outer rings of the casing under each deformation state were obtained by multi-view visual dynamic position and orientation measurement method,and then the position and orientation of the measuring points on the inner and outer rings of the casing in the numerical model coordinate system as well as their relative changes were calculated.The test results showed that the displacement measurement error of the proposed method was less than 0.005 mm compared with the traditional micrometer measurement method,which made up for the disadvantage of the traditional measurement method in extracting difficultly the relative orientation of different parts of the test piece,thus providing a convenient measurement method and reliable data source for the rigidity test of aero engine casing and related shells.
visual measurementaero engine casingphotogrammetrycoordinate transformationrelative position and orientation
万方数据
维普
