A measurement and calculation method for axial bending and torsion deformation of prismatic pipes
A calculation method and technology of bending and torsion deformation, applied in the field of detection, can solve the problems of not considering the overall situation of the section, the measurement and calculation of axial bending degree is not accurate enough, and the calculation parameters are insufficient, so as to accurately reflect the torsional deformation and improve the measurement and calculation method Effect
Inactive Publication Date: 2019-05-24
SICHUAN UNIV
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Problems solved by technology
[0003] In the existing measurement and calculation methods, the measurement and calculation parameters of the axial bending and torsion deformation of the pipeline are not perfect, and cannot accurately reflect the actual deformation of the pipeline.
For the measurement and calculation of axial curvature, the calculation parameters are established using the relationship between the adjacent detection points of each section, without considering the overall situation of the section, the calculation parameters are insufficient, and the measurement and calculation of axial curvature is not accurate enough; for the measurement and calculation of axial torsion , there is no more targeted measurement and calculation method
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[0029] The present invention will be further described below in conjunction with the accompanying drawings.
[0030] like figure 1 As shown, each detection section F of the hexagonal prismatic pipe i Schematic diagram, the coordinates of the measuring points of each section are obtained through detection Where j is the serial number of each section, and i is the serial number of the measuring point on the section.
[0031] like figure 2 Shown is the centroid of each section The minimum enveloping cylindrical surface of each centroid is used as the least square midline of each centroid, and the cylindrical surface with the axis parallel to the least square midline contains each centroid point, and the minimum contained diameter is obtained as the first calculation parameter of the axial curvature of the pipeline The maximum value d_max from each centroid point to the least square midline can be approximated as follows:
[0032]
[0033] The centroid of each section ...
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The invention discloses a prismatic pipeline axial bending-torsional deformation measuring and evaluating method. The evaluating method includes three flexibility evaluating indexes and two torsion degree evaluating indexes. The evaluating method comprises the steps of detecting and obtaining the coordinate measured value of each measuring point at the outer contour of each cross section along thepipeline; calculating a first evaluating index of the axial flexibility of the pipeline by means of the center of mass of each cross section; calculating a second evaluating index and a third evaluating index of the axial flexibility of the pipeline by means of the reference plane projective points of the center of mass of each cross section; calculating a first evaluating index and a second evaluating index of the axial torsion degree of the pipeline by means of the reference plane projective of the equation of each cross section edge and a summit coordinate. The invention is advantageous inthat a plurality of prismatic pipeline axial flexibility evaluating indexes are established through the center of mass of each cross section of the detection pipeline, and a plurality of prismatic pipeline axial torsion degree evaluating indexes are established through the reference plane projection of a cross section fitting calculating edge and the summit; all test point information of each cross section can be fully utilized, and a plurality of indexes can reflect the bending-torsional deformation state of the pipeline in a more comprehensive manner, and the accuracy of measuring and evaluating the prismatic pipeline axial bending-torsional deformation can be improved.
Description
technical field [0001] The invention belongs to the technical field of detection, in particular to a method for measuring and calculating the axial bending and torsion deformation of a prismatic pipeline. Background technique [0002] Prismatic pipes and related tubular parts are widely used in industrial production. In complex working conditions, the pipes will be deformed due to factors such as high temperature, high pressure, and mechanical extrusion, resulting in loss of working ability. Therefore, it is necessary to carry out accurate detection and calculation judgment on pipes and tubular parts. The coordinate values of each detection point on the outer contour of the pipeline are obtained through sensor detection, and the coordinate values of each detection point are processed by a certain measurement and calculation method to obtain various calculation parameters reflecting the axial bending and torsion deformation of the pipeline. [0003] In the existing measu...
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IPC IPC(8): G01B11/16
Inventor 陈珂蒋伟
Owner SICHUAN UNIV