FIELD: physics, measurement technology.
SUBSTANCE: invention relates to measurement technology and specifically to methods of measuring geometrical parameters of long components. The method comprises installing a long component horizontally on two supports from the ends of the component or in cantilever manner, providing fixture of the component during measurement, measuring, in a single coordinate system, the polar diagrams of the sections of the surface of the component in transverse planes lying along the longitudinal coordinate axis and perpendicular thereto. Coordinates of the centres of the sections are determined from the obtained polar diagrams. After first measurement of the polar diagrams of the sections in all given transverse planes along the longitudinal coordinate axis, the method comprises turning the component by an angle equal to 360/n, then re-measuring the polar diagrams of sections in the same transverse planes. Respective turns of the component and measurement of the polar diagrams in cross-sections are performed n times, wherein the number of positions n is an integer not less than three and a multiple of the order of axial symmetry of the profile of the component. Further, a radius vector is constructed from the longitudinal axis to the centres of sections, and coordinates of the point of the axis of the component in each transverse plane are the coordinates of the end of the sum radius vector, determined by summation in each transverse plane of n radius vectors to the centres of the sections, pre-turned about the longitudinal coordinate axis by an angle corresponding to the turning angle of the component, where they were obtained. Nonlinearity of the component is determined from the obtained values of coordinates of points of the axis of the component in each transverse plane.
EFFECT: invention is characterised by enabling measurement of nonlinearity of the axis of long non-rigid components with a curved axially symmetrical profile of the cross-section, lying in a horizontal position.
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