Large-scale high-speed rotary equipment cylinder contour measurement model based on multi-offset errors

Abstract

The invention discloses a large-scale high-speed rotary equipment cylinder contour measurement model based on multi-offset errors. The measurement model comprises seven bias error components, respectively including an eccentric error (alpha, e), a geometrical axis tilt error gamma, a sensor measuring head offset error dj( j = 1, 2, ..., p, p is the number of sampling sections), a sensor measuringball radius r, a sensor measuring head strut inclination error horizontal guide rail axis inclination error w, and a vertical guide rail axis inclination error phi, and measurement models at differentheight sections of a cylindrical contour. Error sources can generate great influence in cylindrical contour measurement, so that an existing model cannot meet the current precision requirement for cylindrical contour precision measurement of large-scale high-speed rotary equipment.

Description

technical field

[0001] The invention belongs to the technical field of surface shape measurement; in particular, it relates to a cylindrical profile measurement model for large-scale high-speed rotary equipment based on multiple offset errors. Background technique

[0002] Cylindricity error is the core technical index reflecting the surface shape of rotary parts. With the development of precision engineering technology and aerospace technology, the accuracy requirements for the cylindricity error of rotary parts are getting higher and higher. For example, the cylindricity error of a certain type of aeroengine low-pressure turbine shaft is required to be within 5 μm; accuracy, but the absolute existence of each system error has a great impact on the measurement of the surface shape of rotary parts. Therefore, it is necessary to study the possible bias error sources in the measurement system of large-scale high-speed rotary equipment, and further improve the accuracy of rotar...

Images