A Dynamic Measurement Error Compensation Method Based on Wire-Drawn Encoder Measurement System

Abstract

The invention provides a dynamic measurement error compensation method based on a pull rope encoder measuring system. The method comprises the following steps that a relation database of pull rope deformation and stress is built; a relation database of pull rope acceleration speed and stress is built; the actual displacement of the tail end of the pull rope is obtained through calculation according to the relation database of the pull rope deformation and stress and the relation database of the pull rope acceleration speed and stress. According to the dynamic measurement error compensation method, a force measurement sensor does not need to be independently added in an original measuring system, the pull rope deformation caused by the acceleration speed of a measured object can be compensated in the dynamic measurement process, dynamic measurement precision is improved, the calculation process is simple, and implementation is easy.

Description

technical field [0001] The invention relates to the field of dynamic measurement, in particular to a dynamic measurement error compensation method based on a cable-drawing encoder measurement system. Background technique [0002] The three-coordinate measuring instrument is a common large-scale three-dimensional measurement system for space measurement, which can measure the surface characteristic parameters of the workpiece with high precision, but the disadvantages of this system are that it is too bulky, expensive, and inconvenient to move. The other is the commonly used laser tracker, which has high measurement accuracy and wide measurement range, but its dynamic measurement speed is limited and the price is too expensive. The dynamic measurement technology based on the high-precision rope encoder has been researched and applied. However, when measuring the three-dimensional coordinates of space, for the application occasions where the motion acceleration of the measured...

AI Technical Summary

Problems solved by technology

[0002] The three-coordinate measuring instrument is a common large-scale three-dimensional measurement system used for space measurement, which can measure the surface characteristic parameters of the workpiece with high precision, but the disadvantage of this system is that it is too bulky, expensive, and inconvenient to move

The other is the commonly used laser tracker, which has high measurement accuracy and wide measurement range, but its dynamic measurement speed is limited and the price is too expensive

The dynamic measurement technology based on the high-precision rope encoder has been researched and applied. However, when measuring the three-dimensional coordinates of space, for the application occasions where the motion acceleration of the measured object is large, the rope will be deformed due to the impact force of the acceleration. Thereby reducing the measurement accuracy of dynamic measurement of three-dimensional coordinates

However, it is difficult to directly measure the relationship between the acceleration and the deformation of the cable

Images