Alignment error measurement method for large high-speed rotary equipment based on closed-loop dynamic measurement

Abstract

The present invention proposes an alignment error measurement method for large-scale high-speed rotary equipment based on closed-loop dynamic measurement. The measurement method includes the following steps: each component is regarded as an ideal rigid body, and three displacement degrees of freedom δ x ,δ y ,δ z and three angular degrees of freedom θ x , θ y , θ z , calculate the geometric deviation of each component; bring the geometric deviation of each component into the error cumulative sum formula, calculate the error accumulation of multiple interconnected components with the help of multi-rigid body system theory and coordinate matrix transformation, and obtain the total The error E total ; combined with the calculated total error E total Compensate the installation attitude error of the sensor. The method for measuring the alignment error of large-scale high-speed rotary equipment based on closed-loop dynamic measurement of the present invention can calculate the alignment error value of the terminal, and then compensate the error through a software algorithm to improve the measurement accuracy of the single-stage rotor of the aeroengine.

Description

technical field [0001] The invention relates to an alignment error measurement method for large-scale high-speed rotary equipment based on closed-loop dynamic measurement, and belongs to the field of measurement technology. Background technique [0002] When measuring large-scale objects in three-dimensional space, various auxiliary equipment are introduced to complete comprehensive measurement, such as: lifting mechanism, rotating mechanism, translation mechanism, etc. However, the imported auxiliary measurement equipment will also introduce measurement errors. Compared with the error types and specific error values ​​introduced by different auxiliary equipment, this brings difficulties to the final measurement accuracy, and it is difficult to establish accurate error separation. model to eliminate the impact of these errors. Therefore, starting from the closed-loop connection topology, it is necessary to establish the error transmission mechanism model of each component, ...

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Problems solved by technology

[0003] At present, the main error suppression methods are as follows: (1) Use parts with higher precision, but the improvement of the precision of each part will improve the accuracy of the entire assembly to a certain extent, so it will improve the assembly quality to a certain extent. The performance index of the body, etc., but this method has limited effects, and it cannot be relied on blindly to improve the accuracy of the assembly, especially when the machining accuracy reaches the existing physical limit, the cost of improving the accuracy is very high; ( 2) The magnitude of the error of a single component is accurately measured by an external higher-level measuring device. There is a problem in this situation, that is, it is easy to ignore important errors and some key errors are difficult to measure. The coupling relationship between and the cumulative effect

Therefore, this method has some disadvantages

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