Method for establishing rotor stacking precision prediction model based on geometric algebra theory

A technology of geometric algebra and accuracy prediction, applied in geometric CAD, measuring devices, instruments, etc., can solve the problems of concentricity and unbalance, low calculation efficiency of accuracy prediction model, small concentricity, etc.

Active Publication Date: 2020-07-28
DALIAN UNIV OF TECH
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Problems solved by technology

[0006] Aiming at the deficiencies of the above-mentioned existing technologies, a method of establishing a rotor stacking accuracy prediction model based on geometric algebra theory is proposed to solve the problems of aeroengine...

Method used

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  • Method for establishing rotor stacking precision prediction model based on geometric algebra theory
  • Method for establishing rotor stacking precision prediction model based on geometric algebra theory
  • Method for establishing rotor stacking precision prediction model based on geometric algebra theory

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Embodiment Construction

[0074] Taking a certain type of rotor with N=4, m=36, the radial runout and end face runout data of each stage of the aeroengine rotor is used as an example to calculate, the process is as follows.

[0075] S1. Use the existing iMap4 comprehensive measurement and assembly platform of a certain company to measure a certain type of rotor parts, and obtain the radial runout data of the bottom spigot, the radial runout data of the top spigot, and the runout data of the upper and lower end faces; measure the height H of each part k and mass M k .

[0076] S2. Determine the pose parameters of the rotors at all levels before assembly

[0077] According to the measurement data in S1, use the least square method to calculate the center and plane equation of the upper and lower end faces of the rotors, and calculate the center of the upper and lower end faces through the radial runout data of the bottom spigot, the radial runout data of the top spigot and the height of the parts. The ...

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Abstract

The invention belongs to the technical field of aero-engine rotor stacking assembly, and provides a method for establishing a rotor stacking precision prediction model based on a geometric algebra theory. The method includes: measuring an engine rotor through precision measurement equipment, determining the position and posture of each part, and obtaining translation and rotation parameters of anupper end surface coordinate system of each part relative to a lower end surface coordinate system through calculation; utilizing a geometric algebra theory to carry out stacking modeling on each stage of parts of each rotor, and determining upper and lower end surface coordinate systems and axis vectors of each stage of rotor; calculating the concentricity and unbalance of the rotor assembly according to the stacking model; and performing dual-objective optimization on the concentricity and unbalance of the rotor assembly by using a genetic algorithm to obtain a group of optimal assembly schemes. According to the method, the calculation efficiency of aero-engine rotor stacking assembly optimization can be improved, meanwhile, it can be guaranteed that the unbalance amount and concentricity meet the requirements at the same time through double-target optimization and are in the optimal state, the assembly precision is improved, and vibration is reduced.

Description

technical field [0001] The invention belongs to the technical field of aero-engine rotor stacking and assembly, and in particular relates to a method for establishing a rotor stacking model based on geometric algebra theory. Background technique [0002] Aeroengine assembly is the last link in the manufacturing process of aeroengines, and it is also the most important manufacturing. Under the conditions of the existing aeroengine scheme and processing technology level, the quality, performance and production efficiency of the engine have an important impact on the loading capacity and working efficiency. Therefore, in the assembly process, the concentricity and unbalance of the installed rotor should be improved as much as possible to reduce the vibration of the aero-engine and improve the performance of the aero-engine. However, in actual production, the assembly of aero-engines is completely manual assembly. The level of assembly accuracy and stability depends entirely on ...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/15G01D21/02
CPCG01D21/02Y02T90/00
Inventor 李震涂建波葛浩田梁霄汪云龙孙伟
Owner DALIAN UNIV OF TECH
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