Multi-response surface method for calculating vibration reliability of mistuned bladed disk

Abstract

A multi-response surface method for calculating vibration reliability of a mistuned bladed disk comprises the following specific steps: simulating mistuning of the bladed disk by changing elasticity modulus of various blades, and determining the factor which affect vibration reliability of the bladed disk; analyzing structural load in the influence factor; carrying out vibration mode analysis andtransient response analysis on the bladed disk under the influence of structural load, and acquiring basic parameters for analysis of the vibration reliability of the bladed disk; constructing a multi-response surface method mathematical model for analysis of the vibration reliability of the mistuned bladed disk; analyzing the vibration reliability of the bladed disk by using the multi-response surface method; and verifying effectiveness of the multi-response surface method. The method is high in calculating speed and high in precision, can visually show change relation of output response, andprovides a new way for analysis of reliability engineering.

Description

[0001] The invention relates to a multiple response surface method for calculating the vibration reliability of a detuned blade disk, and belongs to the technical field of reliability theory. Background technique [0002] The blisks of aeroengines are affected by aerodynamic loads, temperature loads, mechanical loads, etc., and the vibration loads they suffer are increasing, and more and more faults are caused by vibrations. The structure of aeroengine blisks usually has cyclic symmetry, but due to processing Errors, material properties, running wear and other reasons, there are inevitably slight differences in the characteristics of each blisk, that is, detuning, which destroys the cyclic symmetry of the structure and causes its vibration energy to concentrate on one or several blades, making these The amplitude of the blade reaches several times the amplitude of other blades, resulting in local stress failure of the blade, so it is very necessary to analyze the probability of...

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Problems solved by technology

[0002] The blisks of aeroengines are affected by aerodynamic loads, temperature loads, mechanical loads, etc., and the vibration loads they suffer are increasing, and more and more faults are caused by vibrations. The structure of aeroengine blisks usually has cyclic symmetry, but due to processing Errors, material properties, running wear and other reasons, there are inevitably slight differences in the characteristics of each blisk, that is, detuning, which destroys the cyclic symmetry of the structure and causes its vibration energy to concentrate on one or several blades, making these The amplitude of the blade reaches several times the amplitude of other blades, causing the stress failure of the local blade, so it is very necessary for the probability analysis of the vibration reliability of the detuned blade disk

[0003] Reliability analysis has been widely used in civil engineering, water conservancy and other fields. In recent years, it has been applied to the fields of reliability analysis and sensitivity analysis of mechanical structures. The analysis of vibration reliability of empty engine blisks is a complex dynamic probability analysis. It is also a random process problem. Using the traditional response surface method to calculate the reliability of the vibration reliability of the aero-engine blisk structure is still very large, and the efficiency is not high, which cannot meet the needs of its accuracy and efficiency.

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