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

A multi-response and reliability technology, applied in the field of reliability theory, can solve the problems of aero-engine blisk structure with large calculation amount, failure to meet accuracy and efficiency, local blade stress failure, etc., achieve convenient ANSYS analysis function and reduce calculation cost , the effect of improving computational efficiency

Inactive Publication Date: 2018-05-15
HARBIN UNIV OF SCI & TECH
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  • Application Information

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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 i

Method used

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

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Embodiment 1

[0024] The multiple response surface method for calculating the vibration reliability of mistuned blisks includes the following steps:

[0025] a. Simulate blade detuning by changing the elastic modulus of each blade;

[0026] b. Determine the basic parameters of the blisk detuning reliability analysis as random input variables;

[0027] c. Analyze the transfer process between fluid-solid coupling loads among the influencing factors;

[0028] d. Under the influence of fluid-solid coupling load, conduct vibration modal analysis and transient response analysis on the blisk to obtain the basic parameters of the blisk vibration reliability analysis;

[0029] e. Constructing the multiple response surface method mathematical model for the reliability analysis of blade disk vibration;

[0030] f. Using the multiple response surface method to analyze the vibration reliability of the blisk;

[0031] g. Verify the effectiveness of the multiple response surface method.

Embodiment 2

[0033] According to the multiple response surface method for calculating the vibration reliability of detuned bladed disks described in Example 1, in the step a, the detuning of the bladed disk structure is mainly due to the difference between the blades caused by various factors, by changing the blade The elastic modulus is used to simulate the detuning of the blade, and the detuning is considered as a random influencing factor.

Embodiment 3

[0035] According to the multiple response surface method for calculating the vibration reliability of mistuned bladed discs described in embodiment 1, in the step b, according to the analysis of engine bladed disc vibration faults, determine the external load factors and factors affecting the vibration reliability of mistuned bladed discs Its own structural performance parameters.

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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...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/23Y02T90/00
Inventor 张春宜李成伟井慧哲
Owner HARBIN UNIV OF SCI & TECH
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