Blade crack identification method for mistuned blisk

By establishing a three-dimensional geometric model and dynamic model, breathing cracks in the overall leaf disc are simulated and harmonic indicators are defined, the problem of difficulty in identifying blade cracks in the overall leaf disc is solved, and accurate identification and positioning is achieved under detuning conditions.

CN119761110AActive Publication Date: 2025-04-04DALIAN UNIV OF TECH
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Patent Information

Application Number
CN202411809152.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-04-04
Estimated Expiration
2044-12-10

AI Technical Summary

Technical Problem

The prior art is difficult to effectively identify blade cracks in the overall leaf disc, especially when the crack is not obvious enough in the early stage, and the detuning phenomenon is similar to the crack, making it difficult to distinguish, resulting in difficulty in identification.

Method used

By establishing three-dimensional geometric models of intact leaf discs and crack-containing leaf discs, building a dynamic model, and applying nonlinear contact forces to simulate respiratory cracks, perform steady-state response analysis and establishment of finite element models, defining harmonic indicators of the overall leaf discs and blades to identify and locate respiratory cracks.

Benefits of technology

It realizes accurate identification and positioning of respiratory cracks in the overall leaf disc under detuning conditions, can detect newly emerging cracks in early stages and identify the existence of multiple cracks, thereby preventing serious consequences.

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Abstract

The invention provides a blade crack identification method for a mistuned blisk. The method comprises the following steps: carrying out geometric model modeling on a blisk and a blisk containing cracks under a random detuning condition; a blisk model is simplified, a blisk lumped parameter model is constructed, response analysis is conducted on the blisk system containing crack detuning on the basis of a non-linear contact force mode, and steady-state response of all blades is obtained through calculation and analyzed; finite element models are established for the three-dimensional geometry of the complete blade and the crack-containing blade; performing resonance state and non-resonance state vibration response on the intact bladed disc and the bladed disc containing the breathing crack in the detuning state, and analyzing corresponding frequency domain response; based on the vibration response characteristics of the blisk, the harmonic index of the blisk and the harmonic index of the blisk blade are defined, the positioning and identification of the crack of the blisk containing the crack can be effectively carried out by using the harmonic index, and a basis and guidance are provided for the identification of the crack in the blisk.
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