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A Dynamic Response Analysis Method for Crack Fault of Aeroengine Wheel Disk

An aero-engine, dynamic response technology, applied in instrumentation, geometric CAD, design optimization/simulation, etc., can solve the problem that the dynamic response of roulette crack cannot be accurately simulated, and the influence of nonlinear stiffness crack dynamic response of bearings is not considered, etc. problem, to achieve the effect of online quantitative positioning detection, accurate solution and accurate detection

Active Publication Date: 2021-03-23
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] From the above searches, it is found that most of the existing literature on disc crack research is based on the one-dimensional Jeffcott rotor model, and the support system is simplified. Qualitative analysis of the vibration characteristics of the crack cannot accurately simulate the dynamic response of the disc crack under actual working conditions

Method used

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  • A Dynamic Response Analysis Method for Crack Fault of Aeroengine Wheel Disk
  • A Dynamic Response Analysis Method for Crack Fault of Aeroengine Wheel Disk
  • A Dynamic Response Analysis Method for Crack Fault of Aeroengine Wheel Disk

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Embodiment

[0113] The basic parameters of the rolling bearing-rotor system in the embodiment of the present invention are shown in Table 1, and Table 1 is the basic parameter table of the rolling bearing-rotor system.

[0114] Table 1. Basic parameter list of rolling bearing-rotor system

[0115]

[0116]

[0117] see Figure 5 and Image 6 , the finite element model of the simulated rotor system is as follows Figure 5shown. Timoshenko beam elements are used to model the rotating shaft and the external support structure. The rotating shaft is divided into 21 elements, and each beam element is composed of two nodes, and each node contains 5 degrees of freedom. The four bearings are installed on nodes 2, 3, 20, and 21 respectively, and the bearings on both sides are installed back-to-back, and a pretightening force of 50N is applied to node 28. Each bearing unit is composed of two nodes, including the inner ring node and the outer ring node, which are respectively coupled with t...

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Abstract

The invention discloses a dynamic response analysis method for a crack failure of an aero-engine disc. Measure and establish the dynamic model of the disc crack; establish the quasi-static model of the bearing according to the attribute parameters of the bearing; establish the finite element model of the rotor according to the attribute parameters of the rotor; combine the dynamic model of the disc crack and the quasi-static bearing The model is combined with the rotor finite element model to establish a coupled dynamic model of the bearing-rotor system with disc cracks, and perform numerical solutions to obtain the dynamic vibration response of the rotor system to realize the dynamic response analysis of disc crack faults. The invention is closer to the actual working condition, the calculation result of the dynamic response is more accurate, and can provide theoretical guidance for the fault detection of the aeroengine.

Description

technical field [0001] The invention belongs to the field of mechanical engineering, and relates to a method for detecting a crack fault of an aero-engine disc, in particular to a dynamic response analysis method for a crack fault of an aero-engine disc. Background technique [0002] The wheel disc is a key transmission part of an aero-engine, and its working environment is harsh. Under the action of various loads such as large centrifugal load and temperature load, it is easy to produce cracks and lead to failure. The failure of the wheel will directly affect the reliability of the engine and the cost of maintenance, and even endanger the safety of the aircraft members. [0003] How to realize the on-line detection of disc cracks is a major problem in the health management of aero-engines. Due to the lack of effective online detection technology for disc cracks, fatigue strength, damage tolerance and other theories are usually used in the design stage for life-limiting des...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/20G06F119/14
CPCG06F30/15G06F2119/06G06F30/20Y02T90/00
Inventor 曹宏瑞赵军乔百杰陈雪峰
Owner XI AN JIAOTONG UNIV