Improved rotating blade-flexible casing rub-impact force determination method

A technology of rotating blades and determination methods, applied in the field of determination of rubbing force including casing flexibility, improved rotating blade-flexible casing rubbing force determination

Active Publication Date: 2017-10-03
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current rubbing failure research, the casing is mostly assumed to be a rigid body.

Method used

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  • Improved rotating blade-flexible casing rub-impact force determination method
  • Improved rotating blade-flexible casing rub-impact force determination method
  • Improved rotating blade-flexible casing rub-impact force determination method

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] In the embodiment of the present invention, an improved method for determining friction force of rotating blade-flexible casing, the flow chart of the method is as follows figure 1 shown, including the following steps:

[0047] Step 1, determine the flexible deformation of the rotating blade;

[0048] The blade is simplified as a Timoshenko beam model, and the centrifugal force, aerodynamic force, normal contact force and friction force on the blade are considered.

[0049] Step 1-1, calculate the centrifugal force of the microelement body as:

[0050] df=ρAω 2 (R d +x)dx (1)

[0051] In the formula: ρ is the material density; A is the cross-sectional area of ​​the blade; ω is the rotational angular velocity of the blade; R d is the radius of the blade disc; x is the horizontal distance from any point on the blade to the cantilever...

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Abstract

The invention relates to an improved rotating blade-flexible casing rub-impact force determination method, and belongs to the field of blade-casing system rub-impact dynamics modeling. The method is characterized in that centrifugal rigidifying, rotary softening, a Coriolis force effect and a rub-impact softening effect, which is caused by rub-impact with a casing, of a blade are considered, a flexible ring with spring supporting is used at the same time to simulate the casing, and overall and local deformation generated by the rub-impact can be considered. In addition, the invention also establishes a new rub-impact force characterization model of the blade-casing rub-impact. According to the method, influences of parameters such as a casing radius and thickness on a blade-casing rub-impact force can be reflected, and an actual blade-casing rub-impact mechanism can be more actually portrayed. Compared with using the traditional finite-element analysis, the method has the higher computational efficiency and precision. In addition, according to the method, test costs can also be greatly reduced, and reference is provided for designing of a blade-casing system structure to improve the performance and the safety of a system.

Description

technical field [0001] The invention belongs to the technical field of mechanical dynamics, and in particular relates to an improved method for determining rubbing force of a rotating blade-flexible casing, in particular to a method for determining rubbing force including casing flexibility. Background technique [0002] In an aero-engine, blade-casing rubbing will cause complex machine vibration, reduce system performance, and shorten the working life of blades and casing. For the research on the rubbing force between the blade and the casing, a typical linear spring model is used, which assumes that the normal rubbing force is proportional to the penetration depth; considering the centrifugal stiffening effect caused by the rotation of the blade, the casing is assumed to be a rigid body, Therefore, the corresponding rubbing force model is derived; the relationship between rubbing force and penetration depth is studied by Hertz elastic contact model. However, in the curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06
Inventor 马辉李炳强郭旭民孙帆谢方涛孙祺崔璨
Owner NORTHEASTERN UNIV
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