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Squirrel-cage elastic support and design method thereof

An elastic support, squirrel cage technology, applied in the rigid bracket of bearing components, calculation, mechanical equipment, etc., can solve the problems of uneven rigidity along the circumference, stress concentration of cage bars, etc., to improve the uneven rigidity , reduce stress concentration, improve the effect of stress distribution

Inactive Publication Date: 2009-09-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiency of stress concentration at the root of the cage bar and uneven rigidity along the circumference of the prior art, the present invention provides a squirrel-cage elastic bearing, the design of the elliptical slot hole can reduce the problem of stress concentration at the root of the cage bar

Method used

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  • Squirrel-cage elastic support and design method thereof
  • Squirrel-cage elastic support and design method thereof
  • Squirrel-cage elastic support and design method thereof

Examples

Experimental program
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Embodiment 1

[0024] Embodiment 1: The squirrel-cage elastic support is a cantilever structure composed of a mounting edge 1 and a sleeve 2, and the mounting edge 1 and the sleeve 2 are integrally structured. One end of the squirrel-cage elastic support is fixed on the casing bearing seat through the installation side 1, and the other end is overhanging. The sleeve 2 is equipped with a bearing to support the rotor. The sleeve 2 is provided with a plurality of oval slots 4, and forms a plurality of cage bars 3 with different widths.

Embodiment 2

[0025] Example 2: Design of squirrel cage elastic bearing.

[0026] 1) Determine parameters such as sleeve size, material, volume and stiffness. See Table 1.

[0027] Table 1

[0028]

[0029] In Table 1, the stiffness coefficient indicates the size of the structural stiffness, and its value is the ratio of the total force acting on the entire elastic support to the total displacement of the cage bar in the direction of force.

[0030] 2) Establish the equivalent simplified model of the squirrel-cage elastic bearing.

[0031] Utilizing the cyclic symmetry of the structure, the Shell63 unit is first selected in the general finite element analysis software ANSYS to establish the equivalent simplified geometric model of the unit cell of the squirrel-cage elastic bearing with an elliptical slot hole. The radius of the long and short axes is set as a variable parameter; then the unit cell model is arrayed along the circumference to generate a complete squirrel cage elastic be...

Embodiment 3

[0049] Example 3: Squirrel-cage elastic bearing design of SPEY high-pressure turbine front bearing.

[0050] 1) Determine the parameters such as the size, material, volume and stiffness of the squirrel-cage elastic bearing sleeve of the SPEY high-pressure turbine front bearing. See Table 4.

[0051] Table 4

[0052]

[0053] 2) Establish the equivalent simplified model of the squirrel-cage elastic bearing.

[0054] Utilizing the cyclic symmetry of the structure, the Shell63 element is first selected in the general finite element analysis software ANSYS to establish the equivalent simplified geometric model of the unit cell of the squirrel-cage elastic bearing with an elliptical slot hole. The long and short axis radius of the squirrel-cage elastic bearing is set as a variable parameter; then the unit cell model is arrayed along the circumferential direction to generate a complete squirrel-cage elastic bearing model and meshed to establish a finite element model of the squ...

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Abstract

The invention discloses a squirrel-cage elastic support, which is characterized in that a sleeve is provided with a plurality of oval grooves. The invention also discloses a design method for the squirrel-cage elastic support, which comprises the following steps: firstly, determining the radius, length, thickness, volume, material elastic modulus and rigidity factor of the sleeve; establishing an equivalent simplified model of the squirrel-cage elastic support in finite element software, and setting the radius of the long axis of the oval grooves Var 1, the radius of the short axis of the oval grooves Var 2 and a cage bar number Var 3 as three variable parameters; establishing an optimizing model of a sleeve structure of the squirrel-cage elastic support; and setting the species group size, random seed generating probability, mutation probability, crossover probability and genetic algebra parameters, and performing optimal design by adopting genetic algorithm. The squirrel-cage elastic support adopts a design of the oval grooves, has less design variable, and solves the problem of easy stress concentration of rectangular holes on root parts of cage bars in the prior art; and the provided design method can improve the situation of uneven rigidity in various directions along the circumference of the structure, and realizes the optimal design of the rigidity and the stress.

Description

technical field [0001] The invention relates to an elastic bearing, in particular to a squirrel-cage elastic bearing. It also relates to a design method of the squirrel-cage elastic bearing. Background technique [0002] Refer to attached figure 2 . Document 1 "Aero-engine Design Handbook: Rotor Dynamics and Machine Vibration (Volume 19) [Z]. Fu Caigao, Zheng Daping, Ou Yuanxia, ​​etc. Beijing: Aviation Industry Press, 2000." discloses a squirrel cage Type elastic bearing and its design method. The squirrel-cage elastic support disclosed in Document 1 is a cantilever structure composed of a mounting edge 1 and a sleeve 2, and the mounting edge 1 and the sleeve 2 are integrally structured. One end of the squirrel-cage elastic support is fixed on the casing bearing seat through the installation side 1, and the other end is overhanging. The sleeve 2 is equipped with a bearing to support the rotor. The sleeve 2 is provided with a plurality of rectangular slots 4, and forms ...

Claims

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Application Information

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IPC IPC(8): F16C35/06G06F17/50
Inventor 张卫红王丹王振培
Owner NORTHWESTERN POLYTECHNICAL UNIV
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