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Calculation verification method for torsional vibration modal of gas turbine pull-rod type rotor

A tie-rod rotor and tie-rod type technology, which is applied in the field of calculation and verification of the torsional vibration mode of gas turbine tie-rod rotors, can solve problems such as weakening of the torsional stiffness of the contact section, reducing the accuracy of the rotor system, and generating resonance

Inactive Publication Date: 2011-10-19
XI AN JIAOTONG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The structure of gas turbine tie rod rotor is complex, which makes the corresponding mechanical model not accurate enough, which is the main source of calculation error of rotor dynamic performance
The contact effect between the tie-rod rotor discs has a weakening effect on the torsional stiffness of the contact section, but the impact of the contact effect on the torsional stiffness of the rotor contact section is generally ignored in current engineering, which will reduce the torsional vibration modal frequency of the rotor system Calculation accuracy, so that the designed rotor may not have enough torsional vibration avoidance rate during operation and may have the risk of resonance

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  • Calculation verification method for torsional vibration modal of gas turbine pull-rod type rotor
  • Calculation verification method for torsional vibration modal of gas turbine pull-rod type rotor
  • Calculation verification method for torsional vibration modal of gas turbine pull-rod type rotor

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Embodiment Construction

[0032] An embodiment of the present invention is: the structure of the contact section of the experimental rod rotor is as follows figure 1 As shown, the rotor has 7 identical contact segments. The surface profile curve of the contact surface of the rotor disc is as follows: figure 2 As shown, it is the mean square value σ of the asperity height of the contact surface of the wheel disk measured by the SG201P surface topography instrument m 0.96μm, the average radius of curvature R s is 290 μm, and the asperity distribution density is 7.11×10 7 / m 2 . Modulus of elasticity of wheel material E 0 2.06×10 11 Pa, the equivalent elastic modulus E is 1.132×10 11 Pa, Poisson's ratio v is 0.3, and the maximum static friction coefficient is 0.2, μ.

[0033] A method for calculating and verifying the torsional vibration mode of a tie-rod rotor of a gas turbine comprises the following steps:

[0034] 1. Establish the transfer matrix equation of the tie rod rotor contact section ...

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Abstract

The invention discloses a calculation verification method for the torsional vibration modal of a gas turbine pull-rod type rotor, comprising the steps of: (1) establishing a transfer matrix equation of a pull-rod rotor contact section, and then introducing a contact section torsional rigidity correction coefficient in the equation; (2) calculating the torsional rigidity correction coefficient of the pull-rod rotor contact section in the equation; (3) calculating the modal frequency and the modal vibration mode of the rotor via a transfer matrix method by utilizing the transfer matrix equationand the torsional rigidity correction coefficient value of the pull-rod rotor contact section, wherein the contact effect of the rotor contact section is considered in the calculation; and (4) testing the torsional vibration modal frequencies of an experimental pull-rod rotor under different pre-tightening forces via a torsional vibration modal experiment, and comparing with the calculated result. According to the method disclosed by the invention, the influence of the contact effect on the calculation of the torsional vibration modal of the pull-rod type rotor can be efficiently considered and the torsional vibration modal frequency of the pull-rod type rotor can be more accurately calculated, thus a reliable basis is provided for reasonably designing the torsional vibration characteristics of the rotors of the type.

Description

technical field [0001] The invention relates to a method for calculating and verifying the torsional vibration mode of a rotor, in particular to a method for calculating and verifying the torsional vibration mode of a rod-type rotor of a gas turbine whose contact surface between discs is plane. Background technique [0002] The structure of gas turbine tie-rod rotor is complex, which makes the corresponding mechanical model inaccurate and is the main source of error in the calculation of rotor dynamic performance. The contact effect between the tie-rod rotor discs has a weakening effect on the torsional stiffness of the contact section, but the impact of the contact effect on the torsional stiffness of the rotor contact section is generally ignored in current engineering, which will reduce the torsional vibration modal frequency of the rotor system The accuracy of the calculation may make the designed rotor not have enough torsional vibration avoidance rate during operation,...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 袁奇高进李浦
Owner XI AN JIAOTONG UNIV
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