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Gas film rigidity measuring method of gas bearing

A technology of gas bearing and gas film stiffness, which is applied in the direction of measuring devices, elastic testing, mechanical parts testing, etc., and can solve the problems of large measurement error and low precision of gas film stiffness

Pending Publication Date: 2022-01-18
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the gas film stiffness of a gas bearing to solve the technical problems in the prior art that the measurement error of the gas film stiffness of the gas bearing is large and the precision is low

Method used

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  • Gas film rigidity measuring method of gas bearing

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specific Embodiment 1

[0040] The gas film stiffness measuring method of the gas bearing of the present invention mainly comprises the following steps:

[0041] (1) Set the gas bearing to be tested on the shaft system, maintain the relative position of the gas bearing and the shaft system through the holder, and make the gas bearing to be tested and the shaft system have an eccentric distance;

[0042] (2) Under the condition of no gas lubrication, apply external excitation to the gas bearing to be tested, and calculate the non-lubricating stiffness k of the gas bearing according to the vibration of the gas bearing B ;

[0043] (3) In the state of lubricating gas in the gas bearing cavity, drive the shafting to rotate, apply the external excitation to the gas bearing to be tested, and process and calculate the composite stiffness of the gas bearing when there is gas lubrication according to the vibration of the gas bearing k BQ ;

[0044] (4) according to k BQ =k Q +k B Calculate, calculate the ...

specific Embodiment 2

[0066] The difference between it and the specific embodiment 1 is: in the process of hoisting and fixing the gas bearing to be tested on the support frame, the clamping line between the center of the gas bearing to be tested and the center of the shafting and the vertical plane The angle is less than 90°. In the state of lubricating gas and non-lubricating gas, the direction of the external excitation applied to the gas bearing to be tested passes through the center of the gas bearing to be tested, and the external excitation point on the gas bearing to be tested, the center of the gas bearing to be tested and the center of the shafting are in common line arrangement to measure the gas film stiffness of the gas bearing to be tested in the direction of the extension of the line between the center of the gas bearing to be tested and the center of the shafting.

specific Embodiment 3

[0068] The difference between it and the specific embodiment 1 is: in the process of hoisting and fixing the gas bearing to be tested on the support frame, the angle between the line between the center of the gas bearing to be tested and the center of the shafting and the vertical plane is made less than 90°. In the state of lubricating gas and non-lubricating gas, an external excitation in the horizontal direction is applied to the gas bearing to be tested, so as to measure the gas film stiffness of the gas bearing to be tested in the horizontal direction.

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Abstract

The invention relates to a gas film rigidity measuring method of a gas bearing. In the method for measuring the gas film rigidity of the gas bearing, the to-be-measured gas bearing is fixed through the retainer, the retainer and the to-be-measured gas bearing form a spring mass system, an eccentric distance is formed between the to-be-measured gas bearing and a shaft system, and according to the vibration condition of the gas bearing, external excitation is applied to the to-be-measured gas bearing under the condition of no lubricating gas, the non-lubrication rigidity of the gas bearing is measured, the external excitation is applied to the gas bearing to be measured in the presence of lubricating gas, the composite rigidity of the gas bearing is measured, and then the rigidity obtained through two times of measurement is subtracted to obtain the gas film rigidity of the gas bearing. The rigidity of the gas bearing is calculated and measured according to the vibration condition of the gas bearing subjected to external excitation, the measurement error of the gas film rigidity of the gas bearing can be reduced, and the measurement precision of the gas film rigidity of the gas bearing is improved.

Description

technical field [0001] The invention relates to the testing field of bearings, in particular to a method for measuring gas film stiffness of gas bearings. Background technique [0002] Supercritical carbon dioxide gas lubricated bearings are important auxiliary parts of supercritical carbon dioxide high-speed turbine generators, and their main functions are to reduce the temperature of the shaft system and provide auxiliary support. The auxiliary support stiffness of the gas bearing, that is, the gas film stiffness, is one of the factors that must be considered in the shafting design. [0003] In the prior art, the detection of the gas film stiffness of the gas bearing is to measure the gas film stiffness of the gas bearing through a perturbation method under the running state of the gas bearing. However, in the actual engineering application of gas bearings, due to the compressibility of the gas, the stiffness of the gas film in the bearing cavity is greatly affected by th...

Claims

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Application Information

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IPC IPC(8): G01M5/00G01M13/045
CPCG01M5/0066G01M13/045
Inventor 李济顺李俊杨芳薛玉君马喜强李伦余永健郭楠司东宏隋新
Owner HENAN UNIV OF SCI & TECH
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