Method for identifying dynamic coefficient of squeeze film damper

A technology of squeezing oil film damping and identification methods, which is applied in the testing of machines/structural components, testing material strength by applying repetitive force/pulsation force, testing material strength by applying stable tension/pressure, etc., which can solve difficult on-site testing Squeeze oil film damper dynamic coefficient and other issues, to achieve the effect of low cost of experimental equipment, simple calculation, strong engineering

Pending Publication Date: 2021-12-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that the existing experimental device is difficult to test the dynamic coefficient of the squeeze film damper during the rotation process of the rotor on site, and further provides an identification method for the dynamic coefficient of the squeeze film damper;

Method used

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  • Method for identifying dynamic coefficient of squeeze film damper
  • Method for identifying dynamic coefficient of squeeze film damper
  • Method for identifying dynamic coefficient of squeeze film damper

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specific Embodiment approach 1

[0090] Specific implementation mode one: refer to Figure 1 to Figure 11 Describe this embodiment, this embodiment provides a kind of identification method of dynamic coefficient of squeeze oil film damper, it is characterized in that: described identification method is realized through the following steps:

[0091] Step 1: Determine the force transmission coefficient K of the elastic squirrel cage support seat in the squeeze film damper in ;

[0092] Step 2: Determine the force transmission coefficient K of the support seat of the damper outer ring in the squeeze film damper out ;

[0093] Step 3: Use the force transmission coefficient K of the elastic squirrel cage support seat obtained in Step 1 in Determine the excitation force F transmitted by the rotor to the elastic squirrel cage support seat when the rotational speed N=nr / min is obtained in | N＝n ;

[0094] Step 4: Use the force transmission coefficient K of the damper outer ring support seat obtained in Step 2 ...

specific Embodiment approach 2

[0096] Specific implementation mode two: refer to Figure 1 to Figure 9 Describe this embodiment, this embodiment is to further limit the step one described in the specific embodiment one, in this embodiment, the force transmission coefficient K of the elastic squirrel cage support seat in the squeeze oil film damper is determined in the step one in Specifically, it is achieved through the following steps:

[0097] Step 11: Install the elastic squirrel cage support seat 5 on the fixing device, and install an elastic squirrel cage support seat for load bearing by interference fit at the installation stop 5b of the elastic squirrel cage support seat bearing plate on the elastic squirrel cage support seat 5 Disc 19, the load-bearing bar 20 is passed in the central through hole of the elastic squirrel cage support seat load-bearing disc 19, and guarantees that the moment arms of the elastic squirrel cage support seat load-bearing disc 19 two ends load-bearing bar 20 are identical;...

specific Embodiment approach 3

[0116] Specific implementation mode three: refer to Figure 1 to Figure 11 Describe this embodiment, this embodiment is to further limit the step 2 described in the second specific embodiment, in this embodiment, the force transmission coefficient K of the damper outer ring support seat in the squeeze oil film damper is determined in the step 2 out Specifically, it is achieved through the following steps:

[0117] Step 21: Install the damper outer ring support seat 7 on the fixing device, and install a damper outer ring with interference fit at the installation stop 7a of the damper outer ring support seat load-bearing plate on the damper outer ring support seat 7 Ring support seat load-bearing plate 24, pass the load-bearing rod 20 through the center through hole of the damper outer ring support seat load-bearing plate 24, and ensure that the moment arms of the load-bearing bars 20 at both ends of the damper outer ring support seat load-bearing plate 24 are the same;

[0118...

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Abstract

The invention discloses a method for identifying the dynamic coefficient of a squeeze film damper, belongs to the field of rotor dynamics, and aims to solve the problem that the dynamic coefficient of the squeeze film damper in the rotor rotation process is difficult to test on site by the conventional experimental device. The method depends on a traditional squeeze film damper test device, static loading testing is carried out on an elastic squirrel cage supporting seat and a damper outer ring supporting seat, strain-force transfer coefficients of corresponding structures are measured and calibrated, and when a rotor works normally, strain of cage bar structures on the elastic squirrel cage supporting seat and the damper outer ring supporting seat is monitored; and according to the calibration of the relationship between the strain and the force of the cage strips in the elastic squirrel cage supporting seat and the damper outer ring supporting seat, the external transmission force of the dynamic exciting force of the rotor passing through the elastic squirrel cage supporting seat and the damper outer ring supporting seat is obtained, and the identification of the dynamic coefficient of the squeeze film damper is realized. According to the method, the dynamic coefficients of the squeeze film damper under different rotating speeds of the rotor can be easily identified.

Description

technical field [0001] The invention relates to the field of rotor dynamics, in particular to a method for identifying dynamic coefficients of a squeeze oil film damper. Background technique [0002] Squeeze oil film damper is a mechanical structure with simple structure and friendly vibration damping performance. It is widely used in aero-engines and gas turbines to effectively reduce the vibration of the unit and improve the reliability of equipment operation. [0003] The dynamic coefficient is the key parameter to measure the vibration reduction performance of the squeeze film damper, so it is necessary to test the dynamic coefficient (especially the damping coefficient) of the squeeze film damper, especially to obtain the The damping coefficient is helpful to quantify the vibration reduction performance of the damper and provide a reference for the subsequent optimal design of the damper. However, the existing experimental devices and methods are difficult to test the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01N19/00G01N3/08G01N3/06G01N3/34G01N3/14G01B7/04
CPCG01M13/00G01N19/00G01N3/08G01N3/34G01N3/14G01N3/066G01B7/04G01N2203/0005G01N2203/0026G01N2203/0032G01N2203/0617G01N2203/0676
Inventor 张广辉黄延忠陈亚龙马会防龚文杰徐科繁国阳
Owner HARBIN INST OF TECH
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