CN116146645A - Multi-frequency-point damping modulation extrusion film damper - Google Patents

Multi-frequency-point damping modulation extrusion film damper Download PDF

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Publication number
CN116146645A
CN116146645A CN202310134865.6A CN202310134865A CN116146645A CN 116146645 A CN116146645 A CN 116146645A CN 202310134865 A CN202310134865 A CN 202310134865A CN 116146645 A CN116146645 A CN 116146645A
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CN
China
Prior art keywords
extrusion
extrusion plate
squeeze
film damper
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310134865.6A
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Chinese (zh)
Inventor
罗均
刘畅
李雪平
蒲华燕
秦毅
白如清
元书进
王刚
徐浪
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Chongqing University
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Chongqing University
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Filing date
Publication date
Application filed by Chongqing University filed Critical Chongqing University
Priority to CN202310134865.6A priority Critical patent/CN116146645A/en
Publication of CN116146645A publication Critical patent/CN116146645A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
    • F16F9/535—Magnetorheological [MR] fluid dampers

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The invention discloses a multi-frequency-point damping modulation squeeze film damper, which comprises a shell, an extrusion piece and a plurality of harmonic oscillators, wherein the extrusion piece comprises a first extrusion plate, a second extrusion plate and a damping liquid squeeze film arranged between the first extrusion plate and the second extrusion plate in sequence from top to bottom, an installation cavity is formed in the first extrusion plate, the harmonic oscillators are connected with a first elastic sealing piece, and the damping liquid squeeze film is contacted with the first elastic sealing piece; according to the invention, the push rod is fixedly connected to a platform or a structure to be damped and a carrier platform, a damping liquid extrusion film is formed by the relative motion between the first extrusion plate and the second extrusion plate in the vibration process, the boundary excitation is applied to the harmonic oscillator by the fluid load of the extrusion film, the first extrusion plate and the harmonic oscillator generate forced vibration, the amplitude frequency and the phase frequency characteristics of the harmonic oscillator distributed on the first extrusion plate can be changed by the harmonic oscillator on the first extrusion plate, and a plurality of resonance frequency points are obtained, so that a plurality of resonance points of the platform or the structure to be damped are simultaneously restrained.

Description

Multi-frequency-point damping modulation extrusion film damper
Technical Field
The invention relates to the technical field of ultra-precise vibration reduction, in particular to a multi-frequency-point damping modulation extrusion film damper.
Background
Suppressing resonance amplification has a significant impact on the performance of the mechanical device. Vibration suppression of the resonance frequency point peak response needs to be realized with large damping, but for high-frequency vibration, the large damping can cause vibration deterioration; the traditional passive (passive) frequency-dependent damping can realize low-frequency large damping and medium-high frequency small damping, but the medium-high frequency small damping cannot realize an effective vibration suppression effect on multiple line spectrum vibration of a rotary machine. How to realize vibration suppression of a plurality of line spectrum frequency points on the basis of low-frequency large damping and high-frequency small damping is a scientific problem to be solved urgently.
Typically, dampers achieve a damping effect by shearing or squeezing a viscous fluid, and for newtonian fluids, the damping coefficient of the damper does not change with frequency. For the squeeze film type damper, the squeeze surface with the elastic foundation has a specific natural frequency, the elastic foundation generates forced vibration under the action of the fluid load of the squeeze film, the phase of vibration of the elastic foundation can change after the natural frequency is reached, the local squeeze amplitude is increased, a larger damping force is generated, the local squeeze amplitude is reduced due to the change of the phase after the squeeze frequency is larger than the natural frequency of the elastic foundation, a smaller damping force is generated, and the rheological property of the squeeze film which changes along with the frequency is generated due to the vibration characteristic of the elastic foundation. The fluid load of the extrusion film has strong coupling effect on the natural frequency of the elastic extrusion surface, the rigidity, the quality and the damping parameters of the elastic foundation can influence the natural frequency and the forced vibration characteristic of the elastic foundation, the rheological characteristic of the extrusion film is changed, and the rheological characteristic of the extrusion film can also change the natural frequency of the elastic foundation in turn.
The layout and the modal order of the distributed elastic foundation are the foundation for realizing the accurate regulation and control of the large damping frequency point, and meanwhile, the frequency response characteristics of the distributed elastic foundation, including the vibration response amplitude and the phase, are considered, the amplitude phase is influenced by the mass and the area of the elastic foundation, but the rheological mechanism influenced by the elastic foundation is still unclear at present.
The extrusion film type self-tuning vibration absorber comprises a spring vibrator and an extrusion bottom plate, wherein a liquid film is arranged between the spring vibrator and the extrusion bottom plate, when the spring vibrator vibrates, the extrusion liquid film generates damping force to dissipate vibration energy, and the extrusion surfaces of the spring vibrator and the extrusion bottom plate have super-hydrophobic characteristics or surface pore structures so as to reduce the damping force; however, in the technical scheme, only low-frequency large damping and medium-high frequency small damping can be realized, but for the vibration of a plurality of line spectrums of the rotary machine, the medium-high frequency small damping cannot realize an effective vibration suppression effect.
In order to solve the problems, the invention provides a multi-frequency-point damping modulation squeeze film damper, which solves the problem that the conventional squeeze film damper is poor in damping effect.
Disclosure of Invention
The invention aims to provide a multi-frequency-point damping modulation squeeze film damper, which achieves the purpose of improving the vibration effect of the damper.
In order to achieve the above object, the present invention provides the following solutions:
the utility model provides a multifrequency point damping modulation extrusion membrane attenuator, includes the casing, sets up extrusion piece and a plurality of natural frequency adjustable harmonic oscillator in the casing, the extrusion piece includes from the top down sets gradually first stripper, second stripper and sets up damping fluid extrusion membrane between first stripper and the second stripper, set up the installation cavity that is used for installing the harmonic oscillator on the first stripper, the installation cavity through the first elastic sealing spare that the bottom set up with damping fluid separates, the harmonic oscillator with first elastic sealing spare is connected, damping fluid extrusion membrane with first elastic sealing spare contact.
Preferably, the harmonic oscillator comprises an upright post, a first mass block, a second mass block and a spring, wherein the bottom end of the upright post is arranged in the installation cavity, the top end of the upright post extends out of the installation cavity, the first mass block is arranged at the bottom end of the upright post, the second mass block is arranged at the top end of the upright post, the spring is sleeved on the part, extending out of the installation cavity, of the upright post, two ends of the spring are respectively abutted to the second mass block and the first extrusion plate, and the first mass block is connected with the first elastic sealing element.
Preferably, the mounting cavity comprises a connecting channel and a mounting chamber which are communicated with each other, the upright extends into the mounting chamber through the connecting channel, and the first mass block is arranged in the mounting chamber.
Preferably, a first limiting sleeve is arranged in the connecting channel, and the inner wall of the first limiting sleeve is not contacted with the outer wall of the upright post and is used for ensuring the upright post to vertically move in the connecting channel.
Preferably, a second elastic sealing member is provided on the first pressing plate in the circumferential direction, and the second elastic sealing member abuts against the inner wall of the housing.
Preferably, the damping device further comprises a first connecting rod connected with the first extrusion plate and a second connecting rod connected with the second extrusion plate, wherein the first connecting rod and the second connecting rod extend out of the shell through a first through hole and a second through hole respectively and are connected with the damped object and the carrying platform respectively.
Preferably, a connecting part is arranged on the first extrusion plate, and the first connecting rod is connected with the connecting part through a positioning pin.
Preferably, a shearing fork mechanism and a ball screw are arranged between the second connecting rod and the second extrusion plate, one end of the shearing fork mechanism is connected with the second connecting rod, the other end of the shearing fork mechanism is connected with the second extrusion plate, and the ball screw is used for adjusting the lifting of the shearing fork mechanism and extends to the outside of the shell.
Preferably, the plurality of resonators are uniformly arranged on a circle with the same radius by taking the center of the first extrusion plate as the center of a circle.
Preferably, a plurality of elastic limiting elements are arranged on the top surface inside the shell, and the distance between the bottom of each elastic limiting element and the first extrusion plate is smaller than the distance between the top end of each upright post and the top surface inside the shell.
Compared with the prior art, the invention has the following technical effects:
1. according to the invention, the first connecting rod and the second connecting rod are fixedly connected to a platform or a structure to be damped and a carrier platform, a damping liquid extrusion film is formed by the relative motion between the first extrusion plate and the second extrusion plate in the vibration process, the fluid load of the extrusion film applies boundary excitation to the harmonic oscillator, the first extrusion plate and the harmonic oscillator generate forced vibration, and the amplitude frequency and the phase frequency characteristics of the first extrusion plate are changed by a plurality of harmonic oscillators distributed on the first extrusion plate, so that a plurality of resonance frequency points are obtained, and a plurality of resonance points of the platform or the structure to be damped are restrained at the same time.
2. The harmonic oscillator comprises an upright post, a first mass block, a second mass block and a spring, wherein the bottom end of the upright post is arranged in the mounting cavity, the top end of the upright post extends out of the mounting cavity, the first mass block is arranged at the bottom end of the upright post, the second mass block is arranged at the top end of the upright post, the spring is sleeved on the part, extending out of the mounting cavity, of the upright post, two ends of the spring are respectively abutted against the second mass block and the first extrusion plate, and the first mass block is connected with the first elastic sealing element; the natural frequency of the harmonic oscillator is changed by adjusting the weights of the first mass block and the second mass block, so that the amplitude frequency and the phase frequency characteristics of the first extrusion plate are changed.
3. In the invention, a shearing fork mechanism and a ball screw are arranged between the second connecting rod and the second extrusion plate, one end of the shearing fork mechanism is connected with the second connecting rod, the other end of the shearing fork mechanism is connected with the second extrusion plate, the ball screw is used for adjusting the lifting of the shearing fork mechanism and extending to the outside of the shell, and the height of the shearing fork mechanism is adjusted through the ball screw, so that the thickness of a damping liquid extrusion film between the first extrusion plate and the second extrusion plate is further finished, and the damping force is controlled and adjusted.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings that are necessary for the embodiments will be briefly described below, it being evident that the drawings in the following description are only some embodiments of the invention and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a main sectional view of the present invention;
FIG. 2 is a top view of the present invention;
wherein, 1, a first connecting rod; 2. a housing; 3. an elastic limit element; 4. a second resilient sealing element; 5. a first pressing plate; 6. a second pressing plate; 7. a third resilient sealing element; 8. a ball screw; 9. a scissors mechanism; 10. a first resilient sealing element; 11. a second connecting rod; 12. a first mass; 13. a column; 14. a first stop collar; 15. a second mass; 16. a positioning pin; 17. and the second limiting sleeve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a multi-frequency-point damping modulation squeeze film damper, which achieves the purpose of improving the vibration effect of the damper.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1 to 2, a multi-frequency damping modulation squeeze film damper comprises a shell 2, an extrusion piece arranged in the shell 2 and a plurality of resonators with adjustable natural frequencies, wherein the extrusion piece comprises a first extrusion plate 5, a second extrusion plate 6 and a damping liquid squeeze film arranged between the first extrusion plate 5 and the second extrusion plate 6 from top to bottom, an installation cavity for installing the resonators is formed in the first extrusion plate 5, the installation cavity is separated from damping liquid through a first elastic sealing piece arranged at the bottom, the resonators are connected with the first elastic sealing piece, and the damping liquid squeeze film is in contact with the first elastic sealing piece; according to the invention, the first connecting rod and the second connecting rod are fixedly connected to a platform or a structure and a carrier platform which need to be damped, a damping liquid extrusion film is formed by the relative motion between the first extrusion plate 5 and the second extrusion plate 6 in the vibration process, the fluid load of the extrusion film applies boundary excitation to the harmonic oscillator, the first extrusion plate 5 and the harmonic oscillator generate forced vibration, and the amplitude frequency and the phase frequency characteristics of the harmonic oscillator distributed on the first extrusion plate 5 can be changed by the first extrusion plate 5, so that a plurality of resonance frequency points are obtained, and a plurality of resonance points of the platform or the structure which need to be damped are restrained at the same time.
Referring to fig. 1, the harmonic oscillator comprises a vertical column 13 with the bottom end arranged in the mounting cavity and the top end extending out of the mounting cavity, a first mass block 12 arranged at the bottom end of the vertical column 13, a second mass block 15 arranged at the top end of the vertical column 13, and a spring sleeved on the part of the vertical column 13 extending out of the mounting cavity, wherein two ends of the spring are respectively abutted against the second mass block 15 and the first extrusion plate 5, and the first mass block 12 is connected with the first elastic sealing element 10; the natural frequency of the harmonic oscillator is changed by adjusting the weights of the first mass block 12 and the second mass block 15, thereby changing the amplitude frequency and the phase frequency characteristics of the first compression plate 5.
Referring to fig. 1, the mounting cavity includes a connection passage and a mounting chamber which are communicated with each other, and the column 13 extends into the mounting chamber through the connection passage, and the first mass 12 is disposed in the mounting chamber.
Referring to fig. 1, a first stop collar 14 is disposed in the connection channel, and an inner wall of the first stop collar 14 is not in contact with an outer wall of the upright 13 and is used for ensuring vertical movement of the upright 13 in the connection channel.
Referring to fig. 1 to 2, a second elastic sealing member 4 is provided in the circumferential direction of the first pressing plate 5, and the second elastic sealing member abuts against the inner wall of the housing 2.
Referring to fig. 1 to 2, the vibration damping device further comprises a first connecting rod 1 connected with the first extrusion plate 5, and a second connecting rod 11 connected with the second extrusion plate, wherein the first connecting rod 1 and the second connecting rod 11 extend out of the shell 2 through a first through hole and a second through hole respectively and are connected with a vibration damping object and the object carrying platform respectively.
Referring to fig. 1 to 2, a first compression plate 5 is provided with a connection portion, and a first connection rod 1 is connected to the connection portion by a positioning pin 16.
Referring to fig. 2, a scissor mechanism 9 and a ball screw 8 are arranged between the second connecting rod and the second extrusion plate 6, one end of the scissor mechanism 9 is connected with the second connecting rod, the other end is connected with the second extrusion plate 6, and the ball screw 8 is used for adjusting the lifting of the scissor mechanism 9 and extends to the outside of the shell 2; the height of the shearing fork mechanism 9 is adjusted through the ball screw 8, and then the thickness of the damping liquid extrusion film between the first extrusion plate 5 and the second extrusion plate 6 is finished, so that the damping force is controlled and adjusted.
Further, the plurality of resonators are uniformly arranged on the same radius circle with the center of the first extrusion plate 5 as the center of a circle.
Referring to fig. 1 to 2, a plurality of elastic limiting elements 3 are provided on the inner top surface of the housing 2, and the distance between the bottom of the elastic limiting elements 3 and the first extrusion plate 5 is smaller than the distance between the top end of the upright post and the inner top surface of the housing 2.
Referring to fig. 1, a second elastic sealing member 4 is provided between the first pressing plate 5 and the housing 2, and a third elastic sealing member 7 is provided between the ball screw 8 and the housing 2.
Referring to fig. 2, a second stop collar 17 is provided between the first link and the housing 2.
The adaptation to the actual need is within the scope of the invention.
It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. The utility model provides a multifrequency point damping modulation extrusion membrane attenuator, its characterized in that, is in including casing, setting extrusion piece and a plurality of natural frequency adjustable harmonic oscillator in the casing, the extrusion piece includes from the top down sets gradually first stripper, second stripper and sets up damping fluid extrusion membrane between first stripper and the second stripper, set up the installation cavity that is used for installing the harmonic oscillator on the first stripper, the installation cavity through the first elastic sealing member that the bottom set up with damping fluid separates, the harmonic oscillator with first elastic sealing member is connected, damping fluid extrusion membrane with first elastic sealing member contact.
2. The multi-frequency point damping modulation squeeze film damper according to claim 1, wherein the harmonic oscillator comprises a vertical column with the bottom end arranged in the installation cavity, the top end of the vertical column extends out of the installation cavity, a first mass block arranged at the bottom end of the vertical column, a second mass block arranged at the top end of the vertical column and a spring sleeved on the part, extending out of the installation cavity, of the vertical column, two ends of the spring are respectively abutted against the second mass block and the first squeeze plate, and the first mass block is connected with the first elastic sealing element.
3. The multi-frequency point damping modulation squeeze film damper of claim 2, wherein the mounting cavity comprises a connecting channel and a mounting chamber in communication with each other, the post extends into the mounting chamber through the connecting channel, and the first mass is disposed within the mounting chamber.
4. The multi-frequency point damping modulation squeeze film damper according to claim 3, wherein a first limit sleeve is arranged in the connecting channel, and the inner wall of the first limit sleeve is not contacted with the outer wall of the upright post and is used for guaranteeing the vertical movement of the upright post in the connecting channel.
5. The multi-frequency point damping modulation squeeze film damper as claimed in claim 1, wherein a second elastic sealing member is provided in a circumferential direction of the first squeeze plate, and the second elastic sealing member abuts against an inner wall of the housing.
6. The multi-frequency point damping modulation squeeze film damper of claim 1, further comprising a first connecting rod connected with the first squeeze plate, a second connecting rod connected with the second squeeze plate, wherein the first connecting rod and the second connecting rod extend out of the housing through a first through hole and a second through hole respectively and are connected with a damped object and an object carrying platform respectively.
7. The multi-frequency point damping modulation squeeze film damper of claim 6, wherein a connecting portion is provided on the first squeeze plate, and the first connecting rod is connected with the connecting portion through a positioning pin.
8. The multi-frequency point damping modulation squeeze film damper according to claim 6, wherein a scissor mechanism and a ball screw are arranged between the second connecting rod and the second squeeze plate, one end of the scissor mechanism is connected with the second connecting rod, the other end of the scissor mechanism is connected with the second squeeze plate, and the ball screw is used for adjusting lifting of the scissor mechanism and extends to the outside of the shell.
9. The multi-frequency point damping modulation squeeze film damper as claimed in claim 1, wherein the plurality of resonators are uniformly arranged on a circle with the same radius with the center of the first squeeze plate as a center.
10. The multi-frequency point damping modulation squeeze film damper according to claim 1, wherein a plurality of elastic limiting elements are arranged on the top surface inside the shell, and the distance between the bottom of each elastic limiting element and the first squeeze plate is smaller than the distance between the top end of each upright post and the top surface inside the shell.
CN202310134865.6A 2023-02-20 2023-02-20 Multi-frequency-point damping modulation extrusion film damper Pending CN116146645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310134865.6A CN116146645A (en) 2023-02-20 2023-02-20 Multi-frequency-point damping modulation extrusion film damper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310134865.6A CN116146645A (en) 2023-02-20 2023-02-20 Multi-frequency-point damping modulation extrusion film damper

Publications (1)

Publication Number Publication Date
CN116146645A true CN116146645A (en) 2023-05-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310134865.6A Pending CN116146645A (en) 2023-02-20 2023-02-20 Multi-frequency-point damping modulation extrusion film damper

Country Status (1)

Country Link
CN (1) CN116146645A (en)

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