CN116592078A - Self-adaptive rigidity-variable damping vibration isolator - Google Patents

Self-adaptive rigidity-variable damping vibration isolator Download PDF

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Publication number
CN116592078A
CN116592078A CN202310321543.2A CN202310321543A CN116592078A CN 116592078 A CN116592078 A CN 116592078A CN 202310321543 A CN202310321543 A CN 202310321543A CN 116592078 A CN116592078 A CN 116592078A
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China
Prior art keywords
vibration
damping
electromagnet
electromagnetic
variable
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CN202310321543.2A
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翟国庆
李函鑫
李争光
仇俊易
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN202310321543.2A priority Critical patent/CN116592078A/en
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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
    • F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
    • 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
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/002—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion characterised by the control method or circuitry
    • 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
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/06—Stiffness
    • F16F2228/066—Variable stiffness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The invention discloses a self-adaptive variable-rigidity variable-damping vibration isolator, which comprises a vibration isolation unit and an electromagnetic actuator unit; the vibration isolation unit comprises a base, vibration isolation elements and a load platform, wherein the vibration isolation elements are arranged on the base and used for supporting the load platform; the electromagnetic actuator unit comprises a first electromagnet, a second electromagnet and a variable stiffness and damping control unit; the second electromagnet is arranged on the base, and the first electromagnet is positioned below the load platform and is arranged opposite to the second electromagnet; the variable stiffness and damping control unit comprises a vibration sensor, a main control board and a current control module. The invention adopts the method of combining f/f 0 The related damping and rigidity intelligent control strategy can effectively control vibration with wide frequency band and wide dynamic load range, remarkably improve the vibration isolation performance of the traditional vibration isolation system and realize broadband vibration isolation.

Description

Self-adaptive rigidity-variable damping vibration isolator
Technical Field
The invention relates to the technical field of vibration and noise control, in particular to a self-adaptive variable-rigidity variable-damping vibration isolator.
Background
Active and passive vibration isolation technologies are widely used in the technical fields of electromechanical equipment and engineering, and spring vibration isolators with fixed stiffness are widely used in vibration isolation systems due to the advantages of low natural frequency, high stiffness, strong load capacity and the like. However, the low-frequency vibration isolation efficiency of the spring vibration isolator is obviously insufficient, and the natural frequency f is less than or equal to ∈2 times of the vibration frequency f of the vibration source 0 When the vibration transmissibility is larger than 1, the vibration amplitude of the vibration isolation object above the vibration isolator is larger, and challenges such as potential safety hazard, reduction of the service life of equipment and the like are generated.
The patent specification with the publication number of CN104455139A discloses a spring vibration isolation device based on self-adaptive electromagnetic damping, and the size and the direction of the current in a variable resistor control coil are controlled so that the electromagnetic damping force direction of the current coil subjected to a magnetic field is always opposite to the vibration speed direction, so that vibration isolation requirements of different occasions are met. The vibration isolation system disclosed in this patent suffers from the following drawbacks: firstly, the coil and the spring of the system are fixed or wound together, so that the coil turns in the permanent magnet magnetic field are relatively less, the total length of the lead is relatively shorter, the generated electromagnetic force is limited, and the technical difficulty of fixing the coil and the spring is high; secondly, the electromagnetic force direction generated by the vibration isolation system is always opposite to the vibration speed direction of the vibration source, namely only electromagnetic damping is generated to restrain the vibration of the vibration source, and a negative stiffness control strategy is not introduced.
The patent specification with the publication number of CN113446352A discloses a vibration isolation system and a vibration isolation process, the vibration isolation system comprises a shell, a thrust shaft is arranged on a vertical central shaft of the shell, an electromagnetic device is arranged below the thrust shaft, an armature is horizontally arranged at the center of the electromagnetic device, the armature is connected with a supporting rod, and the supporting rod is connected with a tray to provide supporting force for the tray. According to the scheme, vertical vibration of an object is restrained through the attraction force difference of electromagnets on the upper side and the lower side of the armature to the armature.
The vibration isolation system disclosed in this patent suffers from the following drawbacks: the control strategy of the system is that a differential current controller is connected with a power amplifier for adjusting coil current to adjust the attraction force of an electromagnet to an armatureEquivalent to introducing electromagnetic damping, but without introducing negative stiffness, i.e. it adopts a single variable damping strategy, under which, when f/f 0 When the vibration damping is less than or equal to 2, the larger the system damping is, the better the vibration isolation effect is, and the vibration transmissibility is more than 1; when f/f 0 The vibration isolation effect is better as the system damping is smaller and the vibration transmission rate is smaller than 1, namely the system can only reduce f/f by singly introducing electromagnetic damping 0 The vibration transmissibility is less than or equal to 2, but the transmissibility is still more than 1, and the frequency band of electromagnetic damping acting on vibration isolation efficiency is narrow. The invention can obtain the vibration isolation effect obviously superior to the patent by introducing electromagnetic damping and negative rigidity (relative to the positive rigidity of the vibration isolation element) and adopting a corresponding control strategy according to the vibration frequency of the vibration source.
Disclosure of Invention
The invention aims to provide a self-adaptive rigidity-variable damping-variable vibration isolator, which adopts the following formula 0 The related damping and rigidity intelligent control strategy can effectively control vibration with wide frequency band and wide dynamic load range, remarkably improve the vibration isolation performance of the traditional vibration isolation system and realize broadband vibration isolation.
An adaptive variable-rigidity variable-damping vibration isolator comprises a vibration isolation unit and an electromagnetic actuator unit; the vibration isolation unit comprises a base, vibration isolation elements and a load platform, wherein the vibration isolation elements are arranged on the base and used for supporting the load platform;
the electromagnetic actuator unit comprises a first electromagnet, a second electromagnet and a variable stiffness and damping control unit; the second electromagnet is arranged on the base, and the first electromagnet is positioned below the load platform and is arranged opposite to the second electromagnet;
the variable stiffness and damping control unit comprises a vibration sensor, a main control board and a current control module; the vibration sensor is fixed on the load platform, the main control board is respectively electrically connected with the vibration sensor and the current control module, the main control board obtains the vibration direction, exciting force and frequency information of the load platform through analyzing the vibration signals sensed by the vibration sensor, and determines the damping and rigidity control strategy of the vibration isolator, and the current control module adjusts the size and direction of the energizing current of the electromagnet according to the control strategy, so that the electromagnetic actuator unit generates the required damping force or equivalent negative rigidity, and the damping and rigidity self-adaptive adjustment of the vibration isolator is realized.
Preferably, the first electromagnet is fixedly connected with the load platform.
Further preferably, the vibration frequency f of the vibration source and the initial natural frequency f of the system are used 0 The following damping and stiffness control strategies were adopted:
when the vibration frequency f of the vibration source and the natural frequency f of the system 0 When the ratio is less than or equal to 1, the variable stiffness and variable damping control unit enables the electromagnetic force direction generated by the electromagnetic actuator unit to be opposite to the vibration direction of the vibration source, so that the system adaptively introduces the needed nonlinear electromagnetic damping, and the electromagnetic damping force counteracts the unbalanced force acting on the load platform; when 1 < f/f 0 When the rigidity is less than or equal to 2, the variable-rigidity variable-damping control unit enables the electromagnetic force direction generated by the electromagnetic actuator unit to be consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative rigidity, and the electromagnetic damping is zero at the moment, but the system has non-electromagnetic damping; when f/f 0 When >. V2, the variable stiffness variable damping control unit enables the electromagnetic force direction generated by the electromagnetic actuator unit to be consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative stiffness.
Preferably, the first electromagnet is fixedly connected with the base, the electromagnetic actuator unit further comprises an armature located between the first electromagnet and the second electromagnet, and the armature is arranged at the top of the vibration isolation element and fixedly connected with the load platform.
Further preferably, the vibration frequency f of the vibration source and the initial natural frequency f of the system are used 0 The following damping and stiffness control strategies were adopted:
when the vibration frequency f of the vibration source and the natural frequency f of the system 0 When the ratio is less than or equal to 1, the variable stiffness variable damping control unit enables the magnetic attraction direction of the electromagnet and the armature to be opposite to the vibration direction of the vibration source, so that the system adaptively introduces the needed nonlinear electromagnetic damping, and the electromagnetic damping force counteracts the unbalanced force acting on the load platform;when 1 < f/f 0 When the rigidity is less than or equal to 2, the rigidity-changing damping-changing control unit enables the magnetic attraction direction of the electromagnet and the armature to be consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative rigidity, and the electromagnetic damping is zero at the moment, but the system has non-electromagnetic damping; when f/f 0 When > < > v 2, the variable stiffness variable damping control unit enables the magnetic attraction direction of the electromagnet and the armature to be consistent with the vibration direction of the vibration source, and therefore the system adaptively introduces the required nonlinear negative stiffness.
Preferably, the number of electromagnets is one or more pairs, wherein one or more pairs of electromagnets are used for generating electromagnetic damping, and the other one or more pairs of electromagnets generate negative stiffness; or the same pair of electromagnets can generate the needed electromagnetic damping or negative rigidity according to the vibration frequency of the vibration source and the control strategy.
Preferably, the vibration isolation element is a steel spring, an air spring or a rubber vibration isolator.
Preferably, the vibration isolation element is provided with one or more.
The working principle of the self-adaptive rigidity-variable damping vibration isolator is as follows:
the main control board acquires information such as the vibration direction, exciting force and frequency (f) of a load platform in the vibration isolation unit by analyzing vibration signals sensed by the vibration sensor, determines a vibration isolator damping and stiffness control strategy, the current control module adjusts the size and direction of energizing current according to the control strategy, and the actuator generates required damping force or equivalent negative stiffness to realize vibration isolator damping and stiffness self-adaptive adjustment.
The variable stiffness and damping control unit is used for controlling the vibration frequency (exciting frequency) f of the vibration source and the initial natural frequency f of the system 0 The following damping and stiffness control strategies were adopted. When the excitation frequency f and the system natural frequency f 0 When the ratio is less than or equal to 1, the larger the system damping is, the tuning ratio f/f 0 The smaller vibration isolation effect is better, the variable stiffness and variable damping control unit enables the electromagnetic force direction generated by the actuator to be opposite to the vibration direction of the vibration source, and therefore the system adaptively introduces the needed nonlinear electromagnetic damping, so that the electromagnetic damping force counteracts the unbalanced force acting on the load platform as much as possible; when 1 < f/f 0 When the value is less than or equal to 2The greater the system damping, f/f 0 The larger vibration isolation effect is better, the variable stiffness and variable damping control unit enables the electromagnetic force direction generated by the actuator to be consistent with the vibration direction of the vibration source, and therefore the system adaptively introduces the required nonlinear negative stiffness, and the natural frequency f of the system is reduced 0 Indirectly increasing the tuning ratio f/f 0 Broadband vibration isolation is realized, electromagnetic damping is zero at the moment, but non-electromagnetic damping (such as viscous damping below a base and above a load platform in a vibration isolation unit) in the system is as large as possible; when f/f 0 When >. V2, the smaller the system damping, f/f 0 The larger the vibration isolation effect is, the better the variable stiffness and variable damping control unit enables the electromagnetic force direction generated by the actuator to be consistent with the vibration direction of the vibration source, therefore, the system adaptively introduces the required nonlinear negative stiffness, and the damping of the whole system is as small as possible.
The invention has the beneficial effects that:
(1) The invention introduces variable negative stiffness, couples with positive stiffness of the spring, and can realize variable system stiffness (realize quasi-zero stiffness), thereby changing the natural frequency f of the system 0 And indirectly regulate and control the tuning ratio (f/f 0 ) And wide-band vibration isolation is realized.
(2) The invention innovatively designs the self-adaptive variable-rigidity variable-damping vibration isolator, and can adaptively adjust a control strategy according to different tuning ratios and damping ratios, thereby greatly promoting the iterative upgrading of vibration isolation technology in the technical fields of electromechanical equipment and engineering.
Drawings
FIG. 1 is a schematic longitudinal section of example 1 of the present invention;
FIG. 2 is a schematic longitudinal section of example 2 of the present invention;
in the figure: 1. a vibration sensor; 2. a load platform; 3. a support post; 4. vibration isolation elements; 5. a first electromagnet; 6. a second electromagnet; 7. a base; 8. an armature; 9. a main control board; 10. and a current control module.
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.
Example 1
As shown in fig. 1, the self-adaptive variable stiffness and damping vibration isolator comprises a vibration isolation unit and an electromagnetic actuator unit; the vibration isolation unit comprises a base 7, a vibration isolation element 4 and a load platform 2, the electromagnetic actuator unit comprises a first electromagnet 5, a second electromagnet 6 and a variable-rigidity variable-damping control unit, and the variable-rigidity variable-damping control unit comprises a vibration sensor 1, a main control board 9 and a current control module 10.
The vibration isolation element 4 is connected with the load platform 2 and is connected with the base 7, in the embodiment, the vibration isolation element 4 is a steel spring, an air spring or a rubber vibration isolation pad, and four vibration isolation pads are arranged and are positioned at four corners of the base 7.
The first electromagnet 5 is connected with the load platform 2 through the support column 3, and the second electromagnet 6 is arranged on the base 7.
The main control board 9 obtains information such as the vibration direction, exciting force and frequency (f) of the load platform 2 in the vibration isolation unit by analyzing the vibration signal sensed by the vibration sensor 1, determines a vibration isolator damping and rigidity control strategy, and the current control module 10 adjusts the size and direction of the energizing current according to the control strategy, so that the electromagnet generates the required damping force or equivalent negative rigidity, and the vibration isolator damping and rigidity self-adaptive adjustment is realized.
The damping of the whole vibration isolation system comprises 2 parts, namely electromagnetic damping introduced by an electromagnetic actuator unit and non-electromagnetic damping such as viscous damping below a base and above a load platform in the vibration isolation unit.
The variable stiffness and damping control unit is used for controlling the vibration frequency (exciting frequency) f of the vibration source and the initial natural frequency f of the system 0 The following damping and stiffness control strategies were adopted. When the excitation frequency f and the system natural frequency f 0 When the ratio is less than or equal to 1, the variable stiffness and variable damping control unit enables the electromagnet to generate attractive force or repulsive force opposite to the vibration direction of the vibration source, so that the system adaptively introduces the needed nonlinear electromagnetic damping to enable the electromagnetic damping to be realizedThe damping force counteracts unbalanced forces acting on the load platform as much as possible; when 1 < f/f 0 When the vibration damping is less than or equal to 2, the variable stiffness and variable damping control unit enables the electromagnet to generate attractive force or repulsive force consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative stiffness, and the electromagnetic damping is zero at the moment, but the non-electromagnetic damping (such as viscous damping below a base and above a load platform in the vibration isolation unit) in the system is as large as possible; when f/f 0 When >. V2, the variable stiffness and damping control unit enables the electromagnet to generate attractive force or repulsive force consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative stiffness, and the damping of the whole system is as small as possible.
In the specific implementation process, the first electromagnet 5 and the second electromagnet 6 are both direct current electromagnets, the number of the electromagnets can be one or more pairs, wherein one or more pairs of electromagnets are used for generating electromagnetic damping, and the other one or more pairs of electromagnets generate negative rigidity, or the same pair of electromagnets can generate the required electromagnetic damping or negative rigidity according to the vibration frequency of a vibration source and a control strategy.
In a specific implementation, the electromagnet may be inside or outside the vibration isolation element 4.
Example 2
As shown in fig. 2, the self-adaptive variable stiffness and damping vibration isolator comprises a vibration isolation unit and an electromagnetic actuator unit; the vibration isolation unit comprises a base 7, a vibration isolation element 4 and a load platform 2, the electromagnetic actuator unit comprises a first electromagnet 5, a second electromagnet 6, an armature 8 and a variable-rigidity variable-damping control unit, and the variable-rigidity variable-damping control unit comprises a vibration sensor 1, a main control board 9 and a current control module 10.
The first electromagnet 5 is supported by a support column 3 connected with a base 7, the second electromagnet 6 is arranged on the base 7, and an armature 8 is arranged between the first electromagnet 5 and the second electromagnet 6 and is connected with the vibration isolation element 4 and the load platform 2.
The main control board 9 obtains information such as the vibration direction, exciting force and frequency (f) of the load platform 2 in the vibration isolation unit by analyzing the vibration signal sensed by the vibration sensor 1, determines a vibration isolator damping and stiffness control strategy, and the current control module 10 adjusts the electromagnet and the current to be electrified according to the control strategy, so that the electromagnet generates the required damping force or equivalent negative stiffness, and the vibration isolator damping and stiffness self-adaptive adjustment is realized.
The damping of the whole vibration isolation system comprises 2 parts, namely electromagnetic damping introduced by an electromagnetic actuator unit and non-electromagnetic damping such as viscous damping below a base and above a load platform in the vibration isolation unit.
The variable stiffness and damping control unit is used for controlling the vibration frequency (exciting frequency) f of the vibration source and the initial natural frequency f of the system 0 The following damping and stiffness control strategies were adopted. When the excitation frequency f and the system natural frequency f 0 When the ratio is less than or equal to 1, the variable stiffness and variable damping control unit enables the magnetic attraction direction of the electromagnet and the armature to be opposite to the vibration direction of the vibration source, so that the system adaptively introduces the needed nonlinear electromagnetic damping, and the electromagnetic damping force counteracts the unbalanced force acting on the load platform as much as possible; when 1 < f/f 0 When the rigidity and damping change control unit is less than or equal to 2, the magnetic attraction direction of the electromagnet and the armature is consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative rigidity, the electromagnetic damping is zero, but the non-electromagnetic damping (such as viscous damping below a base and above a load platform in the vibration isolation unit) in the system is as large as possible; when f/f 0 When > < > v 2, the variable stiffness and variable damping control unit enables the magnetic attraction direction of the electromagnet and the armature to be consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative stiffness, and the damping of the whole system is as small as possible.
In a specific implementation process, the first electromagnet 5 and the second electromagnet 6 may be direct current electromagnets or alternating current electromagnets, and the number of the electromagnets may be one or more pairs, where one or more pairs of electromagnets are used to generate electromagnetic damping, and the other one or more pairs of electromagnets generate negative stiffness, or the same pair of electromagnets may generate required electromagnetic damping or negative stiffness according to vibration frequency of a vibration source and a control strategy.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims (8)

1. The self-adaptive rigidity-changing damping-changing vibration isolator is characterized by comprising a vibration isolating unit and an electromagnetic actuator unit; the vibration isolation unit comprises a base, vibration isolation elements and a load platform, wherein the vibration isolation elements are arranged on the base and used for supporting the load platform;
the electromagnetic actuator unit comprises a first electromagnet, a second electromagnet and a variable stiffness and damping control unit; the second electromagnet is arranged on the base, and the first electromagnet is positioned below the load platform and is arranged opposite to the second electromagnet;
the variable stiffness and damping control unit comprises a vibration sensor, a main control board and a current control module; the vibration sensor is fixed on the load platform, the main control board is respectively electrically connected with the vibration sensor and the current control module, the main control board obtains the vibration direction, exciting force and frequency information of the load platform through analyzing the vibration signals sensed by the vibration sensor, and determines the damping and rigidity control strategy of the vibration isolator, and the current control module adjusts the size and direction of the energizing current of the electromagnet according to the control strategy, so that the electromagnetic actuator unit generates the required damping force or equivalent negative rigidity, and the damping and rigidity self-adaptive adjustment of the vibration isolator is realized.
2. The adaptive variable stiffness and damping vibration isolator of claim 1, wherein the first electromagnet is fixedly coupled to the load platform.
3. The self-adaptive variable stiffness and variable damping vibration isolator according to claim 2, wherein the vibration frequency f of the vibration source and the initial natural frequency f of the system are used as the vibration source 0 The following damping and stiffness control strategies were adopted:
when the vibration frequency f of the vibration sourceNatural frequency f of system 0 When the ratio is less than or equal to 1, the variable stiffness and variable damping control unit enables the electromagnetic force direction generated by the electromagnetic actuator unit to be opposite to the vibration direction of the vibration source, so that the system adaptively introduces the needed nonlinear electromagnetic damping, and the electromagnetic damping force counteracts the unbalanced force acting on the load platform; when 1 < f/f 0 When the rigidity is less than or equal to 2, the variable-rigidity variable-damping control unit enables the electromagnetic force direction generated by the electromagnetic actuator unit to be consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative rigidity, and the electromagnetic damping is zero at the moment, but the system has non-electromagnetic damping; when f/f 0 When >. V2, the variable stiffness variable damping control unit enables the electromagnetic force direction generated by the electromagnetic actuator unit to be consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative stiffness.
4. The adaptive variable stiffness and damping vibration isolator according to claim 1, wherein the first electromagnet is fixedly connected to the base, the electromagnetic actuator unit further comprises an armature positioned between the first electromagnet and the second electromagnet, the armature being disposed on top of the vibration isolation element and fixedly connected to the load platform.
5. The self-adaptive variable stiffness and variable damping vibration isolator according to claim 4, wherein the vibration frequency f of the vibration source and the initial natural frequency f of the system are used as the vibration source 0 The following damping and stiffness control strategies were adopted:
when the vibration frequency f of the vibration source and the natural frequency f of the system 0 When the ratio is less than or equal to 1, the variable stiffness variable damping control unit enables the magnetic attraction direction of the electromagnet and the armature to be opposite to the vibration direction of the vibration source, so that the system adaptively introduces the needed nonlinear electromagnetic damping, and the electromagnetic damping force counteracts the unbalanced force acting on the load platform; when 1 < f/f 0 When the rigidity is less than or equal to 2, the rigidity-changing damping-changing control unit enables the magnetic attraction direction of the electromagnet and the armature to be consistent with the vibration direction of the vibration source, so that the system adaptively introduces the required nonlinear negative rigidity, and the electromagnetic damping is zero at the moment, but the system has non-electromagnetic damping; when f/f 0 When > [ v ] 2, the variable stiffness and the variable dampingThe control unit enables the magnetic attraction direction of the electromagnet and the armature to be consistent with the vibration direction of the vibration source, and therefore the system adaptively introduces the required nonlinear negative stiffness.
6. The adaptive variable stiffness and damping vibration isolator according to claim 1, wherein the number of electromagnets is one or more pairs, wherein one or more pairs of electromagnets are used to produce electromagnetic damping and the other one or more pairs of electromagnets produce negative stiffness; or the same pair of electromagnets can generate the needed electromagnetic damping or negative rigidity according to the vibration frequency of the vibration source and the control strategy.
7. The adaptive variable stiffness and damping vibration isolator of claim 1, wherein the vibration isolation element is a steel spring, an air spring, or a rubber vibration isolator.
8. The adaptive variable stiffness and damping vibration isolator according to claim 1, wherein the vibration isolation element is provided with one or more.
CN202310321543.2A 2023-03-29 2023-03-29 Self-adaptive rigidity-variable damping vibration isolator Pending CN116592078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310321543.2A CN116592078A (en) 2023-03-29 2023-03-29 Self-adaptive rigidity-variable damping vibration isolator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310321543.2A CN116592078A (en) 2023-03-29 2023-03-29 Self-adaptive rigidity-variable damping vibration isolator

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CN116592078A true CN116592078A (en) 2023-08-15

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