CN116972107A - Multimode vibration suppression device and method - Google Patents

Multimode vibration suppression device and method Download PDF

Info

Publication number
CN116972107A
CN116972107A CN202311084936.2A CN202311084936A CN116972107A CN 116972107 A CN116972107 A CN 116972107A CN 202311084936 A CN202311084936 A CN 202311084936A CN 116972107 A CN116972107 A CN 116972107A
Authority
CN
China
Prior art keywords
vibration
piezoelectric
shunt circuit
modal
additional mass
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
CN202311084936.2A
Other languages
Chinese (zh)
Inventor
郭志巍
刘璞
盛美萍
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Research Institute of Northwestern Polytechnical University
Original Assignee
Ningbo Research Institute of Northwestern Polytechnical University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ningbo Research Institute of Northwestern Polytechnical University filed Critical Ningbo Research Institute of Northwestern Polytechnical University
Priority to CN202311084936.2A priority Critical patent/CN116972107A/en
Publication of CN116972107A publication Critical patent/CN116972107A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • 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
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems

Landscapes

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

Abstract

The application discloses a multimode vibration suppression device and a multimode vibration suppression method, wherein the device comprises: the bottom end of the elastic column is connected with the vibration structure; the additional mass block is arranged at the top end of the elastic column, and the elastic column and the additional mass block are used for inhibiting lower frequency in the multi-mode vibration frequency generated by the vibration structure; a piezoelectric unit for being disposed on the vibration structure; and the piezoelectric shunt circuit is electrically connected with the piezoelectric unit and is used for inhibiting higher frequency in the multi-mode vibration frequency generated by the vibration structure. The piezoelectric vibration absorber adopts an electromechanical combination mode, solves the problems that the geometrical size and the additional mass of the piezoelectric vibration absorber are too large and the structure is too complex due to the fact that the dynamic vibration absorber controls the multi-mode vibration, and simultaneously avoids the problem that a shunt circuit is too complex due to the fact that the piezoelectric shunt controls the multi-mode vibration.

Description

Multimode vibration suppression device and method
Technical Field
The application relates to the technical field of vibration control, in particular to a multi-mode vibration suppression device and method.
Background
Vibration is a common physical phenomenon, and in some situations vibration is detrimental, causing a series of adverse effects such as noise, looseness, and increased wear, and therefore vibration needs to be suppressed in these situations.
A common vibration suppression mode can transfer mechanical energy of structural vibration to a dynamic vibration absorber through resonance, so that the purpose of suppressing the structural vibration is achieved. If the dynamic vibration absorber is adopted to simultaneously inhibit a plurality of modal frequencies of the controlled structure, the mass of the dynamic vibration absorber is necessarily larger, and the mass of the dynamic vibration absorber in partial scenes can reach 10% -20% of the mass of the main vibration system, so that the further application of the dynamic vibration absorber in engineering practice is severely limited. The piezoelectric shunt technology can greatly reduce the additional mass, and the piezoelectric shunt technology converts mechanical energy of structural vibration into electric energy by utilizing the piezoelectric effect of piezoelectric materials, and then stores or dissipates the electric energy through an external circuit, so that the purpose of transferring and consuming the structural vibration energy is achieved. However, if the multi-mode frequency of the controlled structure is suppressed by the piezoelectric shunt technology, a more complex shunt circuit is required to be added, which also limits the application field of the piezoelectric shunt technology in engineering practice.
Disclosure of Invention
The embodiment of the application provides a multi-mode vibration suppression device and a multi-mode vibration suppression method, which are used for solving the problem that in the prior art, a single dynamic vibration absorber or a single piezoelectric shunt is difficult to realize in multi-mode frequency suppression of structural vibration.
In one aspect, an embodiment of the present application provides a multi-modal vibration suppression apparatus, including:
the bottom end of the elastic column is connected with the vibration structure;
the additional mass block is arranged at the top end of the elastic column, and the elastic column and the additional mass block are used for inhibiting lower frequency in the multi-mode vibration frequency generated by the vibration structure;
a piezoelectric unit for being disposed on the vibration structure;
and the piezoelectric shunt circuit is electrically connected with the piezoelectric unit and is used for inhibiting higher frequency in the multi-mode vibration frequency generated by the vibration structure.
On the other hand, the embodiment of the application also provides a multi-mode vibration suppression method, which comprises the following steps:
analyzing the vibration spectrum of the vibration structure to determine two modal frequencies;
selecting an additional mass block matched with the lower frequency of the two modal frequencies, arranging the additional mass block at the top end of the elastic column, and connecting the bottom end of the elastic column with the vibration structure;
determining the resistance value of a resistance module and the inductance value of an inductance module in the piezoelectric shunt circuit according to the higher frequency of the two modal frequencies;
and a piezoelectric unit is arranged on the vibration structure, and the piezoelectric unit, the resistance module and the inductance module are sequentially connected in series.
The multi-mode vibration suppression device and method provided by the application have the following advantages:
the electromechanical combination mode is adopted, so that the problems of overlarge geometric dimension and additional mass and overlarge structure caused by controlling the multi-mode vibration by the dynamic vibration absorber are solved, and meanwhile, the problem of overlarge shunt circuit caused by controlling the multi-mode vibration by piezoelectric shunt is also avoided.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multi-mode vibration suppression device according to an embodiment of the present application in a mounted state on a vibration structure;
FIG. 2 is a schematic diagram of a periodic arrangement of a multi-modal vibration suppression device on a vibration structure according to an embodiment of the present application;
FIG. 3 is a graph showing the comparison of the excited vibration response of the multi-modal vibration suppression device provided by the present application before and after mounting on a homogeneous sheet.
Reference numerals illustrate: 1-vibration structure, 2-elastic column, 3-piezoelectric unit, 4-shunt circuit box, 41-resistance module, 42-inductance module, 5-additional mass block, 51-installation pole.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a schematic structural diagram of a multi-mode vibration suppression device according to an embodiment of the present application. The embodiment of the application provides a multi-mode vibration suppression device, which comprises:
the bottom end of the elastic column 2 is connected with the vibration structure 1;
the additional mass block 5 is arranged at the top end of the elastic column 2, and the elastic column 2 and the additional mass block 5 are used for suppressing lower frequency in the multi-mode vibration frequency generated by the vibration structure 1;
a piezoelectric unit 3 for being disposed on the vibrating structure 1;
and the piezoelectric shunt circuit is electrically connected with the piezoelectric unit 3, and the piezoelectric unit 3 and the piezoelectric shunt circuit are used for suppressing higher frequency in the multi-mode vibration frequency generated by the vibration structure 1.
Illustratively, the elastic column 2 may employ one or a combination of several viscoelastic materials such as rubber, foam, sponge, etc. The elastic column 2 and the piezoelectric unit 3 can be directly adhered to the surface of the vibration structure 1, and specifically can be adhered and connected by glue or epoxy resin.
In the embodiment of the present application, the elastic columns 2 and the piezoelectric units 3 need to be disposed in the same area on the surface of the vibrating structure 1, and the area should be small, that is, the distance between the elastic columns 2 and the piezoelectric units 3 should be small, so that the vibration of the multi-modal frequencies can be suppressed at two positions where the distance of the vibrating structure 1 is small.
After the multi-mode frequency of the vibration structure 1 is determined, the index value of the electronic device in the corresponding piezoelectric shunt circuit can be determined according to the higher frequency in the multi-mode frequency, and then the electronic device matched with the index value and the piezoelectric unit are connected in series, so that a complete piezoelectric shunt circuit can be formed. When the piezoelectric shunt vibration suppression technology is utilized, the mechanical energy of vibration of the vibration structure 1 is converted into electric energy through the piezoelectric effect of the piezoelectric unit 3, and then the electric energy is converted into heat energy through the piezoelectric shunt circuit for dissipation, so that the effects of consuming vibration energy and suppressing vibration are achieved.
In one possible embodiment, the piezoelectric shunt circuit is provided in the shunt circuit box 4.
The piezoelectric shunt circuit may be provided on a PCB circuit board, which may be mounted in the shunt circuit case 4 by screws or a card slot, for example. Further, the shunt circuit case 4 may be made of plastic, and two through holes for passing through the leads led out from the piezoelectric unit 3 are required to be provided on the bottom surface thereof.
In an embodiment of the application, the shunt circuit case 4 may be provided at the top end of the elastic column 2, and the additional mass 5 is provided on the top surface of the shunt circuit case 4. The shunt circuit box 4 and the additional mass block 5 are arranged at the top end of the elastic column 2, so that the shunt circuit box 4 and the internal PCB circuit board can also be used as a part of the mechanical dynamic vibration absorber, and form a mass part of the dynamic vibration absorber together with the additional mass block 5, and the volume and the mass of the additional mass block 5 can be reduced. Meanwhile, the elastic column 2 and the shunt circuit box 4 can be connected together in a pasting mode, and particularly can be connected by glue or epoxy resin pasting.
In one possible embodiment, the additional mass 5 is arranged on the top surface of the shunt circuit box 4 by means of a mounting bar 51.
Illustratively, the mounting rod 51 may be a screw or a polished rod. When a screw is adopted, a screw hole matched with the screw is formed in the additional mass block 5, and the additional mass block 5 is screwed on the mounting rod 51.
Whether the mounting rod 51 is a screw rod or a polished rod, a screw hole is required to be formed in the top surface of the shunt circuit box 4, and a thread matched with the screw hole is provided at the bottom end of the side surface of the mounting rod 51 so as to connect the mounting rod 51 to the shunt circuit box 4 in a threaded manner. The mounting rod 51 can be conveniently dismounted by screwing, and the mounting rod 51 is connected with the additional mass block 5, so that the additional mass block 5 with different masses can be replaced quickly, and the purpose that the additional mass is matched with the modal frequency of the vibration structure 1 is achieved.
In one possible embodiment, the piezoelectric shunt circuit includes a resistive module 41 and an inductive module 42 in series.
Illustratively, the inductance module 42 is an artificial inductance, which includes a capacitor, a resistor and a bipolar operational amplifier connected in series, and in this analog manner, an equivalent inductance with a larger inductance value can be obtained, so as to solve the problem that the inductance value of the piezoelectric shunt circuit is required to be too large when controlling low-frequency vibration.
The principle of suppressing the vibration of the vibration structure 1 by adjusting the shunt circuit parameters will be described below by taking the piezoelectric shunt circuit formed by connecting the resistor module 41 and the inductor module 42 in series as an example.
The positive and negative electrodes of the piezoelectric unit 3 are connected into a piezoelectric shunt circuit to form a loop, and the resonant frequency of the circuit isWherein: l (L) eq For the inductance value, C, of the inductance module 42 p Is the capacitance value of the piezoelectric unit 3. The electromechanical coupling coefficient +.>Wherein: omega K And omega S The modal frequencies of the piezoelectric shunt circuit at the time of open circuit and short circuit are respectively. The optimum resistance value of the resistor module 41 is +.>The optimal inductance value of the inductance module 42 is +.>Wherein: omega 0 The modal frequencies that need to be suppressed for the piezoelectric shunt circuit.
Further, in order to make the resistance value of the resistance module 41 and the inductance value of the inductance module 42 reach the above-mentioned optimal values, the resistance and the resistance module 41 are both adjustable potentiometers. The resistance value of the adjustable potentiometer can be correspondingly changed by adjusting the knob of the adjustable potentiometer, so that the resistance value of the resistor module 41 and the resistance can meet the requirement, and the effect of matching the piezoelectric shunt circuit and the modal frequency can be achieved.
The embodiment of the application also provides a multi-mode vibration suppression method, which comprises the following steps:
analyzing the vibration spectrum of the vibration structure 1 to determine two modal frequencies;
selecting an additional mass block 5 matched with the lower frequency of the two modal frequencies, arranging the additional mass block 5 at the top end of the elastic column 2, and connecting the bottom end of the elastic column 2 with the vibration structure 1;
determining the resistance value of the resistance module 41 and the inductance value of the inductance module 42 in the piezoelectric shunt circuit according to the higher frequency of the two modal frequencies;
the piezoelectric unit 3 is provided on the vibrating structure 1, and the piezoelectric unit 3, the resistor module 41, and the inductor module 42 are sequentially connected in series.
Further, the additional mass block 5, the elastic column 2, the piezoelectric unit 3 and the piezoelectric shunt circuit form a multi-mode vibration suppression device, and a plurality of multi-mode vibration suppression devices are arranged on the vibration structure 1 according to a set period.
As shown in fig. 2, by arranging the multi-mode vibration suppression device according to a specific period, the periodic structure exhibits a band gap filter characteristic, that is, vibration waves outside a band gap frequency range can normally propagate, but vibration waves within the band gap frequency range cannot freely propagate, and are significantly suppressed. According to the application, the multimode vibration suppression device is periodically arranged on the vibration structure 1, so that the vibration suppression performance can be further enhanced, a plurality of modal band gaps are generated, and broadband vibration suppression is realized.
Fig. 3 shows the response of vibration before and after the multi-modal vibration suppression device of the present application is mounted on a homogeneous sheet, and it can be seen that vibration is significantly suppressed by the multi-modal vibration suppression device of the present application.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A multi-modal vibration suppression device, comprising:
the bottom end of the elastic column (2) is connected with the vibration structure (1);
the additional mass block (5) is arranged at the top end of the elastic column (2), and the elastic column (2) and the additional mass block (5) are used for suppressing lower frequencies in the multi-mode vibration frequency generated by the vibration structure (1);
a piezoelectric unit (3) for being arranged on the vibrating structure (1);
and the piezoelectric shunt circuit is electrically connected with the piezoelectric unit (3), and the piezoelectric unit (3) and the piezoelectric shunt circuit are used for inhibiting higher frequency in the multi-mode vibration frequency generated by the vibration structure (1).
2. A multi-modal vibration suppression device according to claim 1, characterized in that the piezoelectric shunt circuit is provided in a shunt circuit box (4).
3. A multi-modal vibration suppression device according to claim 2, characterized in that the shunt circuit box (4) is arranged at the top end of the spring post (2), the additional mass (5) being arranged on the top surface of the shunt circuit box (4).
4. A multi-modal vibration suppression device according to claim 3, characterized in that the additional mass (5) is arranged on the top surface of the shunt circuit box (4) by means of a mounting bar (51).
5. A multi-modal vibration suppression device according to claim 4, characterized in that the mounting rod (51) is a screw, the additional mass (5) is provided with a screw hole matching the screw, and the additional mass (5) is screwed onto the mounting rod (51).
6. A multi-modal vibration suppression device according to claim 1, characterized in that the piezoelectric shunt circuit comprises a resistive module (41) and an inductive module (42) in series.
7. A multi-modal vibration suppression device according to claim 6, characterized in that the inductance module (42) includes a series connection of a capacitor, a resistor and a bipolar operational amplifier.
8. A multi-modal vibration suppression device according to claim 7, characterized in that the resistor and resistor module (41) each employ an adjustable potentiometer.
9. A multi-modal vibration suppression method, comprising:
analyzing the vibration spectrum of the vibration structure (1) to determine two modal frequencies;
selecting an additional mass block (5) matched with the lower frequency of the two modal frequencies, arranging the additional mass block (5) at the top end of an elastic column (2), and connecting the bottom end of the elastic column (2) with a vibration structure (1);
determining the resistance value of a resistance module (41) and the inductance value of an inductance module (42) in the piezoelectric shunt circuit according to the higher frequency of the two modal frequencies;
a piezoelectric unit (3) is arranged on a vibration structure (1), and the piezoelectric unit (3), a resistance module (41) and an inductance module (42) are sequentially connected in series.
10. A multi-modal vibration suppression method according to claim 9, characterized in that the additional mass (5), the elastic column (2), the piezoelectric unit (3) and the piezoelectric shunt circuit constitute a multi-modal vibration suppression device, a plurality of which are arranged on the vibration structure (1) according to a set period.
CN202311084936.2A 2023-08-25 2023-08-25 Multimode vibration suppression device and method Pending CN116972107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311084936.2A CN116972107A (en) 2023-08-25 2023-08-25 Multimode vibration suppression device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311084936.2A CN116972107A (en) 2023-08-25 2023-08-25 Multimode vibration suppression device and method

Publications (1)

Publication Number Publication Date
CN116972107A true CN116972107A (en) 2023-10-31

Family

ID=88473148

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311084936.2A Pending CN116972107A (en) 2023-08-25 2023-08-25 Multimode vibration suppression device and method

Country Status (1)

Country Link
CN (1) CN116972107A (en)

Similar Documents

Publication Publication Date Title
US7080849B2 (en) Ski, method of stiffening the ski and method of manufacturing the ski
US4750397A (en) Electronic musical instrument with elastomeric strings and shielded bimorphic transducers
US6193032B1 (en) Piezoceramic vibration control device and tuning control thereof
CN104218914A (en) Piezoelectric resonators for reduction of noise and vibration in vehicle components
US9240174B2 (en) Electric stringed musical instrument and method of designing the same
US9117430B2 (en) Electric stringed musical instrument and method of designing the same
US20210088104A1 (en) Self-powered vibration damper based on piezoelectricity and control method thereof
CN1198390C (en) Method for manufacturing piezoelectric resonator
CN103905697B (en) Dual shot device
CN108988684A (en) A kind of absorbing and vibrational energy acquire integrated apparatus
CN220581589U (en) Multimode vibration suppression device
Sun et al. Vibration suppression of a hard disk driver actuator arm using piezoelectric shunt damping with a topology-optimized PZT transducer
CN116972107A (en) Multimode vibration suppression device and method
CN209313876U (en) Mobile terminal
US20180202512A1 (en) Vibratory structure
CN205918824U (en) Mechanical damping and piezoelectricity reposition of redundant personnel damping joint control device
WO2020072056A1 (en) Piezoelectric resonant shunt damping for phase noise reduction
CN1078404C (en) Electronic element and ladder type filter
US8861219B2 (en) Printed circuit board for providing operation voltages
JP2008172798A (en) Semiconductor device and signal terminating method thereof
CN208940214U (en) A kind of Chinese zither electromagnetic pick-up
CN107732390B (en) A kind of electromagnetism hybrid coupled cavity body filter
CN213303899U (en) Capacitor convenient to connect
CN109275066A (en) A kind of Chinese zither electromagnetic pick-up
Kodejška et al. A system for the vibration suppression in the broad frequency range using a single piezoelectric actuator shunted by a negative capacitor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination