CN102996706A - Piezoelectric-dry friction composite damping device - Google Patents

Piezoelectric-dry friction composite damping device Download PDF

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CN102996706A
CN102996706A CN2012104887848A CN201210488784A CN102996706A CN 102996706 A CN102996706 A CN 102996706A CN 2012104887848 A CN2012104887848 A CN 2012104887848A CN 201210488784 A CN201210488784 A CN 201210488784A CN 102996706 A CN102996706 A CN 102996706A
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damping
dry
friction
piezo
piezoelectric
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CN102996706B (en
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范雨
李琳
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Beihang University
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Beihang University
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Abstract

The invention discloses a piezoelectric-dry friction composite damping device, and belongs to the technical field of rotary machinery vibration and noise suppression. The piezoelectric-dry friction composite damping device comprises a dry-friction damping part, a piezoelectric damping part and a limiting part, wherein the piezoelectric damping part is fixed at the inner side of the dry-friction damping part; and the dry-friction damping part is fixed on a damping object through the limiting part; the dry-friction damping part is in a damping ring/sleeve structure which has an opening structure having a flanging, and a weight is arranged on a position opposite to the opening; a piezoelectric plate mounting platform is arranged on the inner surface of the damping ring/sleeve; and the piezoelectric damping part is composed of distributed piezoelectric plates and circuits which are respectively connected with the piezoelectric plates. The piezoelectric-dry friction composite damping device disclosed by the invention is relatively compact in damper design while functions are not influenced, and improves the damping effect of the damper, enhances reliability of the damper, simplifies installation and disassembly of the piezoelectric damper, and widens the designed damping range of the damper.

Description

Piezoelectricity-dry friction composite damping device
Technical field
The present invention relates to a kind of vibration damping equipment that piezo-electric damping and dry-friction damping can be provided simultaneously, described vibration damping equipment is ring or the sleeve with opening and counterweight, is furnished with piezoelectric material and circuit on it, belongs to rotating machinery vibrating and noise reduction techniques field.
Background technique
Rotating machinery is the class core component in Aeronautics and Astronautics, the energy, power and mechanical engineering, such as the leaf dish structure in the aeroengine, the turbine rotor in the Surface power drive machinery, the various gear in the gearing etc.The development of modern industry to all kinds of motive power machine devices all proposed at a high speed, the requirement of heavy duty, light weight aspect, this is so that the vibration problem of this class core component becomes becomes increasingly conspicuous.Because this base part is High Rotation Speed when work, excitation force is complicated, thereby be not that the vibration reducing measure of all possible in theory can both be used: comparatively tradition and common be dry friction damping technology, squeeze film damping technology etc., emerging still be in academic development piezo-electric damping technology etc. arranged.
(1) dry friction damping technology
Dry friction refers between object or the friction when not adding any oiling agent between sample.Usually, in structural system, introduce the dry friction element, and under suitable design parameter so that frictional interface produces relative slippage, can produce the vibrational energy of damping consumption systems, suppress the level of vibration of structure, this method is widely used in the vibration damping of rotating machinery.
Particularly, the dry friction vibration damping equipment (damper) that is implemented in engineering has: be used for the damping ring, uniform thickness damped sleeve, finger-like damped sleeve of thin-shell construction etc.; The listrium damping block of commonly using on the aeroengine wheel disc and blade convex shoulder etc.The advantage of dry damping device is to realize simply, reliable performance, and vibration suppressioning effect is obvious etc.
In vibration engineering, often weigh the vibration suppressioning effect of damped system according to the response amplification factor of system in resonance bands (being the steady-state response amplitude and the ratio of quiet distortion).Yet because the non-linear nature of dry friction phenomenon, its vibration suppressioning effect directly is subjected to the impact of amplitude of exciting force.That is, in case the positive pressure on the rubbing surface is determined (by the magnitude of interference of damping member, opening amount, the design parameter determinations such as working speed), it is best that its vibration suppressioning effect only reaches at some excitation force levels place.When actual excitation force is less than or greater than this optimum value, its vibration suppressioning effect will weaken rapidly, even can't produce dry-friction damping, referring to reference [1]: Li Lin, model rain, Dai Guanghao. two degrees of freedom is reversed the strip method method [J] of dry friction system. aviation power journal, 2012 (11).Although these characteristics can be improved by introducing a plurality of dry friction elements with different designs parameter, but increased to a certain extent design difficulty and the complexity of system, the application (such as the leaf dish structure of aeroengine) that does not possess adequate space for some also is unpractical.
(2) piezo-electric vibration reduction technology
Structure in vibration arranges piezoelectric layer/sheet, and lays electrode at piezoelectric material, connects the circuit with inductance, electric capacity, resistance (or their combination) at the electrode two ends, can consist of the piezoelectric shunt damping system.The vibration attenuation mechanism of this system is: the bi-directional electromechanical coupled characteristic that utilizes piezoelectric material, the vibrational energy of mechanical field is converted to electric energy, and utilize the component with dissipation characteristic that this electric energy that converts is carried out loss, thereby reach the purpose that reduces system vibration energy and level of vibration.Particularly, the electric capacity in the branch circuit will affect the rigidity of original structure; Resistance will increase the damping of original structure; Inductance will affect the inertia of original structure; Electric capacity-inductance-resistance will consist of one " electric bump leveller ", referring to reference [2]: model rain, based on the self energizing Vibration Suppression System [D] of piezoelectric material, BJ University of Aeronautics ﹠ Astronautics's academic dissertation, 2012.
The advantage of piezoelectric shunt damping is to be easy to realize that equipment is light that there are not the problems such as wearing and tearing in wide adaptability.What is more important, piezoelectric shunt damping are class linear dampings.According to vibrational theory, be linear damping (modal be directly proportional with relative velocity such as damping force) if the damping of system is set behind the damper, then the suffered excitation force size of the vibration suppressioning effect of system and system is irrelevant.Owing to above-mentioned character, in the design of piezoelectric shunt damping device, can not pay close attention to the excitation force level of structure real work.This is that the piezoelectric shunt damping device is compared to a large advantage of dry damping device.
In order to utilize better the electromechanical coupling characteristics of piezoelectric material, promote its vibration suppressioning effect, can also adopt the piezoelectricity network technique (referring to reference [3]: Tang J., Wang K.W., Vibration Confinement via OptimalEigenvector Assignment and Piezoelectric Networks, Journal of Vibration andAcoustics, vol.126, pp.27-36. and reference [4]: Fan Y., Li L., Vibration DissipationCharacteristics of Symmetrical Piezoelectric Networks with Passive Branches.ASME paper GT2012-69208).The piezoelectric material that be about to be used for vibration damping is discrete periodically respectively to vibrate the deathtrap to the original structure system, and with circuit these piezoelectric materials are linked together, like this, just constructed the energy bang path of new " a machinery-circuit-machinery ", by the parameter of reasonable design piezoelectricity network, just can reach the purpose of vibration suppression.Theory analysis verified (reference [3], [4]): the optimal damping effect of piezoelectricity network will be much better than the optimum efficiency of piezoelectric shunt damping technology.
On the other hand, the piezo-electric vibration reduction technology also has the deficiency of self, mainly from:
1. the character of piezoelectric material itself.The most frequently used piezoelectric material, such as lead zirconate-titanate ceramic (PZT), its material behavior has been brought some restrictions to its application: at first, piezoelectric constant is frangible, and this not only causes it can't be processed into complicated shape, is more restricting the reliability of piezo-electric damping device; Secondly, Young's modulus little (suitable with aluminium), this causes for the larger vibrational structure of some rigidity, arranges that thereon the mechanical-electric coupling efficient of piezoelectric layer is not high, thereby is restricting its damping.
2. the Placement of original structure and piezoelectric structure.Usually, piezoelectric material needs to couple together with solid gum and original structure, and often needs to lay some circuit.And usually in the design of original structure (structure that vibration problem namely occurs) not the layout of promising piezoelectric material consider the position, even need the structure of vibration damping itself to place oneself in the midst of in the large system, can't dismantle the laying of carrying out piezoelectric layer.On the other hand, because piezoelectric constant is frangible, in case its inefficacy just need to be changed, mode direct and that original structure is bonding also is to be unfavorable for carrying out changeing of piezoelectric material.
Summary of the invention
The objective of the invention is provides more stable effective damping for the vibration suppression to rotating machinery, a kind of piezoelectricity-dry friction composite damping device is proposed, its citation form is ring or the sleeve with piezoelectric material and adjunct circuit thereof, generally is applicable to have the damper mechanism of the shell structures such as wheel rim of rotating machinery.
Piezoelectricity provided by the invention-dry friction composite damping device, comprise dry-friction damping parts 1, piezo-electric damping parts 2 and limit position part 3, described piezo-electric damping parts 2 are fixed on the inboard of dry-friction damping parts 1, and dry-friction damping parts 1 are fixed on the vibration damping object 4 by limit position part 3.
Described dry-friction damping parts are damping ring/tube-in-tube structure, and described damping ring/tube-in-tube structure setting has the hatch frame of flange, and the position relative with opening arranges counterweight; Be provided with the mountion plate of piezo-electric sheet at the internal surface of described damping ring/sleeve.
The quantity of described mountion plate equals the quantity of piezo-electric sheet, and the quantity of piezo-electric sheet equals the vibration cycle of vibration damping object.Described mountion plate is positioned at each local strain extreme value place of corresponding vibration damping object on damping ring/sleeve.
Described limit position part has sector structure, and the cross section is L-type, when the inner surface of L-type is installed and gapped between the dry-friction damping parts.
The invention has the advantages that:
(1) when not affecting function, damper designs is compacter.Do not produce the joint area piezoelectric material of dry friction at damping member, and piezoelectric material is attached on dry friction element rather than the original structure, like this so that the space availability ratio of damping ring is higher, design compactlyer, do not affect two kinds of damping principle effects separately simultaneously;
(2) promoted the effectiveness in vibration suppression of damper.During independent role, the effect of dry-friction damping and piezo-electric damping has the limit separately, dry-friction damping is subject to the quality that can't increase without end damper, and piezo-electric damping is subject to the rigidity of its electromechanical coupling factor and piezoelectric material and the ratio of rigidity of mechanical material.Like this, when the two worked simultaneously, the damping superposition that produces separately got up, and is good in the time of can be than individualism separately.Like this, just promoted further the optimal vibration inhibition that damper can reach;
(3) increased the reliability of damper.If the Dry Sliding Friction and Wear Characteristics of damping ring lost efficacy (such as pressing too tightly or little than design of excitation force), piezo-electric damping also can play a role; If the piezoelectricity network partly or entirely lost efficacy (this also is piezo-electric damping is queried at most a bit), dry damping device also can play a role.Say addition from the reliability of system with complementation;
(4) installation and removal of piezo-electric damping have been simplified.Piezoelectric material is arranged on the damping ring, and is simpler than being attached directly on the original structure, can make separately elsewhere because contain the damping ring of piezoelectric material, and the layout of circuit and component can be carried out in advance.If piezo-electric damping lost efficacy, what change is a damping member, rather than goes original structure again to dismantle and arrange piezoelectric material.This advantage and no longer is traditional direct bonding method so that piezo-electric damping also can be used as in a kind of " damping member " introducing equipment of removable, independent design;
(5) widen the design vibration damping scope of damper.This is a system that has simultaneously linear damping and nonlinear dampling, in design, there is complementary relationship, because piezo-electric damping is irrelevant with the excitation force level, can the vibration suppressioning effect of all excitation force levels be improved in case introduced piezo-electric damping, and nonlinear dry-friction damping can be designed to emphatically some excitation force scopes be carried out vibration suppression.The two combination both can have the effect of widening to the vibration damping scope of system, again specific excitation force level was had stronger vibration suppressioning effect.
Description of drawings
Fig. 1 is the circumferential assembly relation schematic representation of composite damping device of the present invention; Dry friction occurs in the arc lines that overstriking represents among the surface of contact 5(of dry-friction damping parts 1 and vibration damping object 4 such as Fig. 1) on, piezo-electric sheet 202 with electrode periodically is arranged in the inboard of dry-friction damping parts 1, and connect with circuit separately 201, according to existing circuit to connect between each piezo-electric sheet 202 of design, also may not connect (such as the dot and dash line among the figure), component and electric wire are fixed on the inboard of dry-friction damping parts 1 equally.
Fig. 2 is that composite damping assembly axis of the present invention is to the assembly relation schematic representation; Limit position part 3 is fixed on the vibration damping object 4 with bolt 6, arranges equably that vertically several, its effect are moving axially of restriction dry-friction damping parts 1.
Fig. 3 is the schematic representation that there is the parallel network circuit in the piezo-electric damping parts among the present invention; Each piezo-electric sheet 202 resistance R at first in parallel and capacitor C e, form relation in parallel with other piezo-electric sheets 202 respectively again, at this moment, the electric current l in each branch circuit i, 1≤i≤N can influence each other (namely satisfying kirchhoff electric current theorem and voltage theorem).
Fig. 4 is the schematic representation that there is the series network circuit in the piezo-electric damping parts among the present invention; Each piezo-electric sheet 202 resistance R at first in parallel and capacitor C e, form series relationship with other piezo-electric sheets 202 respectively again, at this moment, the electric current l in each branch circuit i, 1≤i≤N equates.
Fig. 5 is without the schematic representation of lattice network among the present invention; 202 of each piezo-electric sheets and each self-corresponding resistance R and capacitor C eLink to each other, concern without network connection between the piezo-electric sheet 202, at this moment, the electric current l in each branch circuit i, 1≤i≤N is mutually without impact.
Fig. 6 is the damping ring that adopts of the dry-friction damping parts among the present invention/tube-in-tube structure schematic representation; The profile of piezo-electric sheet mountion plate 101 is for connecting on the circumference 2 straight line, so that the installation of piezo-electric sheet 202.Has bolt hole 105 on the tension flange 103, with the closure of assist openings 102.Balancing weight 104 places the offside of tension flange 103, in order to make whole vibration damping ring/sleeve not produce eccentric mass.
Fig. 7 a, Fig. 7 b, Fig. 7 c are the axial limiting block diagram among the present invention.Bolt hole shown in Fig. 7 c is used for being connected with vibration damping object 5.This limit position part has sector structure shown in Fig. 7 a, in order to fit with the wheel rim of vibration damping object 4.Its section is L-shaped shown in Fig. 7 b, and wherein F1, F2, F3 face all have certain gap with damping ring/sleeve.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The present invention is a kind of novel vibration damping equipment, described vibration damping equipment comprises dry-friction damping parts 1, piezo-electric damping parts 2 and limit position part 3, as depicted in figs. 1 and 2, described piezo-electric damping parts 2 are fixed on the inboard of dry-friction damping parts 1, and dry-friction damping parts 1 are fixed on the vibration damping object 4 by limit position part 3.
Dry friction parts 1 have the form of damping ring/sleeve, and as shown in Figure 6: the outside of dry friction parts 1 is its attachment face in real work, is connected with vibration damping object 4, provides dry friction at surface of contact; The inboard of dry friction parts 1 is provided with the mountion plate 101 of piezo-electric damping parts 2, and the number of mountion plate 101 equates with the number of piezo-electric sheet 202 in the piezo-electric damping parts 2.The inboard of dry friction parts 1 is not desirable circle, and at the installed position of piezo-electric sheet 202, mountion plate 101 external forms are one section straight line that connects on the circumference at 2, and the thickness at mountion plate 101 places is greater than the thickness of the ring/sleeve in other place of dry friction parts 1.The damping of dry friction parts 1 depends on the outer surface of dry friction parts 1 and the positive pressure on the vibration damping object 4 inboard surface of contact that form, this positive pressure is realized by the pre-opening amount of dry friction ring/sleeve, as shown in Figure 6, the flange 103 at opening 102 places and bolt hole 105 are used for assisting assembling, namely, at first with bolt with opening 102 closures, then place the inboard of vibration damping object 4, decontrol again bolt.Like this, the elastic restoring force that produces in damping ring/sleeve acts on the surface of contact, forms contact.Being in same diameter with tension flange 103 on damping ring/sleeve and being positioned on the position of opposite side on the circumference, be provided with counterweight 104, its effect is to make the center of gravity of damping ring/sleeve still be positioned at circle centre position, the quality of counterweight 104 equates with the quality of flange 103.
Piezo-electric damping parts 2 by distributed piezo-electric sheet 202 with are connected the circuit 201 that connects separately and consist of.Piezo-electric sheet 202 is installed on the mountion plate 101 of dry friction parts 1 inboard, can adopt solid gum bonding or design in addition compressing component and connect.Damping ring/the sleeve of the axial length of piezo-electric sheet 202 and dry-friction damping parts 1 structure is suitable, piezo-electric sheet 202 is evenly and discretely to arrange at circumferencial direction, its quantity depends on the vibration characteristics of vibration damping object 4, generally should equate with its cycle, piezo-electric sheet 202 should be arranged on vibration damping object 4 each local strain extreme value place, so that " mean strain " maximum under piezo-electric sheet 202 coverage rates.This strategy is in order to make the mechanical-electric coupling maximizing efficiency of piezo-electric damping parts 2.Obtaining preferably on the basis of mechanical-electric coupling efficient, the vibration suppressioning effect of piezo-electric damping parts 2 also depends on the design of its circuit 201.Electric wire in the circuit 201 and component (electric capacity, inductance, resistance) also are attached to the inboard of dry-friction damping parts 1, and also available solid gum is fixed.The Placement of circuit 201 and piezo-electric sheet 202 upper electrodes can be diversified, can be parallel network (Fig. 3), series network (Fig. 4) and individual branches (Fig. 5) etc.The value of component in the circuit 201 (resistance, electric capacity and inductance), and the Placement of each piezo-electric sheet 202 upper electrode, determine by the characteristic of the suffered excitation force of the dynamics (natural frequency, the vibration shape) of vibration damping object 4 and vibration damping object 4 (excitation force distributes, excited frequency composition), in actual design process, will be referred to the series of optimum process.
Limit position part 3 is used for the axial position of restriction dry friction parts 1, and be connected on the vibration damping object 4 with bolt, on dry friction parts 1 circumference, arrange equably a plurality of limit position parts 3, such as Fig. 2 and shown in Figure 7, in limit position part 3, its F1, F2, F3 face form the space of a L shaped sealing, dry friction parts 1 are included in wherein, between each face and the dry friction parts 1 a small amount of gap is arranged simultaneously, do not contact during installation, shown in Fig. 7 a, 7b, 7c.This limit position part 3 has sector structure, in order to fit with the wheel rim of vibration damping object 4.
The present invention proposes the multiple possibility implementation of piezoelectricity-dry friction composite damping device, can be used for the vibration suppression of rotating machinery.The choosing and General layout Plan of arrangement, circuit that comprises its axial limiting, piezoelectric material.The piezoresistance damping technology is combined with the dry friction damping technology, propose piezoelectric material is distributed on the non-contact face of dry-friction damping ring/sleeve discretely, with dry-friction damping ring/sleeve argument structure distortion, the thought of dissipates vibration energy.

Claims (8)

1. piezoelectricity-dry friction composite damping device, it is characterized in that: comprise dry-friction damping parts, piezo-electric damping parts and limit position part, described piezo-electric damping parts are fixed on the inboard of dry-friction damping parts, and the dry-friction damping parts are fixed on the vibration damping object by limit position part 3.
2. piezoelectricity according to claim 1-dry friction composite damping device, it is characterized in that: described piezo-electric damping parts comprise piezo-electric sheet and circuit, electric wire in the circuit and component are fixed on the inboard of dry-friction damping parts, and the Placement of circuit and piezo-electric sheet upper electrode is parallel network, series network or and individual branches.
3. piezoelectricity according to claim 1-dry friction composite damping device, it is characterized in that: described dry-friction damping parts are damping ring/tube-in-tube structure, damping ring/tube-in-tube structure setting has the hatch frame of flange, and the position relative with opening arranges counterweight; Be provided with the mountion plate of piezo-electric sheet at the internal surface of described damping ring/sleeve.
4. piezoelectricity according to claim 1-dry friction composite damping device, it is characterized in that: the quantity of described mountion plate equals the quantity of piezo-electric sheet, and the quantity of piezo-electric sheet equals the vibration cycle of vibration damping object.
5. piezoelectricity according to claim 1-dry friction composite damping device, it is characterized in that: described mountion plate is positioned at each local strain extreme value place of corresponding vibration damping object on damping ring/sleeve.
6. piezoelectricity according to claim 1-dry friction composite damping device, it is characterized in that: described limit position part has sector structure, and the cross section is L-type, when the inner surface of L-type is installed and gapped between the dry-friction damping parts.
7. piezoelectricity according to claim 1-dry friction composite damping device, it is characterized in that: described limit position part has more than 2.
8. piezoelectricity according to claim 1-dry friction composite damping device, it is characterized in that: described mountion plate external form is one section straight line that connects on damping ring/sleeve circumference at 2, and the thickness at mountion plate place is greater than other local thickness of damping ring/sleeve.
CN201210488784.8A 2012-11-26 2012-11-26 Piezoelectric-dry friction composite damping device Active CN102996706B (en)

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Publication number Priority date Publication date Assignee Title
CN105090343A (en) * 2015-07-02 2015-11-25 哈尔滨工业大学 Vibration and noise reduction damping ring used for light and thin gear

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3637571A1 (en) * 1986-11-04 1988-05-05 Salje Ernst Frictional vibration damper for machine tools
JPH0714243U (en) * 1993-08-10 1995-03-10 株式会社ユニシアジェックス Torsional vibration reduction device
JPH10240348A (en) * 1997-02-27 1998-09-11 Toshiba Corp Fine moving device
JP2000224873A (en) * 1999-01-28 2000-08-11 Honda Motor Co Ltd Piezoelectric actuator
US20070114887A1 (en) * 2005-06-01 2007-05-24 D Almeida Oscar Materials of active-piston actuators
CN101250909A (en) * 2008-03-28 2008-08-27 东南大学 Piezoelectricity friction intelligent damper
CN101851963A (en) * 2010-06-23 2010-10-06 湖南大学 Piezoelectric-SMA composite variable friction intelligent damper
CN102051924A (en) * 2009-11-04 2011-05-11 青岛理工大学 Smart piezoelectric damping controller
CN202483026U (en) * 2012-03-16 2012-10-10 大连理工大学 Rod type piezoelectric friction damper

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3637571A1 (en) * 1986-11-04 1988-05-05 Salje Ernst Frictional vibration damper for machine tools
JPH0714243U (en) * 1993-08-10 1995-03-10 株式会社ユニシアジェックス Torsional vibration reduction device
JPH10240348A (en) * 1997-02-27 1998-09-11 Toshiba Corp Fine moving device
JP2000224873A (en) * 1999-01-28 2000-08-11 Honda Motor Co Ltd Piezoelectric actuator
US20070114887A1 (en) * 2005-06-01 2007-05-24 D Almeida Oscar Materials of active-piston actuators
CN101250909A (en) * 2008-03-28 2008-08-27 东南大学 Piezoelectricity friction intelligent damper
CN102051924A (en) * 2009-11-04 2011-05-11 青岛理工大学 Smart piezoelectric damping controller
CN101851963A (en) * 2010-06-23 2010-10-06 湖南大学 Piezoelectric-SMA composite variable friction intelligent damper
CN202483026U (en) * 2012-03-16 2012-10-10 大连理工大学 Rod type piezoelectric friction damper

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