CN101329865A - Resonance sound-absorbing structure for sheet - Google Patents
Resonance sound-absorbing structure for sheet Download PDFInfo
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- CN101329865A CN101329865A CNA2007101190107A CN200710119010A CN101329865A CN 101329865 A CN101329865 A CN 101329865A CN A2007101190107 A CNA2007101190107 A CN A2007101190107A CN 200710119010 A CN200710119010 A CN 200710119010A CN 101329865 A CN101329865 A CN 101329865A
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Abstract
The invention relates to a thin plate resonance sound absorption structure which comprises a metal thin plate and a piezoelectric ceramic piece pasted on the metal thin plate. A resistor is connected between the two poles of the piezoelectric ceramic piece. The structure of the invention can fulfill the following technical effects of: being capable of effectively improving acoustical absorptivity at the basic frequency of the thin plate, tuning out another sound absorption peak through adjusting inductance and effectively widening the width of sound absorption frequency band through the combination of the sound absorption peak tuned out and the basic frequency sound absorption peak of the thin plate. Besides, the structure of the invention has light weight and small installation space and the acoustical absorptivity around the resonance frequency can reach more than 0.9.
Description
Technical field
The invention belongs to sound absorption control field, specifically, the present invention relates to a kind of thin plate sound absorption structure.
Background technology
Resonance sound-absorbing structure for sheet is a kind of low-frequency sound-absorbing structure, the ultimate principle of its sound absorption is when sound wave incides plate surperficial, the modal vibration of excitation plate, acoustic energy is converted to the energy of vibration of plate, utilize the damping loss of plate, convert the vibrational energy of plate to heat energy, thereby reach the purpose of sound absorption.The sheet material of this sound absorption structure is made of timber, metal material, plastics etc. usually.Because the dissipation factor of these materials is smaller, and is all very low usually at the acoustical absorption coefficient at mode place, first rank.For enough dampings are provided, improve the sound absorption characteristics of board-like resonance sound-absorbing structure, addition of constraints damping layer onboard perhaps adds foamed material and fibrous material in the cavity behind plate usually.Its typical structure as shown in Figure 1.The 1st, the resonance thin plate; The 2nd, restriction damping layer is for thin plate provides damping action; The 3rd, resonant cavity constitutes the elastic reactance of resonator system with the elasticity of thin plate, and the quality of plate and restriction damping layer constitutes the mass reactance of resonator system; The damping of system is provided jointly by internally-damped, the edge constraint of thin plate and the damping of restriction damping layer, if fiberfill fibers or foamed material in the cavity also can be resonator system the part damping is provided; The 4th, support plays the effect of splint fixation, is served as a contrast 5 with rigidity and constitutes enclosed cavity 3.
The shortcoming of this resonance sound-absorbing structure for sheet is, acoustical absorption coefficient is lower, and restriction damping layer can increase the weight of sound absorption structure significantly, and its damping to be subjected to the influence that temperature etc. changes bigger.If fiberfill fibers or foamed material also can pollute environment in the cavity.At low frequency, need bigger cavity, so just bigger installing space must be arranged.
Summary of the invention
The thin plate low-frequency sound-absorbing structure that the purpose of this invention is to provide a kind of do not need restraint damping layer, resonant cavity and packing material.
For achieving the above object, resonance sound-absorbing structure for sheet provided by the invention comprises sheet metal and the piezoelectric ceramic piece that sticks on this sheet metal, and described piezoelectric ceramic piece is connected to resistance between the two poles of the earth.
In the technique scheme, described piezoelectric ceramic thin sheet the two poles of the earth also are connected to inductance indirectly, and described inductance is connected with described resistance.
In the technique scheme, described inductance is a variable inductance.
In the technique scheme, use conductive adhesive between described piezoelectric ceramic piece and sheet metal.
In the technique scheme, described inductance is the simulaed inductance of being realized by two operational amplifiers.
In the technique scheme, the Standard resistance range of described resistance is done between ohm to 30 at 5 ohm.
In the technique scheme, the span of described inductance at 0.1 henry between 30 henries.
In the technique scheme, the edge partial fixing of described sheet metal.
In the technique scheme, the thickness of described piezoelectric ceramic piece is less than the thickness of described sheet metal.
Technique effect of the present invention is as follows:
Can effectively improve the acoustical absorption coefficient at thin plate fundamental frequency place; And can access another one sound absorption peak by regulating inductance, combine, can effectively widen the width of sound sucting band with the fundamental frequency sound absorption peak of thin plate.In addition, of the present invention in light weight, installing space is little, and can reach more than 0.9 near the acoustical absorption coefficient resonant frequency.
Description of drawings
Fig. 1 is existing typical low frequency resonance sound-absorbing structure for sheet figure;
Fig. 2 is low frequency resonance sound-absorbing structure for sheet figure of the present invention;
Fig. 3 is the external divided circuit figure of piezoelectric ceramic piece two electrodes;
Fig. 4 is the acoustical absorption coefficient synoptic diagram of one embodiment of the invention.
Embodiment
Sound absorption structure of the present invention is made up of sheet metal and piezoelectric ceramic thin sheet, is connected to the series circuit of resistance and inductance between piezoelectric ceramic thin sheet the two poles of the earth.Utilize the first rank mode resonance of sheet metal, its damping is provided by the damping of thin plate itself and the piezoelectric ceramic piece that is connected to circuit.When sound wave incides on the thin plate, the modal vibration of excitation thin plate, a vibrational energy part changes into heat energy by the damping of thin plate; Another part converts electric energy to by piezoelectric ceramic piece, and electric current produces heat energy by the circuit acting that piezoelectricity pottery sheet the two poles of the earth connect, thereby reaches the purpose of sound absorption.
Below in conjunction with the drawings and specific embodiments the present invention is done to describe further.
Embodiment 1
Present embodiment is the thin plate sound absorption structure that is applied to low frequency, and shown in Figure 2 is the structural representation of present embodiment, and the key distinction of it and resonance sound-absorbing structure for sheet shown in Figure 1 is to have replaced restriction damping layer 2 with piezoelectric ceramic piece 6.Its advantage is that the equivalent damping coefficient of piezoelectric ceramic piece can be regulated by the divided circuit parameter, can control the acoustical absorption coefficient of sheet metal like this, increases substantially near resonant frequency.And piezoelectric ceramic piece is lighter with respect to the restriction damping layer quality, and its damping characteristic is not subjected to environmental factors such as temperature and changes.Resonance sound-absorbing structure for sheet of the present invention does not in addition need enclosed cavity, has so just reduced the installing space of whole sound absorption structure greatly.
In the present embodiment, four limits of sheet metal 1 (being the edge part) fixes by stationary fixture 8, encouraged the first rank mode resonance of thin plate when sound wave incides thin plate surperficial, thereby forms resonance sound-absorbing mechanism at low frequency.The sound absorption frequency can realize by size and the thickness of regulating thin plate.1 available conductive adhesive of piezoelectric ceramic piece 6 and sheet metal, the bonding end of sheet metal 1 and piezoelectric ceramic piece 6 is ground connection directly, and be connected with the earth terminal of divided circuit 7.Another electrode of piezoelectric ceramic piece 6 links to each other with the other end of divided circuit 7.
The concrete form of divided circuit 7 is composed in series by resistance 9 and simulaed inductance 10 as shown in Figure 3.If divided circuit 7 has only resistance 9 to constitute, can improve the acoustically effective at resonant frequency place equally, this moment, circuit was very simple, but the degree that acoustically effective improves is limited.Can improve significantly acoustically effective by series connection simulaed inductance 10, not only can improve the acoustical absorption coefficient at resonant frequency place, and can access second sound absorption peak, can widen sound sucting band effectively like this.Adopt which kind of circuit to decide according to demand in concrete the enforcement.Because design is low frequency absorption mechanism, need the above big inductance of several henries in the circuit.Inductance is the simulaed inductance of realizing with operational amplifier 11 10.Concrete circuit diagram is as shown in the dotted line among Fig. 3, and by 3 fixed resistances 12,13,14 and adjustable resistance 15, and electric capacity 16 and two operational amplifiers 11 constitute.Wherein the big I of simulaed inductance realizes by regulating adjustable resistance 15.In whole divided circuit, resistance in series provides energy loss mechanism for structure, and inductance has then played tuning effect.
Choosing of resistance 9 is main relevant with the electromechanical coupling factor and the internal resistance of piezoelectric, and choosing of inductance 10 is then relevant with the equivalent capacity of the sound absorption frequency that will control, piezoelectric.Being chosen between 5 ohm to 30 kilohms of resistance 9 changes in the experiment, and the span of inductance then changes between 30 henries at 0.1 henry.Sheet metal can the side's of employing plate or plectane, but is not limited to this two kinds of shapes.Choosing of the size of sheet metal is to be decided by the sound absorption frequency that will control equally.The fundamental frequency of sheet metal is by its density, elasticity coefficient, size, boundary condition decision.Therefore after the sound absorption frequency of control is decided, can select the size of sheet metal as required.The thickness of piezoelectric ceramic piece should not be greater than gauge of sheet, in order to avoid excessive to the fundamental frequency influence of thin plate.
The sound absorption frequency of controlling in the experiment is near 208Hz, and under the situation that does not add piezoelectric ceramics sheet and divided circuit thereof, acoustical absorption coefficient has only about 0.4.After pasting piezoelectric ceramic piece and divided circuit, its acoustical absorption coefficient has reached more than 0.9, and has accessed two sound absorption peaks (as shown in Figure 4), thereby making that sound sucting band is corresponding widens.Because parameter such as piezoelectric ceramic piece is subjected to variable effect such as temperature very little, and it is very little to quality that total system increases.Therefore this control method has light weight and advantage such as temperature influence not with comparing with the method for increase system dampings such as elastomeric material.And this structure does not need the closed cavity of back, so its installing space can reduce greatly.
Thin plate low-frequency resonance sound absorption structure light weight of the present invention does not need big installing space.Not only be suitable for anechoic room, music hall etc. and require the building room of effect of low-frequency sound absorption, and can be applied to the low-frequency noise control of pipeline and various electrical equipment.
Claims (9)
1, a kind of resonance sound-absorbing structure for sheet comprises sheet metal and the piezoelectric ceramic piece that sticks on this sheet metal, and described piezoelectric ceramic piece is connected to resistance between the two poles of the earth.
2, by the described resonance sound-absorbing structure for sheet of claim 1, it is characterized in that described piezoelectric ceramic thin sheet the two poles of the earth also are connected to inductance indirectly, described inductance is connected with described resistance.
3, by the described resonance sound-absorbing structure for sheet of claim 1, it is characterized in that described inductance is a variable inductance.
4, by the described resonance sound-absorbing structure for sheet of claim 1, it is characterized in that, use conductive adhesive between described piezoelectric ceramic piece and sheet metal.
By the described resonance sound-absorbing structure for sheet of claim 1, it is characterized in that 5, described inductance is the simulaed inductance of being realized by two operational amplifiers.
6, by the described resonance sound-absorbing structure for sheet of claim 1, it is characterized in that the Standard resistance range of described resistance is between 5 ohm to 30 kilohms.
7, by the described resonance sound-absorbing structure for sheet of claim 1, it is characterized in that, the span of described inductance at 0.1 henry between 30 henries.
8, by the described resonance sound-absorbing structure for sheet of claim 1, it is characterized in that the edge partial fixing of described sheet metal.
9, by the described resonance sound-absorbing structure for sheet of claim 1, it is characterized in that the thickness of described piezoelectric ceramic piece is less than the thickness of described sheet metal.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101190107A CN101329865A (en) | 2007-06-18 | 2007-06-18 | Resonance sound-absorbing structure for sheet |
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| CNA2007101190107A CN101329865A (en) | 2007-06-18 | 2007-06-18 | Resonance sound-absorbing structure for sheet |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332259A (en) * | 2011-10-12 | 2012-01-25 | 中国科学院合肥物质科学研究院 | Adaptive micro-perforated plate sound absorber and real-time micropore adjusting method thereof |
| CN101515453B (en) * | 2008-02-22 | 2012-07-04 | 雅马哈株式会社 | Sound absorbing structure and vehicle component having sound absorption property |
| CN103559877A (en) * | 2013-07-17 | 2014-02-05 | 南京大学 | Composite sound absorption structure based on shunt loudspeaker and micro-perforated plate |
| CN103592020A (en) * | 2013-11-09 | 2014-02-19 | 严志杰 | Vibration signal wireless collecting device |
| CN104078037A (en) * | 2014-07-11 | 2014-10-01 | 南京大学 | Low-frequency double-resonance sound-absorbing structure and design method thereof |
| CN104835489B (en) * | 2015-04-23 | 2018-05-18 | 西安交通大学 | Towards the lightweight intelligence sound partiting system and its method of work of low frequency time-varying noise source |
| CN108932939A (en) * | 2017-05-26 | 2018-12-04 | 南京大学 | It is a kind of to have the slim sound absorption structure and its design method for adjusting noise for low frequency |
| CN108964519A (en) * | 2018-07-16 | 2018-12-07 | 西北工业大学 | A kind of plate-type energy capture structure and method based on RL resonant circuit |
| CN114498502A (en) * | 2021-12-21 | 2022-05-13 | 平高集团有限公司 | Noise suppression subassembly of high-voltage bus and bus barrel |
| CN115148462A (en) * | 2022-07-05 | 2022-10-04 | 江苏省电力试验研究院有限公司 | Base and dry-type iron core reactor with damping function |
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2007
- 2007-06-18 CN CNA2007101190107A patent/CN101329865A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515453B (en) * | 2008-02-22 | 2012-07-04 | 雅马哈株式会社 | Sound absorbing structure and vehicle component having sound absorption property |
| CN102332259A (en) * | 2011-10-12 | 2012-01-25 | 中国科学院合肥物质科学研究院 | Adaptive micro-perforated plate sound absorber and real-time micropore adjusting method thereof |
| CN102332259B (en) * | 2011-10-12 | 2012-07-25 | 中国科学院合肥物质科学研究院 | Adaptive micro-perforated plate sound absorber and real-time micropore adjusting method thereof |
| CN103559877A (en) * | 2013-07-17 | 2014-02-05 | 南京大学 | Composite sound absorption structure based on shunt loudspeaker and micro-perforated plate |
| CN103592020A (en) * | 2013-11-09 | 2014-02-19 | 严志杰 | Vibration signal wireless collecting device |
| CN104078037A (en) * | 2014-07-11 | 2014-10-01 | 南京大学 | Low-frequency double-resonance sound-absorbing structure and design method thereof |
| CN104835489B (en) * | 2015-04-23 | 2018-05-18 | 西安交通大学 | Towards the lightweight intelligence sound partiting system and its method of work of low frequency time-varying noise source |
| CN108932939A (en) * | 2017-05-26 | 2018-12-04 | 南京大学 | It is a kind of to have the slim sound absorption structure and its design method for adjusting noise for low frequency |
| CN108964519A (en) * | 2018-07-16 | 2018-12-07 | 西北工业大学 | A kind of plate-type energy capture structure and method based on RL resonant circuit |
| CN114498502A (en) * | 2021-12-21 | 2022-05-13 | 平高集团有限公司 | Noise suppression subassembly of high-voltage bus and bus barrel |
| CN114498502B (en) * | 2021-12-21 | 2023-03-07 | 平高集团有限公司 | Noise suppression subassembly of high-voltage bus and bus barrel |
| CN115148462A (en) * | 2022-07-05 | 2022-10-04 | 江苏省电力试验研究院有限公司 | Base and dry-type iron core reactor with damping function |
| CN115148462B (en) * | 2022-07-05 | 2023-11-17 | 江苏省电力试验研究院有限公司 | Base with vibration reduction function and dry type iron core reactor |
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Open date: 20081224 |