CN109801615A - A kind of flexibility Helmholtz's sound is adjusted and controlled - Google Patents
A kind of flexibility Helmholtz's sound is adjusted and controlled Download PDFInfo
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- CN109801615A CN109801615A CN201811516462.3A CN201811516462A CN109801615A CN 109801615 A CN109801615 A CN 109801615A CN 201811516462 A CN201811516462 A CN 201811516462A CN 109801615 A CN109801615 A CN 109801615A
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Abstract
The present invention relates to a kind of flexible Helmholtz's sound is adjusted and controlled, flexible Helmholtz resonator and waveguide including the adjacent laying of side wall are connected to form coupled structure between flexible Helmholtz's cavity and waveguide by slit；Identical membrane structure is laid respectively in two open ends of flexible Helmholtz's cavity；The present invention changes the coupled resonance of flexible Helmholtz resonator and waveguide by adjusting the tension of film in membrane structure, realize low frequency can voicing control；The device controls the low frequency sound transmission using the coupled resonance between waveguide and Helmholtz's cavity, by adjusting membrane tension, changes the regulation of low-frequency sound wave of the coupled resonance of flexibility HR and waveguide.
Description
Technical field
The present invention relates to a kind of flexible Helmholtz's sound is adjusted and controlled, belong to audio acoustic and environmental noise abatement field.
Background technique
All-bottom sound regulation is attracted wide public concern due to its application in terms of noise suppressed harmony control.Theoretically,
Thin and light structure is difficult to use to control low-frequency sound wave transmission.For the adjusting for realizing low-frequency sound wave, membrane resonant system is obtained
Sufficient research.It nonetheless, is still one using small structure realization low frequency band logical and the tunable filter with inhibition effect
Difficult task.
Summary of the invention
It is adjusted and controlled that the present invention provides a kind of flexible Helmholtz's sound, the device using waveguide and Helmholtz's cavity it
Between coupled resonance control the low frequency sound transmission, pass through and adjust membrane tension, change the coupled resonance of flexibility HR and waveguide
The regulation of low-frequency sound wave.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of flexibility Helmholtz's sound is adjusted and controlled, flexible Helmholtz resonator and waveguide including the adjacent laying of side wall
Pipe, is connected to form coupled structure between flexible Helmholtz's cavity and waveguide by slit；
Identical membrane structure is laid respectively in two open ends of flexible Helmholtz's cavity；
By adjusting the tension of film in membrane structure, the coupling for changing flexible Helmholtz resonator and waveguide is humorous
Vibration, realize low frequency can voicing control；
As present invention further optimization, slit above-mentioned is located at the center of waveguide, and waveguide is divided into pair
Two parts claimed；
As present invention further optimization, flexibility Helmholtz resonator cross section above-mentioned is round or square
Or rectangle structure；
As present invention further optimization, waveguide cross-section above-mentioned is round or square or triangle knot
Structure；
As present invention further optimization, slit above-mentioned be provided with flexible Helmholtz resonator and waveguide it
Between cavernous structure, cross section is round or triangle or square；
As present invention further optimization, membrane structure above-mentioned is film；
As present invention further optimization, membrane structure above-mentioned includes film and mass block, and mass block is bonded in thin
Film surface, vibration of thin membrane drive mass block vibration；
As present invention further optimization, waveguide is linear structure or bending structure；Slit is linear type
Structure or bending structure.
By above technical scheme, compared with the existing technology, the invention has the following advantages:
The present invention adjusts membrane tension, and then the Coupling Vibration Model of control system using electromagnetic force, may be implemented adjustable
Pictophonetic characters transmission；
The present invention is inseparable with flexibility HR, the coupled resonance of waveguide, has studied its three kinds of Coupling Vibration Models, helps
In the sound transmission characteristics for disclosing coupled structure；
The present invention is small in size, can achieve the purpose with the small structure of wavelet length to low-frequency sound wave regulation system.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the coupled structure schematic diagram of the preferred embodiment of the present invention, wherein 1a is overall schematic, and 1b is coupling
The side view of structure, 1c are the top view of coupled structure；
Fig. 2 is the coupled structure theory analysis figure of the preferred embodiment of the present invention；
Fig. 3 is the preferred embodiment of the present invention by adjusting film rigidity, composes to sound transmission and carries out test measurement data.
In figure: 1 is flexible Helmholtz's cavity, and 2 be slit, and 3 be waveguide, and 4 be membrane structure.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in Figure 1, the preferred embodiment of the present invention includes following characteristics component: 1 is flexible Helmholtz's cavity, and 2 are
Slit, 3 be waveguide, and 4 be membrane structure.
A kind of flexible Helmholtz's sound of the invention is adjusted and controlled, the flexible helmholtz resonance including the adjacent laying of side wall
Device and waveguide are connected to form coupled structure between flexible Helmholtz's cavity and waveguide by slit；
Identical membrane structure is laid respectively in two open ends of flexible Helmholtz's cavity；
By adjusting the tension of film in membrane structure, the coupling for changing flexible Helmholtz resonator and waveguide is humorous
Vibration, realize low frequency can voicing control；
As present invention further optimization, slit above-mentioned is located at the center of waveguide, and waveguide is divided into pair
Two parts claimed；
As present invention further optimization, flexibility Helmholtz resonator cross section above-mentioned is round or square
Or rectangle structure；
As present invention further optimization, waveguide cross-section above-mentioned is round or square or triangle knot
Structure；The length of waveguide can remain unchanged, also adjustable；
As present invention further optimization, slit above-mentioned be provided with flexible Helmholtz resonator and waveguide it
Between cavernous structure, cross section is round or triangle or square；
As present invention further optimization, membrane structure above-mentioned is film；Can be used different parameters, type it is thin
Film replaces the rigid structure of former flexible two open end of Helmholtz's cavity；
As present invention further optimization, membrane structure above-mentioned includes film and mass block, and mass block is bonded in thin
Film surface, vibration of thin membrane drive mass block vibration；
As present invention further optimization, waveguide is linear structure or bending structure；Slit is linear type
Structure or bending structure.
To sum up, it is filtered with flexible Helmholtz resonator (Helmholtz Resonator, HR) Lai Shixian mono- adjustable sound
Wave device, the design of two of them membrane structure (MSs) is instead of the rigid structure in traditional HR, then, provides a waveguide
Pipe is coupled with flexibility HR；The detailed design plan of coupled structure is as shown in Figure 1, flexibility HR is by two rigid plates and two MSs
The main rigid structure of composition；Upper space on flexible HR forms waveguide, and flexible HR is coupled with waveguide by slit formation
Structure influences the coupled resonance of flexible HR and waveguide, changes transmission spectrum, realize that low frequency is tunable by adjusting membrane tension
Acoustic control.
Specifically as shown in Figure 1, according to the acoustic apparatus comprising particular resonance system that the application is drawn, including side wall phase
The flexible Helmholtz resonator and waveguide that neighbour lays, are connected to shape by slit between flexible Helmholtz's cavity and waveguide
At coupled structure；
Identical membrane structure is laid respectively in two open ends of flexible Helmholtz's cavity；
The structure of flexible Helmholtz's cavity is designed to rectangular parallelepiped structure, structural material is selected organic glass, can be regarded as
Bounds concentrate the sound wave of set pattern 100-2000Hz, in which:
Waveguide is for connecting incident outgoing side, and conducted acoustic waves, medium is air；
Flexible Helmholtz resonator is used to form coupled vibrations with waveguide, and adjusts vibration mode；
Slit is for connecting waveguide and flexible Helmholtz resonator, in order to avoid the influence of slit, by the length of slit
Degree and width setting are as small as possible；
The changeability of the parameter of membrane structure provides adjustable transmission spectrum, and the size by changing electromagnetic force changes coupling
Close the state of vibration, thus it is possible to vary the transmission spectrum of structure；
Shown in Fig. 2, theory analysis figure of the invention, for illustrating Principles of Acoustics of the invention, membranous system in figure can be with
It is considered as spring oscillator, it is as follows to list incident and transmission side dynamic equilibrium equation according to the figure:
WhereinMiAnd KiIt is the quality and effective rigidity of incidence end membranous system respectively； MtAnd KtIt is the quality and effective rigidity of transmission end membranous system respectively；Pi, Pr and Pt be respectively into
Penetrate, reflect and transmit acoustic pressure；ρ and c is the density and acoustic velocity of medium respectively；Rm and S3 is damped coefficient and coupling last of the twelve Earthly Branches nurse respectively
The hereby cross-sectional area of cavity suddenly；K, d and i are respectively wave vector, coupling Helmholtz's cavity length and imaginary unit；A1-A10 points
It Biao Shi not the sound wave incidence and reflecting acoustic pressure that do not exist together in structure；When fissipation factor changes to 0.01 from 0, in coupled structure
Three primary modals are excited.
Fig. 3 is sample experiments as a result, generating different film rigidity by adjusting different voltages, is composed to sound transmission of the invention
Carry out experiment measurement.
It can be seen that moved back in low-frequency range as alive increases of institute transmits a trough, this is because the increase of voltage so that
The resonance frequency of coupled structure increases, thus we by can by change alive size control transmission spectrum trough
Position, to achieve the purpose that carry out tunable filtering to low-frequency sound wave.
To sum up, it is filtered with flexible Helmholtz resonator (Helmholtz Resonator, HR) Lai Shixian mono- adjustable sound
Wave device, the design of two of them membranous system (MSs) is instead of the rigid structure in traditional HR, then, provides a waveguide
It is coupled with flexible HR；The detailed design plan of coupled structure is as shown in Figure 1, flexibility HR is by two rigid plates and two MSs groups
At main rigid structure；Upper space on flexible HR forms waveguide.Flexible HR couples knot by slit formation with waveguide
Structure influences the coupled resonance of flexible HR and waveguide, changes transmission spectrum, realize the adjustable pictophonetic characters of low frequency by adjusting membrane tension
Control.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in the application fields.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.
The meaning of "and/or" described herein refers to that the case where respective individualism or both exists simultaneously wraps
Including including.
The meaning of " connection " described herein can be between component be directly connected to be also possible to pass through between component
Other components are indirectly connected with.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (8)
1. a kind of flexibility Helmholtz's sound is adjusted and controlled, it is characterised in that: the flexible Helmholtz including the adjacent laying of side wall is total
Shake device and waveguide, is connected to form coupled structure by slit between flexible Helmholtz's cavity and waveguide；
Identical membrane structure is laid respectively in two open ends of flexible Helmholtz's cavity；
By adjusting the tension of film in membrane structure, change the coupled resonance of flexible Helmholtz resonator and waveguide, in fact
Existing low frequency can voicing control.
2. flexibility Helmholtz's sound according to claim 1 is adjusted and controlled, it is characterised in that: slit above-mentioned is located at waveguide
Waveguide is divided into symmetrical two parts by the center of pipe.
3. flexibility Helmholtz's sound according to claim 1 is adjusted and controlled, it is characterised in that: flexibility Helmholtz above-mentioned
Resonator cross section is round or square or rectangle structure.
4. flexibility Helmholtz's sound according to claim 1 is adjusted and controlled, it is characterised in that: waveguide cross-section above-mentioned
For round or square or triangular structure.
5. flexibility Helmholtz's sound according to claim 1 is adjusted and controlled, it is characterised in that: slit above-mentioned is to be provided with
Cavernous structure between flexible Helmholtz resonator and waveguide, cross section are round or triangle or square.
6. flexibility Helmholtz's sound according to claim 1 is adjusted and controlled, it is characterised in that: membrane structure above-mentioned is thin
Film.
7. flexibility Helmholtz sound according to claim 1 is adjusted and controlled, it is characterised in that: membrane structure above-mentioned includes
Film and mass block, mass block are bonded in film surface, and vibration of thin membrane drives mass block vibration.
8. flexibility Helmholtz's sound according to claim 1 is adjusted and controlled, it is characterised in that: waveguide is linear structure
Or bending structure；Slit is linear structure or bending structure.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113470605A (en) * | 2021-06-10 | 2021-10-01 | 西安交通大学 | Continuously adjustable sound absorption structure |
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2018
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| US20100212999A1 (en) * | 2007-03-28 | 2010-08-26 | David Shawn Marion | Helmholtz resonator |
| US8418804B1 (en) * | 2011-12-20 | 2013-04-16 | King Fahd University Of Petroleum And Minerals | Multiple Helmholtz resonators |
| CN103629022A (en) * | 2012-08-22 | 2014-03-12 | 曼胡默尔滤清器（上海）有限公司 | Variable-frequency Helmholtz resonant cavity used for automobile air intake system |
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| CN106297762A (en) * | 2016-08-16 | 2017-01-04 | 南京工业大学 | A kind of method that nonlinear characteristic utilizing Helmholtz resonator changes acoustics metamaterial passband |
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| HUI ZHANG ET AL.: "Tunable acoustic filters assisted by coupling vibrations of a flexible Helmholtz resonator and a waveguide", 《APPLIED PHYSICS LETTERS》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113470605A (en) * | 2021-06-10 | 2021-10-01 | 西安交通大学 | Continuously adjustable sound absorption structure |
| CN113470605B (en) * | 2021-06-10 | 2024-05-24 | 西安交通大学 | Continuously adjustable sound absorption structure |
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Application publication date: 20190524 |