CN105023568A - Cooperative-spectrum sound wave eliminating cavity and damping method - Google Patents
Cooperative-spectrum sound wave eliminating cavity and damping method Download PDFInfo
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- CN105023568A CN105023568A CN201510437971.7A CN201510437971A CN105023568A CN 105023568 A CN105023568 A CN 105023568A CN 201510437971 A CN201510437971 A CN 201510437971A CN 105023568 A CN105023568 A CN 105023568A
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Abstract
The invention discloses a cooperative-spectrum sound wave eliminating cavity and a damping method and relates to the technical field of sound elimination. A sound wave elimination cavity includes a first sound wave channel and a second sound wave channel. The front ends of the first sound wave channel and the second sound wave channel are both sound inlets while the tail ends of the first sound wave channel and the second sound wave channel are combined together and form a damping cavity. The length difference of the first sound wave channel and the second sound wave channel equals to an integer multiple of wavelength of sound waves added with 1/2 wavelength. The outer surface of each of the first sound wave channel and the second sound wave channel is provided with a plurality of resonance cavities. The inner surface of each of the first sound wave channel and the second sound wave channel is provided with a sound absorbing film. Multiple layers of sound absorbing nets are arranged in the damping cavity. According to the invention, through integrating sound wave reflection, interference and diffraction principles and by changing travel difference of two sound waves from one sound source, sound wave intensity control and damping are realized in the damping cavity by sound wave interference. The cooperative-spectrum sound wave eliminating cavity and the damping method have characteristics of good sound insulation effect and large sound damping range.
Description
Technical field
The present invention relates to sound wave noise elimination technique field, specifically a kind of association frequency formula sound wave buries in oblivion chamber and sound reduction method.
Background technology
Due to object vibration produce sound wave need to control in a lot of occasion, reduce pollution from environmental noise, with guarantee produce, experiment normally carry out.Adopt absorption process in current every sound wave isolation and removing method, the method is requiring that high field conjunction is difficult to meet design requirement more.
Summary of the invention
For application demand and the deficiencies in the prior art, the invention provides a kind of association frequency formula sound wave and bury in oblivion chamber
And sound reduction method, more effectively can abate the noise, reduce and pollute.
The present invention realizes with following technical scheme: chamber is buried in oblivion by a kind of association frequently formula sound wave, comprises the first channel of acoustic wave and the second channel of acoustic wave; The front end of the first channel of acoustic wave and the second channel of acoustic wave is inlet sound mouth, and end combines and forms noise elimination cavity; The path length difference of the first channel of acoustic wave and the second channel of acoustic wave is that the integral multiple of wave length of sound adds 1/2 wavelength; The outside surface of the first channel of acoustic wave and the second channel of acoustic wave is provided with multiple resonator cavity, and the inside surface of the first channel of acoustic wave and the second channel of acoustic wave is equipped with sound absorbing membrane.
Adopt above-mentioned association frequency formula sound wave to bury in oblivion chamber, sound reduction method concrete steps are as follows:
(1) measure and need the predominant frequency of sound wave to be processed and frequency range, measure the energy range of sound wave, and then determine the size of the passage length difference of two propagation ducts and noise elimination cavity, resonator cavity;
(2) as required, association's frequency formula sound wave being buried in oblivion chamber is evenly arranged in sound wave elimination or isolated system;
(3), when waveform arrives at and assists frequency formula sound wave to bury in oblivion chamber, enter two propagation ducts simultaneously; Sound wave is in communication process, and first resonator cavity utilizes resonance effect to eliminate acoustic wave segment under the impact of waveform; In addition sound wave runs into after sound absorbing membrane is absorbed certain energy and is reflected back toward propagation ducts, continues forward direction;
(4) when noise elimination cavity is provided with sound absorption net: after sound wave enters noise elimination cavity, the sound wave of two passages is cancelled under interference effect; Sound wave in noise elimination cavity, runs into sound absorption net, and sound wave portion of energy is converted to the kinetic energy of sound absorption net, is again offset portion of energy; Continuation is transmitted by the sound wave of dump energy in cavity---to be absorbed---reflection---to interfere, until be totally consumed;
When noise elimination cavity is not provided with sound absorption net: after sound wave enters noise elimination cavity, the sound wave of two passages is cancelled under interference effect; Continuation is transmitted by the sound wave of dump energy in cavity---absorb---reflection---interference, until be totally consumed into.
Principle of work: the wave path-difference utilizing two channel of acoustic wave, is made the sound wave of final contact mutually be superposed by interference effect, realizing noise elimination object, being provided with damping mechanism (resonator cavity, sound absorbing membrane), for reducing noise elimination cavity load in propagation process of sound wave.
The invention has the beneficial effects as follows:
1) various structure space can be applied to;
2) eliminate audio frequency as required can customize;
3) elimination factor of sound wave can reach more than 60%;
4) particularly effective to the elimination of the sound wave eliminating particular frequency range.
Accompanying drawing explanation
fig. 1 is structural representation of the present invention;
Fig. 2 is workflow diagram schematic diagram of the present invention.
In figure: 1, resonator cavity, the 2, first channel of acoustic wave, 3, sound absorbing membrane, the 4, second channel of acoustic wave, 5, sound absorption net, 6, noise elimination cavity.
Embodiment
As shown in Figure 1, chamber is buried in oblivion by a kind of association frequently formula sound wave, comprises the first channel of acoustic wave 2 and the second channel of acoustic wave 4; The front end of the first channel of acoustic wave 2 and the second channel of acoustic wave 4 is inlet sound mouth, and end combines and forms noise elimination cavity 6; The path length difference of the first channel of acoustic wave and the second channel of acoustic wave is that the integral multiple of wave length of sound adds 1/2 wavelength; The inside surface that the outside surface that first sound wave leads to 2 roads and the second channel of acoustic wave 4 is provided with multiple resonator cavity 1, first channel of acoustic wave 2 and the second channel of acoustic wave 4 is equipped with sound absorbing membrane 3, is provided with multilayer sound absorption net 5 in noise elimination cavity 6.
In the present embodiment, wherein the second channel of acoustic wave 4 is horizontal acoustic waves passage, and the first channel of acoustic wave 2 is obliquely installed in end junction and the second channel of acoustic wave 4.
Described sound absorption net 5 adopts elastic body, for improving acoustical absorptivity.
Described sound absorbing membrane 3 adopts porous flexible body, for absorbing high-frequency audio frequency.
Described multiple resonator cavitys are arranged in the outside surface of first and second channel of acoustic wave uniformly, and resonator cavity is the damping mechanism of sound transmission, improve the decay in propagation process of sound wave.
As shown in Figure 2, a kind of association is formula sound wave sound reduction method frequently, and concrete steps are as follows:
(1) measure and need the predominant frequency of sound wave to be processed and frequency range, measure the energy range of sound wave, and then determine the size of the passage length difference of two propagation ducts and noise elimination cavity, resonator cavity;
(2) as required, association's frequency formula sound wave being buried in oblivion chamber is evenly arranged in sound wave elimination or isolated system;
(3), when waveform arrives at and assists frequency formula sound wave to bury in oblivion chamber, enter two propagation ducts simultaneously; Sound wave is in communication process, and first resonator cavity utilizes resonance effect to eliminate acoustic wave segment under the impact of waveform; In addition sound wave runs into after sound absorbing membrane is absorbed certain energy and is reflected back toward propagation ducts, continues forward direction;
(4) when noise elimination cavity is provided with sound absorption net: after sound wave enters noise elimination cavity, the sound wave of two passages is cancelled under interference effect; Sound wave in noise elimination cavity, runs into sound absorption net, and sound wave portion of energy is converted to the kinetic energy of sound absorption net, is again offset portion of energy; Continuation is transmitted by the sound wave of dump energy in cavity---to be absorbed---reflection---to interfere, until be totally consumed;
When noise elimination cavity is not provided with sound absorption net: after sound wave enters noise elimination cavity, the sound wave of two passages is cancelled under interference effect; Continuation is transmitted by the sound wave of dump energy in cavity---absorb---reflection---interference, until be totally consumed into.
The method composite sound wave reflection, interference and diffraction principle, by changing the path length difference of two homology sound waves, realize strength control and the noise elimination of sound wave in noise elimination cavity by interference effect.In wave traveling process, have a small amount of sound wave excessive from collection channel, this acoustic wave segment part can be eliminated by the resonance effect of resonator cavity, and some ripple then occurs interfering with the ripple just imported, thus is cancelled; Remainder from collect mouth escape backward protection direction opposite direction escape, elimination or the isolation design target of sound wave can not be affected.
Claims (7)
1. association's frequency formula sound wave buries in oblivion a chamber, it is characterized in that: comprise the first channel of acoustic wave and the second channel of acoustic wave; The front end of the first channel of acoustic wave and the second channel of acoustic wave is inlet sound mouth, and end combines and forms noise elimination cavity; The path length difference of the first channel of acoustic wave and the second channel of acoustic wave is that the integral multiple of wave length of sound adds 1/2 wavelength; The outside surface of the first channel of acoustic wave and the second channel of acoustic wave is provided with multiple resonator cavity, and the inside surface of the first channel of acoustic wave and the second channel of acoustic wave is equipped with sound absorbing membrane.
2. one association according to claim 1 frequency formula sound wave buries in oblivion chamber, it is characterized in that: in noise elimination cavity, be provided with multilayer sound absorption net.
3. one association according to claim 2 frequency formula sound wave buries in oblivion chamber, it is characterized in that: described sound absorption net adopts elastic body.
4. one association according to claim 1 frequency formula sound wave buries in oblivion chamber, and it is characterized in that: the second channel of acoustic wave is horizontal acoustic waves passage, the first channel of acoustic wave 2 is arranged in end junction and the second sound wave channel slopes.
5. one association according to claim 1 frequency formula sound wave buries in oblivion chamber, it is characterized in that: described sound absorbing membrane adopts porous flexible system to do.
6. one association according to claim 1 frequency formula sound wave buries in oblivion chamber, it is characterized in that: described multiple resonator cavitys are arranged in the outside surface of first and second channel of acoustic wave uniformly.
7. association's formula sound wave sound reduction method frequently, is characterized in that: adopt the frequency formula sound wave of the association described in any one of claim 1-6 to bury in oblivion chamber, concrete steps are as follows:
(1) measure and need the predominant frequency of sound wave to be processed and frequency range, measure the energy range of sound wave, and then determine the size of the passage length difference of two propagation ducts and noise elimination cavity, resonator cavity;
(2) as required, association's frequency formula sound wave being buried in oblivion chamber is evenly arranged in sound wave elimination or isolated system;
(3), when waveform arrives at and assists frequency formula sound wave to bury in oblivion chamber, enter two propagation ducts simultaneously; Sound wave is in communication process, and first resonator cavity utilizes resonance effect to eliminate acoustic wave segment under the impact of waveform; In addition sound wave runs into after sound absorbing membrane is absorbed certain energy and is reflected back toward propagation ducts, continues forward direction;
(4) when noise elimination cavity is provided with sound absorption net: after sound wave enters noise elimination cavity, the sound wave of two passages is cancelled under interference effect; Sound wave in noise elimination cavity, runs into sound absorption net, and sound wave portion of energy is converted to the kinetic energy of sound absorption net, is again offset portion of energy; Continuation is transmitted by the sound wave of dump energy in cavity---to be absorbed---reflection---to interfere, until be totally consumed;
When noise elimination cavity is not provided with sound absorption net: after sound wave enters noise elimination cavity, the sound wave of two passages is cancelled under interference effect; Continuation is transmitted by the sound wave of dump energy in cavity---absorb---reflection---interference, until be totally consumed into.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106448646A (en) * | 2016-10-21 | 2017-02-22 | 武汉市发源发明推广有限公司 | Adsorption-type wave absorber |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01236800A (en) * | 1988-03-16 | 1989-09-21 | Nippon Denso Co Ltd | Active silencer |
| US5001932A (en) * | 1989-06-22 | 1991-03-26 | General Dynamics Corporation | Ultrasonic squirter |
| CN102162387A (en) * | 2010-02-23 | 2011-08-24 | 简志坚 | Silencer |
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2015
- 2015-07-23 CN CN201510437971.7A patent/CN105023568A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01236800A (en) * | 1988-03-16 | 1989-09-21 | Nippon Denso Co Ltd | Active silencer |
| US5001932A (en) * | 1989-06-22 | 1991-03-26 | General Dynamics Corporation | Ultrasonic squirter |
| CN102162387A (en) * | 2010-02-23 | 2011-08-24 | 简志坚 | Silencer |
Non-Patent Citations (2)
| Title |
|---|
| 刘蛟龙: "汽车排气消声器性能的实验与仿真研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 毕嵘: "汽车进排气消声器性能的数值仿真研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106448646A (en) * | 2016-10-21 | 2017-02-22 | 武汉市发源发明推广有限公司 | Adsorption-type wave absorber |
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Application publication date: 20151104 |