CN106328118A - Sound attenuation device and method - Google Patents

Abstract

The invention discloses a sound attenuation device and method, and relates to the technical field of sound attenuation. The sound attenuation device comprises a signal collector, a bracket, a sound wave emitter and a feedback device, and is characterized in that the sound wave emitter and the bracket are connected through a sphere connecting structure; the bracket is of telescopic rod structure; the top end of the bracket is arranged inside the sound wave emitter, and the other end of the bracket is contacted with the ground; the signal collector is fixed at the top end of the bracket; the sound wave emitter is of a hollow hemispherical structure; and the feedback device is installed at the inner wall of the sound wave emitter. According to the invention, the sound wave emitter and a sound source differ a half-phase sound wave, and two sound waves are interacted and mutually cancelled out, thereby achieving an effect of sound attenuation in the propagation process. The sound attenuation device mainly based on an interference principle of sound waves, is good in sound attenuation effect, wide in sound attenuation frequency range and wide in application range.

Description

A kind of silencing apparatus and method

Technical field

The present invention relates to noise elimination technique field, refer more particularly to a kind of silencing apparatus and method.

Background technology

The sound wave produced due to object vibration needs to be controlled in a lot of occasions, reduces environmental noise pollution, with Guarantee produce, experiment normally carry out.The isolation of current every sound wave is the methods using porous material sound absorption with removing method more, The method is requiring that high field conjunction is difficult to satisfied design requirement.Therefore, how to control and reduce the pollution of noise and become and grind at present The focus studied carefully and problem demanding prompt solution.

Summary of the invention

It is an object of the invention to according to the deficiencies in the prior art, it is provided that a kind of silencing apparatus and method, it is possible to more Effectively abate the noise, reduce noise pollution.

The present invention is achieved by following technical solution:

A kind of silencing apparatus, including signal picker, support, pinger and feedback device；Described pinger It is connected by ball attachment structure with support；Described support is Telescopic rod structure；Described cantilever tip is placed in pinger, separately One end contacts with ground；And cantilever tip is fixed with signal picker；Described pinger is the hemispherical dome structure of hollow；Institute State, on pinger inwall, feedback device is installed.

Further, the inwall of the described pinger surface of emission is network structure.

Method based on silencing apparatus, comprises the steps:

S1, the detection sound intensity, by the sound intensity I at the sound-intensity measuring device detection sound source at sound source₁, utilize signals collecting The sound intersity measurement module detection sound source sound intensity I at silencing apparatus position of device₂；

Sound source decay calculation formula:

$\mathrm{\Δ}L=10lg\frac{1}{4{\mathrm{\πr}}^2}---\left(1\right)$

The sound intensity and acoustic pressure and the relational expression of the atmospheric density velocity of sound:

$I=\frac{p^2}{\mathrm{\ρ}c}---\left(2\right)$

The computing formula of sound pressure level:

$L_p=20lg\frac{p}{p_0}---\left(3\right)$

The computing formula of sound intensity level:

$L_I=10lg\frac{I}{I_0}---\left(4\right)$

Can draw according to formula 1,2,3,4:

$L_I=10lg\frac{I}{I_0}=10lg\frac{p^2}{{\mathrm{\ρcI}}_0}=10lg\frac{p^2}{{p_0}^2}+10lg\frac{{p_0}^2}{{\mathrm{\ρcI}}_0}=L_p+10lg\frac{400}{\mathrm{\ρ}c}=L_p---\left(5\right)$

Draw according to formula 5:

$\mathrm{\Δ}L={\mathrm{\ΔL}}_p={\mathrm{\ΔL}}_I=L_{I_2}-L_{I_1}---\left(6\right)$

According to formula 1,4,6

Draw:

In formula: L_I-sound intensity level, unit is W/m²；Lp-sound pressure level, unit Pa；ρ-atmospheric density, units/kg/m³；C-sound Speed, unit m/s；ρ c approximates value 400；Δ L-attenuation；ΔL_p-sound pressure level difference；ΔL_I-the sound intensity is differential；The sound intensity at sound source Level；The sound intensity level of signal picker position；P-acoustic pressure, unit Pa；p₀-reference sound pressure, unit Pa, value is 2 × 10^-5Pa；The I-sound intensity, unit W/m²；I₀-reference sound intensity, unit W/m², value 10^-12W/m²；R-signal picker and sound source Distance；

S2, the sound source position determined according to step S1, and receive according to the data acquisition module of signal picker and analyze The basic frequency of sound wave and frequency range at sound source, in order to eliminate basic frequency sound wave at sound source, regulate support height h, and rotate tune Joint ball attachment structure so that the surface of emission of pinger is just to sound source；

S3, Acoustic Signal Acquisition device are by the sound source information recorded by the wireless pinger that passes to, and pinger is sent out Penetrate with sound source same frequency but differ the sound wave of half phase place, thus offset the sound wave launched at sound source；

Sound wave after the detection noise elimination of S4, feedback device, if not up to soundproof effect, then feeds back to pinger, feedback Change to pinger and launch intensity of acoustic wave, until it reaches soundproof effect.

Further, the signal picker model in step S2 is RSM-SY7.

Further, the pinger in step S3 is DX series of acoustic emitter.

Further, in step S4, feedback device is piezoelectric type sonic sensor.

Beneficial effect:

1. by the sound intensity at detection sound source and the sound source sound intensity at silencing apparatus, permissible by sound source decay formula etc. Draw sound source particular location.

2. receive and analyze basic frequency and the frequency range of sound wave at sound source according to the data acquisition module of signal picker, In order to eliminate basic frequency sound wave at sound source, regulate support height h, rotate regulation ball attachment structure so that sending out of pinger Penetrate face just to sound source, utilize the principle of interference of sound wave to reach the effect eliminated the noise, thus preferably eliminate the noise.

3. the sound wave after feedback device detection is eliminated the noise, if not up to soundproof effect, then feeds back to pinger, feeds back to Pinger changes launches intensity of acoustic wave, until it reaches soundproof effect.

Accompanying drawing explanation

Fig. 1 is apparatus of the present invention structure member figures；

Fig. 2 is apparatus of the present invention structure member figures；

Fig. 3 is workflow schematic diagram of the present invention.

Reference is as follows:

1. signal picker；3. tighten nut；4. support；5. pinger；6. feedback device；7. ball attachment structure

Detailed description of the invention

For the present invention is further understood, it is described as follows in conjunction with accompanying drawing:

In conjunction with attached Fig. 1 and 2, a kind of silencing apparatus, including signal picker 1, support 4, pinger 5 and feedback device 6；Pinger 5 is connected by ball attachment structure 7 with support 4；Support 4 is Telescopic rod structure；By tightening nut 3, thus The height of regulation support 4, support 4 top is placed in pinger 5, and the other end contacts with ground；And support 4 top is fixed with Signal picker 1；Pinger 5 is the hemispherical dome structure of hollow；Feedback device 6 is installed, instead on pinger 5 inwall Feedback device 6 is piezoelectric type sonic sensor；

In conjunction with accompanying drawing 1,2,3: method based on silencing apparatus, comprise the steps: S1, the detection sound intensity, by near sound The sound intensity I at sound-intensity measuring device detection sound source at source₁, utilize the sound intersity measurement module detection sound source of signal picker 1 disappearing Sound intensity I at acoustic device position₂；

Sound source decay calculation formula:

$\mathrm{\Δ}L=10lg\frac{1}{4{\mathrm{\πr}}^2}---\left(1\right)$

The sound intensity and acoustic pressure and the relational expression of the atmospheric density velocity of sound:

$I=\frac{p^2}{\mathrm{\ρ}c}---\left(2\right)$

The computing formula of sound pressure level:

$L_p=20lg\frac{p}{p_0}---\left(3\right)$

The computing formula of sound intensity level:

$L_I=10lg\frac{I}{I_0}---\left(4\right)$

Can draw according to formula 1,2,3,4:

$L_I=10lg\frac{I}{I_0}=10lg\frac{p^2}{{\mathrm{\ρcI}}_0}=10lg\frac{p^2}{{p_0}^2}+10lg\frac{{p_0}^2}{{\mathrm{\ρcI}}_0}=L_p+10lg\frac{400}{\mathrm{\ρ}c}=L_p---\left(5\right)$

Draw according to formula 5:

$\mathrm{\Δ}L={\mathrm{\ΔL}}_p={\mathrm{\ΔL}}_I=L_{I_2}-L_{I_1}---\left(6\right)$

According to formula 1,4,6

Draw:

In formula: L_I-sound intensity level, unit is W/m²；Lp-sound pressure level, unit Pa；ρ-atmospheric density, units/kg/m³；C-sound Speed, unit m/s；ρ c approximates value 400；Δ L-attenuation；ΔL_p-sound pressure level difference；ΔL_I-the sound intensity is differential；The sound intensity at sound source Level；The sound intensity level of signal picker 1 position；P-acoustic pressure, unit Pa；p₀-reference sound pressure, unit Pa, value is 2 × 10^-5Pa；The I-sound intensity, unit W/m²；I₀-reference sound intensity, unit W/m², value 10^-12W/m²；R-signal picker 1 and sound source Distance；

S2, the sound source position determined according to step S1, and receive according to the data acquisition module of signal picker 1 and analyze The basic frequency of sound wave and frequency range at sound source, in order to eliminate basic frequency sound wave at sound source, regulate support height H, and rotate tune Joint ball attachment structure 7 so that the surface of emission of pinger 5 is just to sound source；

The sound source information recorded is passed through the wireless pinger 5 that passes to, pinger 5 by S3, Acoustic Signal Acquisition device 1 Launch with sound source same frequency but differ the sound wave of half phase place, thus offset the sound wave launched at sound source；

Sound wave after the detection noise elimination of S4, feedback device 6, if not up to soundproof effect, then feeds back to pinger 5, instead It is fed to pinger 5 and changes transmitting intensity of acoustic wave, until it reaches soundproof effect.

Wherein, signal picker 1 model in step S2 is RSM-SY7；Pinger 5 in step S3 is DX series Pinger；In step S4, feedback device 6 is piezoelectric type sonic sensor.

Described embodiment be the present invention preferred embodiment, but the present invention is not limited to above-mentioned embodiment, not In the case of deviating from the flesh and blood of the present invention, any conspicuously improved, the replacement that those skilled in the art can make Or modification belongs to protection scope of the present invention.

Claims (6)

1. a silencing apparatus, it is characterised in that include signal picker (1), support (4), pinger (5) and feedback dress Put (6)；Described pinger (5) is connected by ball attachment structure (7) with support (4)；Described support (4) is expansion link knot Structure；Described support (4) top is placed in pinger (5), and the other end contacts with ground；And support (4) top is fixed with letter Number harvester (1)；Described pinger (5) is the hemispherical dome structure of hollow；It is provided with on described pinger (5) inwall Feedback device (6).

Silencing apparatus the most according to claim 1, it is characterised in that the inwall of described pinger (5) surface of emission is Network structure.

3. according to the method based on silencing apparatus described in any one of claim 1 or 2, it is characterised in that comprise the steps: S1, the detection sound intensity, by the sound intensity I at the sound-intensity measuring device detection sound source at sound source₁, utilize signal picker (1) Sound intersity measurement module detection sound source sound intensity I at silencing apparatus position₂；

Sound source decay calculation formula:

$\mathrm{\Δ}L=10\lg \frac{1}{4{\mathrm{\πr}}^2}---\left(1\right)$

The sound intensity and acoustic pressure and the relational expression of the atmospheric density velocity of sound:

$I=\frac{p^2}{\mathrm{\ρ}c}---\left(2\right)$

The computing formula of sound pressure level:

$L_p=20\lg \frac{p}{p_0}---\left(3\right)$

The computing formula of sound intensity level:

$L_I=10\lg \frac{I}{I_0}---\left(4\right)$

Can draw according to formula 1,2,3,4:

$L_I=10\lg \frac{I}{I_0}=10\lg \frac{p^2}{{\mathrm{\ρcI}}_0}=10\lg \frac{p^2}{{p_0}^2}+10\lg \frac{{p_0}^2}{{\mathrm{\ρcI}}_0}=L_p+10\lg \frac{400}{\mathrm{\ρ}c}=L_p---\left(5\right)$

Draw according to formula 5:

$\mathrm{\Δ}L={\mathrm{\ΔL}}_p={\mathrm{\ΔL}}_I=L_{I_2}-L_{I_1}---\left(6\right)$

According to formula 1,4,6

Draw:

In formula: L_I-sound intensity level, unit is W/m²；Lp-sound pressure level, unit Pa；ρ-atmospheric density, units/kg/m³；The c-velocity of sound, single Position m/s；ρ c approximates value 400；Δ L-attenuation；ΔL_p-sound pressure level difference；ΔL_I-the sound intensity is differential；Sound intensity level at-sound source； The sound intensity level of-signal picker (1) position；P-acoustic pressure, unit Pa；p₀-reference sound pressure, unit Pa, value is 2 × 10^{- 5}Pa；The I-sound intensity, unit W/m²；I₀-reference sound intensity, unit W/m², value 10^-12W/m²；R-signal picker (1) and sound source away from From；

S2, the sound source position determined according to step S1, and receive according to the data acquisition module of signal picker (1) and analyze sound The basic frequency of sound wave and frequency range at source, in order to eliminate basic frequency sound wave at sound source, regulate support height H, and rotate regulation Ball attachment structure (7) so that the surface of emission of pinger (5) is just to sound source；

The sound source information recorded is passed to pinger (5), pinger by wireless by S3, Acoustic Signal Acquisition device (1) (5) launch with sound source same frequency but differ the sound wave of half phase place, thus offset the sound wave launched at sound source；

Sound wave after the detection noise elimination of S4, feedback device (6), if not up to soundproof effect, then feeds back to pinger (5), instead It is fed to pinger (5) and changes transmitting intensity of acoustic wave, until it reaches soundproof effect.

Method based on silencing apparatus the most according to claim 3, it is characterised in that the signal picker in step S2 (1) model is RSM-SY7.

Method based on silencing apparatus the most according to claim 3, it is characterised in that the pinger in step S3 (5) it is DX series of acoustic emitter.

Method based on silencing apparatus the most according to claim 3, it is characterised in that in step S4, feedback device (6) is Piezoelectric type sonic sensor.