CN203405342U - Sound eliminator sound eliminating performance testing device - Google Patents
Sound eliminator sound eliminating performance testing device Download PDFInfo
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- CN203405342U CN203405342U CN201320467564.7U CN201320467564U CN203405342U CN 203405342 U CN203405342 U CN 203405342U CN 201320467564 U CN201320467564 U CN 201320467564U CN 203405342 U CN203405342 U CN 203405342U
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Abstract
The utility model provides a sound eliminator sound eliminating performance testing device which comprises a simulation sound source unit, an impedance tube, a first acquisition unit, a second acquisition unit, a sound absorbing component and a data processing unit. The simulation sound source unit is arranged on a first end of the impedance tube. The first acquisition unit is used for acquiring a first sound signal before transmission of the first sound signal to a sound eliminator, and the first acquisition unit is arranged on one side, which is close to the simulation sound source unit, of the sound eliminator inside the impedance tube. The second acquisition unit is used for acquiring a second sound signal whose sound is eliminated by the sound eliminator. The second acquisition unit is arranged on one side, which is far from the simulation sound source unit, of the sound eliminator inside the impedance tube. The sound absorbing component is arranged on a second end of the impedance tube. The data processing unit is used for acquiring the first sound signal acquired by the first acquisition unit and the second sound signal acquired by the second acquisition unit, and obtaining a testing result according to the first sound signal and the second sound signal. The sound eliminator sound eliminating performance testing device is simple in structure, and sound eliminator sound eliminating performance can be tested without a whole vehicle so that waste of resources caused by late period repetitive tests is avoided, and thus the sound eliminator sound eliminating performance testing device is convenient to test.
Description
Technical field
The utility model relates to technical field of measurement and test, relates in particular to a kind of for testing the Sound Elimination Performance of Mufflers proving installation of Sound Elimination Performance of Mufflers.
Background technology
The exhaust noise of exhaust system is the larger ratio of occupation ratio in car load noise, is not having in engine or car load situation to exhaust system muffler low frequency noise elimination accurately carry out the waste that quantitative evaluation can be avoided the resource that later stage revision test causes.In prior art, for testing the complex structure of the proving installation of Sound Elimination Performance of Mufflers, test is inconvenient.And, because the operating characteristic of engine causes the main contributions frequency of noise below 1000Hz, and the frequency of source that current most testing apparatus is sent is higher, especially below 125Hz, the sound source of effective simulated exhaust system exhaust noise can not be provided, and the radiated noise of the sound source of buying on market is larger, can not meet in the acoustic attenuation performance test of exhaust silencer the requirement for neighbourhood noise.
Utility model content
The purpose of this utility model is to provide a kind of Sound Elimination Performance of Mufflers proving installation, and it is simple in structure, easy to operate, can in the situation that there is no car load, can accurately not test the acoustic attenuation performance of sound suppressor.
Technical scheme provided by the utility model is as follows:
A proving installation, comprising:
Can send the simulated sound source unit of the sound of simulated exhaust system noise;
Impedance tube, described simulated sound source unit is arranged at the first end of described impedance tube;
For gathering the first collecting unit that imports sound suppressor first sound tone signal before into, described the first collecting unit is arranged at close described simulated sound source unit one side of the sound suppressor in described impedance tube;
For gathering the second collecting unit of the second sound signal after sound suppressor is eliminated the noise, described the second collecting unit be arranged at sound suppressor in described impedance tube away from described simulated sound source unit one side;
Sound absorption parts, described sound absorption parts are arranged at the second end of described impedance tube; And,
The second sound signal gathering for obtaining first sound tone signal that described the first collecting unit gathers and described the second collecting unit, and according to described first sound tone signal and described second sound signal, obtain the data processing unit of a test result.
Preferably, described simulated sound source unit comprises:
For the first module of the first Sound control signal is provided;
Be connected with described the first module, for described the first Sound control signal is processed, to obtain the first data processing module of the second Sound control signal;
Be connected with described the first data processing module, for the power amplifier that described the second Sound control signal is carried out to power amplification; And,
Be connected with described power amplifier, for sending the audio amplifier of the sound of simulated exhaust system noise.
Preferably, a plurality of loudspeakers that can send different frequency sound that described audio amplifier comprises a casing and is arranged at described box house; Wherein, in the internal side wall of described casing, be coated with damping Seismic Isolation of Isolation Layer, and the inside of described casing is filled with silencing cotton.
Preferably, described damping Seismic Isolation of Isolation Layer is to be coated on the sidewall of described box house and to be formed by emulsified asphalt mixing wood powder.
Preferably, described casing consists of sheet material, and the thickness of described sheet material is more than or equal to 15mm.
Preferably, described impedance tube adopts the aluminum pipe of inner wall smooth, and the pipe thickness of described aluminum pipe is 10mm.
Preferably, described the first collecting unit comprises the first microphone and the second microphone being arranged on described impedance tube;
Described the second collecting unit comprises the 3rd microphone and the four-microphone being arranged on described impedance tube.
Preferably, described the first microphone, described the second microphone, described the 3rd microphone and described four-microphone all adopt 1/4 inch of pre-polarization free field measuring microphone.
The beneficial effects of the utility model are as follows:
Sound Elimination Performance of Mufflers proving installation provided by the utility model simple in structure, can in the situation that there is no car load, Sound Elimination Performance of Mufflers not made to initial judgement, avoid the waste of the resource that later stage revision test causes, during test, sound suppressor is placed in impedance tube, and make sound suppressor between the first collecting unit and the second collecting unit, can obtain a test result, convenient test.
Accompanying drawing explanation
Fig. 1 represents the structural representation of Sound Elimination Performance of Mufflers proving installation provided by the utility model;
Embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figure 1, the utility model provides a kind of Sound Elimination Performance of Mufflers proving installation, and it comprises:
Can send the simulated sound source unit 100 of the sound of simulated exhaust system noise;
For gathering the first collecting unit 300 that imports sound suppressor 10 first sound tone signal before into, described the first collecting unit 300 is arranged at close described simulated sound source unit 100 1 sides of the sound suppressor 10 in described impedance tube 200;
For gathering the second collecting unit 400 of the second sound signal after sound suppressor 10 is eliminated the noise, described the second collecting unit 400 be arranged at sound suppressor 10 in described impedance tube 200 away from described simulated sound source unit 100 1 sides;
The second sound signal gathering for obtaining first sound tone signal that described the first collecting unit 300 gathers and described the second collecting unit 400, and according to described first sound tone signal and described second sound signal, obtain the data processing unit of a test result.
In such scheme, during test, sound suppressor 10 is placed in impedance tube 200, simulated sound source unit 100 sends the sound of simulated exhaust system noise, sound is in the interior propagation of impedance tube 200, and after sound suppressor 10 is eliminated the noise, sound absorption parts 500 places that the are transmitted to impedance tube 200 second ends parts 500 that absorbed sound absorb, to prevent that sound is back to sound suppressor 10, the first collecting unit 300 and the second collecting unit 400 collect respectively and import sound suppressor 10 first sound tone signal and the second sound signal after sound suppressor 10 is eliminated the noise before into, and feed back to data processing unit, data processing unit is processed first sound tone signal and second sound signal, obtain a test result, according to the acoustic attenuation performance of the known sound suppressor 10 of this test result, whether meet the demands.
In the present embodiment, preferred, described simulated sound source unit 100 comprises:
For the first module of the first Sound control signal is provided;
Be connected with described the first module, for described the first Sound control signal is processed, to obtain the first data processing module of the second Sound control signal;
Be connected with described the first data processing module, for the power amplifier 101 that described the second Sound control signal is carried out to power amplification; And,
Be connected with described power amplifier 101, for sending the audio amplifier 102 of the sound of simulated exhaust system noise.
In such scheme, as shown in Figure 1, for the first module of the first Sound control signal is provided, can be computing machine 103, this computing machine 103 be supported USB sound cards, can plug and play; The first data processing module can adopt a data acquisition unit 104, and this data acquisition unit 104 adopts USB interface, and kernel is standard USB specialty sound card, and ICP feed circuit, can provide direct current supply, and it is connected with computing machine 103 by USB line; Power amplifier 101 can be to adopt two-way power amplifier 101, and for fear of the phenomenon that occurs " high load with small power ", the rated power of power amplifier 101 is 1.5 times of the audio amplifier 102 interior rated powers of loudspeaker preferably.
In the present embodiment, preferably, a plurality of loudspeakers that can send different frequency sound that described audio amplifier 102 comprises a casing and is arranged at described box house, wherein, loudspeaker can be selected applicable loudspeaker as required, because automobile exhaust system frequency ratio is lower at 20-1000HZ, can adopt woofer and Squawker to mix to be loaded on and in casing, meet frequency requirement, and according to the casing of the parameter of loudspeaker and recommended value making suitable dimension, preferably, described casing adopts the sheet materials such as multilayer board or senior log to make, more than sheet metal thickness is controlled at 15mm.
And, preferred, in the internal side wall of described casing, be coated with damping Seismic Isolation of Isolation Layer.Preferably, described damping Seismic Isolation of Isolation Layer is to be coated on the sidewall of described box house and to be formed by emulsified asphalt mixing wood powder, not only can increase casing rigidity but also can increase tank surface damping, and wood powder can prevent that acoustic reflection from causing source sound impure.
In addition, the inside of described casing is filled with silencing cotton (swollen yarn is cotton), can fully absorb the radiated noise that loudspeaker rear portion produces.
In addition, in the present embodiment, preferred, described impedance tube 200 adopts the aluminum pipe of inner wall smooths, and the internal diameter of aluminum pipe can customize as required, and the pipe thickness of described aluminum pipe 10mm preferably.
In addition,, in the present embodiment, preferred, described the first collecting unit 300 comprises the first microphone 301 and the second microphone 302 being arranged on described impedance tube 200; Described the second collecting unit 400 comprises the 3rd microphone 303 and the four-microphone 304 being arranged on described impedance tube 200.Adopt such scheme, by microphone collection, import sound suppressor 10 first sound tone signal and the second sound signal after sound suppressor 10 is processed before into.
Preferably, described the first microphone 301, described the second microphone 302, described the 3rd microphone 303 and described four-microphone 304 all adopt 1/4 inch of pre-polarization free field measuring microphone, adopt ICP power supply, frequency of operation is at 20HZ-10KHZ, and the spacing between the first microphone 301, described the second microphone 302, described the 3rd microphone 303 and described four-microphone 304 should meet and is greater than wavelength of sound 5%.In addition,, in order to suppress nonplanar wave impact, the distance between described the first microphone 301, described the second microphone 302, described the 3rd microphone 303 and described four-microphone 304 and audio amplifier 102 should be greater than three times of impedance tube 200 calibers.In addition, the putting hole inside of each microphone has duroplasts overcoat protection microphone to avoid vibrating and working the mischief suddenly, and the outside duroplasts overcoat that adopts, plays fixedly microphone and sound insulation effect.
In addition, in the present embodiment, the preferred cotton pipe of populated noise elimination that adopts of sound absorption parts 500, the sound frequency that tube length can absorb is as required adjusted.
In addition, in the present embodiment, described sound suppressor 10 acoustic attenuation performance proving installations also comprise a calibrating device, and calibrating device can produce the continuous sine wave of 1000HZ94dB acoustic pressure, for microphone is calibrated.
It should be noted that in addition, in the present embodiment, as shown in Figure 1, described the first data processing module and described data processing unit can be integrated on a data acquisition unit 104.This data acquisition unit 104 has a USB interface, an input end and 4 output terminals, and wherein said USB interface is for being connected with computing machine 103, and input end is connected with power amplifier 101, and 4 output terminals connect respectively four microphones.
It is more than preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. a Sound Elimination Performance of Mufflers proving installation, is characterized in that, comprising:
Can send the simulated sound source unit of the sound of simulated exhaust system noise;
Impedance tube, described simulated sound source unit is arranged at the first end of described impedance tube;
For gathering the first collecting unit that imports sound suppressor first sound tone signal before into, described the first collecting unit is arranged at close described simulated sound source unit one side of the sound suppressor in described impedance tube;
For gathering the second collecting unit of the second sound signal after sound suppressor is eliminated the noise, described the second collecting unit be arranged at sound suppressor in described impedance tube away from described simulated sound source unit one side;
Sound absorption parts, described sound absorption parts are arranged at the second end of described impedance tube; And,
The second sound signal gathering for obtaining first sound tone signal that described the first collecting unit gathers and described the second collecting unit, and according to described first sound tone signal and described second sound signal, obtain the data processing unit of a test result.
2. Sound Elimination Performance of Mufflers proving installation according to claim 1, is characterized in that,
Described simulated sound source unit comprises:
For the first module of the first Sound control signal is provided;
Be connected with described the first module, for described the first Sound control signal is processed, to obtain the first data processing module of the second Sound control signal;
Be connected with described the first data processing module, for the power amplifier that described the second Sound control signal is carried out to power amplification; And,
Be connected with described power amplifier, for sending the audio amplifier of the sound of simulated exhaust system noise.
3. Sound Elimination Performance of Mufflers proving installation according to claim 2, is characterized in that,
A plurality of loudspeakers that can send different frequency sound that described audio amplifier comprises a casing and is arranged at described box house; Wherein, in the internal side wall of described casing, be coated with damping Seismic Isolation of Isolation Layer, and the inside of described casing is filled with silencing cotton.
4. Sound Elimination Performance of Mufflers proving installation according to claim 3, is characterized in that,
Described damping Seismic Isolation of Isolation Layer is to be coated on the sidewall of described box house and to be formed by emulsified asphalt mixing wood powder.
5. Sound Elimination Performance of Mufflers proving installation according to claim 3, is characterized in that,
Described casing consists of sheet material, and the thickness of described sheet material is more than or equal to 15mm.
6. Sound Elimination Performance of Mufflers proving installation according to claim 1, is characterized in that,
Described impedance tube adopts the aluminum pipe of inner wall smooth, and the pipe thickness of described aluminum pipe is 10mm.
7. Sound Elimination Performance of Mufflers proving installation according to claim 1, is characterized in that,
Described the first collecting unit comprises the first microphone and the second microphone being arranged on described impedance tube;
Described the second collecting unit comprises the 3rd microphone and the four-microphone being arranged on described impedance tube.
8. Sound Elimination Performance of Mufflers proving installation according to claim 7, is characterized in that,
Described the first microphone, described the second microphone, described the 3rd microphone and described four-microphone all adopt 1/4 inch of pre-polarization free field measuring microphone.
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| CN201320467564.7U CN203405342U (en) | 2013-08-01 | 2013-08-01 | Sound eliminator sound eliminating performance testing device |
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| CN201320467564.7U CN203405342U (en) | 2013-08-01 | 2013-08-01 | Sound eliminator sound eliminating performance testing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2652139C1 (en) * | 2017-03-13 | 2018-04-25 | Олег Савельевич Кочетов | Method of acoustic testing of sound absorbers with resonant elements |
| CN108535018A (en) * | 2018-04-12 | 2018-09-14 | 天津职业技术师范大学 | A kind of internal combustion engine exhaust silencer case noise radiation test system |
| CN109324119A (en) * | 2018-09-13 | 2019-02-12 | 哈尔滨工程大学 | Muffler Performance test experiments pipeline section |
| CN110823615A (en) * | 2019-10-16 | 2020-02-21 | 中国人民解放军92578部队 | Performance test evaluation system for active and passive composite muffler of ventilation pipeline |
| CN113049208A (en) * | 2021-04-07 | 2021-06-29 | 上海应用技术大学 | Analog noise absorbing device |
| CN114813193A (en) * | 2022-05-20 | 2022-07-29 | 连云港观旭电力节能设备有限公司 | Method and system for testing silencer based on silencing testing device |
-
2013
- 2013-08-01 CN CN201320467564.7U patent/CN203405342U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2652139C1 (en) * | 2017-03-13 | 2018-04-25 | Олег Савельевич Кочетов | Method of acoustic testing of sound absorbers with resonant elements |
| CN108535018A (en) * | 2018-04-12 | 2018-09-14 | 天津职业技术师范大学 | A kind of internal combustion engine exhaust silencer case noise radiation test system |
| CN109324119A (en) * | 2018-09-13 | 2019-02-12 | 哈尔滨工程大学 | Muffler Performance test experiments pipeline section |
| CN110823615A (en) * | 2019-10-16 | 2020-02-21 | 中国人民解放军92578部队 | Performance test evaluation system for active and passive composite muffler of ventilation pipeline |
| CN113049208A (en) * | 2021-04-07 | 2021-06-29 | 上海应用技术大学 | Analog noise absorbing device |
| CN113049208B (en) * | 2021-04-07 | 2023-09-15 | 上海应用技术大学 | Analog noise absorbing device |
| CN114813193A (en) * | 2022-05-20 | 2022-07-29 | 连云港观旭电力节能设备有限公司 | Method and system for testing silencer based on silencing testing device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 Termination date: 20200801 |