CN113776650A - Test bench for noise elimination element airflow regeneration noise - Google Patents
Test bench for noise elimination element airflow regeneration noise Download PDFInfo
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- CN113776650A CN113776650A CN202110973089.XA CN202110973089A CN113776650A CN 113776650 A CN113776650 A CN 113776650A CN 202110973089 A CN202110973089 A CN 202110973089A CN 113776650 A CN113776650 A CN 113776650A
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- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 230000008929 regeneration Effects 0.000 title claims abstract description 24
- 238000011069 regeneration method Methods 0.000 title claims abstract description 24
- 230000008030 elimination Effects 0.000 title claims abstract description 19
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 19
- 230000030279 gene silencing Effects 0.000 claims abstract description 23
- 230000003584 silencer Effects 0.000 claims abstract description 14
- 238000005452 bending Methods 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims 2
- 238000005259 measurement Methods 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention relates to a test bench for airflow regeneration noise of a noise elimination element, which comprises a fan (2), a pipeline silencer (3), a connecting pipe, an air inlet pipe (5), a flow guide pipe (6), a flowmeter, a main pipe (8) and the noise elimination element to be tested (10) which are sequentially connected, wherein a microphone (9) is arranged outside the outlet of the noise elimination element to be tested (10), the microphone (9) is connected with a data acquisition instrument (11), the fan (2) is connected with a frequency converter (1), and the frequency converter (1), the flowmeter and the data acquisition instrument (11) are all connected to a main controller. Compared with the prior art, the device can measure the airflow regeneration noise of the silencing element under different airflow flow rates, and has better structural space adaptability and higher precision.
Description
Technical Field
The invention relates to the technical field of industrial noise reduction, in particular to a test bench for airflow regenerative noise of a silencing element.
Background
With the adoption of turbochargers in more and more automobile engine systems, the noise problem of an air inlet system is more and more obvious, and the air inlet noise has the characteristics of wide frequency band and high amplitude. Conventional mufflers of intake systems, such as expanding mufflers, helmholtz mufflers, 1/4 wave tubes, etc., are not ideal for such noise, and their structures tend to be more and more complex due to the limited installation space of the engine compartment, such as irregular multi-cavity perforated mufflers. The silencer with a complex structure is easy to generate airflow regeneration noise under the condition of high-speed intake airflow.
From the present disclosure and related data, the conventional airflow regenerative noise test bench has the problems of complicated structure and noise interference of the device itself. Therefore, in the present stage, it is necessary to develop a set of high-precision testing stand for testing the airflow regeneration noise of the silencing element, so as to provide a testing tool for the airflow regeneration noise characteristic research of the irregular multi-cavity perforated silencer.
Disclosure of Invention
The present invention aims to overcome the defects of the prior art and provide a test bench for the airflow regeneration noise of a silencing element.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a test bench for noise elimination component air current noise regeneration, this test bench is including fan, pipeline silencer, connecting pipe, air-supply line, honeycomb duct, flowmeter, the person in charge and the noise elimination component that awaits measuring that connects gradually, the noise elimination component export of awaiting measuring set up the microphone outward, the microphone connect the data acquisition appearance, the fan connect the converter, flowmeter and data acquisition appearance all be connected to main control unit.
Preferably, at least 3 pipeline silencers are arranged and connected in sequence.
Preferably, at least one of the pipeline mufflers is a multi-cavity perforated wide-frequency muffler.
Preferably, the connecting pipe is a flexible hose.
Preferably, the bending angle range of the hose is 0-90 degrees.
Preferably, the length of the flow guide pipe is at least 20 times of the inner diameter of the flow meter.
Preferably, the flowmeter is a vortex shedding flowmeter.
Preferably, the plurality of microphones are arranged, and the distances between the plurality of microphones and the noise elimination element to be detected are different.
Preferably, the included angle between the connecting line of the microphone and the outlet center point of the to-be-detected silencing element and the axis of the to-be-detected silencing element is 45 degrees.
Preferably, the master controller comprises a computer.
Compared with the prior art, the invention has the following advantages:
(1) the invention reduces the noise generated by the fan and reduces the interference of measurement by arranging the pipeline silencer;
(2) the multi-cavity perforated broadband silencer improves the noise reduction effect and improves the measurement precision;
(3) the flexible connecting hose improves the space adaptability of the rack.
Drawings
FIG. 1 is a schematic structural diagram of a test bench for regenerating noise by airflow of a silencing element according to the present invention;
in the figure, 1 is a frequency converter, 2 is a fan, 3 is a pipeline silencer, 4 is a hose, 5 is an air inlet pipe, 6 is a flow guide pipe, 7 is a vortex street flowmeter, 8 is a main pipe, 9 is a microphone, 10 is a silencing element to be detected, 11 is a data acquisition instrument, and 12 is a computer.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Examples
As shown in fig. 1, the present embodiment provides a test bench for noise elimination element airflow regeneration noise, the test bench includes a fan 2, a pipeline muffler 3, a connecting pipe, an air inlet pipe 5, a flow guide pipe 6, a flow meter, a main pipe 8 and a noise elimination element 10 to be tested, a microphone 9 is arranged outside an outlet of the noise elimination element 10 to be tested, the microphone 9 is connected to a data acquisition instrument 11, the fan 2 is connected to a frequency converter 1, the flow meter and the data acquisition instrument 11 are all connected to a main controller, and the main controller includes a computer 12.
At least 3 pipeline silencers 3 are arranged and connected in sequence, and at least one of the pipeline silencers 3 is a multi-cavity perforated broadband silencer.
The connecting pipe is flexible hose 4, and the bending angle scope of hose 4 is 0 ~ 90.
The length of the flow guide pipe 6 is at least 20 times of the inner diameter of the flowmeter, and the flowmeter is a vortex shedding flowmeter 7.
The number of the microphones 9 is multiple, the distances between the multiple microphones 9 and the to-be-tested noise elimination element 10 are different, the included angle between the connecting line of the microphones 9 and the center point of the outlet of the to-be-tested noise elimination element 10 and the axis of the to-be-tested noise elimination element 10 is 45 degrees, and in the embodiment, the two microphones 9 are respectively 100mm and 1000mm away from the outlet of the to-be-tested noise elimination element 10.
The working principle of the test bench is as follows:
the fan 2 is positioned at the foremost end of the rack, and the outlet is connected with a pipeline silencer 3. The computer 12 receives the signal of the vortex flowmeter 7 and controls the frequency converter 1, and automatically controls the fan 2 through a program, so that the flow in the pipeline is constant, and the air flow can obtain low-noise air flow after passing through the pipeline silencer 3. The part of the air flow passes through the hose 4, the air inlet pipe 5 and the guide pipe 6, the guide pipe 6 which is long enough enables the air flow to be stable, and the accuracy of the measurement of the vortex shedding flowmeter 7 behind the guide pipe 6 is guaranteed. The air current enters the main pipe 8 and the silencing element 10 to be measured connected with the tail part of the main pipe 8 after passing through the vortex shedding flowmeter 7. The silencing element 10 to be tested generates airflow regeneration noise after passing through airflow and radiates outwards. Two microphones 9 at the outlet of the silencer receive the noise signal and transmit the noise signal to a data acquisition instrument 11 to obtain an airflow regeneration noise signal of the silencing element 10 to be tested.
According to the invention, the plurality of pipeline silencers 3 containing the multi-cavity perforated broadband silencer reduce the noise generated by the fan 2 and reduce the interference of measurement. Meanwhile, the flexible connecting hose 4 improves the space adaptability of the rack. The device can be used for measuring the airflow regeneration noise of the silencing element, can measure the airflow regeneration noise of the silencing element under different airflow flow rates, and has the advantages of good structural space adaptability and high precision.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. The utility model provides a test bench for noise elimination component air current regeneration noise, its characterized in that, this test bench is including fan (2), pipeline silencer (3), connecting pipe, air-supply line (5), honeycomb duct (6), flowmeter, the person in charge (8) that connect gradually and noise elimination component (10) that awaits measuring, noise elimination component (10) that awaits measuring export arrange microphone (9) outward, microphone (9) connect data acquisition appearance (11), fan (2) connect converter (1), flowmeter and data acquisition appearance (11) all be connected to main control unit.
2. A test bench for the airflow regeneration noise of silencing elements according to claim 1, characterized in that at least 3 of said pipe silencers (3) are provided and connected in series.
3. A test bench for noise regeneration of gas flow of silencing elements according to claim 1, characterized in that at least one of said pipe silencers (3) is a multi-chamber perforated broadband silencer.
4. A test bench for the airflow regeneration noise of silencing elements according to claim 1, characterized in that said connection pipe is a flexible hose (4).
5. A test bench for the airflow regeneration noise of silencing elements according to claim 4, characterized in that the bending angle of the hose (4) ranges from 0 to 90 °.
6. A test bench for the regeneration noise of the gas flow of a silencing element according to claim 1, characterized in that the length of said flow-guide tube (6) is at least 20 times the internal diameter of the flowmeter.
7. A test bench for the noise regeneration of a sound-damping element airflow according to claim 1, characterised in that the flowmeter is a vortex shedding flowmeter (7).
8. A test bench for the airflow regeneration noise of a silencing element according to claim 1, characterized in that said plurality of microphones (9) are provided, and the plurality of microphones (9) are at unequal distances from the silencing element (10) to be tested.
9. The test bench for the airflow regeneration noise of the silencing element according to claim 1, wherein the included angle between the connecting line of the microphone (9) and the central point of the outlet of the silencing element (10) to be tested and the axis of the silencing element (10) to be tested is 45 degrees.
10. A test bench for noise regeneration of a sound-damping element airflow according to claim 1, characterised in that the main controller comprises a computer (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110973089.XA CN113776650A (en) | 2021-08-24 | 2021-08-24 | Test bench for noise elimination element airflow regeneration noise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110973089.XA CN113776650A (en) | 2021-08-24 | 2021-08-24 | Test bench for noise elimination element airflow regeneration noise |
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| Publication Number | Publication Date |
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| CN113776650A true CN113776650A (en) | 2021-12-10 |
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| CN202110973089.XA Pending CN113776650A (en) | 2021-08-24 | 2021-08-24 | Test bench for noise elimination element airflow regeneration noise |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07295574A (en) * | 1994-04-27 | 1995-11-10 | Ricoh Co Ltd | Sound elimination device for information processing equipment |
| CN106383035A (en) * | 2016-11-18 | 2017-02-08 | 华晨汽车集团控股有限公司 | Muffler transmission loss testing system and muffler transmission loss testing method for aiming at aerodynamic noise |
| CN106837625A (en) * | 2017-01-09 | 2017-06-13 | 同济大学 | A kind of straight-through double-deck perforation silencer of multi-cavity for eliminating broadband noise |
| CN107490473A (en) * | 2017-08-31 | 2017-12-19 | 哈尔滨工程大学 | A kind of silencer test device based on gas flow temperature and flow matches |
| CN109141519A (en) * | 2018-07-11 | 2019-01-04 | 同济大学 | A kind of testboard bay tested for silencer element acoustics and flow field characteristic |
| CN110753841A (en) * | 2017-06-20 | 2020-02-04 | 阿克森斯公司 | Holding device for acoustic emitters in a sound spectrum system |
| CN113218498A (en) * | 2021-05-19 | 2021-08-06 | 北京中弘泰科科技有限公司 | Array type frequency meter based on CAN bus |
-
2021
- 2021-08-24 CN CN202110973089.XA patent/CN113776650A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07295574A (en) * | 1994-04-27 | 1995-11-10 | Ricoh Co Ltd | Sound elimination device for information processing equipment |
| CN106383035A (en) * | 2016-11-18 | 2017-02-08 | 华晨汽车集团控股有限公司 | Muffler transmission loss testing system and muffler transmission loss testing method for aiming at aerodynamic noise |
| CN106837625A (en) * | 2017-01-09 | 2017-06-13 | 同济大学 | A kind of straight-through double-deck perforation silencer of multi-cavity for eliminating broadband noise |
| CN110753841A (en) * | 2017-06-20 | 2020-02-04 | 阿克森斯公司 | Holding device for acoustic emitters in a sound spectrum system |
| CN107490473A (en) * | 2017-08-31 | 2017-12-19 | 哈尔滨工程大学 | A kind of silencer test device based on gas flow temperature and flow matches |
| CN109141519A (en) * | 2018-07-11 | 2019-01-04 | 同济大学 | A kind of testboard bay tested for silencer element acoustics and flow field characteristic |
| CN113218498A (en) * | 2021-05-19 | 2021-08-06 | 北京中弘泰科科技有限公司 | Array type frequency meter based on CAN bus |
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Application publication date: 20211210 |
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