CN109141519A - A kind of testboard bay tested for silencer element acoustics and flow field characteristic - Google Patents
A kind of testboard bay tested for silencer element acoustics and flow field characteristic Download PDFInfo
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- CN109141519A CN109141519A CN201810759480.8A CN201810759480A CN109141519A CN 109141519 A CN109141519 A CN 109141519A CN 201810759480 A CN201810759480 A CN 201810759480A CN 109141519 A CN109141519 A CN 109141519A
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- silencer element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The present invention relates to a kind of testboard bays tested for silencer element acoustics and flow field characteristic, including sequentially connected blower, air heater, diversion pipe, air flow meter, supervisor and tail end muffler, silencer element to be measured is mounted on the middle part of the supervisor, the air outlet of blower is equipped with multiple fan outlet noise mufflers, the front-end and back-end that supervisor middle part is located at silencer element to be measured are symmetrically arranged with for testing gas pressure, the test cell of gas temperature and noise, the front end of supervisor opens up branch pipe, one end of branch pipe is equipped with loudspeaker, testboard bay is equipped with controller, controller and loudspeaker, test cell, flow sensor connection.Compared with prior art, the present invention is by increasing controllable wind regime and air heater, adjust flow temperature, the transmitting loss and the pressure loss of silencer to be measured in the environment of stream and different temperatures can be measured, it can be used for transmitting automobile intake and exhaust silencer the measurement of loss with the pressure loss, device is compact, and versatility is preferable.
Description
Technical field
The present invention relates to industrial noise reductions, and in particular to a kind of testboard tested for silencer element acoustics and flow field characteristic
Frame
Background technique
With the continuous improvement that consumer requires car comfort, and automobile Induction and exhaust noises occupy in vehicle noise
Sizable specific gravity, and as engine develops and universal, the air inlet system and exhaust system noise of turbocharged engine to high speed
Shared ratio will increase, and in the measure of control Induction and exhaust noises, install its noise energy of silencer energy effective attenuation.
Currently, the silencer of all uses of air inlet system and exhaust system mainly include arrangement expansion silencer, Helmholtz silencer,
1/4 wavelength tube, perforation silencer etc., in actual design, due to its contour structures complexity, single theoretical calculation fails very well
Prediction its transmitting loss, from experimental viewpoint, two load methods can preferably predict silencer transmitting loss, measurement accurately may be used
It leans on.But tradition two does not carry in method experimental provision that there are the irreconcilable silencer caliber of microphone spacing and measurement supervisor calibers not
With the problem of, when actual test, needs the longer Preparatory work of experiment time.
From the point of view of current open source literature and related data, silencer transmitting loss and the pressure loss are to separate test,
It is difficult to ensure the consistency of experiment condition.In addition, have stream transmitting loss experimental stand under high-speed flow operating condition test error compared with
Greatly, and it will appear reproduced air-flow noise.Therefore, needing to develop at this stage a set of high-precision has silencer element under stream environment to transmit
Loss and pressure loss testboard bay mention for irregular multi-cavity broadband muffler acoustic characteristic and flow behavior prediction theory research
For experimental verification.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of consideration air-flow and temperature
The testboard bay of degree variation tested for silencer element acoustics and flow field characteristic.
The purpose of the present invention can be achieved through the following technical solutions: one kind being used for silencer element acoustics and flow field characteristic
The testboard bay of test, the testboard bay include sequentially connected blower, air heater, diversion pipe, air flow meter, supervisor
With tail end muffler, silencer element to be measured is mounted on the middle part of the supervisor, and the air outlet of the blower is equipped with multiple blowers and goes out
Mouth noise muffler, the front-end and back-end that the supervisor middle part is located at silencer element to be measured are symmetrically arranged with for testing gas pressure
The test cell of power, gas temperature and noise, the front end of the supervisor open up branch pipe, and one end of the branch pipe is equipped with loudspeaker,
The testboard bay is equipped with controller, and the controller is connect with loudspeaker, test cell, flow sensor.
Preferably, the quantity of the fan outlet noise muffler is at least 5.Multiple fan outlet noises are arranged to eliminate the noise
Device, the noise removal that blower can be generated, avoids the noise source to silencer element to be measured from having an impact.
The test cell includes gas gauge, temperature sensor and two microphones, and is located at silencer element to be measured
Two gas gauges of front-end and back-end are symmetrical arranged relative to silencer element to be measured, are located at silencer element front end to be measured with after
Two temperature sensors at end are symmetrical arranged relative to silencer element to be measured, positioned at four of silencer element front-end and back-end to be measured
Microphone is symmetrical arranged two-by-two relative to silencer element to be measured.
The controller includes data collector and the computer that connect with data collector, the data collector and gas
Body pressure gauge, temperature sensor, microphone, loudspeaker and air flow meter connection, the computer are connect with blower.
The blower is equipped with frequency converter, and the frequency converter is connect with computer.
The distance between two microphones positioned at the same test cell are adjustable, are 15~160mm.According to loudspeaking
The difference of the frequency for the noise that device issues, selects different spacing, specific as shown in table 1.
Effective frequency range under the different microphone spacing of table 1
| Microphone spacing/mm | Comprehensive effective band/Hz |
| 15 | [1133~4331] |
| 20 | [850~4331] |
| 25 | [680~4331] |
| 35 | [486~3886] |
| 40 | [425~3400] |
| 55 | [309~2472] |
| 60 | [283~2267] |
| 80 | [213~1700] |
| 100 | [170~1360] |
| 120 | [141~1133] |
| 140 | [121~971] |
| 160 | [106~850] |
The branch pipe be responsible for it is vertical connect, and be isolated in junction with film, to avoid the gas of high temperature and pressure to raising
The work of sound device has an impact.
The tail end muffler is echoless water conservancy diversion tail pipe, can guarantee that air-flow is uniform and stable while full sound absorption.
The working principle of testboard bay of the present invention is as follows:
Blower is located at initial end, and exit is connected with fan outlet noise muffler.Loudspeaker is located at branch pipe initial end, branch
Pipe is installed with supervisor's initial end at right angle.White noise is generated by loudspeaker.It is responsible for end and dismountable tail end silencer is housed,
This tail end silencer is an echoless water conservancy diversion tail pipe, can guarantee that air-flow is uniform and stable while full sound absorption.By dismounting nothing
Echo water conservancy diversion tail pipe realizes two different export boundary conditions, calculates for transmitting loss two load methods of measurement.It is responsible for front end
It is connected to air flow meter, connects data collecting instrument, and by computer, the frequency of automatic adjusument blower guarantees entire test
Air velocity inside rack pipeline is stablized in setting value.Two microphones are arranged before and after the tested silencer in the middle part of supervisor
Interface and a gas gauge interface, microphone measure sound pressure signal and are connected to data collecting instrument, before and after dismounting tail pipe
Data acquire twice, based on the available silencer element transmitting loss to be measured of two load methods.Gas gauge measures air pressure signal
It is similarly connected to data acquisition and analysis system, the pressure loss of real-time measurement silencer element.
Compared with prior art, the beneficial effects of the present invention are embodied in: by increasing controllable wind regime and air heater,
By adjusting flow temperature when experiment, the transmitting loss and pressure of silencer to be measured in the environment of stream and different temperatures can be measured
Loss can be used for transmitting automobile intake and exhaust silencer the measurement of loss with the pressure loss, and device is compact, and versatility is preferable.
Detailed description of the invention
Fig. 1 is connection schematic diagram of the invention；
Fig. 2 is the enlarged structure schematic diagram in the portion A in Fig. 1.
Wherein, 1 is frequency converter, and 2 be blower, and 3 be blast pipe, and 4 be air heater, and 5 be diversion pipe, and 6 be air mass flow
Meter, 7 be branch pipe, and 8 be supervisor, and 9 be loudspeaker, and 10 be tail end silencer, and 11 be gas gauge, and 12 be temperature sensor, 13
It is air cleaner for microphone, 14,15 be fan outlet noise damper, and 16 be computer, and 17 be data collecting instrument, and 18 are
Tested muffler.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
A kind of testboard bay tested for silencer element acoustics and flow field characteristic, structure is as shown in Figure 1 and Figure 2, including
Sequentially connected blower 2, air heater 4, diversion pipe 5, air flow meter 6, supervisor 8 and tail end muffler 10, noise reduction to be measured
Element 18 is mounted on the middle part of supervisor 8, and the air outlet of blower 2 is equipped with 5 fan outlet noise mufflers 15, position in supervisor 8
The test list for testing gas pressure, gas temperature and noise is symmetrically arranged in the front-end and back-end of silencer element 18 to be measured
Member, the front end for being responsible for 8 open up branch pipe 7, and one end of branch pipe 7 is equipped with loudspeaker 9, and testboard bay is equipped with controller, controller with raise
Sound device 9, test cell, flow sensor connection.Pass through air inlet between fan outlet noise muffler 15 and air heater 4
Pipe 3 connects, and the connection type between blast pipe 3 and air heater 4 is flanged joint, blast pipe 3, air heater 4, diversion pipe
5, identical flange-interface is used between air flow meter 6, supervisor 8.
Test cell includes gas gauge 11, temperature sensor 12 and microphone 13, and is located at silencer element to be measured
Two gas gauges 11 of 18 front-end and back-end are symmetrical arranged relative to silencer element 18 to be measured, are located at silencer element 18 to be measured
Two temperature sensors 12 of front-end and back-end are symmetrical arranged relative to silencer element 18 to be measured, before being located at silencer element 18 to be measured
Four microphones 13 of end and rear end are symmetrical arranged two-by-two relative to silencer element 18 to be measured.
Controller includes data collector 17 and the computer connecting with data collector 17 16, data collector 17 and gas
Body pressure gauge 11, temperature sensor 12, microphone 13, loudspeaker 9 and air flow meter 6 connect, and computer 16 and blower 2 connect
It connects.
Blower 2 is equipped with frequency converter 1, and frequency converter 1 is connect with computer 16, and the entrance facility air cleaner 14 of blower 2.
Branch pipe 7 is vertical with supervisor 8 to be connect, and is isolated in junction with film, to avoid high temperature and pressure gas to loudspeaking
The work of device 9 has an impact.Tail end muffler 10 is echoless water conservancy diversion tail pipe, can guarantee that air-flow is uniformly steady while full sound absorption
It is fixed.
Claims (8)
1. a kind of testboard bay tested for silencer element acoustics and flow field characteristic, which is characterized in that the testboard bay includes
Sequentially connected blower, air heater, diversion pipe, air flow meter, supervisor and tail end muffler, silencer element installation to be measured
At the middle part of the supervisor, the air outlet of the blower is equipped with multiple fan outlet noise mufflers, is located in the middle part of the supervisor
The front-end and back-end of silencer element to be measured are symmetrically arranged with for testing gas pressure, gas temperature and the test cell of noise, institute
The front end for stating supervisor opens up branch pipe, and one end of the branch pipe is equipped with loudspeaker, and the testboard bay is equipped with controller, the control
Device is connect with loudspeaker, test cell, flow sensor.
2. a kind of testboard bay tested for silencer element acoustics and flow field characteristic according to claim 1, feature
It is, the quantity of the fan outlet noise muffler is at least 5.
3. a kind of testboard bay tested for silencer element acoustics and flow field characteristic according to claim 1, feature
It is, the test cell includes gas gauge, temperature sensor and two microphones, and is located at silencer element front end to be measured
It is symmetrical arranged with two gas gauges of rear end relative to silencer element to be measured, positioned at silencer element front-end and back-end to be measured
Two temperature sensors are symmetrical arranged relative to silencer element to be measured, and four positioned at silencer element front-end and back-end to be measured are transaudient
Device is symmetrical arranged two-by-two relative to silencer element to be measured.
4. a kind of testboard bay tested for silencer element acoustics and flow field characteristic according to claim 3, feature
It is, the controller includes data collector and the computer that connect with data collector, the data collector and gas
Pressure gauge, temperature sensor, microphone, loudspeaker and air flow meter connection, the computer are connect with blower.
5. a kind of testboard bay tested for silencer element acoustics and flow field characteristic according to claim 4, feature
It is, the blower is equipped with frequency converter, and the frequency converter is connect with computer.
6. a kind of testboard bay tested for silencer element acoustics and flow field characteristic according to claim 3, feature
It is, it is adjustable in 15~160mm positioned at the distance between two described microphones of the same test cell.
7. a kind of testboard bay tested for silencer element acoustics and flow field characteristic according to claim 1, feature
It is, the branch pipe is vertical with supervisor to be connect, and is isolated in junction with film.
8. a kind of testboard bay tested for silencer element acoustics and flow field characteristic according to claim 1, feature
It is, the tail end muffler is echoless water conservancy diversion tail pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759480.8A CN109141519B (en) | 2018-07-11 | 2018-07-11 | Test bench for testing acoustic and flow field characteristics of silencing element |
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|---|---|---|---|
| CN201810759480.8A CN109141519B (en) | 2018-07-11 | 2018-07-11 | Test bench for testing acoustic and flow field characteristics of silencing element |
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| CN109141519A true CN109141519A (en) | 2019-01-04 |
| CN109141519B CN109141519B (en) | 2021-09-03 |
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Cited By (4)
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| CN110031239A (en) * | 2019-04-23 | 2019-07-19 | 吉林大学 | A kind of adjustable testing stand for automotive muffler performance test |
| CN112781846A (en) * | 2020-12-23 | 2021-05-11 | 盈普声学（惠州）有限公司 | Method for testing pressure drop and airflow regeneration noise of fireproof door and method for detecting fireproof door |
| CN113465895A (en) * | 2021-06-23 | 2021-10-01 | 武汉理工大学 | Engine exhaust system muffler transmission loss testing device and control method |
| CN113776650A (en) * | 2021-08-24 | 2021-12-10 | 同济大学 | Test bench for noise elimination element airflow regeneration noise |
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| CN112781846A (en) * | 2020-12-23 | 2021-05-11 | 盈普声学（惠州）有限公司 | Method for testing pressure drop and airflow regeneration noise of fireproof door and method for detecting fireproof door |
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