CN206270056U - A kind of silencer transmission loss test system for aerodynamic noise - Google Patents
A kind of silencer transmission loss test system for aerodynamic noise Download PDFInfo
- Publication number
- CN206270056U CN206270056U CN201621236748.2U CN201621236748U CN206270056U CN 206270056 U CN206270056 U CN 206270056U CN 201621236748 U CN201621236748 U CN 201621236748U CN 206270056 U CN206270056 U CN 206270056U
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- China
- Prior art keywords
- silencer
- noise
- fan
- relief valve
- standing wave
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Exhaust Silencers (AREA)
Abstract
A kind of a kind of silencer transmission loss test system for aerodynamic noise, and in particular to system to the test of automobile intake and exhaust silencer aerodynamic noise acoustical absorptivity.Its device includes frequency conversion centrifugal fan, fan noise silencer, air flow sensor, air pressure probe, standing wave tube, microphone group, electrical air relief valve, relief valve silencer, analog/digital conversion plate, gain amplifier and computer.The utility model simple structure, easy to operate, accuracy are high, make up the blank to the transmission loss test of automobile air inlet system and exhaust system aerodynamic noise in prior art.
Description
Technical field
The utility model is related to car acpistocs performance test field, and in particular to a kind of silencer for aerodynamic noise is passed
Pass loss test system.
Background technology
With being skyrocketed through for car ownership, automobile noise pollution problem is increasingly severe, corresponding noise abatement act
Rule are also more and more stricter.Engine breathing noise is the noise source that automobile primary is wanted, and is to reduce using silencer rational in infrastructure
Vehicle noise is most effective, simplest approach.
It is the topmost function of silencer to eliminate noise, when a silencer element is designed, it is necessary to know that it specifically disappears
Sound effective value.Transmission loss is to weigh a most direct technical indicator of silencer acoustical absorptivity, and its definition is sound in microphone
The energy size lost in transmittance process.
Induction and exhaust noises complicated component, comprising engine combustion noise, mechanical noise, also intake and exhaust air-flow in the duct
The aerodynamic noise that flow at high speed is produced.Special testboard has been designed currently for engine combustion noise and mechanical noise
Frame, and the means of software sunykatuib analysis and entrucking test are also rested on for aerodynamic noise, lack a kind of simple and fast, repeat
The engine bench test means for carrying out.
The purpose of this utility model is to make up to transmit automobile air inlet system and exhaust system aerodynamic noise in prior art to damage
Lose the blank of test, there is provided a kind of simple structure, easy to operate, accuracy test device and method high.
Utility model content
The purpose of this utility model is to provide a kind of silencer transmission loss test system for aerodynamic noise, solves
Conventional apparatus many deficiencies in actual applications, its simple structure, measuring accuracy are high, easy to operate.
The technical solution of the utility model is：A kind of silencer transmission loss test system for aerodynamic noise, including
Frequency conversion centrifugal fan and upper and lower two sections of standing wave tubes and connecting fan outlet and epimere standing wave at connection silencer two ends to be measured
Fan noise silencer；The relief valve with relief valve silencer is provided between blower fan and fan noise silencer；Also include
The air flow sensor and air pressure probe that are arranged in epimere standing wave tube and it is arranged in upper and lower two sections of standing wave tubes
Microphone group.
Further：Also include the analog/digital conversion plate, gain amplifier and the computer that are electrically connected with successively, the analog
Change-over panel is also electrically connected with microphone group, air flow sensor and air pressure probe, the computer also with
Relief valve, blower fan are electrically connected.
Further：Also include the analog/digital conversion plate of the reception microphone group signal being electrically connected with successively, receive analog
Change the gain amplifier of partitioned signal and the computer of reception gain amplifier signal；Also include receive air flow sensor and
The output signal of air pressure probe simultaneously controls the sub-controller that relief valve and blower fan are operated.
Further：The fan noise silencer includes main pipeline, the perforate on main pipeline, divides the interior into
The dividing plate and high frequency noise elimination tank of some individual cavities.
The beneficial effects of the utility model are：Silencer transmission loss test system of the utility model for aerodynamic noise
And method, replace the flow and pressure in engine exhaust air-flow, and real-time adjustment test system using frequency conversion fan, it is pneumatic
Noise transmission loss provides the flow field of stabilization；Before and after the utility model is using silencer to be measured in microphone group test standing wave tube
Acoustic pressure, and according to standing-wave ratio method calculate transmission loss；The utility model simple structure, easy to operate, accuracy are high, make up
To the blank of automobile air inlet system and exhaust system aerodynamic noise transmission loss test in prior art, garage can be widely used in
The exploitation and performance evaluation of industry air inlet system and exhaust system, so as to improve the quality and the market competitiveness of product.
Brief description of the drawings
Fig. 1 is silencer transmission loss test system structure schematic diagram of the utility model for aerodynamic noise；
Fig. 2 is the fan noise acoustic wave filter structure figure in the utility model；
Fig. 3 is the standing wave tube cut-away view in the utility model；
Fig. 4 is method flow diagram of the utility model for the silencer transmission loss test of aerodynamic noise；
Fig. 5 is transmission loss test philosophy figure in the utility model；
Fig. 6 is that the microphone aerodynamic noise tested using the utility model transmits loss result curve；
Fig. 7 is silencer transmission loss test system another structural representation of the utility model for aerodynamic noise.
Number explanation in figure：1 is blower fan, 2 is fan noise silencer, 3 is air flow sensor, 4 is air pressure
Sensor, 5 be standing wave tube, 6 be silencer to be measured, 7 be microphone group, 8 be relief valve, 9 be relief valve silencer, 10 be mould/
Number change-over panels, 11 be gain amplifier, 12 be computer, 13 be sub-controller；201 be main pipeline, 202 be perforate, 203 be every
Plate 204 is high frequency noise elimination tank；501 is epimere standing wave tube, 502 is hypomere standing wave tube；Each microphone of 701-704 microphone groups.
Specific embodiment
1~7 pair of implementation method of the present utility model is described further below in conjunction with the accompanying drawings.
Embodiment 1：
A kind of silencer transmission loss test system for aerodynamic noise, as shown in figure 1, including frequency conversion centrifugal fan
1st, fan noise silencer 2, air flow sensor 3, air pressure probe 4, standing wave tube 5, silencer to be measured 6, microphone
Group 7, electrical air relief valve 8, relief valve silencer 9, analog/digital conversion plate 10, gain amplifier 11 and computer 12.Frequency conversion from
The inlet end of the air outlet connecting fan sound deadener 2 of core type blower fan 1；Electrical air relief valve 8 and relief valve silencer 9 are gone here and there
Connection is on the two bypass conduits of centrifugal fan 1；The outlet of the leading portion pipe one end connecting fan sound deadener 2 of standing wave tube 5
End, the other end connects the inlet end of silencer 6 to be measured；The one of the back segment pipe of the outlet side connection standing wave tube 5 of silencer to be measured 6
End；Air flow sensor 3 and air pressure probe 4 are arranged on inside the epimere pipe of standing wave tube 5, the connection of its signal output part
The signal input part of analog/digital conversion plate 10；Microphone group 7 is arranged in the middle of the special hole in standing wave tube 5, and its signal output part connects
Connect the signal input part of analog/digital conversion plate 10；The signal of the signal output part connection gain amplifier 11 of analog/digital conversion plate 10 is defeated
Enter end；The signal output part of gain amplifier 11 connects the signal input part of computer 12；The output end of computer 12 connects respectively
Connect the signal input part of frequency conversion centrifugal fan 1 and the signal input part of electrical air relief valve 8.
The air draught that frequency conversion centrifugal fan 1 in the present embodiment is used for required for producing test, and according to computer
12 instruction changes the flow and pressure of exit flow in real time.The maximum air flow of the frequency conversion centrifugal fan 1 in the present embodiment
It is 2500 kgs/hr to measure, and maximum outlet pressure is 50 kPas, can simulate the intake and exhaust of the engine of 1.5~2.0L of discharge capacity
Air-flow.
Fan noise silencer 2 in the present embodiment, for eliminating the noise produced by frequency conversion centrifugal fan 1.In it
Portion's structure is as shown in Fig. 2 including main pipeline 201, tube having holes 202, dividing plate 203 and high frequency noise elimination tank 204.Main pipeline 201 is disappearing
Arranged according to the lost formula of multistage inside sound device, play the effect of reactive muffling；Aperture on tube having holes 202 is arranged in certain sequence
High-frequency noises are played elimination effect by row；Dividing plate 203 will be separated into multiple independent cavitys inside silencer, be disappeared with strengthening
Acoustic efficiency；Acoustical cotton is housed in high frequency noise elimination tank 204, is used to eliminate main radio-frequency component in fan noise.
Air flow sensor 3 in the present embodiment, for monitoring the air mass flow in standing wave tube 5.
Air pressure probe 4 in the present embodiment, for monitoring the air pressure in standing wave tube 5.
Standing wave tube 5 in the present embodiment, for connecting silencer to be measured 6 and producing the plane standing-wave sound field of test.Its
Internal structure is as shown in figure 3, including epimere pipe 501 and hypomere pipe 502.2 microphone slots, 1 sky are left in epimere pipe 501
The signal line jack of mass-air-flow sensor 3 and 1 jack of air pressure probe 4；2 microphone slots are left in hypomere pipe 502.
The cut-off frequency requirement of frequency characteristic and standing wave theory according to silencer, the caliber for determining standing wave tube 5 is 30mm.
Microphone group 7 in the present embodiment, including 4 standards, 1/2 inch of microphone, it is fixed in standing wave tube 5 for testing
The sound pressure level of position.
Electrical air relief valve 8 in the present embodiment, for maintaining the pressure stability in standing wave tube 5.When air pressure is passed
When the air pressure of the monitoring of sensor 4 exceedes systemic presupposition value, computer 12 will send to specify makes the row of electrical air relief valve 8
Air valve opens pressure release.
Relief valve silencer 9 in the present embodiment, for eliminating air pressure relief noise.
Analog/digital conversion plate 10 in the present embodiment, using American National instrument（National Instruments）Data
The types of acquisition system NI 9234,
Analog voltage signal for sensor to be produced is converted to the recognizable data signal of computer 12.
Gain amplifier 11 in the present embodiment, from Texas Instrument（Texas Instruments）Input operation amplifier
Device TL084 types, for carrying out noise filtering and amplification to signal.
Computer 12 in the present embodiment, plays a part of controller, the data for collecting typing gain amplifier, and
Calculated according to the formula that prior art and the utility model are disclosed, unknown or undocumented program is not related to, for basis
Microphone group 7 collection sound pressure signal calculate transmission loss, and according to flow sensor 3 and pressure sensor 4 collection come stream
Amount and pressure signal control frequency conversion centrifugal fan 1 and electrical air relief valve 8 to maintain flow and pressure in standing wave tube 5 steady
It is fixed.
Embodiment 2：
The silencer transmission for aerodynamic noise in the present embodiment is lost test system and is with the difference of embodiment 1,
In addition to amplitude being carried out to each microphone and is demarcated, should also phase calibration be carried out to it, make 4 microphones in the stagnant of synchronization
Relief angle is equal to 0 so that they keep synchronous in phase, so that the sound pressure signal of microphone pick is more accurate, with maximum
The elimination measurement error of limit.
Embodiment 3：
The silencer transmission for aerodynamic noise in the present embodiment is lost test system and is with the difference of embodiment 1,
To ensure the precision and uniformity of test result, the temperature of test environment, humidity, atmospheric pressure level should keep stabilization, surrounding
Without electromagnetic interference and ambient noise should be less than 36 decibels.
Embodiment 4：
The silencer transmission for aerodynamic noise in the present embodiment is lost test system and is with the difference of embodiment 1,
When the engine displacement of silencer to be measured matching is less than 1.5L or more than 2.0L, the frequency conversion centrifugal fan of other specifications is selected
To provide suitable air mass flow and pressure.
Embodiment 5：
The silencer transmission for aerodynamic noise in the present embodiment is lost test system and is with the difference of embodiment 1,
As shown in fig. 7, being additionally provided with sub-controller 13, receive air flow sensor 3, the output signal of air pressure probe 4 and control
The operation of blower fan processed and relief valve.
The method of testing of the utility model structure, using any one device as described in embodiment 1-5, including following step
Suddenly：
Step 1:Silencer to be measured is fixed on stand, and front and rear section standing wave tube is connected the import of silencer respectively
End and the port of export；
Step 2：Start blower fan, Initialize installation is carried out to test system；
Step 3:Air mass flow and pressure in monitoring standing wave tube；
Step 4:Engine exhaust flow and pressure according to prior actually measured and input controller or computer is bent
Line, control blower fan and relief valve are with the flow and pressure in maintenance system；
Step 5:The sound pressure level of relevant position in test standing wave tube；Calculate transmission loss.
Preferably：Step 5 Computer sound pressure signal of microphone pick is carried out adding window noise reduction, weighted average,
After Fourier transformation treatment, the acoustic pressure spectrum signal of each sensor position is obtained, recycle standing-wave ratio method, by acoustic pressure frequently
Spectrum signal is decomposed into incident acoustic waveA, reflection sound waveB, transmitted acoustic pulseCWith secondary reflection sound waveD, and calculate silencer to be measured
Transmission loss.The silencer transmission loss result curve of test is exported in embodiment 1；As shown in fig. 6, being in test system mould
Under gas shock when sending out 3000 turns of motivation 2 grade, the aerodynamic noise transmission loss of silencer to be measured.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model is disclosed
Or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with the power
The protection domain that profit is required is defined.
Claims (4)
1. test system is lost in a kind of silencer transmission for aerodynamic noise, it is characterised in that：Including frequency conversion centrifugal fan
Fan noise with the outlet of upper and lower two sections of standing wave tubes and connecting fan and epimere standing wave that connect silencer two ends to be measured is eliminated the noise
Device；The relief valve with relief valve silencer is provided between blower fan and fan noise silencer；Also include being arranged on epimere standing wave
Air flow sensor and air pressure probe and the microphone group being arranged in upper and lower two sections of standing wave tubes in pipe.
2. test system is lost in the silencer transmission for aerodynamic noise according to claim 1, it is characterised in that：Also wrap
Include analog/digital conversion plate, gain amplifier and the computer being electrically connected with successively, the analog/digital conversion plate also with microphone group, sky
Mass-air-flow sensor and air pressure probe are electrically connected with, and the computer is also electrically connected with relief valve, blower fan.
3. test system is lost in the silencer transmission for aerodynamic noise according to claim 1, it is characterised in that：Also wrap
Include the analog/digital conversion plate for receiving microphone group signal, the gain amplifier of reception analog/digital conversion partitioned signal being electrically connected with successively
And the computer of reception gain amplifier signal；Also include receiving the output letter of air flow sensor and air pressure probe
Number and control relief valve and blower fan operating sub-controller.
4. test system is lost in the silencer transmission for aerodynamic noise according to claim 1, it is characterised in that：It is described
Fan noise silencer include main pipeline, the perforate on main pipeline, the dividing plate for dividing the interior into some individual cavities and
High frequency noise elimination tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621236748.2U CN206270056U (en) | 2016-11-18 | 2016-11-18 | A kind of silencer transmission loss test system for aerodynamic noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621236748.2U CN206270056U (en) | 2016-11-18 | 2016-11-18 | A kind of silencer transmission loss test system for aerodynamic noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206270056U true CN206270056U (en) | 2017-06-20 |
Family
ID=59040639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621236748.2U Expired - Fee Related CN206270056U (en) | 2016-11-18 | 2016-11-18 | A kind of silencer transmission loss test system for aerodynamic noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206270056U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
-
2016
- 2016-11-18 CN CN201621236748.2U patent/CN206270056U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN109141519B (en) * | 2018-07-11 | 2021-09-03 | 同济大学 | Test bench for testing acoustic and flow field characteristics of silencing element |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20170620 Termination date: 20211118 |