CN108716985A - A kind of sound source modeling test device - Google Patents
A kind of sound source modeling test device Download PDFInfo
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- CN108716985A CN108716985A CN201810289432.7A CN201810289432A CN108716985A CN 108716985 A CN108716985 A CN 108716985A CN 201810289432 A CN201810289432 A CN 201810289432A CN 108716985 A CN108716985 A CN 108716985A
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- sound source
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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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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention relates to automobile exhaust muffler technical field of measurement and test, specifically disclose a kind of sound source modeling test device, wherein the sound source modeling test device includes：Air blower, resistive absolute silencer, sound source case, anechoic room, control device and harvester, the air blower is connected with the entrance of the resistive absolute silencer, the entrance of the sound source case is connected with the outlet of the resistive absolute silencer, the outlet of the sound source case is connect with the entrance of the anechoic room, test noise elimination exemplar and microphone are provided in the anechoic room, the harvester is connected with the microphone, loudspeaker are provided in the sound source case, the control device is connected with the loudspeaker and the harvester respectively.Sound source modeling test device provided by the invention considers the influence of engine, air-flow, improves the verifying speed of anti-acoustic capability.
Description
Technical field
The present invention relates to automobile exhaust muffler technical field of measurement and test more particularly to a kind of sound source modeling test devices.
Background technology
The NVH performance tests of automobile exhaust muffler at present such as insertion loss test, idle noise test, acceleration noise are surveyed
Examination etc. relies primarily on engine pedestal cooperation anechoic room and completes or completed directly in vehicle rotating drum experiments room test.Although real
Testing accuracy can ensure, but experimental cost is high, experimental period is long, and often be restricted by engine shortage of resources.Especially
Be vehicle rotating drum experiments room cost it is very high, many enterprises do not have test condition.Therefore, rack and vehicle rotary drum are uncomfortable
Close development phase need it is a large amount of carry out option screenings, quickly test and low testing cost requirement.And presently, there are some letter
Easy Test platform can only then use white noise sound source to carry out silencer and transmit the test of loss, and can not consider engine, air-flow
Influence.
Therefore, test hardware resource it is very short in the case of, how to provide a kind of sound source modeling test device with
Become those skilled in the art's technology urgently to be resolved hurrily in the NVH performance tests and research of automobile exhaust muffler development phase to ask
Topic.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art, a kind of sound source modeling test dress is provided
It sets, to solve the problems of the prior art.
As one aspect of the present invention, a kind of sound source modeling test device is provided, wherein the sound source modeling test dress
Set including：Air blower, resistive absolute silencer, sound source case, anechoic room, control device and harvester,
The air blower is connected with the entrance of the resistive absolute silencer, the entrance of the sound source case and described resistive is absolutely disappeared
The outlet of sound device connects, and the outlet of the sound source case is connect with the entrance of the anechoic room, and test is provided in the anechoic room
With noise elimination exemplar and microphone, the harvester is connected with the microphone, and loudspeaker, the control are provided in the sound source case
Device processed is connected with the loudspeaker and the harvester respectively,
The air blower can provide different in flow rate and flow air-flow, the resistive absolute noise elimination according to different measurement conditions
The noise that device can generate the air blower is eliminated, and the loudspeaker can send out survey under the control of the control device
Each noise like needed is tried, each noise like that the air-flow and the loudspeaker are sent out enters described disappear by the sound source case
Sound chamber, the test can eliminate the noise to the air-flow with each noise like with noise elimination exemplar, and the microphone can acquire institute
The sound after test noise elimination exemplar is eliminated the noise is stated, and collected sound can be sent to the harvester, the acquisition
The sound can be sent to the control device by device, and the control device can divide the collected sound
Analysis, to obtain the noise elimination analysis result of the test noise elimination exemplar.
Preferably, the sound source modeling test device further includes connecting tube, and the connecting tube is located at the air blower and institute
Between stating resistive absolute silencer, the connecting tube can be by the outlet of the air blower and entering for the resistive absolute silencer
Mouth connection.
Preferably, the sound source modeling test device further includes flow control valve, and the flow control valve is arranged described
The air flow outlet of air blower, the flow control valve can adjust the uninterrupted for the air-flow that the air blower provides.
Preferably, the sound source modeling test device further includes pipeline fluid measuring device, and the pipeline fluid measures dress
It installs in the connecting tube between the air blower and the resistive absolute silencer, the pipeline fluid measuring device can
Measure the pressure, temperature and flow of the air-flow in the connecting tube.
Preferably, the sound source modeling test device further includes that the first connecting flange, the second connecting flange are connected with third
Flange, first connecting flange are arranged in the inlet of the resistive absolute silencer, and first connecting flange can incite somebody to action
The entrance of the resistive absolute silencer is connect with the connecting tube, and second connecting flange setting resistive absolutely disappears described
The exit of sound device, second connecting flange can connect the resistive absolute silencer with the sound source case, and described
Three connecting flanges are located in the anechoic room, and the third connecting flange can disappear the outlet of the sound source case with positioned at described
The indoor test of sound is connected with noise elimination exemplar.
Preferably, the resistive absolute silencer include inlet flange, air inlet pipe, sound attenuation hole pipe, noise elimination cotton, silencer pad,
Outer barrel, interior punching cylinder, escape pipe and outlet flange, the inlet flange is arranged in the inlet of the air inlet pipe, described
Inlet flange is connect with first connecting flange, and the air inlet pipe is connected with the sound attenuation hole pipe, the sound attenuation hole pipe and institute
Escape pipe connection is stated, the exit of the escape pipe connects the outlet flange, the outlet flange and second connection method
Orchid connection, the noise elimination cotton are arranged around the sound attenuation hole pipe, and the interior punching cylinder is circumferentially positioned at the outer of the noise elimination cotton
Side, the outer barrel are set in the outside of the interior punching cylinder, and silencer pad setting is in the interior punching cylinder and described
Between outer barrel.
Preferably, the sound source case includes sound source case inlet flange, sound source case air inlet pipe, sound source case outer case, sound source case
Punching babinet, sound source case escape pipe and sound source case outlet flange, the sound source case outer case are arranged described in silencer pad, sound source case
The outside of punching babinet in sound source case, the sound source case silencer pad, which is located in the sound source case, to punch outside babinet and the sound source case
Between babinet, for the sound source box-shaped at hollow cavity, the cavity includes arrival end and outlet end, the sound source case air inlet method
The blue entrance with the sound source case air inlet pipe is connect, and the sound source case inlet flange is connect with second connecting flange, described
Sound source case air inlet pipe is connect with the arrival end, and the outlet end connects the sound source case escape pipe, the sound source case escape pipe
Outlet and the sound source case outlet flanged joint, the sound source case outlet flange connect with the third connecting flange.
Preferably, the sound source modeling test device further includes power amplifier, the input terminal of the power amplifier with
The control device connection, the output end of the power amplifier are connect with the loudspeaker, and the power amplifier can be by institute
State control device send out test need each noise like be amplified.
Preferably, two loudspeaker are set in the sound source case, and two loudspeaker are symmetrically fixed in the sound source case
On partition board, two loudspeaker are connect with the output end of the power amplifier, and two microphones are arranged in the anechoic room.
Preferably, the harvester includes data collection and analysis instrument.
Sound source modeling test device provided by the invention controls all kinds of the making an uproar that loudspeaker send out test needs by control device
Sound, the test for matching the anti-acoustic capability of engine for carrying out silencer, improves the verifying speed of anti-acoustic capability, makes eliminate the noise early period
The limitation of engine shortage is broken away from the research of device NVH, while can realize a large amount of design schemes screening of development phase.In addition,
Sound source modeling test device provided by the invention provides air-flow using air blower, and air flow rate is easy to adjust, and control is accurate, leads to
It is good with property.And the sound source modeling test device that provides of invention generates when eliminating air blower work using resistive absolute silencer
Some mechanical vibration noise and whole high-frequency air flow noises；Test sample, which is placed directly in an anechoic room, completes final noise
Performance test, anechoic room can exclude the influence of air blower and ambient noise to test to the greatest extent.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, an and part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of sound source modeling test device provided by the invention.
Fig. 2 is the concrete structure schematic diagram of resistive absolute silencer provided by the invention.
Fig. 3 is the concrete structure schematic diagram of sound source case provided by the invention.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific implementation mode stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
As one aspect of the present invention, a kind of sound source modeling test device is provided, wherein as shown in Figure 1, the sound source
Simulating test device includes：Air blower 1, resistive absolute silencer 6, sound source case 9, anechoic room 13, control device 16 and acquisition dress
Set 15,
The air blower 1 is connected with the entrance of the resistive absolute silencer 6, the entrance of the sound source case 9 and it is described it is resistive absolutely
Outlet connection to silencer 6, the outlet of the sound source case 9 is connect with the entrance of the anechoic room 13, in the anechoic room 13
It is provided with test noise elimination exemplar 11 and microphone 12, the harvester 15 and the microphone 12 connect, the sound source case 9
Loudspeaker 8 are inside provided with, the control device 16 is connected with the loudspeaker 8 and the harvester 15 respectively,
The air blower 1 can provide different in flow rate and flow air-flow according to different measurement conditions, described resistive absolutely to disappear
The noise that sound device 6 can generate the air blower 1 is eliminated, and the loudspeaker 8 can be in the control of the control device 16
Under send out test need each noise like, each noise like that the air-flow and the loudspeaker 8 are sent out by the sound source case 9 into
Enter to the anechoic room 13, the test can eliminate the noise to the air-flow with each noise like with noise elimination exemplar 11, the wheat
Gram wind 12 can acquire the sound after the test noise elimination exemplar 11 is eliminated the noise, and can be sent to collected sound described
The sound can be sent to the control device 16,16 energy of the control device by harvester 15, the harvester 15
It is enough that the collected sound is analyzed, to obtain the noise elimination analysis result of the test noise elimination exemplar 11.
Sound source modeling test device provided by the invention controls all kinds of the making an uproar that loudspeaker send out test needs by control device
Sound, the test for matching the anti-acoustic capability of engine for carrying out silencer, improves the verifying speed of anti-acoustic capability, makes eliminate the noise early period
The limitation of engine shortage is broken away from the research of device NVH, while can realize a large amount of design schemes screening of development phase.In addition,
Sound source modeling test device provided by the invention provides air-flow using air blower, and air flow rate is easy to adjust, and control is accurate, leads to
It is good with property.And the sound source modeling test device that provides of invention generates when eliminating air blower work using resistive absolute silencer
Some mechanical vibration noise and whole high-frequency air flow noises；Test sample, which is placed directly in an anechoic room, completes final noise
Performance test, anechoic room can exclude the influence of air blower and ambient noise to test to the greatest extent.
Specifically, in order to enable the air-flow that air blower 1 provides can enter in resistive absolute silencer 6, the sound source
Simulating test device further includes connecting tube 3, the connecting tube 3 be located at the air blower 1 and the resistive absolute silencer 6 it
Between, the connecting tube 3 can connect the outlet of the air blower 1 with the entrance of the resistive absolute silencer 6.
Further specifically, in order to realize the adjusting to the flow of air-flow, the sound source modeling test device further includes stream
The air flow outlet in the air blower 1 is arranged in adjustable valve 2, the flow control valve 2, and the flow control valve 2 can be adjusted
The uninterrupted of the air-flow of the offer of the air blower 1 is provided.
In order to realize the measurement to parameters such as the pressure, temperature and flow of air-flow, the sound source modeling test device is also
Including pipeline fluid measuring device 4, the pipeline fluid measuring device 4 setting is in the air blower 1 and described resistive absolutely disappears
In connecting tube 3 between sound device 6, the pipeline fluid measuring device 4 can measure the air-flow in the connecting tube 3 pressure,
Temperature and flow.
In order to realize that connection and fixation, the sound source modeling test device further include the first connecting flange 5, the second connection method
Orchid 7 and third connecting flange 10, first connecting flange 5 are arranged in the inlet of the resistive absolute silencer 6, and described the
The entrance of the resistive absolute silencer 6 can be connect by one connecting flange 5 with the connecting tube 3, second connecting flange 7
It is arranged in the exit of the resistive absolute silencer 6, second connecting flange 7 can be by the resistive absolute silencer 6
It is connected with the sound source case 9, the third connecting flange 10 is located in the anechoic room 13, and the third connecting flange 10 can
The outlet of the sound source case 9 is connect with the test noise elimination exemplar 11 in the anechoic room 13.
As the specific implementation mode of the resistive absolute silencer 6, as shown in Fig. 2, the resistive absolute silencer 6 wraps
Include inlet flange 61, air inlet pipe 62, sound attenuation hole pipe 63, noise elimination cotton 64, silencer pad 65, outer barrel 66, interior punching cylinder 67, outlet
Pipe 68 and outlet flange 69, the inlet flange 61 are arranged in the inlet of the air inlet pipe 62, the inlet flange 61 and institute
State the connection of the first connecting flange 5, the air inlet pipe 62 and the sound attenuation hole pipe 63 connection, the sound attenuation hole pipe 63 and the outlet
Pipe 68 connects, and the exit of the escape pipe 68 connects the outlet flange 69, and the outlet flange 69 is connect with described second
Flange 7 connects, and the noise elimination cotton 64 is arranged around the sound attenuation hole pipe 63, and the interior punching cylinder 67 is circumferentially positioned at described disappear
The outside of sound cotton 64, the outer barrel 66 are set in the outside of the interior punching cylinder 67, and the silencer pad 65 is arranged described
Between interior punching cylinder 67 and the outer barrel 66.
As the specific implementation mode of the sound source case 9, as shown in figure 3, the sound source case 9 includes sound source case inlet flange
91, punching babinet 95, sound source case outlet in sound source case air inlet pipe 92, sound source case outer case 93, sound source case silencer pad 94, sound source case
Pipe 95 and sound source case outlet flange 96, the sound source case outer case 93 are arranged the outside of punching babinet 95 in the sound source case, institute
It states sound source case silencer pad 94 to be located in the sound source case between punching babinet 95 and the sound source case outer case 93, the sound source case
9 form hollow cavity, and the cavity includes arrival end and outlet end, the sound source case inlet flange 91 and the sound source case into
The entrance of tracheae 92 connects, and the sound source case inlet flange 91 is connect with second connecting flange 7, the sound source case air inlet pipe
92 connect with the arrival end, and the outlet end connects the sound source case escape pipe 95, the outlet of the sound source case escape pipe 95
It is connect with the sound source case outlet flange 96, the sound source case outlet flange 96 is connect with the third connecting flange 10.
Specifically, in order to realize the amplification of noise, the sound source modeling test device further includes power amplifier 14, described
The input terminal of power amplifier 14 is connect with the control device 16, the output end of the power amplifier 14 and the loudspeaker 8
The control device 16 can be sent out each noise like that test needs and is amplified by connection, the power amplifier 14.
It should be noted that the control device 16 is specifically as follows data processing computer, 16 energy of the control device
The recording of the engine of recording is enough prestored, the recording of the engine of recording is then sent to loudspeaker by power amplifier 14
8.
Specifically, two loudspeaker 8 are set in the sound source case 9, and two loudspeaker 8 are symmetrically fixed on the sound source case 9
On interior partition board, two loudspeaker 8 are connect with the output end of the power amplifier 14, and two wheats are arranged in the anechoic room 13
Gram wind 12.
Preferably, the harvester 15 includes data collection and analysis instrument.
It should be noted that using corresponding Different Work Condition of Engine（Idling and acceleration）Under noise file as input.
Directly is chosen by computer and operated, it is simple and convenient.Using 2 horn-type loudspeakers as sound source, made an uproar using power amplifier control
Sound size；Relied using the taper silencer box of internal face filling noise elimination cotton outside horn-type loudspeaker and further decreases blower noise
The sound wave interference of influence and 2 horn-type loudspeakers.
It should also be noted that, the anechoic room selects small-sized anechoic room, test to be placed directly in one with silencer exemplar
Final noiseproof feature test is completed in small-sized anechoic room, small-sized semianechoic room can exclude air blower and ring to the greatest extent
Influence of the border noise to test；Sound source modeling test device provided by the invention can realize the quick test of anti-acoustic capability, side
Just development phase carries out the screening of a large amount of schemes；And sound source modeling test device provided by the invention is recorded using the noise of high-fidelity
Sound file substitutes engine sound source, and the influence of engine exhaust is substituted using air blower, using small-sized semianechoic room for reduction ring
Influence of the border noise to experiment, at low cost, precision is high.
The course of work of sound source modeling test device provided by the invention is described in detail with reference to Fig. 1 to Fig. 3.
Sound source modeling test device front end installs air blower 1 and is used as wind regime, and air-flow stream is controlled by flow control valve 2
Amount, air blower 1 are connected by connecting tube 3 and pipeline fluid measuring system 4, and pipeline fluid measuring system 4 is used for measuring in pipeline
The parameters such as pressure, temperature, the flow of gas.A resistive absolute silencer 6 is connected by the first connecting flange 5 after connecting tube 3,
Resistive 6 size of absolute silencer is larger, it is believed that it can completely eliminate air blower generation with sufficiently large noise elimination volume
Noise.Resistive 6 rear end of absolute silencer is connected by the second connecting flange 7 and sound source case 9, and 2 loudspeakers are equipped with inside sound source case 9
Loud speaker 8, for generating each noise like that test needs.Horn-type loudspeaker is fixed on as sound source on the partition board in speaker,
Two horn-type loudspeakers are symmetrically placed in main pipeline both sides, generate uniform sound field.9 rear end pipeline of sound source case accesses one small-sized half
Inside anechoic room 13, and pass through third connecting flange 10 connecting test silencer exemplar 11 inside anechoic room 13.Small-sized half
Anechoic room 13 can completely cut off the influence of the noise and ambient noise of air blower to test result to the greatest extent.Test silencer
After exemplar 11 two Mikes 12 are disposed according to testing standard（Installation position is 45 ° of critical point end central point of distance exhaust, 500mm）Wind
It is tested.
Air blower 1 is configured according to the extraction flow under engine actual condition, and extraction flow is determined in steady state condition setting,
It is anxious accelerate and anxious decelerating mode can according to when m- flow changing curve loaded.The fluid parameters such as flow, pressure, temperature can
Directly to be directly read by pipeline fluid measuring system 4.
Sound source modeling test device establishes different displacements, no using the high-fidelity engine exhaust noise that records
The exhaust noise database of similar h type engine h.Sound source modeling test device can play engine exhaust noise, and can be right
Testpieces carries out insertion loss, transmits loss, idle noise, Rapidly Speeding-up noise and anxious deceleration noise testing, and error is controllable
In the range of system.Meanwhile the main deadening frequency band of testpieces can be analyzed by the device, it can be to engine noise master
Concentrate on which kind of frequency range is analyzed.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, in the essence for not departing from the present invention
In the case of refreshing and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of sound source modeling test device, which is characterized in that the sound source modeling test device includes：Air blower, it is resistive absolutely
To silencer, sound source case, anechoic room, control device and harvester,
The air blower is connected with the entrance of the resistive absolute silencer, the entrance of the sound source case and described resistive is absolutely disappeared
The outlet of sound device connects, and the outlet of the sound source case is connect with the entrance of the anechoic room, and test is provided in the anechoic room
With noise elimination exemplar and microphone, the harvester is connected with the microphone, and loudspeaker, the control are provided in the sound source case
Device processed is connected with the loudspeaker and the harvester respectively,
The air blower can provide different in flow rate and flow air-flow, the resistive absolute noise elimination according to different measurement conditions
The noise that device can generate the air blower is eliminated, and the loudspeaker can send out survey under the control of the control device
Each noise like needed is tried, each noise like that the air-flow and the loudspeaker are sent out enters described disappear by the sound source case
Sound chamber, the test can eliminate the noise to the air-flow with each noise like with noise elimination exemplar, and the microphone can acquire institute
The sound after test noise elimination exemplar is eliminated the noise is stated, and collected sound can be sent to the harvester, the acquisition
The sound can be sent to the control device by device, and the control device can divide the collected sound
Analysis, to obtain the noise elimination analysis result of the test noise elimination exemplar.
2. sound source modeling test device according to claim 1, which is characterized in that the sound source modeling test device is also wrapped
Connecting tube is included, the connecting tube is located between the air blower and the resistive absolute silencer, and the connecting tube can be by institute
The outlet for stating air blower is connected with the entrance of the resistive absolute silencer.
3. sound source modeling test device according to claim 2, which is characterized in that the sound source modeling test device is also wrapped
Flow control valve is included, the air flow outlet in the air blower is arranged in the flow control valve, and the flow control valve can be adjusted
Save the uninterrupted for the air-flow that the air blower provides.
4. sound source modeling test device according to claim 2, which is characterized in that the sound source modeling test device is also wrapped
Include pipeline fluid measuring device, the pipeline fluid measuring device setting the air blower and the resistive absolute silencer it
Between connecting tube on, the pipeline fluid measuring device can measure pressure, temperature and the flow of the air-flow in the connecting tube.
5. sound source modeling test device according to claim 2, which is characterized in that the sound source modeling test device is also wrapped
The first connecting flange, the second connecting flange and third connecting flange are included, the first connecting flange setting is described resistive absolute
The inlet of silencer, first connecting flange can connect the entrance of the resistive absolute silencer and the connecting tube
It connects, second connecting flange is arranged in the exit of the resistive absolute silencer, and second connecting flange can be by institute
It states resistive absolute silencer to connect with the sound source case, the third connecting flange is located in the anechoic room, and the third connects
The outlet of the sound source case can be connect with positioned at the indoor test of eliminating the noise with noise elimination exemplar by acting flange.
6. sound source modeling test device according to claim 5, which is characterized in that the resistive absolute silencer include into
Gas flange, air inlet pipe, sound attenuation hole pipe, noise elimination cotton, silencer pad, outer barrel, interior punching cylinder, escape pipe and outlet flange, it is described
Inlet flange is arranged in the inlet of the air inlet pipe, and the inlet flange is connect with first connecting flange, the air inlet
Pipe is connected with the sound attenuation hole pipe, and the sound attenuation hole pipe is connected with the escape pipe, described in the exit connection of the escape pipe
Outlet flange, the outlet flange are connect with second connecting flange, and the noise elimination cotton is arranged around the sound attenuation hole pipe, institute
The outside that interior punching cylinder is circumferentially positioned at the noise elimination cotton is stated, the outer barrel is set in the outside of the interior punching cylinder,
The silencer pad is arranged between the interior punching cylinder and the outer barrel.
7. sound source modeling test device according to claim 5, which is characterized in that the sound source case includes sound source case air inlet
Punching babinet, sound source case escape pipe harmony in flange, sound source case air inlet pipe, sound source case outer case, sound source case silencer pad, sound source case
Source case outlet flange, the sound source case outer case are arranged the outside of punching babinet in the sound source case, the sound source case silencer pad
It is punched between babinet and the sound source case outer case in the sound source case, the sound source box-shaped is described at hollow cavity
Cavity includes arrival end and outlet end, and the sound source case inlet flange is connect with the entrance of the sound source case air inlet pipe, the sound
Source case inlet flange is connect with second connecting flange, and the sound source case air inlet pipe is connect with the arrival end, the outlet
End connects the sound source case escape pipe, the outlet of the sound source case escape pipe and the sound source case outlet flanged joint, the sound
Source case outlet flange is connect with the third connecting flange.
8. sound source modeling test device as claimed in any of claims 1 to 7, which is characterized in that the sound source mould
Quasi- test device further includes power amplifier, and the input terminal of the power amplifier is connect with the control device, the power
The output end of amplifier is connect with the loudspeaker, and the control device can be sent out each of test needs by the power amplifier
Noise like is amplified.
9. sound source modeling test device according to claim 8, which is characterized in that two loudspeakers are arranged in the sound source case
, two loudspeaker are symmetrically fixed on the partition board in the sound source case, and two loudspeaker are defeated with the power amplifier
Outlet connects, and two microphones are arranged in the anechoic room.
10. sound source modeling test device according to claim 8, which is characterized in that the harvester includes that data are adopted
Set analysis instrument.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN112254804A (en) * | 2019-07-22 | 2021-01-22 | 中车长春轨道客车股份有限公司 | Sound source judgment method and device, computer equipment and storage medium |
| CN113108895A (en) * | 2021-04-06 | 2021-07-13 | 绍兴市质量技术监督检测院 | High-accuracy complete-elimination detection system |
| 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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| 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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