CN205103033U - Engine exhaust noise off -line emulation test bench - Google Patents
Engine exhaust noise off -line emulation test bench Download PDFInfo
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- CN205103033U CN205103033U CN201520954565.3U CN201520954565U CN205103033U CN 205103033 U CN205103033 U CN 205103033U CN 201520954565 U CN201520954565 U CN 201520954565U CN 205103033 U CN205103033 U CN 205103033U
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Abstract
The utility model provides an engine exhaust noise off -line emulation test bench, belongs to environmental simulation equipment, and its structure includes the air supply that produces the required gas of simulation motor exhaust, control of gases's flow and the test section of the control section that admits air of temperature and elimination induction noise, the noise section that produces the simulation motor noise and loading testpieces, and air supply, the control section that admits air, noise section and test section connect gradually, the noise section includes speaker and sound -proof box, and the speaker is located sound -proof box so that external disturbance is avoided to noise broadcast process, thereby the test section provides the experimental enviroment of avoiding the environmenttal stress for the anechoic room that completely cuts off external noise for the testpieces. The utility model discloses a size of simulating carminative flow, temperature and noise all can the independent control, can accomplish the hot exhaust noise simulation with the cold state of engine.
Description
Technical field
The utility model relates to a kind of vehicular engine exhaust noise off-line simulation testing table, for simulating the exhaust attribute of vehicular engine under different operating mode, belongs to environmental simulation equipment.
Background technology
Along with developing rapidly of modern science and technology and auto industry, output and the recoverable amount of automobile constantly increase, and automobile noise has become the important pollution source affecting people's quality of life, so countries in the world have put into effect the relevant laws and regulations of limiting vehicle noise in succession.The proportion that auto exhaust noise accounts for automobile noise is comparatively large, so installing sound suppressor after gas outlet additional is simple and effective approach.And for traditional muffler desing method, need repeatedly to circulate through " design-trial-production-test-Curve guide impeller-trial-production-test " etc., the cycle is long, and input cost is high, and the sound suppressor versatility designed is poor.So design a kind of vehicular engine exhaust noise off-line simulation testing table, in order to carry out the vehicular engine exhaust emulation of the different operating mode of different displacements, the fuel consume for Muffler Performance test can be reduced like this, save cost of development, improve efficiency of research and development, the research for Muffler Performance has far reaching significance.
The acoustic attenuation performance of sound suppressor and aerodynamic quality evaluate two large important indicators of its quality, both are closely related with delivery temperature, flow velocity, noise size etc., only have and accurately, quantitatively, controllably simulate these attributes, a reliable working environment could be provided for exhaust silencer, the result drawn is just accurate, and therefore, off-line simulation testing table must possess These characteristics, just there is versatility, muffler desing, coupling work could be carried out easily.
Also the research of some engine test plants is had in current this area, but some test units can only engine exhaust under simple analog cold conditions, the testing table that people as superfine in Cai (Test Bed for Acoustic Properties of Exhaust Mufflers develop, Jiangsu Polytechnical College journal the 4th phase in 1991) designs can not simulate hot under engine exhaust; The sound source of some testing table application is white noise, as the people such as Ruan Dengfang (development of internal combustion engine exhaust silencer characteristic test apparatus and application, internal-combustion engine engineering the 4th phase in 2004) " the internal combustion engine exhaust silencer characteristic test apparatus " that design apply the sound source of white noise, because experimental enviroment and true environment there are differences, application is restricted.
Utility model content
For the problems referred to above, the purpose of this utility model is to provide a kind of engine exhaust noise off-line simulation testing table, this testing table can simulate the engine exhaust under different type of machines and different operating mode quantitatively, accurately, for the match test of sound suppressor and engine provides close to actual noise source and source of the gas, to carry out sound suppressor match test, reduce test and consume.
The technical scheme in the invention for solving the technical problem is: a kind of engine exhaust noise off-line simulation testing table, comprise the air inlet control section of the source of the gas producing simulated engine exhaust desired gas, the flow controlling gas and temperature and elimination induction noise, produce the noise segment of simulated engine noise and the test section of loading test part, source of the gas, air inlet control section, noise segment are connected successively with test section; Noise segment comprises loudspeaker and soundproof box, and loudspeaker is positioned at soundproof box to make noise playing process from external interference, the anechoic chamber that test section is isolated ambient noise thus provide the experimental enviroment from ectocine for testpieces.
Further technical scheme is: described source of the gas is fan blower.Blower power is sufficient, and for generation of for the gas needed for simulated engine exhaust, the engine exhaust of small displacement in can simulating, also can simulate the engine exhaust of huge discharge.
Further technical scheme is: described air inlet control section comprises by-pass valve, flowmeter, heating wire and sound suppressor, by-pass valve, flowmeter and heating wire are arranged on the pipeline of air inlet control section successively, and sound suppressor is arranged between the pipeline of air inlet control section and the pipeline of noise segment to eliminate induction noise; Described by-pass valve is provided with the passage that is connected with air to regulate required air capacity, the temperature that the gas that described electric-heating-wire-heating source of the gas provides is vented with control simulation.During by-pass valve adjustment air capacity, the reading according to flowmeter regulates.
The gas of discharging due to engine is hot gas, arranges the simulation that heating wire can complete hot exhaust, more close to the actual conditions of engine exhaust; Utilize prior art, the power that can realize by changing heating wire changes the heating-up temperature of heating wire, realizes gas temperature controlled, simulates the engine exhaust under different operating mode; Sound suppressor eliminates the noise that source of the gas produces, and can not impact when ensureing that gas enters noise segment to the noise that noise segment produces.
Further technical scheme is: described sound suppressor is dissipative muffler.Dissipative muffler is made up of the perforated plate of inside, outside housing and the silencing cotton between perforated plate and housing, has the features such as structure is simple, volume is little, good muffling effect.
Further technical scheme is: described noise segment also comprises sound control desk and power amplifier, sound control desk is connected with described loudspeaker by power amplifier, sound control desk inside is loaded with the integrated noise of multi-wavelength together with combination of frequency and volume is adjustable, described soundproof box side is connected with air inlet control section by gas access, and soundproof box opposite side is connected with test section by gas vent.Sound control desk is loaded into the engine noise be collected, laboratory technician can select by sound control desk the noise playing which kind of operating mode or which kind of type, control signal is transferred on power amplifier by sound control desk, under the driving effect of power amplifier, ensure that loudspeaker can provide good engine simulator and noise tonequality to export.
Further technical scheme is: described loudspeaker comprises multiple, between multiple loudspeaker series connection and all towards the direction of the gas vent of soundproof box, the distance between each loudspeaker and gas vent of soundproof box is equal.The direction of loudspeaker is all towards gas vent direction, sound can be reduced transmit in the environment outside soundproof box casing, and because each loudspeaker is equal with the distance of gas vent, so the sound sent can be enhanced because phase place is identical at gas outlet, farthest reduce the loss of the noise that noise segment sends and improve its fidelity.
Further technical scheme is: the sidewall of described soundproof box comprises internal layer, skin and middle layer, described internal layer be perforated plate with the sound avoiding loudspeaker to send in soundproof box internal reflection, thus avoid sound from disturbing, described skin is housing, described middle layer is between internal layer and skin, and middle layer is made up of silencing cotton.Perforated plate covers whole box house surface, for the silencing cotton in fixing middle layer, perforated plate surface spreads all over the aperture that aperture is about 1cm, the sound major part sent from loudspeaker passes together with air-flow, fraction enters silencing cotton by aperture, in the environment that sound so just can be stoped to enter outside casing, harmful effect is produced to the testing crew in environment and equipment; If use the sheet metal of not tape punching to fix silencing cotton in inside, the sound sent from loudspeaker constantly can reflect in inside, defines certainly disturbing of sound, affects the quality of noise, so perforated plate equally also can prevent certainly disturbing of sound.
Further technical scheme is: described perforated plate adopts aluminum material.General quieter material, to high, the mid-frequency noise Be very effective of elimination, is not then very effective to the elimination of low-frequency noise, aluminum material can in wider frequency band range stress release treatment, and reduce and take volume.
Further technical scheme is: described source of the gas, air inlet control section, be connected with flange by pipeline between noise segment and test section.High and the good seal performance of Flange joint easy accessibility, intensity.
The beneficial effects of the utility model are:
1, the flow velocity of the gas of simulated engine exhaust can be regulated by by-pass valve, the temperature of gas can be regulated by heating wire, the size of noise can be regulated by sound control desk, thus the flow velocity of gas, temperature and noise size can independently be controlled, can quantitative simulation exhaust temperature, flow velocity, noise, be applicable to the sound suppressor match test under different type of machines, different operating mode;
2, the loudspeaker that noise source adopts sound control desk to control, sound control desk is loaded into the engine noise be collected, can select send the wider white noise of noise band or send the specific noise of certain type under certain specific operation by sound control desk, in engine working process, noise through exhaust silencer is by various frequency, the multiple noise combination integrated noise together of various wavelength, if and the noise only applying single-frequency goes the acoustic attenuation performance studying sound suppressor just to lose the realistic meaning of research, so the application of this testing table can send various wavelength, the loudspeaker of the Complex Noise of various frequency, test findings is made to have more realistic meaning, the matching effect of sound suppressor and engine significantly improves, also just improve the versatility of testing table, moreover, the course of work of engine is a process constantly fluctuated, there are pinking or these abnormal situations of burning of rough running even sometimes, if so the noise of application specific frequency spectrum cannot emulate preferably, the loudspeaker that now application sends real noise has just more highlighted advantage,
3, the utility model is provided with exhaust box in air inlet control section, the impact of the noise that induction noise produces for noise segment can be eliminated, simultaneously, the loudspeaker of noise segment is positioned at soundproof box, ensure in noise playing process not by external interference, soundproof box is by the aluminum perforated plate of internal layer, middle silencing cotton and outermost housing composition, the perforated plate of aluminum covers whole soundproof box box house surface, for the silencing cotton in fixing middle layer, perforated plate surface spreads all over the aperture that aperture is about 1cm, the sound major part sent from loudspeaker passes together with air-flow, fraction enters silencing cotton by aperture, in the environment that sound so just can be stoped to enter outside casing, harmful effect is produced to the testing crew in environment and equipment, if use the sheet metal of not tape punching to fix silencing cotton in inside, the sound sent from loudspeaker constantly can reflect in inside, defines certainly disturbing of sound, affects the quality of noise, so perforated plate equally also can prevent certainly disturbing of sound,
4, the perforated plate in exhaust box and soundproof box adopts aluminum material, can in wider frequency band range stress release treatment;
5, loudspeaker is provided with multiple, between multiple loudspeaker series connection and all towards the direction of the gas vent of soundproof box, the distance between each loudspeaker and gas vent of soundproof box is equal.The direction of loudspeaker is all towards gas vent direction, sound can be reduced transmit in the environment outside soundproof box casing, and because each loudspeaker is equal with the distance of gas vent, so the sound sent can be enhanced because phase place is identical at gas outlet, the loss of the noise that maximum minimizing noise segment sends and its fidelity of raising, close to the real work situation of engine, test findings is accurate.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment.
In figure: 1 fan blower, 2 by-pass valve, 3 flowmeters, 4 heating wire, 5 sound suppressors, 6 soundproof boxs, 7 anechoic chambers, 8 testpieces, 9 sound control desks, 10 power amplifiers, 11 loudspeakers.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the utility model will be further described:
As shown in Figure 1.A kind of engine exhaust noise off-line simulation testing table, comprises the source of the gas, air inlet control section, noise segment and the test section that are connected successively by pipeline and flange.
Described source of the gas is fan blower 1.Fan blower 1 power is sufficient, and for generation of for the gas needed for simulated engine exhaust, the engine exhaust of small displacement in can simulating, also can simulate the engine exhaust of huge discharge.
Described air inlet control section comprises by-pass valve 2, flowmeter 3, heating wire 4 and sound suppressor 5, and by-pass valve 2, flowmeter 3 and heating wire 4 are arranged on the pipeline of air inlet control section successively, between the pipeline that sound suppressor 5 is arranged on air inlet control section and the pipeline of noise segment; Described by-pass valve 2 is provided with the passage that is connected with air to regulate required air capacity according to the reading of flowmeter 3, and the temperature that the gas that described heating wire 4 blows out for heater blower 1 is vented with control simulation, described sound suppressor 5 is for eliminating induction noise.
The gas of discharging due to engine is hot gas, arranges the simulation that heating wire 4 can complete hot exhaust, more close to the actual conditions of engine exhaust; Utilize prior art, the power that can realize by changing heating wire 4 changes the heating-up temperature of heating wire 4, realizes gas temperature controlled, simulates the engine exhaust under different operating mode; Sound suppressor 5 eliminates the noise that source of the gas produces, and can not impact when ensureing that gas enters noise segment to the noise that noise segment produces.
Sound suppressor 5 is the dissipative mufflers be made up of the perforated plate of inside, outside housing and the silencing cotton between perforated plate and housing.
Noise segment comprises sound control desk 9, power amplifier 10, loudspeaker 11 and soundproof box 6, sound control desk 9 is connected with described loudspeaker 11 by power amplifier 10, loudspeaker 11 is positioned at soundproof box 6 to make noise playing process from external interference, soundproof box 6 side is connected with air inlet control section by gas access, and soundproof box 6 opposite side is connected with test section by gas vent.
Loudspeaker 11 is furnished with two, two loudspeaker 11 symmetries to be arranged in soundproof box 6 above and below gas access, between two loudspeakers 11 series connection and all towards the direction of the gas vent of soundproof box 6, the distance between each loudspeaker 11 and gas vent of soundproof box 6 is equal.The direction of loudspeaker 11 is all towards gas vent direction, sound can be reduced transmit in the environment outside soundproof box 6 casing, and because each loudspeaker 11 is equal with the distance of gas vent, so the sound sent can be enhanced because phase place is identical at gas outlet, farthest reduce the loss of the noise that noise segment sends and improve its fidelity.
Sound control desk 9 is for providing the integrated noise of multi-wavelength together with combination of frequency and volume is adjustable, described sound control desk 9 is loaded into the engine noise be collected, laboratory technician can select by sound control desk 9 noise playing which kind of operating mode or which kind of type, control signal is transferred on power amplifier 10 by sound control desk 9, under the driving effect of power amplifier 10, ensure that loudspeaker 11 can provide good engine simulator and noise tonequality to export.Sound control desk 9 can adopt the existing Audio Players with sound store function, realizes the loading of sound and the adjustment of volume.
The sidewall of described soundproof box 6 comprises internal layer, skin and middle layer, and internal layer is aluminum perforated plate, and skin is metal shell, and middle layer is silencing cotton.Perforated plate covers whole soundproof box 6 box house surface, for the silencing cotton in fixing middle layer, perforated plate surface spreads all over the aperture that aperture is about 1cm, the sound major part sent from loudspeaker 11 passes together with air-flow, fraction enters silencing cotton by aperture, in the environment that sound so just can be stoped to enter outside casing, harmful effect is produced to the testing crew in environment and equipment; If use the sheet metal of not tape punching to fix silencing cotton in inside, the sound sent from loudspeaker 6 constantly can reflect in inside, defines certainly disturbing of sound, affects the quality of noise, so perforated plate equally also can prevent certainly disturbing of sound.
Perforated plate adopt aluminum material, can in wider frequency band range stress release treatment.
Test section comprises anechoic chamber 7, and testpieces 8 is arranged in anechoic chamber 7, anechoic chamber 7 for the isolated external world noise thus provide the experimental enviroment from ectocine for testpieces 8.
The testing table of the present embodiment is utilized to carry out the test method tested, as follows: testpieces 8 is arranged on the interior pipeline be connected with noise segment in anechoic chamber 7, the gas that fan blower 1 blows out arrives air inlet control section along pipeline, by-pass valve 2 regulates required air capacity according to the number of degrees of flowmeter 3, the gas regulating air capacity heats through heating wire 4, and after inflow noise eliminated by sound suppressor 5, enter noise section through the gas access of soundproof box 6.The engine noise be collected is stored in sound control desk 9, laboratory technician selects by sound control desk 9 noise playing which kind of operating mode or which kind of type, control signal is transferred on power amplifier 10 by sound control desk 9, under the driving effect of power amplifier 10, ensure that loudspeaker 11 can provide good engine simulator and noise tonequality to export.Air-flow and noise enter test section, the soundproof effect of detection experiment part 8.
Air inlet control section of the present utility model is not limited to by-pass valve described in embodiment and flowmeter for the flow control of air inlet, can also adopt flow valve, flow sensor etc.
Air inlet control section of the present utility model is not limited to heating wire for the element controlling intake air temperature, can also adopt thermopair.
The loudspeaker of the utility model noise segment is not limited to two described in embodiment, loudspeaker can also arrange two or more, when the layout quantity of loudspeaker is two or more, should be evenly arranged around the gas access of soundproof box, make the distance between loudspeaker and the gas vent of soundproof box equal, and loudspeaker is all towards the direction of the gas vent of soundproof box.
The foregoing is only preferred embodiment of the present utility model; it is not whole embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Except technical characteristic described in instructions, all the other technical characteristics are those skilled in the art's known technology, and in order to outstanding innovative characteristics of the present utility model, above-mentioned technical characteristic does not repeat them here.
Claims (9)
1. an engine exhaust noise off-line simulation testing table, it is characterized in that, comprise the air inlet control section of the source of the gas producing simulated engine exhaust desired gas, the flow controlling gas and temperature and elimination induction noise, produce the noise segment of simulated engine noise and the test section of loading test part, source of the gas, air inlet control section, noise segment are connected successively with test section; Noise segment comprises loudspeaker and soundproof box, and loudspeaker is positioned at soundproof box to make noise playing process from external interference, the anechoic chamber that test section is isolated ambient noise thus provide the experimental enviroment from ectocine for testpieces.
2. a kind of engine exhaust noise off-line simulation testing table according to claim 1, it is characterized in that, described source of the gas is fan blower.
3. a kind of engine exhaust noise off-line simulation testing table according to claim 1, it is characterized in that, described air inlet control section comprises by-pass valve, flowmeter, heating wire and sound suppressor, by-pass valve, flowmeter and heating wire are arranged on the pipeline of air inlet control section successively, and sound suppressor is arranged between the pipeline of air inlet control section and the pipeline of noise segment to eliminate induction noise; Described by-pass valve is provided with the passage that is connected with air to regulate required air capacity, the temperature that the gas that described electric-heating-wire-heating source of the gas provides is vented with control simulation.
4. a kind of engine exhaust noise off-line simulation testing table according to claim 3, it is characterized in that, described sound suppressor is dissipative muffler.
5. a kind of engine exhaust noise off-line simulation testing table according to claim 1, it is characterized in that, described noise segment also comprises sound control desk and power amplifier, sound control desk is connected with described loudspeaker by power amplifier, sound control desk inside is loaded with the integrated noise of multi-wavelength together with combination of frequency and volume is adjustable, described soundproof box side is connected with air inlet control section by gas access, and soundproof box opposite side is connected with test section by gas vent.
6. a kind of engine exhaust noise off-line simulation testing table according to claim 5, it is characterized in that, described loudspeaker comprises multiple, between multiple loudspeaker series connection and all towards the direction of the gas vent of soundproof box, the distance between each loudspeaker and gas vent of soundproof box is equal.
7. a kind of engine exhaust noise off-line simulation testing table according to claim 1, it is characterized in that, the sidewall of described soundproof box comprises internal layer, skin and middle layer, described internal layer be perforated plate with the sound avoiding loudspeaker to send in soundproof box internal reflection, thus avoid sound from disturbing, described skin is housing, and described middle layer is between internal layer and skin, and middle layer is made up of silencing cotton.
8. a kind of engine exhaust noise off-line simulation testing table according to claim 7, is characterized in that, described perforated plate adopts aluminum material.
9. a kind of engine exhaust noise off-line simulation testing table according to claim 1, is characterized in that, described source of the gas, air inlet control section, is connected with flange by pipeline between noise segment and test section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520954565.3U CN205103033U (en) | 2015-11-25 | 2015-11-25 | Engine exhaust noise off -line emulation test bench |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520954565.3U CN205103033U (en) | 2015-11-25 | 2015-11-25 | Engine exhaust noise off -line emulation test bench |
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| CN205103033U true CN205103033U (en) | 2016-03-23 |
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| CN201520954565.3U Expired - Fee Related CN205103033U (en) | 2015-11-25 | 2015-11-25 | Engine exhaust noise off -line emulation test bench |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277370A (en) * | 2015-11-25 | 2016-01-27 | 山东大学 | Engine exhaust noise off-line simulation test table and test method |
| CN106023767A (en) * | 2016-07-11 | 2016-10-12 | 江苏建筑职业技术学院 | Noise pollution experience area and construction method |
| CN108593271A (en) * | 2018-03-26 | 2018-09-28 | 珠海格力电器股份有限公司 | Silencer measuring device |
| CN108716985A (en) * | 2018-04-03 | 2018-10-30 | 无锡威孚力达催化净化器有限责任公司 | A kind of sound source modeling test device |
| CN109186972A (en) * | 2018-08-07 | 2019-01-11 | 拾音汽车科技（上海）有限公司 | One kind is for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay |
| CN109916609A (en) * | 2019-03-20 | 2019-06-21 | 武汉理工大学 | A kind of modification method and device of built-up sound source noise signal |
-
2015
- 2015-11-25 CN CN201520954565.3U patent/CN205103033U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277370A (en) * | 2015-11-25 | 2016-01-27 | 山东大学 | Engine exhaust noise off-line simulation test table and test method |
| CN106023767A (en) * | 2016-07-11 | 2016-10-12 | 江苏建筑职业技术学院 | Noise pollution experience area and construction method |
| CN108593271A (en) * | 2018-03-26 | 2018-09-28 | 珠海格力电器股份有限公司 | Silencer measuring device |
| CN108716985A (en) * | 2018-04-03 | 2018-10-30 | 无锡威孚力达催化净化器有限责任公司 | A kind of sound source modeling test device |
| CN109186972A (en) * | 2018-08-07 | 2019-01-11 | 拾音汽车科技（上海）有限公司 | One kind is for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay |
| CN109916609A (en) * | 2019-03-20 | 2019-06-21 | 武汉理工大学 | A kind of modification method and device of built-up sound source noise signal |
| CN109916609B (en) * | 2019-03-20 | 2020-10-13 | 武汉理工大学 | Method and device for correcting combined sound source noise signal |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160323 Termination date: 20181125 |