CN104820732A - Noise optimization method for engine intake system - Google Patents
Noise optimization method for engine intake system Download PDFInfo
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- CN104820732A CN104820732A CN201510168621.5A CN201510168621A CN104820732A CN 104820732 A CN104820732 A CN 104820732A CN 201510168621 A CN201510168621 A CN 201510168621A CN 104820732 A CN104820732 A CN 104820732A
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- noise
- intake system
- engine aspirating
- system noise
- engine intake
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/82—Elements for improving aerodynamics
Abstract
The invention discloses a noise optimization method for an engine intake system. The method comprising the following steps: step one, establishing an engine intake system model; step two, simulating the noise state of the engine intake system based on the model; step three, analyzing acoustic field characteristics of the entire intake system by using CAE technology; and step four, optimizing the noise of the engine intake system by calculating, analyzing, reasonably designing and arranging of a noise elimination unit. By virtue of the noise optimization method for the engine intake system, the technical effects of reasonable design, high optimization efficiency and low cost are implemented.
Description
Technical field
The present invention relates to engine aspirating system research field, particularly relate to a kind of engine aspirating system noise optimization method.
Background technology
Present NVH(noise, vibration and comfortableness) performance become the important indicator evaluating automotive quality; The NVH performance that Ge great car load factory is all devoted to by improving automobile promotes its brand value and the market competitiveness; Meanwhile, along with people are to the continuous attention of noise pollution, the regulation for automobile noise is also further strict; Induction noise have also been obtained enough attention as an important noise source of automobile; And traditional design means can not for the market demand, rapid reaction, has designed the gas handling system met the demands.
In sum, present inventor, in the process realizing invention technical scheme in the embodiment of the present application, finds that above-mentioned technology at least exists following technical matters:
In the prior art, it is lower to there is efficiency in existing engine aspirating system noise optimization method, the technical matters that cost is larger.
Summary of the invention
The invention provides a kind of engine aspirating system noise optimization method, solving existing engine aspirating system noise optimization method, to there is efficiency lower, the technical matters that cost is larger, achieve engine aspirating system noise optimization method design reasonable, optimization efficiency is higher, lower-cost technique effect.
For solving the problems of the technologies described above, the embodiment of the present application provides engine aspirating system noise optimization method, and described method comprises:
Step 1: set up engine aspirating system model;
Step 2: based on described model, simulated engine intake system noise state;
Step 3: use CAE technology, analyze the sound field characteristic of whole gas handling system;
Step 4: by computational analysis, carries out appropriate design, arranges muffling unit, be optimized engine aspirating system noise.
Further, intake system noise is specifically divided into: airborne noise and construct noise.
Further, carry out appropriate design and arrange that muffling unit specifically comprises: appropriate design air cleaner, the caliber determining air filter inlet/outlet pipe and length, reasonable employment muffling unit, default noise countermeasure.
Further, described being optimized engine aspirating system noise specifically comprises: design Helmholz resonance device and interpolation 1/4 wavelength tube.
Further, described method after step 2 step 3 also comprises before: simulated engine intake system noise state, and determines the root producing noise.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
Owing to have employed engine aspirating system noise optimization method design as comprising: step 1: set up engine aspirating system model; Step 2: based on described model, simulated engine intake system noise state; Step 3: use CAE technology, analyze the sound field characteristic of whole gas handling system; Step 4: pass through computational analysis, carry out appropriate design, arrange muffling unit, to the technical scheme that engine aspirating system noise is optimized, so, efficiently solving existing engine aspirating system noise optimization method, to there is efficiency lower, the technical matters that cost is larger, and then it is reasonable to achieve engine aspirating system noise optimization method design, optimization efficiency is higher, lower-cost technique effect.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of engine aspirating system noise optimization method in the embodiment of the present application one.
Embodiment
The invention provides a kind of engine aspirating system noise optimization method, solving existing engine aspirating system noise optimization method, to there is efficiency lower, the technical matters that cost is larger, achieve engine aspirating system noise optimization method design reasonable, optimization efficiency is higher, lower-cost technique effect.
Technical scheme during the application implements is for solving the problems of the technologies described above.General thought is as follows:
To have employed engine aspirating system noise optimization method design as comprising: step 1: set up engine aspirating system model; Step 2: based on described model, simulated engine intake system noise state; Step 3: use CAE technology, analyze the sound field characteristic of whole gas handling system; Step 4: pass through computational analysis, carry out appropriate design, arrange muffling unit, to the technical scheme that engine aspirating system noise is optimized, so, efficiently solving existing engine aspirating system noise optimization method, to there is efficiency lower, the technical matters that cost is larger, and then it is reasonable to achieve engine aspirating system noise optimization method design, optimization efficiency is higher, lower-cost technique effect.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
Embodiment one:
In embodiment one, provide engine aspirating system noise optimization method, please refer to Fig. 1, described method comprises:
Step 1: set up engine aspirating system model;
Step 2: based on described model, simulated engine intake system noise state;
Step 3: use CAE technology, analyze the sound field characteristic of whole gas handling system;
Step 4: by computational analysis, carries out appropriate design, arranges muffling unit, be optimized engine aspirating system noise.
Wherein, in the embodiment of the present application, intake system noise is specifically divided into: airborne noise and construct noise.
Wherein, in the embodiment of the present application, the gas handling system of engine is a very complicated noise source, comprises various types of noise, and the mechanism that often kind of noise produces is different.Therefore, intake system noise is optimized and first wants each noise source Producing reason clear and definite, and determine the contribution amount of each noise source, then solve noise problem targetedly.
Intake system noise can be divided into airborne noise and the large class of construct noise two on the whole.Airborne noise comprises microseismic noise and flow noise.The pressure fluctuations that microseismic noise is produced by the periodicity open and close of inlet valve changes and is formed, this part noise major effect gas handling system low-frequency noise characteristic.In addition, when the natural frequency of draft tube air column is consistent with the main frequency of periodically pulsing noise, the sympathetic response sound of air column can be produced.In addition, due to a resonator may be formed between air intake opening and front side board, therefore also extra resonance noise may be produced.Flow noise be air-flow with high velocity stream through inlet valve flow area, formed eddy current, the high frequency noise of generation.Because inlet valve flow area is constantly change, therefore this noise has the frequency distribution of one fixed width, and major frequency components is at more than 1000Hz.In addition, sometimes also eddy current crack can be produced at throttle body place.
Air intake system structure radiated noise is caused by the stiffness characteristics that plastic casing is less.Under the excitation of internal pressure ripple, housing produces vibration, and outside surface promotes air and produces fluctuation, thus gives off noise.In fact internal pressure ripple mentioned here is exactly the sound wave of enclosure interior.
Wherein, in the embodiment of the present application, carry out appropriate design and arrange that muffling unit specifically comprises: appropriate design air cleaner, the caliber determining air filter inlet/outlet pipe and length, reasonable employment muffling unit, default noise countermeasure.
Wherein, in the embodiment of the present application, the method for flow noise and construct noise process is relatively single, and is not often the overriding noise of gas handling system.Here the noise reduction measure of low-frequency noise is mainly inquired into.
(1) appropriate design air cleaner.According to installing space design air filter body.Air cleaner volume should be large as far as possible, the large and bandwidth covered of such transmission loss.The draft tube of air filter and escape pipe are inserted in air filter sometimes, the length inserted has impact to transmission loss, different intubating lengths can both improve the transmission loss of air filter, but Inserting Tube can bring larger power loss, its power loss ratio reduction pipeline section amasss the loss brought and also wants large.
(2) caliber and the length of air filter inlet/outlet pipe is determined.Reduce air filter into and out of pipe caliber, increase divergence ratio, reduction noise is beneficial to, but the pressure loss of gas handling system can be increased, reduce the air inflow of engine, affect the performance of engine.The length of draft tube can have influence on effective frequency of noise elimination of air cleaner, and along with the increase of intake manifold length, the effective frequency of noise elimination of air cleaner will shift to low frequency, therefore, rationally determines that the length into and out of tracheae is also very important during design as required.
(3) reasonable employment muffling unit.Conventional muffling unit has Helmholz resonance chamber, 1/4 wavelength tube and 1/2 wavelength tube etc.Helmholtz sound suppressor is generally for low frequency, and 1/4 wavelength tube is generally used for eliminating high frequency noise.
(4) noise countermeasure preset.When engine nacelle space can not meet layout muffling unit requirement, can considering to use special noise countermeasure, as adopted air inlet woven tube, in wider scope, soundproof effect can be obtained.Sound-absorbing porous material is arranged in air cleaner mode high sound pressure concentrated area.
Wherein, in the embodiment of the present application, described being optimized engine aspirating system noise specifically comprises: design Helmholz resonance device and interpolation 1/4 wavelength tube.
Wherein, in the embodiment of the present application, in order to accurately identify the noise source of gas handling system, test inlet noise and air filter housing radiated noise simultaneously.Contrast finds that inlet noise accounts for principal ingredient.From overall sound pressure level poor linearity, and more high than the inlet noise target of setting.There is peak value when 1900r in 2 rank noises, 4 rank noises exist peak value when 4000r, and 6 rank noises exist peak value when 2636r, and 8 rank noises exist peak value when 2000r.Except 2 grades of noises, the frequency that other several peak values are corresponding is basically identical.The peak value of 2 rank noises at 63Hz place, causes the sympathetic response sound in car.
For analyzing each rank noise peak Producing reason further, we replace the noise at gas handling system test air intake opening place with straight tube.2 rank noises do not have peak value and exist 1900 turns time, and the little 10dB (A) of 2 rank noise at ratio band air cleaner air intake opening place.So peak value and sound source have nothing to do herein, should cause in bang path.For this reason, we analyze the transmission loss of whole gas handling system.Can draw from transmission loss result of calculation, there is valley point at 60Hz place in whole gas handling system, there is paddy band at about 260Hz.Therefore, in order to improve the noise reduction of gas handling system, need to improve at this two place.
Wherein, in the embodiment of the present application, described method after step 2 step 3 also comprises before: simulated engine intake system noise state, and determines the root producing noise.
Wherein, in the embodiment of the present application, in order to eliminate the noise peak of 2 rank noises at 63Hz place, simultaneously according to space arrangement requirement, the Helmholz resonance device of a 3L is devised.The key in design Helmholz resonance chamber selects installation site, and inappropriate installation site does not often have due effect.According to relevant Noise Theory, Helmholz resonance device should be arranged in the maximum region of acoustic pressure.The maximum region of acoustic pressure in inlet manifold, but arranges that Helmholtz sound suppressor is unpractical here, and actual optimum position should in the inflow point of draft tube.When designing Helmholz resonance chamber, also will consider that the temperature of gas handling system and flow velocity are on the impact of local velocity of sound, flow velocity affects outbalance to the velocity of sound.When the low operating mode of rotating speed, flow velocity is comparatively slow, relatively little on velocity of sound impact.After adding Helmholz resonance device, the transmission loss located at about 60Hz improves.
For the paddy band that about 260Hz exists, devise 1/4 wavelength tube.The same with design Helmholz resonance chamber, when designing 1/4 wavelength tube, first to consider installation site.Secondly, also to consider that flow velocity and temperature are on the impact of the velocity of sound.Here distinguishing with Helmholz resonance chamber, 1/4 wavelength tube will can play the effect of noise reduction under three different rotating speeds, and these three speed spans are comparatively large, and 2000 ~ 4000r/min, induction air flow ratio is roughly 10 ~ 21m/s.After adding 1/4 wavelength tube, the transmission loss located at about 260Hz is greatly improved.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
Owing to have employed engine aspirating system noise optimization method design as comprising: step 1: set up engine aspirating system model; Step 2: based on described model, simulated engine intake system noise state; Step 3: use CAE technology, analyze the sound field characteristic of whole gas handling system; Step 4: pass through computational analysis, carry out appropriate design, arrange muffling unit, to the technical scheme that engine aspirating system noise is optimized, so, efficiently solving existing engine aspirating system noise optimization method, to there is efficiency lower, the technical matters that cost is larger, and then it is reasonable to achieve engine aspirating system noise optimization method design, optimization efficiency is higher, lower-cost technique effect.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. engine aspirating system noise optimization method, is characterized in that, described method comprises:
Step 1: set up engine aspirating system model;
Step 2: based on described model, simulated engine intake system noise state;
Step 3: use CAE technology, analyze the sound field characteristic of whole gas handling system;
Step 4: by computational analysis, carries out appropriate design, arranges muffling unit, be optimized engine aspirating system noise.
2. method according to claim 1, is characterized in that, intake system noise is specifically divided into: airborne noise and construct noise.
3. method according to claim 1, is characterized in that, carries out appropriate design and arranges that muffling unit specifically comprises: appropriate design air cleaner, the caliber determining air filter inlet/outlet pipe and length, reasonable employment muffling unit, default noise countermeasure.
4. method according to claim 1, is characterized in that, described being optimized engine aspirating system noise specifically comprises: design Helmholz resonance device and interpolation 1/4 wavelength tube.
5. method according to claim 1, is characterized in that, described method after step 2 step 3 also comprises before: simulated engine intake system noise state, and determines the root producing noise.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111237103A (en) * | 2019-12-23 | 2020-06-05 | 重庆长安汽车股份有限公司 | Muffler element position optimization design method based on acoustic mode of air intake system |
| CN112199775A (en) * | 2020-09-30 | 2021-01-08 | 安徽江淮汽车集团股份有限公司 | Noise reduction method, device and equipment for automobile air intake system and storage medium |
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| JP2007172349A (en) * | 2005-12-22 | 2007-07-05 | Mazda Motor Corp | Predictive analysis system, method and program for engine performance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111237103A (en) * | 2019-12-23 | 2020-06-05 | 重庆长安汽车股份有限公司 | Muffler element position optimization design method based on acoustic mode of air intake system |
| CN112199775A (en) * | 2020-09-30 | 2021-01-08 | 安徽江淮汽车集团股份有限公司 | Noise reduction method, device and equipment for automobile air intake system and storage medium |
| CN112199775B (en) * | 2020-09-30 | 2023-07-04 | 安徽江淮汽车集团股份有限公司 | Noise reduction method, device, equipment and storage medium for automobile air intake system |
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