CN1682015A - Sound damper and structural design method therefor - Google Patents

Sound damper and structural design method therefor Download PDF

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Publication number
CN1682015A
CN1682015A CN03822070.9A CN03822070A CN1682015A CN 1682015 A CN1682015 A CN 1682015A CN 03822070 A CN03822070 A CN 03822070A CN 1682015 A CN1682015 A CN 1682015A
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China
Prior art keywords
groove
silencing apparatus
shell
aforementioned
noise
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CN03822070.9A
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Chinese (zh)
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CN100366868C (en
Inventor
G·吕尔斯
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Volkswagen AG
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Volkswagen AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/18—Exhaust treating devices having provisions not otherwise provided for for improving rigidity, e.g. by wings, ribs

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

The invention relates to a silencer comprising a silencer housing (1) and at least one inlet (3) and one outlet (4) for a waste gas. At least one functional surface (8) and at least one bead (5, 6, 7) are sunk into the housing surface (2), and the beads (5, 6,7) have at least one specific irregularity in the form and/or arrangement thereof for reducing the sound radiation. The invention also relates to a method for designing a silencer.

Description

The method of silencing apparatus and its structural design
The present invention relates to design method according to a kind of silencing apparatus He this silencing apparatus of independent claims preamble.
Be well known that, in the gas outlet means of Motor Vehicle, silencing apparatus be set.The combustion gas of discharging from internal-combustion engine is then from vent systems is discharged into freely atmosphere environment.This work, except avoiding owing to the pollution damage that gas and harmful matter solid cause, also should realize noiseless as much as possible.Reason for environmental protection also limits the noise emission that is allowed by the measure of legislation more and more thus.
Another important economic goal is exactly cheap price for a gas outlet means in addition.Win more and more significant meaning for the dimensional structure that is combined in little weight also very important in the Motor Vehicle and compactness.According to Motor Vehicle-and size of engine, one from exhaust elbow to the integral vent gas weight of equipment of holding pipe can 20 and 45kg between.All assemblies all influence the acoustical behavior of gas outlet means, and yes in a completely different way.Wherein, not only estimate the relief opening of this gas outlet means and the noise reflection on surface objectively, it is important as everyone knows for the noise emission when quickening to overtake other vehicles-and the observer all play the part of important role for the objective impression of sound spectrogram.
The acoustic characteristic of gas outlet means also depends primarily on the size design on the exhaust system structure except the load variations noise of motor.In this symmetry properties of breeches pipe particularly, the diameter of the quantity of silencing apparatus and position and connecting tube is all played the part of an important role.Gas outlet means may produce the noise that increases the weight of under bad structural design situation.The increasing common many valve-technology of transmission device cause entering obviously increasing of noise level in this gas outlet means.But future, the further reduction to the noise limit value that acceleration is overtaken other vehicles then required the relief opening noise significantly to reduce.The noise level decline of these requirements now increases realization by the volume of silencing apparatus basically, but can reach the gauge in existing structure space so soon.Therefore, in order to utilize in base assemblies spendable structure space also under middle-sized Motor Vehicle situation, to adopt the silencing apparatus of casing structure mode more and more best.These case silencing apparatuss have a smooth big surface in principle, and this helps the noise reflection.A kind of like this case-silencing apparatus for example has been described in annual publication the 62,2001, the 3rd volume among the engine technology magazine MTZ, and the 3rd page backward.
For those reasons, significant meaning has been occupied as noise source in the surface of gas outlet means when designing gas outlet means in recent years.Under the engine conditions of high specific power and bad silencing apparatus-geometric shapes, surface-noise reflection even possibility dominate.Also therefore the General Arrangement Drawing of this gas outlet means just must be by evaluation and optimization setting in noise emission.If this work is not done, then exist big danger to be, because the structural arrangements of the bad distribution of silencing apparatus volume and silencing apparatus causes the volume of obviously Duo than needed, in other words about the exhaust back-pressure of internal combustion engine of motor vehicle and thus the tolerance of this power loss just become necessity.
The increase of volume also causes undesirable weight to increase in addition.In addition, this General Arrangement Drawing of gas outlet means distributes by volume not only influences this noise emission significantly with the length of connecting tube but also passes through related with it mass distribution and natural resonance characteristic that oeverall quality influences mechanical vibration.So not only influence the fatigue strength under oscillation stresses of this equipment but also influenced noise intensity in the main cabin.Described in addition tendency then attempts the surface of silencing apparatus and the ratio of volume are reduced owing to the structure space limit growth for a long time.
Not only the physical property parameter of acoustic wave filter structure element is all depended in the reflection of this bulk noise but also noise.These parameters are flexural rigidity and linear mass of structural member, and they are determined by the structural member geometrical construction.Similarly, material behavior such as spring modulus and thickness-they are to pre-determine so can not obviously change-also have influence by the material of using.The damping of structural member is a basic parameter, but is difficult to do quantitative judge.The variation of certain size can cause different body noise level and degree of reflection.Therefore the expansion of flexural rigidity generally will cause reducing of body level of noise, but but cause the raising of reflectance usually, and wherein this body level of noise occupies leading mostly.Even for the simple geometric structure shape, after the structural member characteristic modelling and the prediction also be difficult because the very intricately alternation effect mutually of these parameters.
Flexural rigidity is known to be in order to improve, and (Sicken) inserts in the surface of silencing apparatus with so-called groove.It also is known that groove has different shapes, as earthworm groove (Regenwurmsicken) or golf ball bag shape.The earthworm groove is microscler Organizational Structure, and it is made into as a shape that earthworm is similar, and golf bag (Golfballsicken) is the outstanding or recessed hemisphere Organizational Structure with the golf ball form simultaneously.This golf bag is for example known in the automotive industry magazine.
Disclose a kind of exhaust gas muffler in class file DE19849118A1, it is made by half case, and these half cases have the bottom of a substantially flat.In the bottom of upper casing, be provided with the microscler outstanding or groove of a plurality of outside sensings.These grooves have been strengthened the rigidity of housing on the one hand and have been helped reducing because the noise-excitation that vibration causes as above-mentioned, groove constitutes corresponding raised structures in the inner chamber of silencing apparatus on the other hand, and they have set up additional volume in that side of base plane in the inner chamber of silencing apparatus.
Task of the present invention is, a silencing apparatus that further improves damping characteristic is set, and a method that is used for its structural design.
This task solves by the feature scheme of independent claims respectively.
According to the present invention the surface of shell of the band groove of an optimum is set, the configuration and/or the structural arrangements of its further groove are characterised in that suitable nonuniformity is to be used to reduce the noise reflection of silencing apparatus.
As preferably, groove of the present invention does not generally have symmetrical line in the cross sectional planes that is parallel to the suppressor case surface.In addition preferably, the surperficial share compared with the total surface of silencing apparatus of single groove has very wide distribution.The warp architecture distribution of a wide preferred continuous recess envelope curver in addition advantageously, is set.
Additional advantages of the present invention and favourable organization plan accessory rights requirement are irrespectively obtained in specification and the accompanying drawing.
The present invention will do at length to set forth by accompanying drawing, and wherein this accompanying drawing shows:
Fig. 1 is a view of looking side ways up to the silencing apparatus with preferred groove (Sicken), and this groove is by describing with hachure;
Fig. 2 is one and looks side ways view on the silencing apparatus that has preferred groove Fig. 1 from bottom;
Fig. 3 is the view of the silencing apparatus inside of a band function surface, and this function surface is divided into each segmentation with silencing apparatus;
Fig. 4 is the sectional view by a typical earthworm groove;
Fig. 5 is the preferred amount distribution as the preferred groove of the function of slot number;
Fig. 6 is the preferred amount distribution as the relative silencing apparatus total surface of preferred groove of the function of this slot number;
Fig. 7 is the preferred groove preferred allocation of this groove surfaces share relatively;
Fig. 8 is at typical groove (a 0, b 0, c 0) and at groove (a of the present invention 1, b 1, c 1) comparison of level of noise under the situation;
The function of known pocket is on a suppressor case, and primary is to improve the flexural rigidity of housing and improve the flow guide effect.In addition, the surface of this suppressor case is separated by function surface usually.These zonings of this surface of shell usually are applied as the seat of bottom.Then work as the reflecting cavity of silencing apparatus inside respectively in this zoning, therein, this noise should be able to dampedly weaken, and usually has parallelism between these lower seat.In order to improve flexural rigidity, the bottom of a minimum number should be set, set groove clocklike therein.In contrast, the configuration of groove of the present invention and/or layout can be determined according to the optimal method of a preferred amount, and its result realizes the noise reflection of small as far as possible silencing apparatus.
In optimal method of the present invention, at first implement the quantity detection of a gas pulses in silencing apparatus that is the detection of a pressure field p (x, t, u (x)).Wherein x characterizes a lip-deep position within a suppressor case.Because the wall thickness of this silencing apparatus and characteristic dimension are as length and width and highly to compare be small, therefore as optimal way for the numerical value of x interior-and outer surface between difference be negligible.T characterizes the time in addition, u (x) characterize a shift vector promptly one by the shift vector of the relative no groove silencing apparatus outer surface of groove silencing apparatus outer surface.Parameter u (x) just defines groove thus.Knowing with empirical data, often is insignificant for the coherence of this shift vector of pressure signal u (x).(x, t u) derive the velocity field v (x, t, u (x)) on the silencing apparatus outer surface based on pressure field p.This velocity field v (x, t, u (x)) causes the discharging of noise.So far the mark sheet of the surface of shell an of the best is present, and noise emission reduces or is limited on the numerical value of a permission.
In Fig. 1, describe one when the matrix that comprises two and half shells and several grooves that has a known manner from top silencing apparatus of the present invention when overlooking obliquely, figure 2 illustrates a view on the silencing apparatus bottom side of Fig. 1 simultaneously.This groove not only can extend to this silencing apparatus inside but also can from silencing apparatus extend out.Wherein the matrix two halves shell determined of this optimal way can be set to single wall or double-walled.
Silencing apparatus comprises a suppressor case 1, has at least one suction port 3 and a relief opening 4 of being used for waste gas, can dispose one or more common perforates and the pipe fitting that extends in the inside of silencing apparatus accordingly respectively with them.In surface of shell 2, embed one or more function surfaces 8 and one or more groove 5,6,7.Because for simplicity, the groove of not shown all existence, but they are in the accompanying drawings because its irregular shape should be identification easily.
Function surface 8 is divided into three interior segment sections 9 with silencing apparatus, has also connected the end piece of silencing apparatus 1 on it to both sides, and they are provided with groove 5,7 equally.Function surface 8 is a groove shaped, but their task primarily is to guarantee a lower seat of silencing apparatus.
Figure 3 illustrates the interior views of the silencing apparatus 1 of a no housing 2, the inside pipe fitting 11 that extends and the framework that is used for bottom 10 that therefore only are useful on exhaust gas routing can be seen.Bottom 10 is interrelated and define therebetween segmentation 9 with the position of function surface 8.Exhaust pulses in pipe fitting 11 is exactly the sound source of noise of being reflected.According to the housing situation that surrounds this layout, will many or few noise reflection take place.
Typical groove commonly known in the art is characterised in that a structural arrangements with high symmetry properties profile, and as trapezoidal groove, its cross section is trapezoidal or this earthworm groove for example.Under typical earthworm groove situation, can easily find a continuous symmetrical line, it so characterizes to the distance of recess edge, a point on promptly relative this symmetrical line can be found two opposite opposed marginal points, they are identical big to the gauged distance of this point on symmetrical line, and wherein each surface is considered and is parallel to surface of shell 1.
Under the earthworm groove situation that Fig. 4 a describes, at two marginal point R 1And R 2And the tangent line T on these two marginal points at the connecting line between the some P on the symmetrical line SP and this recess edge curve 1, T 2Two angle α have been produced respectively 1And β 1And α 2And β 2These angles α, the characteristic that β is general is α≤90 ° (± 0,5 °) and β 〉=90 ° (± 0,5 °), and alpha+beta=180 ° (± 1 °).The holding property that this in addition known groove has mostly is α 1=α 2(± 0,5 °), this generally is not this situation under according to optimization groove 5,6,7 situations of the present invention simultaneously.Be this angle [alpha] under earthworm groove situation of the present invention on the contrary, β can fluctuate, so α 1, α 2Be with at least ± 1 °, preferred ± skew of 10 ° and inequality.As selecting or adding angle [alpha] 1, and α 2Can be different and have ± 5 ° of preferred ± skews of 10 °.
In Fig. 4 b, shown a section A-A along this earthworm groove 4a ' sectional view.Wherein the interior profile IK of this earthworm groove has the shape of a sub-circular.But be configured to triangle or similar in the prior art in addition.Interior profile according to a groove of the present invention fluctuates.The bending radius of a variation for example can be set.Cross section can fluctuate along the interior profile of an ordinate L especially, and wherein this ordinate L is an extend longitudinally along this a groove parameter curve asymmetric arrangement of boundary curve, that characterize this groove length feature that extend, general relative this groove.Experience shows, the share that the usually this groove that makes nonuniformity soften (aufweichend) accounts for a minimum of groove sum then is necessary, so that realize reducing effectively the noise reflection, just can not realize desirable damping function so that for example in an end regions, for example in this end regions of Fig. 4 a E, have the groove of a nonuniformity.
Except groove, also exist in the prior art to have rotational symmetric groove, golf ball groove as already mentioned with vertical symmetry.Wherein symmetric element is agreed by rotating around a symmetry axis.According to the present invention, when according to target requiring to bear the nonuniformity of raising by the fluctuation of symmetric angle, just realizes this groove the raising of noise damping effect.The symmetrical line of known groove according to the groove type, for example when the golf ball groove, also can decay to symmetric points, because a golf ball groove may have many arbitrarily symmetrical surface.
The groove of bilateral symmetry is known in addition, and they can be divided into one side of something of two mirror image symmetries by a plane.The feature of groove correspondingly of the present invention is the wave properties of the symmetric element of this typical groove at least.
In this external known groove, between two marginal points, with the inclusive orthogonal distance departure of the point on the symmetrical line be up to this distinctive recess width ± 10%, be preferably ± 5%, be preferably especially ± 1%.These skews may be unsuitable owing to thereby fabrication tolerance produces by the present invention for example.
This known groove additional features is that its profile line constitutes by straight segmentation and basic evenly crooked zone, and under this feature situation, the curved section of matrix is not considered simultaneously.The radius of this surrounding edge is so arranged thus, and they in fact only set several interrupted numerical value.
Different with it, the configuration of groove 5,6,7 of the present invention and/or layout have the nonuniformity that requires according to purpose.The nonuniformity according to the purpose requirement of this groove 5,6,7 can have the one or more of following characteristic group according to the present invention:
-groove 5,6,7 configuration symmetry properties is reduced.This groove 5,6,7 is not have symmetrical line substantially with respect to their envelope curvers in this cutting plane in the cutting plane that is parallel to this surface of shell 2 especially.As preferably, this groove 5,6,7 10% and 90% between do not have the axis of symmetry or symmetrical line.Wherein requiring and to demarcate with planeness according to purpose, is that some points by local symmetry constitute because this groove is the symmetrical line of spatial configuration and groove according to prior art.
-single groove 5,6,7 has the distribution of a non-linear envelope with respect to the surperficial share on the surface of surface of shell 2, as a Gaussian distribution or a Poisson distribution etc.
The warp architecture that the peripheral curve of-this groove 5,6,7 has basic continuous distributed.Wherein the single relatively groove of the curve share that is bent of these groove 5,6,7 surrounding edges preferably is at least 30%.The straight line share of this peripheral curve is preferably minimum 10%, wherein about " straight line " preferably be understood that 1cm length at least and simultaneously on 1cm the departure of the highest 1mm should be discovered.Thus, the vault of the matrix of silencing apparatus 1 advantageously is removed.
The compression distance of the relative surface of shell of-this groove 5,6,7 fluctuates, and 80% of the surface on bottom portion of groove has a variable height of 30%, 40%, 50% or 60% for the darkest compression distance especially.This groove 5,6,7 is not the strip groove of straight line, and they do not have symmetrical line especially.
As preferably, this groove is positioned in the surface of shell with a nonuniformity that requires according to purpose in order to reduce the noise reflection.This configuration simultaneously can be along a vertical or horizontal realization of suppressor case (1).According to the position of this groove on surface of shell, even if especially under the unaltered situation of other structural member geometric profiles flexural rigidity also change.
Have in the cross section that is parallel to surface of shell at these grooves with the simple related surface of irregular profile, other grooves of the present invention then have a topological diagram (Topologie) with higher association.In Fig. 1, characterize a groove that has enclave (Enklave) with Sk, wherein one of the positioned inside of a groove not by the island of indent.These surface areas are characterized as being not by indent herein, and they belong to the original surface of silencing apparatus 1.Therefore in the simplest situation, can produce circular structure, but simultaneously nonuniformity by the external frame of groove or in it profile and this enclave or island profile or realize by both.Can also be provided with in addition and have more than one not by the complicated shape on the enclave of indent.
In preferred structure scheme of the present invention, single groove 5,6,7 with the institute fluted 5, surperficial share in the ratio of 6,7 all surfaces fluctuates, and particularly has so single groove 5,6,7, it has obviously risen on surface of other grooves 5,6,7 relatively with regard to its surface.This is depicted among Fig. 5.Therefore the great majority of this groove 5,6,7 have a less relatively surface.In 28 grooves 25 have one and are lower than 100cm in this embodiment 2The surface, and that a few independent groove has is obviously bigger up to 250cm 2The surface.
Groove 5,6, the warp architecture of 7 envelope curver are lower than another enforcement organization plan with broad distribution, and are characterized by a few discrete values.For example be provided with the bending radius of 2,3 or 4 different numerical value at least.Then has different numerical value when wherein bending radius is outside they are in predetermined tolerance band.For example deviant is 0,5mm, and 1mm, 2mm, 3mm or 5mm are particularly for having a surface＞1cm 2Groove.In addition as preferred, about 30% have surface＞1, a 5cm 2Groove 5,6,7 have the bending radius of ratio＞1,5.
With the whole surface ratio of silencing apparatus 1, the surperficial share of institute fluted 5,6,7 preferably mostly is most 50%, is preferably the highest by 30% especially.Groove surfaces share on bottoms 9 wherein single, that limit by function surface 8 at these can for housing 1 outer surfaces about 3% and about 70% between, preferably between 5% and about 60%.
With respect to the whole surface of silencing apparatus, the surface of single groove 5,6,7 be positioned at whole surface 0,05% and 10% between, preferably between 0,1% and 5%.This is depicted among Fig. 4.The great majority of groove, about 25 of 28 grooves have one and are the surperficial share on whole surface the highest 2% in this example, and that several less groove occupies is obviously bigger until 5% surperficial share.The absolute number of this groove is different when different silencing apparatuss certainly and is determined individually.
In Fig. 5, show the preferred distribution of groove of the present invention with respect to the groove surfaces share.Wherein horizontal ordinate has represented that groove opposite counts S, the apparent surface's share under ordinate is represented.Fluted integral body be characterized by a surperficial share 1 by a S/F=1.Producing straight line under the groove situation of identical size distributes.But preferably the relative slot number in surface is that a kind of sublinear distributes, as finding out on the curve below this straight line.A ratio is that surperficial share of generation is 0,1 under 0,4 situation.This means that 25% of groove of the present invention occupies one than 0,1 of the whole groove surfaces of the present invention groove few slightly surperficial share.At a numerical value is F/S=0, and 85 o'clock obtain a surperficial share is 0,6.This means that the groove near 75% occupies one 0,6 surperficial share.
Advantageously, the surface of single groove 5,6,7 relatively has than a departure of 50% more than mean value on the whole surface of institute fluted 5,6,7.
Further advantageously, the percentile distribution on single groove 5,6,7 surfaces is non-rectilinears with respect to surface of shell 2 whole surfaces.
At groove 5,6, in 7 the layout according to the purpose requirement, these grooves are asymmetrical mutually on two opposite opposed upper and lower casings of surface of shell 2, as can obviously finding out from the view contrast of Fig. 1 and 2.
In the transition region between groove and surface of shell (2), under groove situation of the present invention, be provided with the ladder that can have for the nonuniformity that reduces the noise reflection.When groove met or exceeded certain degree of depth given in advance, it was preferred having a bottom substantially parallel with surface of shell (2).But the groove with a kind of tilting bottom also is set, in particular for the groove of the less degree of depth.
Fig. 8 exemplarily shows the noise reflection of a silencing apparatus of the present invention as an engine speed function.Function surface 8 is split up into three zones with suppressor case 1.They have groove respectively.Curve a wherein 0, a 1Expressed the noise reflection of suppressor case 1 left area, b 0, b 1Expressed the noise reflection in zone, the right, c 0, c 1Expressed the noise reflection of zone line.Noise is reflected on the certain distance of suppressor case 1 determines that this distance will be enough to differentiate by the zones of different of Principles of Acoustics with silencing apparatus, and one of them noise reflection is with a hybrid frequency generation about 250Hz.This set of curves a 0, b 0, c 0Obtain by a silencing apparatus that is provided with general groove commonly used.All three curves increase along with the mean engine revolution and climb monotonously, for example a 0, b 0In this example in 1000 and 5000l/min between the time rise to maximum 100dB from about 70, wherein the zone in the middle of produces a noise that reflects the roughly the same big little about 5dB of end regions than those two its noises and reflects.
If the suppressor case structure of a same form is provided with groove 5,6,7 of the present invention, then the display noise reflection obviously reduces.The noise reflection is according to set of curves a 1, b 1, c 1Than set of curves a with known groove 0, b 0, c 0Mean value want little about 10dB.In order to produce the damping function of a comparable noise reflection levels, a silencing apparatus of the present invention has a fewer purpose polycrystalline substance of silencing apparatus of comparing typical embodiments just can have been satisfied.So just can simplify the manufacturing, correspondingly have the savings potential aspect manufacture cost, process time and instrument simultaneously.As preferably, the number of bottom 9 is compared with a layout with regular groove can be reduced by at least a bottom 9.Under the situation of the bottom of similar number, can obviously reduce the noise reflection on the other hand by groove 5,6,7 of the present invention.

Claims (15)

1. silencing apparatus has a suppressor case (1) and is used at least one suction port (3) and at least one relief opening (4) of waste gas, and wherein this surface of shell (2) has one or more grooves (5,6,7), it is characterized in that:
Configuration of this groove (5,6,7) and/or layout have suitable nonuniformity to be used to reduce this noise reflection.
2. by the silencing apparatus of claim 1, it is characterized in that:
Described suitable nonuniformity relates to one or more in the groove following properties:
The configuration or the symmetry properties of-groove (5,6,7),
The surface of-single groove (5,6,7) is with respect to the Size Distribution of this surface of shell (2),
The bending of the peripheral curve of-groove (5,6,7) distributes,
The distribution of-groove (5,6,7) on surface of shell (2).
3. by the silencing apparatus of claim 1 or 2, it is characterized in that:
Groove between 5% and 100% (5,6,7) in the cutting plane that is parallel to surface of shell (2) with respect to their envelope curvers in this cutting plane be essentially no symmetrical line or do not have symmetric points.
4. by claim 1 to 3 silencing apparatus one of at least, it is characterized in that:
5% and 100% of this groove (5,6,7) quantity has and a kind ofly has at least 2,3, or warp architecture 4 differently curved radiuses or that the envelope curver of a basic continuous distributed is arranged.
5. by at least one silencing apparatus of aforementioned claim, it is characterized in that:
On the surface of shell that is arranged in bottom and upper segment (2) of this groove (5,6,7) is different.
6. by at least one silencing apparatus of aforementioned claim, it is characterized in that:
The surface of single groove (5,6,7) has 50% departure more than mean value with respect to the total surface of institute fluted (5,6,7).
7. by at least one silencing apparatus of aforementioned claim, it is characterized in that:
The surface of single groove (5,6,7) is non-linear with respect to the percent profile of surface of shell (2) total surface.
8. by at least one silencing apparatus of aforementioned claim, it is characterized in that:
The share that the total surface of this groove (5,6,7) occupies surface of shell (2) is 30%, 40% or 50% to the maximum.
9. by at least one silencing apparatus of aforementioned claim, it is characterized in that:
The function surface (8) that limits bottom (10) is set in surface of shell (2).
10. by the silencing apparatus of claim 9, it is characterized in that:
Between the segmentation (9) of the residing surface of shell of function surface (8) (2), the share of this groove surfaces be respective surfaces 5% and 60% between.
11. the silencing apparatus by claim 10 is characterized in that:
Two or more segmentations (9) are set.
12., it is characterized in that by at least one silencing apparatus of aforementioned claim:
The surface of single groove (5,6,7) be surface of shell (2) 0,05% and 10% between.
13. the silencing apparatus by claim 12 is characterized in that:
The surface of single groove (5,6,7) be surface of shell (2) 0,1% and 5% between.
14., it is characterized in that by at least one silencing apparatus of aforementioned claim:
The number of this bottom (10) is compared with a silencing apparatus (1) that has regular groove accordingly and is reduced at least one bottom (10).
15. be used to design a method, it is characterized in that according to one of front claim 1-14 silencing apparatus:
Configuration of this groove (5,6,7) and/or the suitable nonuniformity of structural arrangements according to the noise reflection of this silencing apparatus, are determined by an optimal method.
CNB038220709A 2002-09-17 2003-09-17 Sound damper and structural design method therefor Expired - Fee Related CN100366868C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10243225A DE10243225A1 (en) 2002-09-17 2002-09-17 Sound damper contained in housing with surface containing flanges and inlet and outlet for exhaust gas
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CN102985194A (en) * 2010-05-18 2013-03-20 田纳科有限责任公司 Exhaust gas muffler for internal combustion engines and deep drawing tool therefor
CN106847255A (en) * 2017-03-10 2017-06-13 南京大学 A kind of three-dimensional broadband Schroeder diffusor
CN107532499A (en) * 2015-04-20 2018-01-02 佛吉亚排气系统有限公司 Muffler with main casing and partial shell and the method for manufacturing the muffler
CN113482756A (en) * 2021-08-20 2021-10-08 泰豪电源技术有限公司 Exhaust muffler modular design method

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DE202008016200U1 (en) * 2008-12-06 2009-03-12 Heinrich Gillet Gmbh Muffler for exhaust systems
DE102010062569A1 (en) * 2010-12-07 2012-06-14 J. Eberspächer GmbH & Co. KG casing
DE102017124750A1 (en) 2017-10-23 2019-04-25 Eberspächer Exhaust Technology GmbH & Co. KG Muffler insert, muffler with this and method of making a muffler insert

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102985194A (en) * 2010-05-18 2013-03-20 田纳科有限责任公司 Exhaust gas muffler for internal combustion engines and deep drawing tool therefor
CN107532499A (en) * 2015-04-20 2018-01-02 佛吉亚排气系统有限公司 Muffler with main casing and partial shell and the method for manufacturing the muffler
CN107532499B (en) * 2015-04-20 2019-12-13 佛吉亚排气系统有限公司 Muffler having a main housing and a partial housing and method for producing the muffler
CN106847255A (en) * 2017-03-10 2017-06-13 南京大学 A kind of three-dimensional broadband Schroeder diffusor
CN113482756A (en) * 2021-08-20 2021-10-08 泰豪电源技术有限公司 Exhaust muffler modular design method
CN113482756B (en) * 2021-08-20 2022-11-04 泰豪电源技术有限公司 Exhaust muffler modular design method

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WO2004027231A2 (en) 2004-04-01
EP1540148B1 (en) 2007-04-11
DE10243225A1 (en) 2004-03-25
ATE359434T1 (en) 2007-05-15
ES2285197T3 (en) 2007-11-16
EP1540148A2 (en) 2005-06-15
WO2004027231A3 (en) 2004-04-29
CN100366868C (en) 2008-02-06

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