EP1382031A1 - Schalldämpfer - Google Patents
SchalldämpferInfo
- Publication number
- EP1382031A1 EP1382031A1 EP02740525A EP02740525A EP1382031A1 EP 1382031 A1 EP1382031 A1 EP 1382031A1 EP 02740525 A EP02740525 A EP 02740525A EP 02740525 A EP02740525 A EP 02740525A EP 1382031 A1 EP1382031 A1 EP 1382031A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- silencer according
- cover
- perforated
- flat structures
- silencer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/001—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by provisions for heat or sound insulation
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/34—Grid-like or open-work ceilings, e.g. lattice type box-like modules, acoustic baffles
- E04B9/36—Grid-like or open-work ceilings, e.g. lattice type box-like modules, acoustic baffles consisting of parallel slats
- E04B9/366—Grid-like or open-work ceilings, e.g. lattice type box-like modules, acoustic baffles consisting of parallel slats the principal plane of the slats being vertical
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
Definitions
- the invention relates to a silencer according to the preamble of claim 1, as is known for example from DE 197 30 355 C1.
- Sound absorbers and silencers largely consist of more or less homogeneous porous or fibrous material in front of a hard wall or in a housing. Its thickness D defines the lower frequency at which almost complete absorption of the incident sound waves can still be achieved.
- the alternating movement of the air particles as a result of the sound wave is converted into heat on the way from the entry into the passive absorber to the wall and from the wall to the exit from the absorber by friction in the pores or on the fibers (FIG. 1 (a)) ,
- a similar absorption / damping can also be achieved if you ensure that a suitable flow resistance in the form e.g. a nonwoven is stretched, e.g. on perforated sheet with sufficiently large (> 20%) and perforations distributed as evenly as possible in the form of holes or slots (Fig. 1 (b)).
- the hole geometry of the microperforated absorber 5 can be selected in accordance with D and the thickness t of the cover so that the friction in the holes 6 itself causes the maximum possible absorption.
- Such sound absorbers are described in DE 43 15 759 C1 and EP 0 679 051 B1, to which express reference is made with regard to the effects and technical configurations of the sound absorbers.
- these clad cavities 2 in front of the wall with an almost closed reverberant layer even at a certain higher frequency the wavelength of which corresponds to approximately 4 D, and odd multiples of this frequency, further absorption maxima can be excited.
- Mufflers in and on noisy devices and systems mainly consist of sensitive passive layers of porous or fibrous material in front of reverberant walls or cavities provided for this purpose.
- Reactive silencers which owe their effectiveness to the reflective effect of hollow chambers and deflections in the flow and sound routing (e.g. in the exhaust line of internal combustion engines), can be acoustically improved by making porous, fibrous or at least in places in the flowed through or overflowed silencer chambers otherwise finely structured damping material is introduced.
- the high levels of airborne noise and vibrations that often prevail here, as well as high temperatures and pollution from the exhaust gases practically prohibit the use of conventional, mechanically less resistant fibers and foams.
- the object of the invention is therefore to provide a silencer with microperforated components, the z. B. is designed to be sufficiently robust for the motor vehicle sector, ie is robust enough against the exhaust gas temperature and absorbs broadband sound. According to the invention this is achieved by the silencer with microperforated components according to claim 1.
- Advantageous refinements are characterized in the subclaims.
- the absorbers and silencers according to the invention consist of a cover or casing 1, e.g. a plate or film made of plastic or metal, which covers or envelops a cavity 2, in which micro-perforated plates or foils 3 are also folded in such a way that the cavity 1 is divided into many smaller to very small cavities 4 by these flat structures 3 (Fig. 3). All of these partial cavities 4 are therefore surrounded by microperforated borders, that is to say the flat structures 3, and are connected to one another aerodynamically and acoustically. All of the interior sheet-like structures 3 find a mechanically secure hold among one another and on the outer shell 1, cavity wall and cover of the large cavity 2.
- a cover or casing e.g. a plate or film made of plastic or metal, which covers or envelops a cavity 2, in which micro-perforated plates or foils 3 are also folded in such a way that the cavity 1 is divided into many smaller to very small cavities 4 by these flat structures 3 (Fig. 3). All of these partial cavities 4 are therefore
- the inner planar structures themselves have sufficient rigidity, they can be rigidly connected to the cover or cover 1 or can be clamped, glued or welded in a form-fitting manner therefrom (FIG. 3 (a)).
- the cavities 2 of the muffler according to Fig.ld, e, f are thus divided into small cavities 4 by the sheet 3 according to the invention.
- the interior fabrics consist of relatively thin ( ⁇ 1 mm) soft and / or resilient foils (Fig. 3 (b)). can either also be attached to the boundary 1 or firmly enclosed by this, for. B. are literally packed like a pillow (Fig. 3 (c)).
- the cushion cover is made soft, flexible and / or springy and microperforated, silencer packs can be produced in this way, which are introduced into the hollow chambers provided for this purpose, e.g. blind holes in a machine housing or on or in a flow channel or press and have it permanently fixed with simple locks.
- prefabrication as a complete pipe or link silencer in suitable housings or frame constructions as described below is also possible.
- the absorption spectrum of a muffler module according to the invention is compared in FIG. 4 with the results of conventional homogeneous fibrous or porous absorber layers (without acoustically effective covers). It approximates the traditional absorption characteristics at a construction depth of 100 mm, although the flat structures used here, which have in no way been acoustically optimized, only materially fill a small fraction of the cavity. In this module, only 0.1 mm thick metal foils made of aluminum were used, which were only partially provided with approx. 0.2 mm holes at a distance of 2 mm. Even better results are possible with more uniform microperforations of the flat structures, which vary in the hole size and film thickness.
- Foils made of steel with a thickness of up to 60 ⁇ have very favorable material properties for the use of the flat structure.
- Zinc sheet with a thickness of ⁇ 0.1 mm can also be used for this.
- the damping spectrum can be a little more uniform and expanded to slightly lower frequencies, e.g. B. by the thickness and room size of the cover or cover is tuned to lower frequencies.
- the preferred embodiment of the silencer module according to the invention consists only of relatively smooth, coherent, microperforated flat structures.
- the component according to the invention has the advantage that its internal flat structures and its casing can be easily taken apart, cleaned and reinstalled.
- the relatively large, coherent, microperforated fabrics can better absorb and withstand hard impacts and sustained vibrations than thin, disjointed fibers, webs or foams, whose delicate structures are indispensable for their acoustic effectiveness, but disadvantageous for their durability and harsh operating conditions.
- the supporting structure of the damping material must at the same time follow the acoustic requirements (small fiber thicknesses, thin pore walls)
- the mechanical cohesion of the entire silencer module, both in its wrapping and in its filling is relatively large stable or / and flexible, almost closed and, when unfolded, smooth fabrics are guaranteed.
- the acoustic function is completely detached from the mechanical function and transferred to a large number of tiny holes that in no way weaken the muffler structure, which, unlike the fibers and pores, are not exposed to any mechanical stress and are affected by the air excited in them -Clean the alternating movement on top of that.
- the silencer with its micro-perforated components is particularly important for exhaust systems from
- the sound-absorbing linings 7 are provided with thick lines in these images in FIG. They often consist of anti-drumming materials, which are also used in automotive engineering, or they consist of merely reactive cell structures with a construction depth of 0.5 to 5 cm, which, however, are only ever effective in a very narrow frequency range [P. Nelson (ed): Transportation Noise Reference Book, Bultterworth, Cambridge 1987].
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Architecture (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Exhaust Silencers (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10120727 | 2001-04-27 | ||
| DE10120727 | 2001-04-27 | ||
| PCT/EP2002/004636 WO2002089110A1 (de) | 2001-04-27 | 2002-04-26 | Schalldämpfer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1382031A1 true EP1382031A1 (de) | 2004-01-21 |
| EP1382031B1 EP1382031B1 (de) | 2006-07-12 |
Family
ID=7682968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02740525A Expired - Lifetime EP1382031B1 (de) | 2001-04-27 | 2002-04-26 | Schalldämpfer |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1382031B1 (de) |
| AT (1) | ATE333134T1 (de) |
| DE (1) | DE50207500D1 (de) |
| WO (1) | WO2002089110A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1953354A1 (de) * | 2003-08-11 | 2008-08-06 | ArvinMeritor Emissions Technologies GmbH | Abgasschalldämpfer |
| DE10337110A1 (de) * | 2003-08-11 | 2005-03-17 | Zeuna-Stärker GmbH & Co. KG | Abgasschalldämpfer |
| EP1507071B2 (de) * | 2003-08-11 | 2019-10-16 | Faurecia Emissions Control Technologies, Germany GmbH | Abgasschalldämpfer |
| CN101164101A (zh) | 2005-03-18 | 2008-04-16 | 图美企业有限公司 | 隔音的流动通道装置 |
| DE102014226266A1 (de) | 2014-12-17 | 2016-06-23 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Dämm- und Filterstoff und seine Verwendung als inertes schallabsorbierendes Material |
| CN107204182A (zh) * | 2017-07-06 | 2017-09-26 | 江苏华强新能源科技有限公司 | 一种新型消音器 |
| CN108665886B (zh) * | 2018-05-23 | 2024-05-14 | 南京邮电大学 | 一种具有共振吸声结构的刚性超薄穿孔板吸收体 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4312885A1 (de) * | 1993-04-20 | 1994-10-27 | Fraunhofer Ges Forschung | Unterdecke |
| DE19626676A1 (de) * | 1996-07-03 | 1998-01-08 | Kaefer Isoliertechnik | Vorrichtung zur Verminderung von Schallpegeln in Gebäuden |
| DE19754107C1 (de) * | 1997-12-05 | 1999-02-25 | Fraunhofer Ges Forschung | Schallabsorber |
-
2002
- 2002-04-26 DE DE50207500T patent/DE50207500D1/de not_active Expired - Lifetime
- 2002-04-26 WO PCT/EP2002/004636 patent/WO2002089110A1/de not_active Ceased
- 2002-04-26 AT AT02740525T patent/ATE333134T1/de not_active IP Right Cessation
- 2002-04-26 EP EP02740525A patent/EP1382031B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO02089110A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002089110A1 (de) | 2002-11-07 |
| EP1382031B1 (de) | 2006-07-12 |
| DE50207500D1 (de) | 2006-08-24 |
| ATE333134T1 (de) | 2006-08-15 |
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