EP1051562A1 - Silencer with a shunt resonator - Google Patents
Silencer with a shunt resonatorInfo
- Publication number
- EP1051562A1 EP1051562A1 EP98963457A EP98963457A EP1051562A1 EP 1051562 A1 EP1051562 A1 EP 1051562A1 EP 98963457 A EP98963457 A EP 98963457A EP 98963457 A EP98963457 A EP 98963457A EP 1051562 A1 EP1051562 A1 EP 1051562A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound
- shunt resonator
- tubular elements
- silencer
- channel
- 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
-
- 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
- F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
- F01N1/006—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages comprising at least one perforated tube extending from inlet to outlet of the silencer
-
- 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
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
-
- 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
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/023—Helmholtz resonators
-
- 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
-
- 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
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/15—Plurality of resonance or dead chambers
- F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
-
- 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
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/20—Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers
Definitions
- the invention relates to a silencer with a shunt resonator according to the preamble of the main claim.
- the invention has for its object to design a muffler of the type mentioned in such a way that the damping behavior of the muffler can be calculated and influenced in a simple manner as a function of the sound frequency.
- the muffler according to the invention is advantageously suitable, starting from the generic type, to solve the task with the characterizing features of the main claim. Because the acoustically active openings in the intake duct consist of tubular elements that extend from the intake duct into the housing volume of the shunt resonator, the damping behavior can be positively influenced by suitable dimensioning and arrangement of these tubular elements.
- the changeable tubular elements as openings in the intake duct are particularly advantageous because they allow the shunt resonator, also called the Helmholtz resonator in the shunt, to be easily tuned for damping even low frequencies.
- the volume of the shunt resonator is defined by the annular space between the intake duct and the outer housing, the design of the acoustic neck through the pipe elements taking a primary position.
- the number and position of the tubular elements as well as their length and their diameter are advantageously chosen so that their acoustic damping gains are formed in a predetermined frequency range.
- the position of the pipe elements in relation to the center of the shunt resonator can be shifted in the longitudinal direction so that occurring damping losses due to interaction with other components surrounding the silencer are shifted to frequency ranges in which this is not disturbing; in the best case, this can in turn lead to a gain in damping.
- the sound-guiding duct is the intake duct for the intake air of an internal combustion engine, and the sound emissions to be damped are caused by the intake impulses of the individual cylinders, in particular of a diesel engine.
- the muffler according to the invention can advantageously be manufactured in that the area with the pipe elements in the sound-conducting channel can be inserted as an injection molded part between two ends in the suction channel and that the enclosing housing volume of the shunt resonator, each with a housing half, is attached to one end of the channel and the two housing halves can be firmly joined together, including the injection molded part.
- the tubular elements can also be produced separately and individually added and extrusion-coated during the production of the injection molded part.
- FIG. 1 shows a section through an intake duct for the intake air of an internal combustion engine with tubular elements in the shunt resonator
- Figure 2 shows a detail section through the intake duct in the area of the tubular elements
- Figure 3 is a diagram of the damping curve as a function of frequency with different arrangements of the tubular elements.
- an intake duct 1 is shown as a sound duct, which ensures the intake of intake air 2 of an internal combustion engine, which is not explained in more detail here.
- the intake duct 1 is interrupted at one end 3 and 4 and includes an injection molded part 5, which is provided with pipe elements 6 as sound-conducting openings.
- the injection molded part 5 is house parts 7 and 8 surrounded, which are fixedly attached to the pipe ends 3 and 4 and are tightly connected at a seam 9.
- the middle of the area in which the tubular elements 6 are arranged is not in the center within the housing parts 7 and 8; dimension a is given here as the reference quantity, as the distance from the exciter side.
- the housing volume between the housing parts 7 and 8 and the injection molded part 5 and the adjoining areas of the intake duct 1 forms a shunt resonator 10 for the acoustic vibrations of the pulsating intake air.
- the operation of the silencer according to the invention is also described below with reference to FIG. 2, which shows the molded part 5 in section and will be explained with reference to FIG. 3, which shows a damping diagram of the sound vibrations.
- the damping behavior of the arrangement shown in FIG. 1 can be influenced by the number, the position and the dimensions of the tubular elements 6.
- the formula used here to calculate the resonance frequency f res of the silencer is:
- V represents the housing volume of the shunt resonator 10.
- a growing length L of the tubular elements 6 can thus bring about a reduction in the resonance frequency f res .
- This has advantages for use in internal combustion engines because the shunt resonator 10 is primarily in its resonance contributes to damping and the high sound energies in the intake duct occur at relatively low frequencies.
- the sum of all opening areas and thus the acoustically effective area A results from the number of tubular elements 6 and thus the openings.
- the length L of the individual tubular elements 6 determines the overall acoustically effective length.
- damping losses also occur with this arrangement.
- the position of the so-called break-in frequencies f A and f B , at which these damping losses occur, can be influenced by the width and position of the area in which the tubular elements 6 are located in the intake duct 1 and thus also within the shunt resonator 10.
- the dimension a shown in FIG. 1 and the number z of the tubular elements 6 can be changed here in such a way that the undesired damping losses are shifted into frequency ranges in which this is less disturbing. If, for example, the number z of the rows or the diameter D of the tubular elements 6 is increased, the resonance frequency f res becomes greater because of the thus increased acoustically effective area A. However, if you change the position of the area of the tubular elements 6 from the center position in the shunt resonator 10, it does not have an influence on the resonance frequency f res that has to be taken into account, but it does have an influence on the position of the break-in frequencies f A and f B. The decisive factor here is dimension a, which indicates the position of the area of the tubular elements 6 relative to the exciter side in the intake duct 1.
- a shunt resonator 10 can have the surprising effect of a desired damping instead of a sound amplification even at certain frequency positions with damping losses. If, as in the exemplary embodiment according to the invention, this effect can be calculated and thus influenced, this can be used in an advantageous manner.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19751940A DE19751940C1 (en) | 1997-11-24 | 1997-11-24 | Intake silencer for motor vehicle internal combustion engine |
DE19751940 | 1997-11-24 | ||
PCT/EP1998/007296 WO1999027237A1 (en) | 1997-11-24 | 1998-11-14 | Silencer with a shunt resonator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1051562A1 true EP1051562A1 (en) | 2000-11-15 |
EP1051562B1 EP1051562B1 (en) | 2002-03-06 |
Family
ID=7849612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98963457A Expired - Lifetime EP1051562B1 (en) | 1997-11-24 | 1998-11-14 | Silencer with a shunt resonator |
Country Status (8)
Country | Link |
---|---|
US (1) | US6341663B1 (en) |
EP (1) | EP1051562B1 (en) |
JP (1) | JP2001524635A (en) |
BR (1) | BR9815023A (en) |
CA (1) | CA2311383C (en) |
DE (2) | DE19751940C1 (en) |
ES (1) | ES2174526T3 (en) |
WO (1) | WO1999027237A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19902951A1 (en) * | 1999-01-26 | 2000-07-27 | Mann & Hummel Filter | Induction device for internal combustion engine, in which resonance tube has common wall sector with line sector |
US7159692B1 (en) * | 1999-10-11 | 2007-01-09 | Silentor Holding A/S | Silencer |
US8820325B2 (en) * | 2002-10-11 | 2014-09-02 | The Regents Of The University Of California | Bymixer apparatus and method for fast-response, adjustable measurement of mixed gas fractions in ventilation circuits |
DE202005007714U1 (en) * | 2005-05-11 | 2006-09-21 | Mann + Hummel Gmbh | silencer |
KR100710342B1 (en) * | 2006-02-07 | 2007-04-23 | 엘지전자 주식회사 | Silencer |
BRPI0601716B1 (en) * | 2006-05-03 | 2018-09-25 | Empresa Brasileira De Compressores S A Embraco | acoustic filter resonator arrangement for refrigeration compressor |
KR101807783B1 (en) * | 2012-06-18 | 2018-01-18 | 목포해양대학교 산학협력단 | Soundproof duct for ship propellors using resonators |
EP3467276B1 (en) * | 2013-02-12 | 2021-04-07 | Faurecia Emissions Control Technologies, USA, LLC | Vehicle exhaust system with resonance damping |
CN104500178B (en) * | 2013-11-27 | 2016-11-09 | 广东西电动力科技股份有限公司 | A kind of complex muffler preventing and treating diesel generating set low-frequency noise |
JP7005866B2 (en) * | 2016-03-14 | 2022-01-24 | 株式会社竹中工務店 | Exhaust noise reduction device |
KR101943607B1 (en) * | 2017-05-18 | 2019-01-29 | 성균관대학교산학협력단 | Acoustic resonator |
DE102017130661A1 (en) * | 2017-12-20 | 2019-06-27 | Montaplast Gmbh | Broadband damper for a motor vehicle engine |
DE102022001220A1 (en) * | 2022-04-09 | 2023-10-12 | Hydac Technology Gmbh | Damping device |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE739460C (en) * | 1940-07-30 | 1943-09-27 | Eberspaecher J | Sound absorption in lines with a smooth passage to which resonators of different natural frequencies are connected |
US2765044A (en) * | 1951-07-18 | 1956-10-02 | Hatte Jacques Louis | Sound filtering apparatus |
DE1147769B (en) * | 1959-04-10 | 1963-04-25 | Sulzer Ag | Resonator |
DE1244476B (en) * | 1960-12-23 | 1967-07-13 | Sulzer Ag | Exhaust silencer |
DE2508261A1 (en) * | 1975-02-26 | 1976-09-09 | Karl Wilhelm Dipl Sessinghaus | Exhaust silencer for motor vehicle engines - has rust resistant housing holding replaceable plastics noise absorbing cartridge |
US4231447A (en) * | 1978-04-29 | 1980-11-04 | Rolls-Royce Limited | Multi-layer acoustic linings |
IT7853327V0 (en) * | 1978-05-17 | 1978-05-17 | Fiat Spa | EXHAUST SILENCER FOR AGRICULTURAL TRACTORS |
CH647302A5 (en) * | 1979-06-06 | 1985-01-15 | Alusuisse | DEVICE FOR DISCHARGING EXHAUST GAS FROM COMBUSTION ENGINES. |
JPH07101002B2 (en) * | 1987-12-22 | 1995-11-01 | 日産自動車株式会社 | Resonance silencer |
DE9419022U1 (en) * | 1994-11-26 | 1995-01-26 | Fa. J. Eberspächer, 73730 Esslingen | Resonator silencer |
US5545860A (en) * | 1995-02-21 | 1996-08-13 | Ford Motor Company | Discharge muffler for an automotive compressor and method for making same |
-
1997
- 1997-11-24 DE DE19751940A patent/DE19751940C1/en not_active Expired - Fee Related
-
1998
- 1998-11-14 DE DE59803310T patent/DE59803310D1/en not_active Expired - Lifetime
- 1998-11-14 EP EP98963457A patent/EP1051562B1/en not_active Expired - Lifetime
- 1998-11-14 WO PCT/EP1998/007296 patent/WO1999027237A1/en active IP Right Grant
- 1998-11-14 US US09/555,054 patent/US6341663B1/en not_active Expired - Lifetime
- 1998-11-14 BR BR9815023-5A patent/BR9815023A/en active Search and Examination
- 1998-11-14 CA CA002311383A patent/CA2311383C/en not_active Expired - Fee Related
- 1998-11-14 JP JP2000522357A patent/JP2001524635A/en not_active Withdrawn
- 1998-11-14 ES ES98963457T patent/ES2174526T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9927237A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2311383A1 (en) | 1999-06-03 |
EP1051562B1 (en) | 2002-03-06 |
WO1999027237A1 (en) | 1999-06-03 |
DE19751940C1 (en) | 1999-03-25 |
US6341663B1 (en) | 2002-01-29 |
DE59803310D1 (en) | 2002-04-11 |
BR9815023A (en) | 2002-04-30 |
ES2174526T3 (en) | 2002-11-01 |
CA2311383C (en) | 2007-05-15 |
JP2001524635A (en) | 2001-12-04 |
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