[go: up one dir, main page]

DE20003519U1 - Helmholtz resonator - Google Patents

Helmholtz resonator

Info

Publication number
DE20003519U1
DE20003519U1 DE20003519U DE20003519U DE20003519U1 DE 20003519 U1 DE20003519 U1 DE 20003519U1 DE 20003519 U DE20003519 U DE 20003519U DE 20003519 U DE20003519 U DE 20003519U DE 20003519 U1 DE20003519 U1 DE 20003519U1
Authority
DE
Germany
Prior art keywords
helmholtz
helmholtz resonator
volume
switching element
pipe
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.)
Expired - Lifetime
Application number
DE20003519U
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE20003519U priority Critical patent/DE20003519U1/en
Publication of DE20003519U1 publication Critical patent/DE20003519U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023—Helmholtz resonators
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/165—Silencing apparatus characterised by method of silencing by using movable parts for adjusting flow area
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/166—Silencing apparatus characterised by method of silencing by using movable parts for changing the flow path through the silencer or for adjusting the dimensions of a chamber or a pipe
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/14—Exhaust treating devices having provisions not otherwise provided for for modifying or adapting flow area or back-pressure
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • 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

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)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Exhaust Silencers (AREA)

Description

• · · · &phgr; t · &phgr; &phgr; &phgr;• · · · φ t · φ φ φ

Beschreibung:Description:

HelmholtzresonatorHelmholtz resonator

In der Technischen Akustik werden Helmholtzresonatoren überwiegend zur Reduzierung schmalbandiger Geräusche im tiefifrequenten Bereich eingesetzt. Hochfrequente Geräuschanteile lassen sich im allgemeinen durch einfachere akustische Bauprinzipien (z.B. Absorptionsmaterialien) mit geringem Volumenbedarf bedampfen.In technical acoustics, Helmholtz resonators are mainly used to reduce narrowband noise in the low-frequency range. High-frequency noise components can generally be dampened using simpler acoustic construction principles (e.g. absorption materials) with low volume requirements.

Ein typisches Anwendungsbeispiel fur Helmholtzresonatoren sind Abgasanlagen von Kraftfahrzeugen:A typical application example for Helmholtz resonators are exhaust systems of motor vehicles:

Die Motorverbrennungsgeräusche erzeugen im Zündtakt hohe schmalbandige Schalldruckpegel („Zündharmonische"), zur Reduzierung deren Grundordnung der Helmholtzresonator ausgelegt wird.The engine combustion noise generates high narrow-band sound pressure levels ("ignition harmonics") during the ignition cycle, and the Helmholtz resonator is designed to reduce this basic order.

Dieser wirkt bekanntlich analog einem Feder/Masse-System, wobei als Masse die schwingende Luftsäule im Rohr und als Feder die kompressible Luft im Volumen wirkt.As is well known, this works analogously to a spring/mass system, where the vibrating air column in the tube acts as the mass and the compressible air in the volume acts as the spring.

In praktischer Ausführung besteht ein Helmholtzresonator aus einem an ein durchströmtes Rohr oder an ein Schalldämpfervolumen angeschlossenen Rohrstück und einem daran angekoppelten abgeschlossenen Volumen. Oft werden relativ große Hehnholtzvolumina erforderlich, die nur in der Auslegefrequenz aktiv sind und für eine breitbandige Dämpfung bei anderen vorkommenden Frequenzen nicht zur Verfügung stehen. Das Volumen wird über ein Rohr mit definierter Länge und definiertem Durchmesser angekoppelt, in dem die Luftsäule wie beschrieben in einem schmalen Frequenzband schwingt, aber ansonsten wird dieses Rohr nicht durchströmt.In practical terms, a Helmholtz resonator consists of a pipe section connected to a pipe through which air flows or to a silencer volume and a closed volume coupled to it. Often relatively large Helmholtz volumes are required which are only active at the design frequency and are not available for broadband damping at other frequencies. The volume is coupled via a pipe with a defined length and diameter in which the air column oscillates in a narrow frequency band as described, but otherwise no air flows through this pipe.

Weiterhin müssen die anderen Rohrquerschnitte im System unabhängig vom Helmholtzrohr für den maximal zulässigen Gegendruck entsprechend groß ausgelegt sein, weil keine By-Pass-Strömung durch das Helmholtzsystem möglich ist. Diese würde den Helmholtzresonator außer Funktion setzen. Zur wirksamen Bedämpfung niedriger Frequenzen ist es aber erforderlich, Rohrquerschnitte so klein wie möglich zu halten.Furthermore, the other pipe cross-sections in the system must be designed to be large enough to withstand the maximum permissible back pressure, independent of the Helmholtz pipe, because no bypass flow through the Helmholtz system is possible. This would disable the Helmholtz resonator. However, to effectively dampen low frequencies, it is necessary to keep pipe cross-sections as small as possible.

Der im Schutzanspruch angegebenen Erfindung liegt das Problem zugrunde, einen Typ eines Helmholtzresonators zu schaffen, der wie ein konventioneller Helmholtzresonator im tieffrequenten Teil hochwirksam dämpft, darüber hinaus zusätzlich sein Volumen für die Bedämpfung aller anderen Frequenzen dem akustischen Gesamtsystem „zur Verfügung stellt" und schließlich eine By-Pass-Strömung durch den Helmholtzresonator ermöglicht, damit das Restdämpfungssystem mit kleinen Strömungsquerschnitten zur Erzielung einer hohen Dämpfung ausgerüstet werden kann.The invention specified in the protection claim is based on the problem of creating a type of Helmholtz resonator which, like a conventional Helmholtz resonator, provides highly effective damping in the low-frequency part, in addition to "making its volume available" to the overall acoustic system for damping all other frequencies and finally enabling a bypass flow through the Helmholtz resonator so that the residual damping system can be equipped with small flow cross-sections to achieve high damping.

Dieses Problem wird mit einem schaltbaren durchströmtem Helmholtzresonator mit den im Schutzanspruch aufgeführten Merkmalen gelöst.This problem is solved with a switchable flow-through Helmholtz resonator with the features listed in the protection claim.

Als Schaltelement können system- oder fremdgesteuerte Klappen, Ventile, etc.,wie sie bereits heute in Abgassystemen eingesetzt werden, verwendet werden.System- or externally controlled flaps, valves, etc., as already used in exhaust systems today, can be used as switching elements.

Bei geschlossenem Schaltelement ist der Helmholtzresonator konventionell angekoppelt und reduziert den Schallpegel entsprechend Auslegung.When the switching element is closed, the Helmholtz resonator is conventionally coupled and reduces the sound level according to the design.

Durch Öffnen des Schaltelements wird die Helmholtzkammer durchströmt und „nutzt" ihr Volumen als breitbandiges Dämpfungssystem.By opening the switching element, the Helmholtz chamber is flowed through and "uses" its volume as a broadband damping system.

Da ein Helmholtzvolumen ohne weiteres die Hälfte des im Schalldämpfer zur Verfügung stehenden Volumens einnimmt, kann sich somit aufgrund der erfindungsgemäßen Helmholtzdurchströmung die Dämpfung verdoppeln.Since a Helmholtz volume easily takes up half of the volume available in the silencer, the attenuation can be doubled due to the Helmholtz flow according to the invention.

Durch das Öffnen des Helmholtzstranges strömt außerdem durch diesen By-Pass ein hoher Anteil des Gesamtvolumenstromes. Diese Strömungsaufteilung ermöglicht, das gasführende Rohr im Schalldämpfer entsprechend klein und damit als zusätzlich tieffrequent dämpfendes Bauteil auszulegen.By opening the Helmholtz line, a high proportion of the total volume flow also flows through this bypass. This flow distribution makes it possible to design the gas-carrying pipe in the silencer to be correspondingly small and thus to act as an additional low-frequency dampening component.

Fast immer steht bei der Gesamtauslegung einer Schalldämpferanlage nur ein sehr begrenzter Bauraum zur Verfügung.There is almost always only very limited installation space available when designing a silencer system.

Die oben beschriebene Erfindung ermöglicht, durch die quasi doppelte Verwendung des Helmholtzsystems den Bauraum optimal zu nutzen und ist damit speziell bezüglich tieffrequenter Dämpfung und Gegendruckverhalten den konventionellen Schalldämpferanlagen, den heutigen Helmholtzsystemen und den schaltbaren Gesamtsystemen überlegen.The invention described above makes it possible to make optimal use of the installation space through the quasi double use of the Helmholtz system and is therefore superior to conventional silencer systems, today's Helmholtz systems and switchable overall systems, especially with regard to low-frequency damping and backpressure behavior.

Ausfuhrungsbeispiele der Erfindung werden anhand der Figuren 1 und 2 erläutert. Es zeigen:Embodiments of the invention are explained with reference to Figures 1 and 2. They show:

Figur 1 Prinzipdarstellung eines schaltbaren Helmholtz-Systems Figur 2 wie vor, jedoch in ein Schalldämpfervolumen integriertFigure 1 Schematic diagram of a switchable Helmholtz system Figure 2 as above, but integrated into a silencer volume

Bezugszeichenliste:List of reference symbols:

1 Eingangsrohr1 inlet pipe

2 Strömungsfuhrendes Rohr2 Flow-carrying pipe

3 Rohr des Helmholtzresonators3 Tube of the Helmholtz resonator

4 Volumen des Helmholtzresonators4 Volume of the Helmholtz resonator

5 Schaltelement5 Switching element

6 Ausgangsrohr6 Outlet pipe

Pfeil durchgezogen: HauptströmungSolid arrow: main current

Pfeil gestrichelt: By-Pass bei geöffnetem SchaltelementDashed arrow: By-pass with open switching element

Schaltelement durchgezogen: geschlossenSwitch element solid: closed

Schaltelement gestrichelt: geöffnetSwitch element dashed: open

Claims (5)

1. Helmholtzresonator, dadurch gekennzeichnet, daß durch ein Schaltelement das Helmholtzsystem außerhalb seiner Wirkfrequenz geöffnet und durchströmt werden kann. 1. Helmholtz resonator, characterized in that the Helmholtz system can be opened and flowed through outside of its effective frequency by means of a switching element. 2. Helmholtzresonator nach Anspruch 1, dadurch gekennzeichnet, daß bei geöffnetem Helmholtzresonator eine By-Fass-Strömung durch den Helmholtzresonator fließt, so daß die anderen strömungsführenden Bauteile des Gesamtsystems in freien Querschnitt reduziert werden können. 2. Helmholtz resonator according to claim 1, characterized in that when the Helmholtz resonator is open, a by-pass flow flows through the Helmholtz resonator, so that the other flow-conducting components of the overall system can be reduced in free cross-section. 3. Helmholtzresonator nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das Schaltelement systemgesteuert ist (z. B.: durch Gegendruck). 3. Helmholtz resonator according to claim 1 and 2, characterized in that the switching element is system-controlled (e.g. by counterpressure). 4. Helmholtzresonator nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das Schaltelement fremdgesteuert ist (z. B.: Schaltimpuls). 4. Helmholtz resonator according to claim 1 and 2, characterized in that the switching element is externally controlled (e.g. switching pulse). 5. Helmholtzresonator nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß das Helmholtzvolumen und/oder das Helmholtzrohr zusätzliche Bedämpfung aufweist. 5. Helmholtz resonator according to claims 1 to 4, characterized in that the Helmholtz volume and/or the Helmholtz tube has additional damping.
DE20003519U 2000-02-25 2000-02-25 Helmholtz resonator Expired - Lifetime DE20003519U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE20003519U DE20003519U1 (en) 2000-02-25 2000-02-25 Helmholtz resonator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE20003519U DE20003519U1 (en) 2000-02-25 2000-02-25 Helmholtz resonator

Publications (1)

Publication Number Publication Date
DE20003519U1 true DE20003519U1 (en) 2000-06-08

Family

ID=7937937

Family Applications (1)

Application Number Title Priority Date Filing Date
DE20003519U Expired - Lifetime DE20003519U1 (en) 2000-02-25 2000-02-25 Helmholtz resonator

Country Status (1)

Country Link
DE (1) DE20003519U1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10232291A1 (en) * 2002-07-16 2004-02-05 Eads Deutschland Gmbh Active noise abatement appliance has housing containing chamber with opening in one wall to the side of gas flow, with deflector
EP1460243A1 (en) * 2003-03-20 2004-09-22 Peugeot Citroen Automobiles S.A. Acoustic silencing system
EP1760279A3 (en) * 2005-09-01 2009-03-11 J. Eberspächer GmbH & Co. KG Silencer for an exhaust system
DE102018004486A1 (en) 2018-06-03 2019-12-05 Gesellschaft für Akustikforschung Dresden mbH Device for damping and / or absorbing sound
DE102014114876B4 (en) 2013-10-15 2023-07-20 Hyundai Motor Company Structure of exhaust system for cylinder deactivation internal combustion engine
DE102014114190B4 (en) 2013-10-15 2023-08-17 Hyundai Motor Company Exhaust system structure for cylinder deactivation (CDA) internal combustion engine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10232291A1 (en) * 2002-07-16 2004-02-05 Eads Deutschland Gmbh Active noise abatement appliance has housing containing chamber with opening in one wall to the side of gas flow, with deflector
DE10232291B4 (en) * 2002-07-16 2004-05-27 Eads Deutschland Gmbh Device and method for active noise control and engine for aircraft
US7273130B2 (en) 2002-07-16 2007-09-25 Eads Deutschland Gmbh Device and method for active soundproofing, and power unit for aeroplanes
EP1460243A1 (en) * 2003-03-20 2004-09-22 Peugeot Citroen Automobiles S.A. Acoustic silencing system
FR2852625A1 (en) * 2003-03-20 2004-09-24 Peugeot Citroen Automobiles Sa ACOUSTIC MITIGATION SYSTEM
EP1760279A3 (en) * 2005-09-01 2009-03-11 J. Eberspächer GmbH & Co. KG Silencer for an exhaust system
DE102014114876B4 (en) 2013-10-15 2023-07-20 Hyundai Motor Company Structure of exhaust system for cylinder deactivation internal combustion engine
DE102014114190B4 (en) 2013-10-15 2023-08-17 Hyundai Motor Company Exhaust system structure for cylinder deactivation (CDA) internal combustion engine
DE102018004486A1 (en) 2018-06-03 2019-12-05 Gesellschaft für Akustikforschung Dresden mbH Device for damping and / or absorbing sound

Similar Documents

Publication Publication Date Title
EP1760279B1 (en) Silencer for an exhaust system
EP3311009B1 (en) Exhaust system
DE69832764T2 (en) silencer
DE2822777A1 (en) SILENCER FOR COMBUSTION MACHINERY
EP3215724B1 (en) Exhaust gas after-treatment apparatus and method for exhaust gas after-treatment
DE69917072T2 (en) PERFORATED END PIECE OF A SILENCER
DE112006003265T5 (en) Muffler unit with sound-absorbing element
DE20003519U1 (en) Helmholtz resonator
DE102007026811A1 (en) silencer
DE2545364A1 (en) COMBUSTION ENGINE EXHAUST SILENCER
DE19743446A1 (en) Exhaust silencing system for internal combustion engine
EP2646676B1 (en) Fluid pulsation damper
DE9406200U1 (en) Bimodal silencer system
DE102015102611A1 (en) Exhaust gas routing system for an internal combustion engine
EP1381025A2 (en) Sound damping device having a Helmholtz resonator for installations with pulsating gas flows
EP1826369B1 (en) Silencer for an exhaust system
DE102015110199A1 (en) exhaust silencer
DE1426198A1 (en) Silencer
DE19622235C2 (en) Intake device for an internal combustion engine
EP1798390A2 (en) Engine exhaust apparatus
DE3011294A1 (en) IC engine air intake system - has cleaning and expansion chambers separated by diaphragm to suppress pulsations in intake air flow
EP3244130B1 (en) Exhaust silencer for an exhaust gas conduit, in particular for an exhaust gas conduit exiting from an oil fired boiler
DE102018123536A1 (en) Method and device for enabling a reduction in space in a vehicle exhaust system
DE102005004674B4 (en) Device for silencing pulsating gas flows
DE2318814A1 (en) SOUND ATTENUATION DEVICE

Legal Events

Date Code Title Description
R086 Non-binding declaration of licensing interest
R207 Utility model specification

Effective date: 20000713

R156 Lapse of ip right after 3 years

Effective date: 20030829