EP2130201B1 - Résonateur de helmholtz - Google Patents

Résonateur de helmholtz Download PDF

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Publication number
EP2130201B1
EP2130201B1 EP08735476.7A EP08735476A EP2130201B1 EP 2130201 B1 EP2130201 B1 EP 2130201B1 EP 08735476 A EP08735476 A EP 08735476A EP 2130201 B1 EP2130201 B1 EP 2130201B1
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EP
European Patent Office
Prior art keywords
helmholtz resonator
membrane
housing
specified
resonance
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.)
Not-in-force
Application number
EP08735476.7A
Other languages
German (de)
English (en)
Other versions
EP2130201A1 (fr
Inventor
David Shawn Marion
Stephen Francis Bloomer
Jianrui Ye
Richard Donald Mcwilliam
Philip Edward Arthur Stuart
Jason Lorne Pettipiece
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2130201A1 publication Critical patent/EP2130201A1/fr
Application granted granted Critical
Publication of EP2130201B1 publication Critical patent/EP2130201B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance

Definitions

  • the present invention relates to a Helmholtz resonator for damping airborne sound in a room, in particular in an airborne sounding conduit.
  • the invention also relates to a gas-conducting system for an internal combustion engine, in particular of a motor vehicle, as well as a silencer for such a gas-conducting system, which are each equipped with such a Helmholtz resonator.
  • a Helmholtz resonator is well known in the acoustics and serves to dampen airborne sound.
  • Helmholtz resonators are used in fresh air systems and exhaust systems of internal combustion engines, in particular in motor vehicles, in order to selectively dampen certain interfering frequencies.
  • a Helmholtz resonator has a resonant volume which is enclosed in a housing and which communicates via a neck with the space in which the sound to be damped propagates.
  • the Helmholtz resonator acts like a spring-mass oscillator whose spring is formed by the resonance volume and whose mass is formed by the air mass oscillating in the neck.
  • Such Helmholtz resonators can be calculated comparatively accurately and interpreted accordingly relatively accurately.
  • the present invention is concerned with the problem for a Helmholtz resonator of the type mentioned or for a so equipped Gas management system or a so equipped muffler to provide an improved embodiment, which is characterized in particular by the fact that with a relatively low cost at least two different resonant frequencies can be realized.
  • the invention is based on the general idea of equipping the housing of the Helmholtz resonator with at least one oscillatable membrane which is designed such that its first order resonant frequency essentially corresponds to that resonant frequency that a structurally identical Helmholtz resonator would have without such a membrane.
  • This construction has the consequence that the membrane is excited to vibrate in the region of its resonant frequency, which slightly attenuates the damping effect of the Helmholtz resonator in the region of the resonant frequency compared to a structurally identical Helmholtz resonator without such a membrane, but in a first frequency range adjacent thereto , which lies below the resonant frequency of the membrane, as well as in a second frequency range adjacent thereto, which is above the resonant frequency of the membrane, each showing a maximum of the damping effect, in these two frequency ranges compared to a structurally identical Helmholtz resonator without such a significant membrane show increased damping effect.
  • the Helmholtz resonator constructed according to the invention thus has two different frequencies with maximum damping effect on both sides of the resonant frequency of the diaphragm. These two frequencies thus form two resonance frequencies of the Helmholtz resonator according to the invention. They can be predicted comparatively accurately.
  • the proposed Helmholtz resonator receives a certain broadband effect, namely between its resonance frequencies.
  • the Helmholtz resonator thus formed can be effectively used in particular also in varying environmental conditions.
  • the housing may have at least one cover which encloses the wall section having the membrane in an additional volume, in particular gas-tight, at an outer side of the housing facing away from the resonance volume.
  • the damping effect of the membrane to a certain extent of environmental conditions, such. For example, pressure and temperature, the Helmholtz resonator are decoupled.
  • the damping effect of the Helmholtz resonator in the region of the two resonance frequencies can be ensured.
  • Corresponding Fig. 1 can be connected to a conventional internal combustion engine 1 on the input side, a gas supply system 2 for supplying fresh air, so-called fresh air system 2 and the output side, a gas supply system 3 for carrying away exhaust gas, so-called exhaust system 3.
  • the respective gas-conducting installation 2, 3 has in each case at least one gas-carrying line 4 or 5, wherein a Helmholtz resonator 6 or a silencer 7 can be connected to at least one of these lines 4, 5 and contains at least one such Helmholtz resonator 6 ,
  • both the fresh air system 2 is equipped with such a silencer 7 or such a Helmholtz resonator 6 and the exhaust system 3.
  • such a Helmholtz resonator 6 comprises in each case a housing 8 which encloses a resonance volume 9, in particular gas-tight, and at least one neck 10 which connects the resonance volume 9 with a space, in this case with a line, namely with the fresh air line 4 or with the exhaust line 5, which conveys airborne sound.
  • the Helmholtz resonator 6 serves to dampen the transported in the respective line 4, 5 airborne sound. It is important for the here in shunt arranged Helmholtz resonator 6 that its housing 8 closes the resonance volume 9 outside the respective neck 10 gas-tight to the outside.
  • the respective housing 8 has at least one oscillatable membrane 11 which forms a wall section of the housing 8 delimiting the resonance volume 9.
  • this membrane 11 is designed so that the first order of this resonant frequency corresponds to that resonant frequency of a structurally identical Helmholtz resonator which has no such membrane 11.
  • Fig. 6 The effect of such a membrane 11 with the tuning according to the invention is with reference to Fig. 6 explained in more detail.
  • the acoustic attenuation is plotted in decibels dB, while on the abscissa the acoustic frequency is plotted in Hertz Hz.
  • a dashed line is a damping curve 13 of a structurally identical Helmholtz resonator, which has no such membrane 11, applied. Visible this course 13 has a maximum 14 at a resonant frequency 15 of this membraneless, but otherwise identical Helmholtz resonator.
  • This resonant frequency 15 of the membraneless Helmholtz resonator corresponds to the first order of the resonant frequency of the diaphragm 11. Furthermore, the diagram of the Fig. 6 a curve 16, the dependence of the attenuation of the frequency in the Helmholtz resonator 6 according to the invention with a such membrane 11 reproduces. As can be seen, the damping effect initially increases up to a first maximum 17, as a result of which the Helmholtz resonator 6 according to the invention has a first resonance frequency 18.
  • the damping effect drops to a minimum 19, which lies in the region of the resonance frequency 15 of the structurally identical but diaphragmless Helmholtz resonator, ie in the region of the resonance frequency of the diaphragm 11. Afterwards, the damping effect increases again up to a second maximum 20, at which the Helmholtz resonator 6 according to the invention has a second resonance frequency 21.
  • Recognizable thus causes the specially designed membrane 11, that in contrast to a conventional membraneless Helmholtz resonator instead of a single resonant frequency 15, two resonant frequencies 18, 21 are present whose Dampfungsmaxima 17, 20 arranged approximately mirror symmetry to the resonant frequency 15 of the conventional membraneless Helmholtz resonator are.
  • the respective membrane 11 can in particular be produced integrally with the remaining housing 8, for example by injection molding of plastic.
  • the membrane 11 differs from the rest of the housing 8 in particular by its thickness, which can be considerably reduced compared to the thickness of the remaining housing 8.
  • the membrane 11 is designed so that it can vibrate, at least in the region of its connection to the surrounding housing 8, so that it can flex elastically in order to perform the desired oscillatory movements 12.
  • the rest of the housing 8 outside the membrane 11 is designed comparatively stiff.
  • the housing 8 outside of the respective membrane 11 is designed so stiff that any resonant frequency of the housing 8 outside of the respective membrane 11 is at least ten times greater than the resonance frequency 15 of the identical, membraneless Helmholtz resonator with respect to their first order , In other words, if the housing 8 itself has a resonance frequency, its first order is at least ten times greater than the resonance frequencies 18, 21 of the Helmholtz resonator 6.
  • the membrane 11 may be designed in a suitable manner, so that they from the rest of the housing 8 in particular by the selected material, by the selected Thickness and if necessary by a profile as well as by their form differs.
  • the respective housing 8 for the respective membrane 11 has a housing opening 22 which is closed by the respective membrane 11.
  • the housing 8 has at least one cover 23. This is arranged on a side facing away from the resonant volume 9 outside of the housing 8, in such a way that it covers the membrane 11 forming or containing wall portion and in an additional volume 24, preferably gas-tight includes.
  • the lid 23 is preferably made less stiff than the housing 8 outside the membrane 11. Basically, an embodiment is possible in which the lid 23 is designed to be the same stiff as the housing 8 outside the membrane 11. Thus, the lid 23 may in particular be made of the same material as the rest of the housing. 8
  • two membranes 11 and 11 ' are shown purely by way of example. In principle, more than two membranes 11, 11 'can be provided.
  • the two membranes 11, 11 'can be designed identically. Likewise, they can be tuned to the same resonant frequency with different design. Likewise, an embodiment is possible in which the two membranes 11, 11 'are tuned to different resonance frequencies. As a result, the attenuation maxima 17, 20 can be made wider.
  • the housing 8 is also provided with two diaphragms 11 and 11 ', respectively, similar to the embodiment according to FIG Fig. 4 , Preferably, the two membranes 11, 11 'in the in Fig. 5 shown differently matched.
  • Each of these membranes 11, 11 ' is tuned to a different resonant frequency of a structurally identical Helmholtz resonator with the two different necks 10, 10' but without the membranes 11, 11 '. This ensures that the in Fig. 6 shown relationship for both "imaginary" resonant frequencies of the identical, membraneless Helmholtz resonator results. Accordingly, there are then a total of four resonance frequencies for the Helmholtz resonator 6 according to the invention with two different necks 10, 10 '.

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)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)

Claims (10)

  1. Résonateur de Helmholtz destiné à amortir le bruit aérien dans un espace, en particulier dans une conduite (4, 5) transportant du bruit aérien, comprenant
    - un boîtier (8) qui entoure un volume de résonance (9),
    - au moins un col (10) de raccordement du volume de résonance (9) audit espace (4, 5),
    - ledit boîtier (8) présentant au moins une section de paroi qui limite le volume de résonance (9) et qui est constituée par une membrane (11) apte à vibrer, caractérisé par le fait

    que ladite membrane (11) est accordée de manière à ce que sa fréquence de résonance de premier ordre corresponde à la fréquence de résonance d'un résonateur de Helmholtz de construction identique qui ne possède pas une telle membrane (11).
  2. Résonateur de Helmholtz selon la revendication 1, caractérisé par le fait
    que ledit boîtier (8) comprend au moins un couvercle (23) qui, sur une face extérieure du boîtier (8) qui montre dans la direction opposée au volume de résonance (9), renferme, dans un volume supplémentaire (24), la section de paroi présentant ou bien formant ladite membrane (11).
  3. Résonateur de Helmholtz selon la revendication 2, caractérisé par le fait
    que ledit couvercle (23) est réalisé de manière à être plus rigide que ladite membrane (11).
  4. Résonateur de Helmholtz selon la revendication 2 ou 3, caractérisé par le fait
    que ledit couvercle (23) est réalisé de manière à présenter une rigidité inférieure ou égale à celle du boîtier (8) à l'extérieur de la membrane (11).
  5. Résonateur de Helmholtz selon l'une quelconque des revendications 1 à 4, caractérisé par le fait
    que ladite membrane (11) se distingue du boîtier (8) restant par la matière et/ou l'épaisseur et/ou le profil et/ou la forme.
  6. Résonateur de Helmholtz selon l'une quelconque des revendications 1 à 5, caractérisé par le fait
    que ledit boîtier (8) à l'extérieur de ladite membrane (11) est réalisé de manière à être relativement rigide.
  7. Résonateur de Helmholtz selon la revendication 6, caractérisé par le fait
    que ledit boîtier (8) à l'extérieur de la membrane (11) est réalisé de manière à présenter une rigidité telle que sa fréquence de résonance de premier ordre est au moins dix fois plus importante que la fréquence de résonance du résonateur de Helmholtz de construction identique et dépourvu d'une telle membrane (11).
  8. Résonateur de Helmholtz selon l'une quelconque des revendications 1 à 7, caractérisé par le fait
    - que le résonateur de Helmholtz (6) présente au moins deux cols (10, 10') qui se distinguent l'un de l'autre par leur section transversale et/ou par leur longueur, de telle manière que le résonateur de Helmholtz dépourvu de membrane possède au moins deux fréquences de résonance,
    - que ledit boîtier (8) présente au moins deux membranes (11, 11') qui sont accordées chacune sur l'une des fréquences de résonance différentes du résonateur de Helmholtz dépourvu de membrane.
  9. Installation de conduite de gaz pour un moteur à combustion interne (1), en particulier d'un véhicule automobile, pour amener de l'air frais ou pour évacuer du gaz d'échappement, comprenant au moins une conduite de gaz (4, 5) à laquelle est raccordé au moins un résonateur de Helmholtz (6) selon l'une quelconque des revendications 1 à 8.
  10. Silencieux pour une installation de conduite de gaz (2, 3), d'un moteur à combustion interne (1), en particulier d'un véhicule automobile, dans lequel ladite installation de conduite de gaz (2) sert à amener de l'air frais ou à évacuer du gaz d'échappement, comprenant au moins une conduite de gaz (4, 5) à laquelle est raccordé au moins un résonateur de Helmholtz (6) selon l'une quelconque des revendications 1 à 8.
EP08735476.7A 2007-03-28 2008-03-26 Résonateur de helmholtz Not-in-force EP2130201B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90855707P 2007-03-28 2007-03-28
PCT/EP2008/053523 WO2008116870A1 (fr) 2007-03-28 2008-03-26 Résonateur de helmholtz

Publications (2)

Publication Number Publication Date
EP2130201A1 EP2130201A1 (fr) 2009-12-09
EP2130201B1 true EP2130201B1 (fr) 2014-05-07

Family

ID=39628923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08735476.7A Not-in-force EP2130201B1 (fr) 2007-03-28 2008-03-26 Résonateur de helmholtz

Country Status (3)

Country Link
US (1) US20100212999A1 (fr)
EP (1) EP2130201B1 (fr)
WO (1) WO2008116870A1 (fr)

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DE102012208250A1 (de) * 2012-05-16 2013-11-21 Leica Microsystems Cms Gmbh Vorrichtung zur Dämmung von Schall im optischen Strahlengang eines Mikroskops und Mikroskop mit einer entsprechenden Vorrichtung
CN103075605B (zh) * 2013-01-10 2015-04-29 重庆大学 双腔共振式消声器
JP2014173962A (ja) * 2013-03-08 2014-09-22 Mitsubishi Heavy Ind Ltd 導圧管の共鳴低減装置
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KR102378054B1 (ko) * 2017-08-25 2022-03-25 현대자동차주식회사 차량의 배기음 발생장치
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WO2020080112A1 (fr) * 2018-10-19 2020-04-23 富士フイルム株式会社 Système acoustique
DE102018219729A1 (de) * 2018-11-16 2020-05-20 Robert Bosch Gmbh Vorrichtung zur Bestimmung wenigstens eines Parameters eines in einem Strömungsrohr strömenden fluiden Mediums
CN109801615A (zh) * 2018-12-12 2019-05-24 东南大学 一种柔性亥姆霍兹声调控结构
US11322126B2 (en) * 2018-12-20 2022-05-03 Toyota Motor Engineering & Manufacturing North America, Inc. Broadband sparse acoustic absorber
JP7131396B2 (ja) * 2019-01-08 2022-09-06 トヨタ自動車株式会社 トランスミッションの防音装置

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Also Published As

Publication number Publication date
WO2008116870A1 (fr) 2008-10-02
US20100212999A1 (en) 2010-08-26
EP2130201A1 (fr) 2009-12-09

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