EP0704617A1 - Schallabsorber - Google Patents

Schallabsorber Download PDF

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Publication number
EP0704617A1
EP0704617A1 EP95202130A EP95202130A EP0704617A1 EP 0704617 A1 EP0704617 A1 EP 0704617A1 EP 95202130 A EP95202130 A EP 95202130A EP 95202130 A EP95202130 A EP 95202130A EP 0704617 A1 EP0704617 A1 EP 0704617A1
Authority
EP
European Patent Office
Prior art keywords
tuner
acoustical
duct
sound
frequency
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.)
Withdrawn
Application number
EP95202130A
Other languages
English (en)
French (fr)
Inventor
Donald Robert Demorest
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of EP0704617A1 publication Critical patent/EP0704617A1/de
Withdrawn legal-status Critical Current

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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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/22—Silencing apparatus characterised by method of silencing by using movable parts the parts being resilient walls
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
    • 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
    • F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes

Definitions

  • the invention relates to passive cancellation of noise generated in a gas carrying duct and, in particular, to an air induction system of an internal combustion engine having a modified acoustical tuner.
  • the air induction system of an automotive internal combustion engine can be a source of undesirable noise.
  • Passive noise cancellation techniques have employed resonators or tuners which are connected to the intake system and are operable to attenuate specific frequencies.
  • An example of such a tuner is a quarter-wave tuner which is typically a tube having a length which is roughly equal to one-fourth of the wave length of the sound energy to be attenuated.
  • Generation by the induction system of the tuners natural frequency will result in a reflected waveform of the same frequency and amplitude but of opposite phase.
  • the tuner generated waveform cancels the induction noise at that frequency.
  • the tuners are typically constructed of a tube having an open end in communication with the induction system and a closed end.
  • a tuner may comprise a cylindrical body with both ends closed and an opening midway between the two ends which communicates with the induction system.
  • Maximum sound pressure points are created along the length of the intake system with the locations of the points dependent upon the length and configuration of the specific intake.
  • the opening to the tuner communicates with the intake at the pressure point for the frequency to be attenuated and can, as a result, significantly attenuate the generated noise at that frequency.
  • the tuning in noise generated in the narrow band addressed by such tuners may come undesirable side frequency peaks on either side of the absorbed frequency peak. Although reduced significantly from the attenuated frequency peak, these side frequency peaks can be the source of additional generated noise.
  • the present invention is directed to an acoustical tuner for use in the attenuation of noise generated from a gas carrying duct such as is commonly used in the intake systems of internal combustion engines.
  • the tuner of the present invention may be constructed as a tube having a length corresponding to the wavelength of the sound energy to be attenuated.
  • the tube is placed in communication with the gas carrying duct at a location along the duct at which a high pressure point for the wavelength of the sound to be attenuated exists.
  • Such a location has to be determined for each configuration of gas carrying duct, as the location of the points will depend on the specific configuration.
  • the acoustical tuner may also include a second, closed end which is constructed of a moveable diaphragm.
  • a sound wave entering the tuner from the gas carrying intake duct will be reflected from the closed end and returned to the open end in phase-opposition to the duct carried sound wave of the same frequency.
  • the movable diaphragm moves outwardly as the sound wave impacts the closed second end. The outward movement, and subsequent return of the diaphragm to its original location, converts acoustical energy to mechanical energy while changing the effective tuned length of the tuner.
  • the resultant frequency attenuation of the disclosed tuner is operable over a larger frequency range and, more specifically, over a portion of the range of undesirable side frequency peaks which may be generated when using an acoustical tuner having ends of conventional design.
  • the quarter-wave tuner 12 shown in figure 1, includes a tubular body 14 which extends radially outwardly from the inlet duct 10 and is terminated at a closed, second end 18.
  • the total length of the tuner 12 approximates one quarter the wave length of the frequency producing the sound pressure point to be attenuated.
  • a sound wave enters the first end 16 of tuner 12 it traverses the length of the tube 14 and is reflected by the closed second end 18 of the tuner as a waveform with the same frequency and amplitude but opposite in phase so as to cancel the induction noise at that frequency.
  • the side frequency peaks of curve "B" which are generated using the quarter-wave tuner are further attenuated by the application of a movable, diaphragm 20 to the closed, second end 18 of tuner 12.
  • the diaphragm 20 is preferably constructed of an inelastic material such as metal or semi rigid plastic. The diaphragm closes the second end 18 of the tuner 12 in a "limp" fashion as opposed to being drawn taught, across the second end which could radiate additional sound energy in much the same way as a drum.
  • FIG. 2 illustrates a second embodiment of the present invention in which a tuner 12' is constructed of two lengths of tube 22,24 placed in series and coupled by a bend 26 in the tuner.
  • a first diaphragm 28 At the terminus of the first length of tube 22 and integral with the bend 26 in tuner 12' is a first diaphragm 28.
  • a second diaphragm 30 At the terminus of the second length of tube 24 and integral with the second end of tuner 12' is a second diaphragm 30.
  • the tuner 12' of Figure 2 operates on more than one frequency peak in inlet duct 10'.
  • the first length 22 of tuner 12' operable to attenuate frequency peaks associated with its length and, in addition, the first and second lengths 22 and 24, operable to attenuate frequency peaks associated with the cumulative lengths thereof.
  • the diaphragms 28 and 30 extend the effective attenuation of the tuner 12' through the conversion of acoustic energy to mechanical energy as the diaphragms are moved outwardly and, subsequently, returned to position to thereby vary the effective length of the tuner sections.
  • the second diaphragm 30 of the tuner 12' shown in Figure 3 is shown with an additional embodiment of the present invention. It may be desirable to add a mass 32 to the surface of the flexible diaphragm. Such a mass can add to the energy dissipating effect of the diaphragm which may be desirable in further attenuating noise frequencies in the duct 10'.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP95202130A 1994-09-02 1995-08-03 Schallabsorber Withdrawn EP0704617A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US299979 1981-09-08
US29997994A 1994-09-02 1994-09-02

Publications (1)

Publication Number Publication Date
EP0704617A1 true EP0704617A1 (de) 1996-04-03

Family

ID=23157143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95202130A Withdrawn EP0704617A1 (de) 1994-09-02 1995-08-03 Schallabsorber

Country Status (3)

Country Link
EP (1) EP0704617A1 (de)
JP (1) JPH0874690A (de)
CA (1) CA2153855A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7111601B2 (en) * 2004-03-18 2006-09-26 Visteon Global Technologies, Inc. Air induction system having an environmentally resistant acoustic membrane
EP1808594A1 (de) * 2006-01-13 2007-07-18 Denso Corporation Einlassdämpfer
EP1865187A3 (de) * 2006-06-05 2008-12-24 Nissan Motor Company Limited Verbesserungen bei oder im Zusammenhang mit Fahrzeuggeräuschen
US7717230B2 (en) 2006-06-05 2010-05-18 Nissan Motor Co., Ltd. Device and method for amplifying suction noise
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
WO2024011964A1 (zh) * 2022-07-12 2024-01-18 合肥美的电冰箱有限公司 消音器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003097371A (ja) * 2001-09-26 2003-04-03 Toyota Motor Corp 内燃機関の吸気装置
JP3901483B2 (ja) 2001-10-04 2007-04-04 ヤマハ発動機株式会社 エンジンの吸気音調整構造及び排気音調整構造

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1954516A (en) * 1931-10-19 1934-04-10 Maxim Silencer Co Sound attenuating device
JPS5332222A (en) * 1976-09-06 1978-03-27 Kawasaki Heavy Ind Ltd Intake air nozzle silencer for internal combustion engine
JPS58124057A (ja) * 1982-01-19 1983-07-23 Toyota Motor Corp 吸気レゾネ−タ
DE8607920U1 (de) * 1985-04-02 1986-07-31 Fiat Auto S.P.A., Turin/Torino Absorptionsdämpfer der Pulsationen für den Ansaugkrümmer eines Verbrennungsmotors
JPS61190158A (ja) * 1985-02-18 1986-08-23 Honda Motor Co Ltd 内燃機関用吸気系消音装置
EP0376299A1 (de) * 1988-12-28 1990-07-04 Mazda Motor Corporation Ansaugvorrichtung für Kraftmaschine
US5103931A (en) * 1987-07-20 1992-04-14 Sanshin Industries Co., Ltd. Exhaust silencing means for marine propulsion
JPH04246221A (ja) * 1991-01-31 1992-09-02 Toyoda Gosei Co Ltd 消音装置
GB2260574A (en) * 1991-10-16 1993-04-21 Hyundai Motor Co Ltd Engine intake silencer with variable resonator capacity
US5333576A (en) * 1993-03-31 1994-08-02 Ford Motor Company Noise attenuation device for air induction system for internal combustion engine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1954516A (en) * 1931-10-19 1934-04-10 Maxim Silencer Co Sound attenuating device
JPS5332222A (en) * 1976-09-06 1978-03-27 Kawasaki Heavy Ind Ltd Intake air nozzle silencer for internal combustion engine
JPS58124057A (ja) * 1982-01-19 1983-07-23 Toyota Motor Corp 吸気レゾネ−タ
JPS61190158A (ja) * 1985-02-18 1986-08-23 Honda Motor Co Ltd 内燃機関用吸気系消音装置
DE8607920U1 (de) * 1985-04-02 1986-07-31 Fiat Auto S.P.A., Turin/Torino Absorptionsdämpfer der Pulsationen für den Ansaugkrümmer eines Verbrennungsmotors
US5103931A (en) * 1987-07-20 1992-04-14 Sanshin Industries Co., Ltd. Exhaust silencing means for marine propulsion
EP0376299A1 (de) * 1988-12-28 1990-07-04 Mazda Motor Corporation Ansaugvorrichtung für Kraftmaschine
JPH04246221A (ja) * 1991-01-31 1992-09-02 Toyoda Gosei Co Ltd 消音装置
GB2260574A (en) * 1991-10-16 1993-04-21 Hyundai Motor Co Ltd Engine intake silencer with variable resonator capacity
US5333576A (en) * 1993-03-31 1994-08-02 Ford Motor Company Noise attenuation device for air induction system for internal combustion engine

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 14 (M - 553)<2461> 14 January 1987 (1987-01-14) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 21 (M - 1353) 14 January 1993 (1993-01-14) *
PATENT ABSTRACTS OF JAPAN vol. 2, no. 69 (M - 021) 25 May 1978 (1978-05-25) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 230 (M - 249)<1375> 12 October 1983 (1983-10-12) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7111601B2 (en) * 2004-03-18 2006-09-26 Visteon Global Technologies, Inc. Air induction system having an environmentally resistant acoustic membrane
EP1808594A1 (de) * 2006-01-13 2007-07-18 Denso Corporation Einlassdämpfer
US7350496B2 (en) 2006-01-13 2008-04-01 Denso Corporation Intake muffler
EP1865187A3 (de) * 2006-06-05 2008-12-24 Nissan Motor Company Limited Verbesserungen bei oder im Zusammenhang mit Fahrzeuggeräuschen
US7717230B2 (en) 2006-06-05 2010-05-18 Nissan Motor Co., Ltd. Device and method for amplifying suction noise
USRE42490E1 (en) 2006-06-05 2011-06-28 Nissan Motor Co., Ltd. Device and method for amplifying suction noise
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
US8844671B2 (en) 2012-05-16 2014-09-30 Leica Microsystems Cms Gmbh Apparatus for damping sound in the optical beam path of a microscope, and microscope having a corresponding apparatus
WO2024011964A1 (zh) * 2022-07-12 2024-01-18 合肥美的电冰箱有限公司 消音器

Also Published As

Publication number Publication date
JPH0874690A (ja) 1996-03-19
CA2153855A1 (en) 1996-03-03

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