EP0586831B1 - Schallabsorptionsverfahren für Kraftfahrzeuge - Google Patents

Schallabsorptionsverfahren für Kraftfahrzeuge Download PDF

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Publication number
EP0586831B1
EP0586831B1 EP93111202A EP93111202A EP0586831B1 EP 0586831 B1 EP0586831 B1 EP 0586831B1 EP 93111202 A EP93111202 A EP 93111202A EP 93111202 A EP93111202 A EP 93111202A EP 0586831 B1 EP0586831 B1 EP 0586831B1
Authority
EP
European Patent Office
Prior art keywords
hollow body
helmholtz resonator
loudspeaker
noise
helmholtz
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
EP93111202A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0586831A2 (de
EP0586831A3 (enrdf_load_stackoverflow
Inventor
Raymond Dr. Freymann
Helmut Spannheimer
Rainer Beer
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0586831A2 publication Critical patent/EP0586831A2/de
Publication of EP0586831A3 publication Critical patent/EP0586831A3/xx
Application granted granted Critical
Publication of EP0586831B1 publication Critical patent/EP0586831B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3227—Resonators
    • G10K2210/32272—Helmholtz resonators

Definitions

  • the invention relates to a sound absorption method for motor vehicles according to the preamble of the claim 1.
  • DE 37 29 765 A1 describes a sound absorption process known in which several Helmholtz resonators, especially for low-frequency attenuation Cavity vibrations, connected in parallel and space-saving are housed in the vehicle body. At damping of sound pressure vibrations by Helmholtz resonators are in with lower frequencies usually larger hollow body volumes of the Helmholtz resonators required. That known from DE 37 29 765 A1 Sound absorption system tries the problem of large hollow body volumes only by the type of To solve accommodation in the motor vehicle.
  • the hollow body volume of a Helmholtz resonator works in the form of the prevailing sound pressure behavior on sound absorption.
  • the invention lies the thought is based in a relatively small Hollow body of a Helmholtz resonator has a sound pressure behavior to generate that the sound pressure behavior of the usual each necessary volume for the desired resonance frequency of the Helmholtz resonator, where the sound pressure is at least predominantly Dimensions is absorbed corresponds.
  • a loudspeaker attached through which the hollow body is exposed to sound is that the volume of hollow body required for the desired resonance frequency in the hollow body is faked. Only a single hollow body volume can be used as well as sequentially or simulates several hollow body volumes simultaneously will. The simulation is particularly advantageous many hollow body volumes that a broadband resonance behavior in the form of an acoustic bandpass filter is produced.
  • this invention provides sound absorption through Helmholtz resonators with a relative small volume possible.
  • Helmholtz resonator both consecutively in time as well as being tuned to several resonance frequencies at the same time will.
  • the following is the invention with a loudspeaker sounded Helmholtz resonator also as active Helmholtz resonator, while conventional Helmholtz resonators with specified real volumes passive Helmholtz resonators are also called.
  • the loudspeaker is controlled by a Transmission system that takes place between those in the area prevailing sound pressure recording microphone and the one in the active Helmholtz resonator Speaker is arranged.
  • the transmission system is designed such that the sound absorption system consisting of the microphone, the transmission system and the same transmission behavior to the active Helmholtz resonator has like a passive Helmholtz resonator that required for the desired resonance frequency real volume.
  • the transmission system is, for example, by the structure an electrical switching arrangement with digital or analogous means realizable on the desired acoustic transmission behavior through electrical analogies is tunable.
  • This passive comparison Helmholtz resonator is also matched to the absorption of the sound pressure at the desired resonance frequency.
  • Such an electro-acoustic device is easier to set up and adapts to interference in the form of superimposed external pressure fluctuations better than an electrical switching arrangement based on an electrical analogy to an idealized acoustic arrangement.
  • Fig. 1 On the left in Fig. 1 is the section in side view consisting of a conventional Helmholtz resonator of a hollow body with the volume V and an air passage opening with a neck of length 1 and Diameter d shown. On the right side of the Fig. 1 is the top view of the Helmholtz resonator with the air passage opening of the cross-sectional area a is shown.
  • f C. 2 ⁇ * ( a l * V ) 1 ⁇ 2 with the speed of sound c, with the neck length l and the cross-sectional area a of the air passage opening and with the volume V of the hollow body.
  • the dependence of the resonance frequency f solely on the volume V will be discussed below.
  • the length l and the cross-sectional area a of the air passage opening are constant.
  • the volume V must increase as the frequencies f decrease. This connection creates the problem of the large space requirement when using a Helmholtz resonator in motor vehicles, since in particular the sound pressure at low frequencies must be absorbed there.
  • FIG. 2 presents two possible embodiments for an active Helmholtz resonator AHR1 and AHR2, the real volumes of which are each determined by the hollow body H.
  • the air passage openings D are also firmly defined.
  • the wall of the hollow body H opposite the air passage opening D is replaced by a loudspeaker L.
  • the sound pressure values in the hollow body H are changed by the loudspeaker L, so that other imaginary volumes in the hollow body H are simulated than the volume that is actually present.
  • the loudspeaker L fulfills the same function inside the hollow body H of the active Helmholtz resonator AHR2 is arranged. With this arrangement option the loudspeaker L is not part of a hollow body wall, but is at least almost complete in the hollow body H. sealed to the environment. Such an arrangement is needed, for example, when special measures against unwanted interference caused by overlapping Pressure fluctuations from outside the hollow body H should be taken.
  • a microphone M is outside the active Helmholtz resonator AHR via an input line with a Transmission system Ü connected.
  • the transmission system Ü is via an output line on the loudspeaker L of the active Helmholtz resonators AHR connected.
  • the microphone M picks up the sound pressure values p a prevailing outside the hollow body H and converts them into a corresponding electrical signal which is passed on to the transmission system Ü.
  • the transmission system Ü is an electronic switching arrangement with PD 2 T 2 transmission behavior.
  • the loudspeaker L is driven by the electrical current I from the transmission system Ü.
  • the transmission system U shown in FIG. 3 can be used for any number of resonance frequencies. In a further embodiment of the invention, it can accordingly also be used simultaneously for a large number of different desired resonance frequencies, the sound pressures of which are to be absorbed. For example, for a number n of desired resonance frequencies, the transmission system can be represented mathematically as follows:
  • FIG. 4 shows an active Helmholtz resonator AHR and a passive comparative Helmholtz resonator PHR.
  • a microphone M 1 outside the two Helmholtz resonators and a microphone M 2 inside the passive comparison Helmholtz resonator PHR are connected to a computing unit R via input lines.
  • An output line of the computing unit R is connected to the loudspeaker L of the active Helmholtz resonator AHR.
  • the passive comparative Helmholtz resonator PHR should be designed in miniature design at the same resonance frequency or for absorption of the sound pressure of the same frequency that is also to be absorbed by the active Helmholtz resonator AHR.
  • the passive comparative Helmholtz resonator PHR has the same transmission behavior, which is also the basis for a passive Helmholtz resonator with the real hollow body volume, which corresponds to the hollow body volume required to be simulated for the sound pressure to be absorbed at the desired resonance frequency.
  • the microphone M 1 records the sound pressure values outside the two Helmholtz resonators AHR and PHR in the vicinity of their air passage openings D1 and D2.
  • the microphone M 2 detects the sound pressure values within the passive Helmholtz resonator PHR.
  • the signals from the microphones M 1 and M 2 are fed to the computing unit R.
  • the only difference between the two Helmholtz resonators AHR and PHR is that due to the differences in the volume of the hollow body, the active Helmholtz resonator AHR absorbs a sound energy many times greater than the passive comparison Helmholtz resonator PHR with the same frequency and damping. This absorption amplification takes place in the computing unit R and has an effect on the active Helmholtz resonator AHR by activating the loudspeaker L via the output line of the computing unit R.
  • FIG. 1 The embodiment of the invention according to FIG.
  • the invention can be applied to Helmholtz resonators with hollow bodies of any shape and air passage openings of any shape.
  • an air passage opening in the form of a large-area sieve-like cover of the hollow body has proven to be particularly advantageous.
  • An arrangement of several loudspeakers within the active Helmholtz resonator is also conceivable.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP93111202A 1992-08-13 1993-07-13 Schallabsorptionsverfahren für Kraftfahrzeuge Expired - Lifetime EP0586831B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4226885 1992-08-13
DE4226885A DE4226885C2 (de) 1992-08-13 1992-08-13 Schallabsorptionsverfahren für Kraftfahrzeuge

Publications (3)

Publication Number Publication Date
EP0586831A2 EP0586831A2 (de) 1994-03-16
EP0586831A3 EP0586831A3 (enrdf_load_stackoverflow) 1994-03-30
EP0586831B1 true EP0586831B1 (de) 1998-09-02

Family

ID=6465521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93111202A Expired - Lifetime EP0586831B1 (de) 1992-08-13 1993-07-13 Schallabsorptionsverfahren für Kraftfahrzeuge

Country Status (2)

Country Link
EP (1) EP0586831B1 (enrdf_load_stackoverflow)
DE (2) DE4226885C2 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004016689A1 (de) * 2004-04-05 2005-10-27 Volkswagen Ag Verfahren und Vorrichtung zum Verbessern von Klangeigenschaften in einem Fahrzeug

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4446080B4 (de) * 1994-12-22 2004-03-18 Bayerische Motoren Werke Ag Schallabsorptionssystem für Kraftfahrzeuge
EP0916817B1 (de) 1997-11-18 2006-02-08 Faurecia Abgastechnik GmbH Aktiver Schalldämpfer
DE19861018C2 (de) 1998-12-15 2001-06-13 Fraunhofer Ges Forschung Gesteuerter akustischer Wellenleiter zur Schalldämpfung
DE60006623T2 (de) * 1999-09-16 2004-09-23 Siemens Vdo Automotive Inc., Chatham Aktiver abgestimmter Helmholtz Resonator mit gezwungener Response
GB2387522B (en) * 2002-04-10 2005-09-28 Hobelsberger Max Tunable active sound absorbers
FR2899011B1 (fr) * 2006-03-24 2008-07-18 Eurocopter France Procede et dispositif de traitement du bruit a bord d'un aeronef
WO2013064602A1 (en) 2011-11-04 2013-05-10 Empa Eidgenössische Materialprüfungs- Und Forschungsanstalt Adaptive helmholtz resonator
WO2019007700A1 (de) 2017-07-07 2019-01-10 Tenneco Gmbh Rauschunterdrückungssystem
DE102017115271B4 (de) * 2017-07-07 2019-04-18 Tenneco Gmbh Verfahren zum Betrieb eines Kraftfahrzeuggeräusch-Unterdrückungssystems
CN111720189B (zh) * 2019-03-22 2024-01-23 广州汽车集团股份有限公司 一种排气系统声品质调节装置与方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3412432A1 (de) * 1984-04-03 1985-10-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Schallabsorbierendes bauelement
DE3720946A1 (de) * 1986-07-03 1988-01-07 Volkswagen Ag Bodengruppe fuer ein kraftfahrzeug
DE3729765A1 (de) * 1987-09-05 1989-03-16 Bayerische Motoren Werke Ag Schallabsorptionssystem
US5119427A (en) * 1988-03-14 1992-06-02 Hersh Alan S Extended frequency range Helmholtz resonators
DE3816921A1 (de) * 1988-05-18 1989-11-30 Bayerische Motoren Werke Ag Anordnung zur verminderung des geraeuschpegels im innenraum eines kraftfahrzeugs
DE4011705A1 (de) * 1990-04-11 1991-10-17 Freudenberg Carl Fa Luftschall absorbierendes formteil
US5119902A (en) * 1990-04-25 1992-06-09 Ford Motor Company Active muffler transducer arrangement
DE4027511C1 (enrdf_load_stackoverflow) * 1990-08-30 1991-10-02 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V., 8000 Muenchen, De

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004016689A1 (de) * 2004-04-05 2005-10-27 Volkswagen Ag Verfahren und Vorrichtung zum Verbessern von Klangeigenschaften in einem Fahrzeug

Also Published As

Publication number Publication date
DE59308951D1 (de) 1998-10-08
EP0586831A2 (de) 1994-03-16
DE4226885C2 (de) 2001-04-19
EP0586831A3 (enrdf_load_stackoverflow) 1994-03-30
DE4226885A1 (de) 1994-02-17

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