EP0682335A2 - Dispositif absorbeur lamellé - Google Patents

Dispositif absorbeur lamellé Download PDF

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Publication number
EP0682335A2
EP0682335A2 EP95106848A EP95106848A EP0682335A2 EP 0682335 A2 EP0682335 A2 EP 0682335A2 EP 95106848 A EP95106848 A EP 95106848A EP 95106848 A EP95106848 A EP 95106848A EP 0682335 A2 EP0682335 A2 EP 0682335A2
Authority
EP
European Patent Office
Prior art keywords
lamellae
arrangement
vibrating bodies
sound waves
slats
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
Application number
EP95106848A
Other languages
German (de)
English (en)
Other versions
EP0682335B1 (fr
EP0682335A3 (fr
Inventor
Franz Josef Wolf
Nenad Cvjeticanin
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.)
Woco Franz Josef Wolf and Co GmbH
Original Assignee
Woco Franz Josef Wolf and Co GmbH
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 Woco Franz Josef Wolf and Co GmbH filed Critical Woco Franz Josef Wolf and Co GmbH
Publication of EP0682335A2 publication Critical patent/EP0682335A2/fr
Publication of EP0682335A3 publication Critical patent/EP0682335A3/fr
Application granted granted Critical
Publication of EP0682335B1 publication Critical patent/EP0682335B1/fr
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
    • G10K2210/3214—Architectures, e.g. special constructional features or arrangements of features
    • 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

Definitions

  • the present invention relates to a device for damping sound waves propagating in a gaseous medium in particular according to the preamble of claim 1.
  • structure-borne noise arises, for example, from imbalance in rotating machine parts, which therefore emanates from mass-contaminated exciters with almost every translational or rotary movement and therefore almost is inevitable.
  • vibrations are passed on to the periphery of, for example, the internal combustion engine or else, for example, a turbine wheel or fan in the form of sound waves in the air area surrounding the devices mentioned.
  • damping devices which absorb the vibrational energy transported by the sound waves and ultimately convert it into heat, i.e. so-called dissipative silencers, which have a relatively broadband effect.
  • foams or fibrous materials such as mineral wool mats or felt mats, are known in this area, which are said to absorb sound energy as swallowing materials.
  • damping devices are, for example, resonating dampers, that is to say so-called impedance silencers in the form of resonators which do not absorb the sound waves but reflect them, which results in the need for these dampers to be matched to the respective frequencies of the sound waves and therefore have the disadvantage that they have tuned frequencies bound to the respective intended use and therefore these dampers cannot be used universally.
  • Areas of application of the absorbent dampers for example in the form of mineral wool mats or felt mats, are often the areas of room air conditioning, where such arrangements can be provided in the air ducts, so that the fan noises formed in these arrangements, flow noises in the duct network, at corners, deflections, cross-sectional reductions, grilles or can easily be absorbed by high air speeds.
  • the present invention is therefore based on the task of eliminating the disadvantages, to provide a device for damping airborne sound, with which extremely good damping can be achieved and with which an inexpensive arrangement is also created, which is also adaptable to a variety of uses is.
  • a device for damping sound waves propagating in a gaseous medium in particular which has a large number of vibrating vibrating bodies.
  • the invention is therefore based on the basic idea of providing a large number of vibratable individual bodies which the sound waves encounter on their propagation path in the gaseous medium and which thus stimulate the vibrating bodies which are capable of individual vibrations to oscillate, whereby at least part of the energy inherent in the sound waves is converted into kinetic energy the individually vibratable vibrating body is converted, which is then ultimately converted into heat by creating internal friction in the vibrating body that can vibrate individually or by rubbing these vibrating bodies against one another or by creating a mixed state of these two frictional states.
  • the vibrating bodies are lamellae which are arranged essentially parallel to one another and essentially lying one against the other. This arrangement supports the above-mentioned friction of the individual vibrating bodies, that is to say of the lamellae against one another.
  • the slats are elongated in such a way that their longitudinal extension is greater than or at least equal to their width extension, which results in an overall large possible friction surface of the individual slats.
  • the lamellae can be formed in one piece in such a way that there is a one-piece arrangement with a large number of individual lamellae which can largely vibrate individually.
  • this means that an easy-to-manufacture lamella arrangement is provided, which for example can have a rectangular configuration in plan view, the individual lamellae accordingly being connected to one another on the elongated outer circumference of the lamella arrangement and freely swinging in the area of the interior of the rectangular arrangement , so that they can rub against each other along the long sides of the individual lamellae formed thereby.
  • the slats are arranged in a housing arrangement such that a clear space is provided between the top and / or bottom of the housing arrangement and the slats, within which an oscillatory movement of the slats can be carried out.
  • a clear space is provided between the top and / or underside of the housing arrangement and the lamella arrangement in such a way that the lamellae can be set in vibration without hitting the housing arrangement.
  • a medium which is in particular gaseous and which dampens the oscillating movement of the slats can be provided in the free space between the slats and the top and / or bottom of the housing arrangement.
  • This medium which can be air, for example, fulfills the stated task, namely to dampen the oscillating movement of the slats and, during the oscillating movement of the slats, flows through the gap between the slats, which is released by the slats lying against one another in the event of vibrations, as a result of which an intensive flow movement of the air molecules in These gaps thus formed take place in such a way that the energy of the sound waves transmitted to the lamellae is ultimately converted into kinetic energy by the movement of the lamellae and through the flow movement of the air molecules and the associated friction into heat and thus dissipated.
  • the free space can have a clear height of preferably in the range of greater than approximately 5 mm. This ensures that, on the one hand, the appropriately designed lamellae do not abut the upper or lower side of the housing arrangement during their oscillatory movement and that a sufficiently dimensioned air space acting as a cushion is formed in the free space.
  • the individual slats preferably have a width of approximately 5 to 10 mm and each have a height of approximately 1.5 to 2 mm when viewed in a cross section of the slats. This design also creates a vibration of the individual lamellae which is, however, associated with a certain rigidity.
  • a lamella arrangement is provided within the housing arrangement and, in turn, a second lamella arrangement is arranged on this lamella arrangement, which largely rests on the latter, so that there is a crossing angle of 90 ° between the two individual slats of the individual slat arrangement results.
  • any intermediate shape of the crossing angle between individual slat layers is also possible, so that, for example, three slat arrangements can also be provided one above the other, the individual slats of the respective slat arrangement crossing at an angle of 90 ° to one another.
  • the device according to the invention has a plurality of individual, preferably integrally formed, lamella arrangements, each having individually vibratable lamellae in such a way that the lamellae arrangements are each largely contiguous to form an overall arrangement.
  • the device has an outer contour, which can be adapted to any purpose.
  • a device that is rectangular in plan view can be created, or else a damping device that corresponds to a hollow cylindrical arrangement can enclose an electric motor, for example in motor vehicle construction, or also as a segment of a segment of a three-phase alternator arranged in the engine compartment.
  • the slats are made of a plastic in an injection molding process.
  • a so-called recyclate can also be used, for example, so that an extremely inexpensive arrangement can be created.
  • a plurality of vibrating vibrating bodies is used for damping sound waves propagating in a gaseous medium in particular.
  • the invention provides an extremely inexpensive device for damping airborne sound, which has slats for noise reduction instead of the usual sound barriers which are provided with fiber or foam.
  • this arrangement also offers the advantages of the recyclability of the slats, which are preferably made of plastic, and the advantage of being insensitive to dirt, for example with respect to water, dust and oil, without fear of a reduction in the noise reduction properties.
  • the lamellae lying parallel to each other can be produced from a plastic by injection molding.
  • the slats can be provided with a frame on the circumference and as a compact structure in the inside of a housing arrangement, for example an acoustic hood be attached. Such an arrangement can be provided, for example, in the area of motor vehicle construction between the trunk of a passenger car and the passenger compartment in the area of the parcel shelf.
  • An air cushion is provided between the slats and the acoustic hood, which dampens the vibratory movement of the slats and contributes to energy dissipation.
  • the sound waves generated by the noise source hit the surface of the absorber, causing the slats to vibrate. This creates an intense friction of the lamellae and the air molecules penetrating them, which results in a conversion of the sound energy into heat and also kinetic energy of the lamellae, with the result that the sound level of sound waves radiated into the free space is significantly reduced.
  • the device in the embodiment shown has a lamella arrangement 1, a housing arrangement 2 and a free space 3.
  • the lamella arrangement is designed in the form of an arrangement which is rectangular in plan view and which has a plurality of lamellae 4 arranged in parallel and, as FIG. 3 shows, adjoining one another.
  • the lamella arrangement arranged in a trough-shaped housing 2 such that a space 3 is provided in the housing 2 above and below the lamella arrangement.
  • the lamella arrangement 1 has a multiplicity of individual lamellae 4 running parallel to one another along their respective longitudinal sides, which are formed in one piece in the region of the respective opposite ends of the individual lamellae 4, so that a lamella arrangement 1 is created which can be easily inserted or molded into the housing 2 is.
  • the arrangement is such that a shoulder 5 is arranged on the housing 2 in the region of the bearing point of the plate arrangement 1 in the housing 2, on which the plate arrangement 1 can be placed.
  • Fig. 4 shows the lamella arrangement 1 in a second embodiment, which results from the fact that a second lamella arrangement 1 is applied from above to the lamella arrangement shown in Fig. 2 of the drawing, so that the one shown in Fig. 4 and only for clarification arrangement shown results.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Building Environments (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Vibration Prevention Devices (AREA)
EP95106848A 1994-05-09 1995-05-05 Dispositif absorbeur lamellé Expired - Lifetime EP0682335B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4416361A DE4416361A1 (de) 1994-05-09 1994-05-09 Lamellenabsorber
DE4416361 1994-05-09

Publications (3)

Publication Number Publication Date
EP0682335A2 true EP0682335A2 (fr) 1995-11-15
EP0682335A3 EP0682335A3 (fr) 1998-01-07
EP0682335B1 EP0682335B1 (fr) 2001-12-12

Family

ID=6517701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95106848A Expired - Lifetime EP0682335B1 (fr) 1994-05-09 1995-05-05 Dispositif absorbeur lamellé

Country Status (6)

Country Link
US (1) US5719359A (fr)
EP (1) EP0682335B1 (fr)
KR (1) KR950034050A (fr)
DE (2) DE4416361A1 (fr)
ES (1) ES2169738T3 (fr)
MX (1) MX9501846A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109669317A (zh) * 2017-10-16 2019-04-23 精工爱普生株式会社 吸音器和投影仪

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6983820B2 (en) 2001-09-07 2006-01-10 Avon Polymer Products Limited Noise and vibration suppressors
NO322685B1 (no) 2005-03-23 2006-11-27 Deamp As Plateelement
US8235169B2 (en) * 2008-08-19 2012-08-07 Siemens Aktiengesellschaft Noise-reducing device and method for reducing noise
US10149044B2 (en) * 2014-07-21 2018-12-04 Nokia Technologies Oy Vibration damping structure for audio device
US10657947B2 (en) * 2017-08-10 2020-05-19 Zin Technologies, Inc. Integrated broadband acoustic attenuator
CN113302087B (zh) * 2019-01-11 2024-04-09 富士胶片株式会社 电动车用消音部件

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2725186A1 (de) * 1976-06-04 1977-12-15 Lord Corp Schallschluckende vorrichtung
GB2024380A (en) * 1978-04-29 1980-01-09 Rolls Royce Acoustic linings for fluid flow ducts
EP0246464A1 (fr) * 1986-05-14 1987-11-25 Pape, Hans Couche absorbante d'ondes acoustiques pour un mur ou une couverture
EP0337077A1 (fr) * 1988-04-13 1989-10-18 Deutsche Aerospace AG Dispositif d'amortissement des vibrations acoustiques et des corps solides
EP0521740A1 (fr) * 1991-04-25 1993-01-07 Hutchinson Matériau de protection acoustique et dispositif incorporant un tel matériau

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2534137A (en) * 1946-03-25 1950-12-12 M B Mfg Company Inc Vibration isolator pad
US2989136A (en) * 1959-04-14 1961-06-20 Wohlberg George Sound attenuation
US4821841A (en) * 1987-06-16 1989-04-18 Bruce Woodward Sound absorbing structures
US4842097A (en) * 1987-06-16 1989-06-27 Woodward Bruce Sound absorbing structure
JP3076945B2 (ja) * 1993-06-15 2000-08-14 松下電器産業株式会社 吸音装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2725186A1 (de) * 1976-06-04 1977-12-15 Lord Corp Schallschluckende vorrichtung
GB2024380A (en) * 1978-04-29 1980-01-09 Rolls Royce Acoustic linings for fluid flow ducts
EP0246464A1 (fr) * 1986-05-14 1987-11-25 Pape, Hans Couche absorbante d'ondes acoustiques pour un mur ou une couverture
EP0337077A1 (fr) * 1988-04-13 1989-10-18 Deutsche Aerospace AG Dispositif d'amortissement des vibrations acoustiques et des corps solides
EP0521740A1 (fr) * 1991-04-25 1993-01-07 Hutchinson Matériau de protection acoustique et dispositif incorporant un tel matériau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Noise and vibration:",1982,S.483,John Wiley & Sons *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109669317A (zh) * 2017-10-16 2019-04-23 精工爱普生株式会社 吸音器和投影仪

Also Published As

Publication number Publication date
EP0682335B1 (fr) 2001-12-12
DE59509926D1 (de) 2002-01-24
ES2169738T3 (es) 2002-07-16
KR950034050A (ko) 1995-12-26
US5719359A (en) 1998-02-17
DE4416361A1 (de) 1995-11-16
MX9501846A (es) 1997-02-28
EP0682335A3 (fr) 1998-01-07

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