WO2001096151A1 - Absorptive automobile coverings - Google Patents

Absorptive automobile coverings Download PDF

Info

Publication number
WO2001096151A1
WO2001096151A1 PCT/US2001/018526 US0118526W WO0196151A1 WO 2001096151 A1 WO2001096151 A1 WO 2001096151A1 US 0118526 W US0118526 W US 0118526W WO 0196151 A1 WO0196151 A1 WO 0196151A1
Authority
WO
WIPO (PCT)
Prior art keywords
panel
transport
holes
covering
vehicle
Prior art date
Application number
PCT/US2001/018526
Other languages
English (en)
French (fr)
Inventor
Graham Tompson
Original Assignee
Collins & Aikman Automotive Systems Limited
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 Collins & Aikman Automotive Systems Limited filed Critical Collins & Aikman Automotive Systems Limited
Priority to JP2002510307A priority Critical patent/JP2004516972A/ja
Priority to EP01946168A priority patent/EP1292466A1/en
Priority to US10/297,507 priority patent/US20040041428A1/en
Priority to CA002412009A priority patent/CA2412009A1/en
Priority to AU2001268251A priority patent/AU2001268251A1/en
Publication of WO2001096151A1 publication Critical patent/WO2001096151A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08Insulating elements, e.g. for sound insulation
    • B60R13/0815Acoustic or thermal insulation of passenger compartments
    • B60R13/083Acoustic or thermal insulation of passenger compartments for fire walls or floors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08Insulating elements, e.g. for sound insulation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08Insulating elements, e.g. for sound insulation
    • B60R13/0815Acoustic or thermal insulation of passenger compartments
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08Insulating elements, e.g. for sound insulation
    • B60R13/0838Insulating elements, e.g. for sound insulation for engine compartments

Definitions

  • the present invention relates to a method and apparatus for changing the acoustic properties of the inside of an enclosure.
  • the apparatus and method relate particularly to body panels, instrument panels, seats, shelves, floor mats, pillars and centre console areas of vehicles including interior and exterior portions such as the trunk or underbelly which direct noise inside the vehicle.
  • a Helmholtz resonator is an air-filled cavity with an opening.
  • the sound of a certain frequency can be absorbed by the resonator.
  • the frequency which is absorbed, the so-called resonant frequency depends on the volume of the cavity and the mass of air which oscillates in the opening.
  • a means of transport including a passenger space defined by enclosure walls, said means of transport further comprising a panel having a plurality of through-holes formed therein from an outer surface to an inner surface of said panel; said panel being attached to one of said enclosure walls in spaced apart relationship such that said outer surface faces away from said one of said enclosure walls.
  • the panel may be attached inside the passenger space.
  • the panel may also be attached outside of the passenger space.
  • the panel may be attached to the underbelly of the vehicle such that noise from the engine reflected back towards the vehicle by the driving surface, can be absorbed before entering the vehicle.
  • the acoustic performance of the interior of the car can be improved with the present invention.
  • the audio output of in- vehicle entertainment is distorted less.
  • overall acoustic performance is improved because the panel has a higher absorption across the audible frequency range resulting in less reflection of sound.
  • the distribution and size of the holes may be varied to optimise the range of frequencies which are absorbed.
  • Figure 1 shows a schematic representation of the cross-section of a member in accordance with the present invention
  • Figure 2 shows a schematic illustration of a door panel member in accordance with the present invention
  • FIG. 3 shows a schematic illustration of an accessory mat member in accordance with the present invention.
  • Figure 4 shows a graph of experimental results showing the variation in absorption coefficient with varying frequency for a door panel in accordance with the present invention and for a standard door panel.
  • Figure 1 shows a member 10 according to the present invention.
  • the member comprises a panel 12 with a plurality of through-holes 14 drilled therethrough from an outer surface 15 to an inner surface 17.
  • the panel 12 may be of any material but injection moulded plastics materials and wood are particularly suitable.
  • the member may be attached in spaced apart relationship to an inner wall of an enclosure to change the acoustic properties of the interior of the enclosure.
  • the space between the panel 12 and the inner wall 20 forms an empty cavity which can optionally be filled by an absorptive material such as open cell foams or mineral wool.
  • Typical enclosures which would benefit from the use of the member 10 are passenger enclosures in means for transport such as aeroplanes, road vehicles, trains, boats etc.
  • the member may also be attached on the exterior surface of walls of the enclosure such as to the underbelly so that noise from the engine which is reflected back towards the vehicle by the road surface is absorbed before entering the vehicle.
  • passenger space we mean any area of the car used by the passenger including, for example, the trunk. Such areas allow noise to enter the passenger seating areas, for example, when rear seat backs are folded down to increase trunk space.
  • a covering 16 is placed on the outer surface 15 of the panel 12 to cover the outer surface 15 of the panel and the plurality of through-holes 14.
  • the covering 16 should be of an acoustically absorptive material such as a woven textile fabric and would be approximately 5 millimetres thick.
  • the covering should be porous to the flow of air.
  • a leather or PNC covering with through holes could also be used.
  • the covering 16 should also be decorative.
  • the covering would be secured (for example by adhesion) only by the edges of its back onto the outer surface 15 of the panel 12.
  • the diameter, density and spacing of the holes and the number of holes per unit area may be varied.
  • the frequencies which are absorbed by the panel 12 vary according to the diameter and spacing of the holes, the material of which the panel 12 is made and its thickness.
  • the panel 12 is between 1 and 8 millimetres thick
  • the plurality of holes 14 have a diameter of between 2 and 12 millimetres and the hole surface area to panel surface area ratio should be between 0.03 and 0.30.
  • Each of the plurality of through holes 14 need not have the same diameter.
  • the inner surface 17 of the panel 12, on the opposite side to the outer surface 15, can optionally be covered by a layer 18 of either acoustically reflective or acoustically absorptive material.
  • a layer 18 of either acoustically reflective or acoustically absorptive material are open cell foams, mineral wool, fibrous materials, aluminum wool or glass fiber for instance and heavy mass layer or plastic sheet respectively.
  • Such a layer can have any thickness.
  • the advantage of this layer 18 is that noise from outside the interior of the vehicle may be blocked from entering the vehicle or may be absorbed before entering the interior compartment of the vehicle.
  • the layer 18 need not be in contact with the panel 12 but may be in spaced apart relation from it.
  • the member 10 is attached to a door panel 20 of a vehicle via fasteners 22 such that said covering 16 faces away from said door panel.
  • the member 10 could be attached in several other ways to door panel 20.
  • the member 10 attached to a door panel as illustrated in Figure 2 is in accordance with the present invention.
  • the member 10 is arranged such that there are a plurality of through-holes 14 over the majority, but not all, of the door panel 20.
  • certain areas 24 are reserved for attachments, such as door handles, ashtrays etc., to the door.
  • a floor carpet 40 for a vehicle is illustrated in which accessory mats 44 are placed on top of the floor carpet 40 in the regions of high wear.
  • the accessory mats 44 are comprised of members according to the present invention.
  • Floor mats 44 are individually placed in the floor wells of the car to avoid excess wear of the floor covering 40.
  • the floor mats 44 are comprised of members according to the present invention and include a plurality of through-holes 14 to adjust the acoustic response of the interior of the vehicle. The acoustic response can be varied by placing different accessory mats 44 in the vehicle with different hole densities, diameters and/or mat thicknesses.
  • Helmholtz Resonator and spring-mass absorber system air or insulation material
  • plastic layers plastic layers.
  • the formula which governs the resonant frequency (fo) of a Helmholtz resonator is:
  • c is the speed of the sound waves
  • S is the surface area of the opening
  • I is the length of the opening i.e. distance from the outside surface to the cavity
  • Al is a constant characteristic of the opening. Since the wavelength / of lower frequency noises is too long to have a Helmholtz quarter wave behind plastic panels, absorptive material can absorb more frequencies in a fraction of the thickness required in air alone.
  • Figure 4 is a graph showing the acoustic absorption of a typical side panel insulator (door) for the interior of a vehicle with varying frequency. The curves were measured by placing three different door panels in a reverberation room one after another and playing random white noise into the room and measuring the reverberation time.
  • the bottom curve in the Figure is for a door panel of the prior art, i.e. a panel (injection moulded plastic) covered by a non-woven fabric covering.
  • the middle line is the response for the same panel and covering but with holes drilled in the panel, i.e. a member in accordance with the present invention.
  • the side panel comprised of a member according to the present invention has a significantly improved absorption coefficient over the prior art. It is this frequency, range which is of interest since that range of frequencies is within the sensitivity of the human ear.
  • the member gives a flatter frequency response, meaning that when sounds are reflected, a more constant fraction of each frequency is reflected. This is important if the occupant of the vehicle is listening to music since a flatter frequency response of the panels will result in less distortion of the music because all frequencies will be reflected to the same extent.
  • the data values shown in Figure 4 are for a member with holes of 3.3 mm diameter, a panel thickness of 5 mm and a hole surface area to panel surface area ratio within the range of 0.03 to 0.3.
  • the top line in Figure 4 is for a covering and panel as in the middle line, but with a foam backing layer attached to the panel on the side opposite the covering. As can be seen, this absorptive layer further improves the absorbing properties of the door panel.
  • the member of the present invention can be used in any components in the interior of a car.
  • the two examples given are for a side panel insulator of a door and a floor mat of a car.
  • the instrument panel, the back of the seats, shelves, pillars and centre console can all be made of a member according to the present invention whilst retaining their visual impact.
  • panels may be attached outside of the passenger space such as on the outerside of the underbelly or in the trunk.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Passenger Equipment (AREA)
PCT/US2001/018526 2000-06-09 2001-06-08 Absorptive automobile coverings WO2001096151A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2002510307A JP2004516972A (ja) 2000-06-09 2001-06-08 輸送手段
EP01946168A EP1292466A1 (en) 2000-06-09 2001-06-08 Absorptive automobile coverings
US10/297,507 US20040041428A1 (en) 2000-06-09 2001-06-08 Absorptive automobile coverings
CA002412009A CA2412009A1 (en) 2000-06-09 2001-06-08 Absorptive automobile coverings
AU2001268251A AU2001268251A1 (en) 2000-06-09 2001-06-08 Absorptive automobile coverings

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0014171.3 2000-06-09
GB0014171A GB2363364A (en) 2000-06-09 2000-06-09 Acoustically absorptive panel

Publications (1)

Publication Number Publication Date
WO2001096151A1 true WO2001096151A1 (en) 2001-12-20

Family

ID=9893377

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/018526 WO2001096151A1 (en) 2000-06-09 2001-06-08 Absorptive automobile coverings

Country Status (7)

Country Link
EP (1) EP1292466A1 (ko)
JP (1) JP2004516972A (ko)
KR (1) KR20030022133A (ko)
AU (1) AU2001268251A1 (ko)
CA (1) CA2412009A1 (ko)
GB (1) GB2363364A (ko)
WO (1) WO2001096151A1 (ko)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006142885A (ja) * 2004-11-16 2006-06-08 Hayashi Engineering Inc 路上走行自動車の吸音構造
JP2006213172A (ja) * 2005-02-03 2006-08-17 Toyota Motor Corp 車両用ドア構造
EP1768100A1 (de) * 2005-09-22 2007-03-28 USM Holding AG Einrichtungssystem zur Beeinflussung der Raumakustik
FR2899537B1 (fr) * 2006-04-10 2008-05-30 Peugeot Citroen Automobiles Sa Dispositif d'absorption acoustique sous siege de vehicule automobile et analogue.
FR2946597B1 (fr) * 2009-06-11 2011-06-24 Peugeot Citroen Automobiles Sa Dispositif de garnissage a propriete d'absorption acoustique pour interieur de vehicule.
KR101601658B1 (ko) * 2014-10-23 2016-03-10 (주)대한솔루션 자동차의 플로어 카펫용 흡음재
CN106143343A (zh) * 2016-08-24 2016-11-23 无锡恒腾精密机械有限公司 一种抗冲击的汽车发动机保护盖

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4119783A1 (de) * 1991-06-15 1992-12-17 Irbit Research & Consulting Ag Schalldaemm- bzw. -daempfelement
EP0531761A1 (de) * 1991-08-26 1993-03-17 Illbruck Production S.A. Absorber
DE4212704A1 (de) * 1992-04-16 1993-10-21 Daimler Benz Ag Mittels des Hohlspritzverfahrens hergestellte Kunststoff-Wandungsteile
FR2698151A1 (fr) * 1992-10-29 1994-05-20 Sofitec Sa Panneau composite étanche et isolant acoustiquement pour habitacle de véhicule.
WO1994020292A1 (en) * 1993-03-04 1994-09-15 Eften Europa B.V. Improvements relating to bonded panel structures
DE4412427A1 (de) * 1993-04-19 1994-10-20 Nissan Motor Fahrzeug-Schallisolator
US5681072A (en) * 1994-04-15 1997-10-28 Georg Naher Gmbh Sound absorber for motor vehicles

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2930966C2 (de) * 1979-07-31 1983-12-22 Teroson Gmbh, 6900 Heidelberg Verfahren zur Herstellung eines schalldämmenden Formteils
DE2947607C2 (de) * 1979-11-26 1985-01-24 Fa. Carl Freudenberg, 6940 Weinheim Luftschallschluckende Verkleidung für eine Wand oder Decke
SE461048B (sv) * 1987-03-02 1989-12-18 Gyproc Ab Perforerad, ljudabsorberande skiva
DE9300152U1 (ko) * 1993-01-08 1993-03-11 Wilhelmi Werke Gmbh & Co Kg, 6335 Lahnau, De
DE4313911A1 (de) * 1993-04-28 1994-11-03 Naeher Georg Gmbh Geformter Schichtkörper, insbesondere Innenauskleidungsteil für Kraftfahrzeuge, sowie Verfahren und Vorrichtung zu seiner Herstellung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4119783A1 (de) * 1991-06-15 1992-12-17 Irbit Research & Consulting Ag Schalldaemm- bzw. -daempfelement
EP0531761A1 (de) * 1991-08-26 1993-03-17 Illbruck Production S.A. Absorber
DE4212704A1 (de) * 1992-04-16 1993-10-21 Daimler Benz Ag Mittels des Hohlspritzverfahrens hergestellte Kunststoff-Wandungsteile
FR2698151A1 (fr) * 1992-10-29 1994-05-20 Sofitec Sa Panneau composite étanche et isolant acoustiquement pour habitacle de véhicule.
WO1994020292A1 (en) * 1993-03-04 1994-09-15 Eften Europa B.V. Improvements relating to bonded panel structures
DE4412427A1 (de) * 1993-04-19 1994-10-20 Nissan Motor Fahrzeug-Schallisolator
US5681072A (en) * 1994-04-15 1997-10-28 Georg Naher Gmbh Sound absorber for motor vehicles

Also Published As

Publication number Publication date
GB2363364A (en) 2001-12-19
JP2004516972A (ja) 2004-06-10
AU2001268251A1 (en) 2001-12-24
EP1292466A1 (en) 2003-03-19
CA2412009A1 (en) 2001-12-20
KR20030022133A (ko) 2003-03-15
GB0014171D0 (en) 2000-08-02

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