US3087568A - Vibration-damped structure - Google Patents

Vibration-damped structure Download PDF

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Publication number
US3087568A
US3087568A US801197A US80119759A US3087568A US 3087568 A US3087568 A US 3087568A US 801197 A US801197 A US 801197A US 80119759 A US80119759 A US 80119759A US 3087568 A US3087568 A US 3087568A
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US
United States
Prior art keywords
layers
damping
acoustic
layer
viscous
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
US801197A
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English (en)
Inventor
Kurtze Guenther
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.)
RTX BBN Technologies Corp
Original Assignee
Bolt Beranek and Newman Inc
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 Bolt Beranek and Newman Inc filed Critical Bolt Beranek and Newman Inc
Priority to US801197A priority Critical patent/US3087568A/en
Priority to GB123/60A priority patent/GB948483A/en
Priority to FR817612A priority patent/FR1247649A/fr
Priority to BE587373A priority patent/BE587373A/fr
Priority to CH133960A priority patent/CH365890A/fr
Application granted granted Critical
Publication of US3087568A publication Critical patent/US3087568A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/30—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S297/00—Chairs and seats
    • Y10S297/01—Foam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24174—Structurally defined web or sheet [e.g., overall dimension, etc.] including sheet or component perpendicular to plane of web or sheet
    • Y10T428/24182—Inward from edge of web or sheet

Definitions

  • Damping of structure-borne sound vibrations is usually obtained by covering the structural elements with layers or coatings of sound-dissipative materials. in this way, energy is withdrawn from the sound-vibration waves by irreversible deformations of these coatings.
  • sound and vibrations as herein employed, are intended to connote generically all types of elastic vibrations and the like, whether audible, sub-audible or superaudible.
  • the present invention is more particularly concerned with the damping of double-walled structures and the like, and involves the use of viscous materials as dissipative media.
  • An object of the invention is to provide a new and improved vibration-damped structure.
  • a further object is to provide for the damping of double walls, partitions, panels, surfaces and the like, all hereinafter referred to by the generic term plates and the like.
  • Still an additional object is to provide a novel apparatus for damping vibrations traveling along any pair of vibration-wave propagating paths, whether of plate configuration or of other configuration for permitting the passage of sound or vibration waves therealong.
  • FIG. 1 is a transverse section of a damped double-plate structure constructed in accordance with the present invention.
  • FIG. 2 is a similar view of a preferred modification.
  • the invention is illustrated as applied to a double-plate structure, though it is to be understood that the teachings hereof may equally well be applied to other pairs of vibration-propagating pathstructures, including rods, tubes, pipes and the like, to mention but a few.
  • the plates 1 and 3 are shown generally co-extensive and of somewhat dilferent thickness so that the vibration-propagation or bending-wave velocity along the plates, say from one end to the other, is substantially different; in this case, the velocity C along the plate 1 is faster or greater than the velocity C along the plate 3.
  • Different velocities can also be obtained in other ways, as by using different materials, diiferent temperatures, and other techniques.
  • M mass per unit area of plate 3, and M bending wavelength in plate 1.
  • Equation 2 shows that the maximum obtainable damping its proportional to 1/) and hence decreases with decreasing frequency. This may be disadvantageous when damping at low frequencies is desired. For such cases,
  • a representative embodiment employed steel plates 1, 3 that were each 1 cm. thick, but with stiffness differing by a factor of ten, and a liquid medium 5 of silicon oil 1 cm. thick and of viscosity ,u 668.
  • the partitions 7 are disposed at intervals I only along one direction (shown longitudinally spaced), the distance or separation I being much less than the wavelengths of the band of frequencies to be damped.
  • the partitions 7 may also be of other materials, though they must have the property of being soft or highly compressible compared With the viscous liquid or other medium 5 in order to decouple adjacent medium regions from one another.
  • FIG. 2 yields a wider or broaderband frequency range of effective damping than for the construction of FIG. 1.
  • c 2c the frequency w of maximum damping is given substantially by p and the maximum obtainable loss tangent is P p N WI; 12am)
  • Equation 4 7; no longer depends on frequency so that the same amount of maximum damping can be obtained at any frequency by proper choice of [.L in Equation 3.
  • the plates 1 and 3 are made of light-transmitting material, such as transparent or translucent glass and the like, and the medium 5 is also light-transmitting, such as, for example, a clear mineral oil of suflicient viscosity, a sealed unit 1, 3. 5 could well serve as a vibrationdamped window or the like.
  • steel-like and liquid-oillike as employed in the claims are intended to embrace materials which are like steel or like liquid oil, respectively, in the function performed by the designated elements in the panel of the invention.
  • the spaced layers may be formed of gl-ass, which is steel-like as to stiffiness and rigidity when compared to a viscous liquid-oil-like material, including the oils, plastics, or semi-solids described.
  • An acoustic panel for damping a predetermined acoustic frequency f with a maximum degree of damping and frequencies above and below said predetermined frequency with substantial, but lesser damping comprising a pair of layers of stiff steel-like sheet material spaced apart, and a body of viscous liquid-oil-like material between and continuously contacting said layers, both said layers being much more rigid than said viscous material, one of said layers having an overall bending stiffness substantially greater than the overall bending stiffness of the other layer, whereby the acoustic bending wave propagating velocity C of one layer is substantially greater than the acoustic bending wave propagating velocity C of the other layer and the phases of acoustic vibrations along said layers are different, said panel having maximum damping at said predetermined acoustic frequency determined substantially by the relationship:
  • An acoustic panel for damping a predetermined acoustic frequency f with a maximum degree of damping and frequencies above and below said predetermined frequency with substantial, but lesser damping comprising a pair of layers of stiff steel-like sheet material spaced apart, a body of viscous liquid-oil-like material between and continuously contacting said layers, both said layers being much more rigid than said viscous material, one of said layers having an overall bending stiffness substantially greater than the overall bending stiffness of the other layer, whereby the acoustic bending wave propagating velocity 0 of one layer is substantially greater than the acoustic bending wave propagating velocity 0 of the other layer and the phases of acoustic vibrations along said layers are different, and a plurality of spaced partitions extending between said layers and dividing said viscous material, the compressibility of said partitions being substantially greater than that of said viscous material, said panel having maximum damping at said predetermined acoustic frequency determined substantially by the relationship:

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
US801197A 1959-03-23 1959-03-23 Vibration-damped structure Expired - Lifetime US3087568A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US801197A US3087568A (en) 1959-03-23 1959-03-23 Vibration-damped structure
GB123/60A GB948483A (en) 1959-03-23 1960-01-01 Vibration damped structure
FR817612A FR1247649A (fr) 1959-03-23 1960-02-04 Structure à vibrations amorties
BE587373A BE587373A (fr) 1959-03-23 1960-02-08 Structure à vibrations amorties.
CH133960A CH365890A (fr) 1959-03-23 1960-02-08 Structure destinée à amortir les ondes vibratoires dans une bande de fréquences prédéterminée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US801197A US3087568A (en) 1959-03-23 1959-03-23 Vibration-damped structure

Publications (1)

Publication Number Publication Date
US3087568A true US3087568A (en) 1963-04-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US801197A Expired - Lifetime US3087568A (en) 1959-03-23 1959-03-23 Vibration-damped structure

Country Status (5)

Country Link
US (1) US3087568A (fr)
BE (1) BE587373A (fr)
CH (1) CH365890A (fr)
FR (1) FR1247649A (fr)
GB (1) GB948483A (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421597A (en) * 1964-09-21 1969-01-14 Wiederhold Hermann Sound absorber
US3857457A (en) * 1973-12-11 1974-12-31 R Fox Device for inhibiting vibratory roof noise
US4461796A (en) * 1982-07-06 1984-07-24 Bridgestone Tire Company Limited Sound damping materials
US4683979A (en) * 1983-05-10 1987-08-04 Metzeler Kautschuk Gmbh Co-oscillating, volume-changing resonator in the form of a silencer
WO1998014368A3 (fr) * 1996-10-02 1998-07-09 Mc Donnell Douglas Corp Systeme de suppression du bruit a basse frequence
US20020150782A1 (en) * 2001-04-12 2002-10-17 Korea Institute Of Science And Technology Multi-layered metal plate with excellent damping capacity
RU2215211C2 (ru) * 2002-01-21 2003-10-27 ГФУП "Центральный научно-исследовательский институт им. акад. А.Н. Крылова" Вибропоглощающее устройство
US20050114053A1 (en) * 2003-10-14 2005-05-26 Southward Steve C. Magnetostrictive wavelet method for measuring pulse propagation time
US20070210636A1 (en) * 2006-03-02 2007-09-13 Wilfried Beneker Motor vehicle seat with portions made from composite sheet
US20070284185A1 (en) * 2006-06-07 2007-12-13 Foss Gary C Damped structural panel and method of making same
US20090055129A1 (en) * 2002-04-23 2009-02-26 Altieri Russell E Aircraft vehicular propulsion system monitoring device and method
US7721844B1 (en) * 2006-10-13 2010-05-25 Damping Technologies, Inc. Vibration damping apparatus for windows using viscoelastic damping materials
US20120279800A1 (en) * 2009-12-16 2012-11-08 Jean-Louis Guyader Multilayer composite material
US9285111B2 (en) * 2007-11-06 2016-03-15 Alvin E. Todd, Jr. Lighting fixture for ceiling fan
US20160291548A1 (en) * 2015-04-02 2016-10-06 CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement Shock-absorber device, in particular for a micromechanical clockwork component
US11543269B2 (en) 2020-01-27 2023-01-03 Temposonics GmbH & Co. KG Target detection in magnetostrictive sensors using a target frequency range

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3624986A1 (de) * 1986-07-24 1988-02-04 Focke & Co Maschine, insbesondere verpackungsmaschine
FR2715244B1 (fr) * 1994-01-19 1996-03-29 Bertin & Cie Procédé et dispositif d'absorption de l'énergie d'ondes acoustiques.
AU4550397A (en) 1997-10-09 1999-05-03 Strangaard, Christian Method of manufacturing a sandwich board and a board and structure manufactured by the method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1193013A (en) * 1916-08-01 Protective element
US2407400A (en) * 1943-05-19 1946-09-10 Clark W Chamberlain Method and apparatus for molecular absorption of vibration
US2724670A (en) * 1954-01-25 1955-11-22 Boston Woven Hose & Rubber Co Laminated packing
GB754299A (en) * 1954-05-10 1956-08-08 United States Steel Corp Structural panel and method of manufacture
FR1135422A (fr) * 1954-08-05 1957-04-29 Bayer Ag Structures composites en matière mousseuse dure
US2850109A (en) * 1954-04-27 1958-09-02 Benjamin Electric Mfg Co Light-permeable sound-absorbing panel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1193013A (en) * 1916-08-01 Protective element
US2407400A (en) * 1943-05-19 1946-09-10 Clark W Chamberlain Method and apparatus for molecular absorption of vibration
US2724670A (en) * 1954-01-25 1955-11-22 Boston Woven Hose & Rubber Co Laminated packing
US2850109A (en) * 1954-04-27 1958-09-02 Benjamin Electric Mfg Co Light-permeable sound-absorbing panel
GB754299A (en) * 1954-05-10 1956-08-08 United States Steel Corp Structural panel and method of manufacture
FR1135422A (fr) * 1954-08-05 1957-04-29 Bayer Ag Structures composites en matière mousseuse dure

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421597A (en) * 1964-09-21 1969-01-14 Wiederhold Hermann Sound absorber
US3857457A (en) * 1973-12-11 1974-12-31 R Fox Device for inhibiting vibratory roof noise
US4461796A (en) * 1982-07-06 1984-07-24 Bridgestone Tire Company Limited Sound damping materials
US4683979A (en) * 1983-05-10 1987-08-04 Metzeler Kautschuk Gmbh Co-oscillating, volume-changing resonator in the form of a silencer
WO1998014368A3 (fr) * 1996-10-02 1998-07-09 Mc Donnell Douglas Corp Systeme de suppression du bruit a basse frequence
US5895013A (en) * 1996-10-02 1999-04-20 Mcdonnell Douglas Corp. Low frequency noise suppression system
US20020150782A1 (en) * 2001-04-12 2002-10-17 Korea Institute Of Science And Technology Multi-layered metal plate with excellent damping capacity
US6638640B2 (en) * 2001-04-12 2003-10-28 Korea Institute Of Science And Technology Multi-layered metal plate with excellent damping capacity
RU2215211C2 (ru) * 2002-01-21 2003-10-27 ГФУП "Центральный научно-исследовательский институт им. акад. А.Н. Крылова" Вибропоглощающее устройство
US7925392B2 (en) 2002-04-23 2011-04-12 Lord Corporation Aircraft vehicular propulsion system monitoring device and method
US20090055129A1 (en) * 2002-04-23 2009-02-26 Altieri Russell E Aircraft vehicular propulsion system monitoring device and method
US20050114053A1 (en) * 2003-10-14 2005-05-26 Southward Steve C. Magnetostrictive wavelet method for measuring pulse propagation time
US20070210636A1 (en) * 2006-03-02 2007-09-13 Wilfried Beneker Motor vehicle seat with portions made from composite sheet
US7677664B2 (en) * 2006-03-02 2010-03-16 C. Rob. Hammerstein Gmbh & Co. Kg Motor vehicle seat with portions made from composite sheet
US20070284185A1 (en) * 2006-06-07 2007-12-13 Foss Gary C Damped structural panel and method of making same
US7721844B1 (en) * 2006-10-13 2010-05-25 Damping Technologies, Inc. Vibration damping apparatus for windows using viscoelastic damping materials
US9285111B2 (en) * 2007-11-06 2016-03-15 Alvin E. Todd, Jr. Lighting fixture for ceiling fan
US20120279800A1 (en) * 2009-12-16 2012-11-08 Jean-Louis Guyader Multilayer composite material
US8807276B2 (en) * 2009-12-16 2014-08-19 Institut National Des Sciences Appliquees De Lyon Multilayer composite material
US20160291548A1 (en) * 2015-04-02 2016-10-06 CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement Shock-absorber device, in particular for a micromechanical clockwork component
US10452027B2 (en) * 2015-04-02 2019-10-22 CSEM Centre Suisse d'Electronique et de Microtechnique SA—Recherche et Développement Shock-absorber device, in particular for a micromechanical clockwork component
US11543269B2 (en) 2020-01-27 2023-01-03 Temposonics GmbH & Co. KG Target detection in magnetostrictive sensors using a target frequency range

Also Published As

Publication number Publication date
GB948483A (en) 1964-02-05
FR1247649A (fr) 1960-12-02
BE587373A (fr) 1960-05-30
CH365890A (fr) 1962-11-30

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