WO1996038639A1 - A damped element - Google Patents
A damped element Download PDFInfo
- Publication number
- WO1996038639A1 WO1996038639A1 PCT/NZ1996/000055 NZ9600055W WO9638639A1 WO 1996038639 A1 WO1996038639 A1 WO 1996038639A1 NZ 9600055 W NZ9600055 W NZ 9600055W WO 9638639 A1 WO9638639 A1 WO 9638639A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plastically deformable
- energy absorbing
- element according
- absorbing material
- layer
- Prior art date
Links
- 239000011358 absorbing material Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 14
- 238000013016 damping Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000007765 extrusion coating Methods 0.000 claims description 4
- 239000011152 fibreglass Substances 0.000 claims description 4
- 229910000978 Pb alloy Inorganic materials 0.000 claims description 2
- 230000008021 deposition Effects 0.000 claims description 2
- 238000009713 electroplating Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 29
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C1/06—Frames; Stringers; Longerons ; Fuselage sections
- B64C1/061—Frames
- B64C1/062—Frames specially adapted to absorb crash loads
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
-
- 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
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/36—Columns; Pillars; Struts of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/16—Form or construction for counteracting blade vibration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
-
- 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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
-
- 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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
- F16F7/108—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted on plastics springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C2001/0054—Fuselage structures substantially made from particular materials
- B64C2001/0081—Fuselage structures substantially made from particular materials from metallic materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/30—Wind power
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Definitions
- This invention relates to reducing the effects of induced motion or displacement in elements such as beams or columns of a structure, in aerials and masts, and in a variety of other applications.
- Tuned mass dampers are used to damp vibration or motion in structures which may be exposed to wind, vibration from other sources, seismic motion or similar.
- tuned mass dampers may be used in telecommunications masts or aerials on top of buildings.
- Tuned mass dampers can be expensive to tune and are tuned to a particular frequency whereas the frequency of seismic motion is unpredictable.
- the invention may be used in large structures such as buildings or bridges to reduce the effects of motion induced during earthquakes or from strong winds.
- the invention may also be used to damp vibration from industrial machinery or engines or the like for example, or in other applications where it is desired to isolate from or damp any motion, vibrations or similar.
- the present invention provides an improved or at least alternative damping system.
- the invention comprises an element with a layer of a plastically deformable energy absorbing material over at least a part of an external and or internal surface of the element and bonded to or integral with the surface(s) of the element, which is effective to reduce or damp motion or vibration induced in the element.
- the element may be a longitudinally extending element such as a cylindrical or non- cylindrical tube, a column, a beam of any configuration, a propeller or turbine blade, an aerial or mast, or similar.
- the element may also be a planar element in which it is desired to reduce or damp motion or vibration such as part of a piece of equipment such as a printed circuit board or metal wall of a casing for example.
- the planar element may be a complex planar element, such as the floor pan or other panel of a motor vehicle, a panel of an aeroplane fuselage or wing, part of a ship, or similar.
- the plastically deformable energy absorbing material is preferably lead, but other plastically deformable energy absorbing materials which may be used include alloys of lead, aluminium at elevated temperature e.g. about 200°C, tin, zinc, brass, ion. super plastic alloys, or any other material having a low rate of work hardening.
- Thin sheets of lead may be bonded to surfaces of the element, such as the internal and/or external surfaces of a cylindrical element, the sides and/or top and bottom surfaces of a beam, or similar.
- the lead or other plastically deformable material may be applied by spraying, extrusion coating, electroplating, flux or electronic deposition, or other technique. Bonding of the lead to the surface(s) of the element may be by mechanical or chemical bonding.
- the lead or other plastically deformable material may be applied to the surface of the element, such as the entire external and/or internal surfaces of a cylindrical or non-cylindrical tube or column, the external surfaces of a solid column or similar, or to only part of the surface by applying the lead or similar in zones or regions so positioned to effectively reduce or damp any motion or vibration induced in the element.
- strips of lead or other plastically deformable material may be bonded to a planar surface or similar.
- Lead may be applied by spraying or coating over selected regions.
- the element will be formed of a material which is elastic relative to the plastic damping material which is applied to the element, and the element will typically be formed of steel or similar, or fibreglass or other synthetic material having properties of elasticity which it is desired to damp.
- Elements of the invention may be used in the construction of larger structures such as aerials or masts or pylons to isolate them from vibration or motion due to winds. They may also be used in the construction of large structures such as buildings or bridges to damp seismic motion. They may be used in any other application were it is desired to isolate from or damp any motion, vibrations, or similar. Small or miniature size elements of the invention may be used in sensitive electronic equipment such as the mechanism of a video recorder etc or in other similar applications. Numerous applications of elements of the invention are envisaged where damping or reduction of vibration or motion is required.
- the layer of lead or other plastically deformable material may optionally comprise a further layer over or surrounding it, such as a layer of steel or other material to enhance or vary the mechanical properties of the element, or a protective layer such as a plastic or synthetic layer or similar.
- the invention also comprises a method of manufacturing an element or reducing or damping motion or vibration induced in an element, comprising providing a layer of a plastically deformable energy absorbing material over at least a part of an external and/or internal surface of the element bonded to or integral with the surface(s) of the element, which is effective to reduce motion or vibration induced in the element.
- Figure 1 shows a section of a tubular element having a lead layer on its exterior
- Figure 2 is a cross-sectional view of the tubular element of Figure 1 ,
- Figure 3 shows a section of a tubular element having a lead layer on its interior
- Figure 4 is a cross-sectional view of the tubular element of Figure 3
- Figure 5 shows a section of a tubular element having lead layers on the exterior and interior of the element
- Figure 6 is a cross-sectional view of the tubular element such of Figure 5
- Figure 7 shows an I beam having lead layers applied to both sides of the vertical web of the I beam
- Figure 8 shows an I beam having lead layers applied to the top and bottom horizontal surfaces of the I beam
- Figure 9 shows an L beam or element having a lead layer applied to the vertical and horizontal surfaces on one side of the element
- Figure 10 shows part of a hollow blade of a propeller or turbine having a lead coated layer applied to the interior
- Figure 11 shows a planar element having lead applied to a part of one side of the planar element.
- the tubular element 1 of Figure 1 has a thin layer of lead 2 applied to the exterior of the tubular element.
- the tubular element 1 may be a telecommunications aerial on top of a building for example, which may be subjected to buffeting from high winds, which it is desired to damp against motion or vibration.
- the aerial may be formed of steel or any other metal, fibreglass or other synthetic materials, or similar.
- the tubular element may be a steel pipe which serves as a transverse beam, a vertical or near vertical upright or cylindrical column.
- the tubular element may be part of a structure comprising other elements of the invention or other undamped elements.
- Figure 2 is a cross-sectional view through the tubular element such as in Figure 1 showing the lead layer on the exterior.
- the lead layer may typically be of a thickness 1 ⁇ m to 10 mm giving a total damping for the structure of from 1 to greater than 100% of critical damping.
- the thickness of the lead layer may be typically in the range 1/1000 *1* of the wall thickness of the element up to or greater than the wall thickness of the element.
- the lead layer may be applied by wrapping a thin lead sheet around the tubular element and bonding the lead sheet to the exterior surface of the element, extrusion coating of a thin lead layer over the element, spraying of a thin layer of lead over the element, or any other suitable application technique.
- Figure 3 shows a similar tubular element, in this case with a lead layer 2 applied and bonded to the interior surface of the element
- Figure 4 shows a similar tubular element having lead layers 2 applied both to the exterior and interior surfaces of the tubular element 1.
- the lead layer(s) may be applied as a continuous layer over the exterior of the tubular elements, or in spaced bands around the circumference of the tubular elements, or as strips along the exterior or interior surfaces of the tubular elements, or similar, which may be positioned to shift the resonant frequency or points of resonance of the element.
- the tubular element may be cylindrical or non-cylindrical such as oval or octagonal in cross-sectional shape for example.
- the tubular element may be of constant or reducing or increasing cross- sectional dimension over its length.
- Figures 7 and 8 show I beams 3 with lead layers 2 applied thereto in accordance with the invention.
- a thin layer of lead is applied by bonding, coating or spraying or similar to each side of the vertical web of the I beam, to provide damping primarily against horizontal vibration in the beam.
- lead layers 2 are applied to the top and bottom surfaces of the beam as shown, to enhance damping against vertical vibration.
- lead layers may be applied to both the vertical and horizontal surfaces of the beams.
- Figure 9 shows an L beam or angle 4 having lead 2 applied to one vertical face and one horizontal face of the element.
- the lead may be applied in any thickness to provide the desired damping, by bonding thin sheets of lead to the beam surfaces, spraying or extrusion coating or similar.
- Figure 10 shows a planar element 5 having lead applied to one side thereof to reduce vibration in the element.
- the lead is shown applied as thin sheet strips but alternatively lead or other plastically deformable material may be applied over the whole of one or both surfaces of the planar element.
- the planar element may be a complex planar shape such as the body panel of a motor vehicle, a hull or structural panel of a ship, a panel which is part of a wing or fuselage of an aircraft or similar, to reduce or damp vibration.
- the damping material may be applied as strips or in specific regions to shift the resonant frequency or points of resonance of the element.
- Figure 11 shows part of a blade 6 of a propeller or wind turbine.
- a thin coating of lead 2 may be applied to the inside surface of the hollow blade 6.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Emergency Management (AREA)
- Business, Economics & Management (AREA)
- Chemical & Material Sciences (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Electromagnetism (AREA)
- Acoustics & Sound (AREA)
- Paleontology (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Combustion & Propulsion (AREA)
- Composite Materials (AREA)
- Vibration Prevention Devices (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU58480/96A AU5848096A (en) | 1995-06-02 | 1996-05-31 | A damped element |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ27228195 | 1995-06-02 | ||
NZ272281 | 1995-06-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996038639A1 true WO1996038639A1 (en) | 1996-12-05 |
Family
ID=19925284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NZ1996/000055 WO1996038639A1 (en) | 1995-06-02 | 1996-05-31 | A damped element |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU5848096A (en) |
WO (1) | WO1996038639A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009034292A2 (en) * | 2007-09-11 | 2009-03-19 | Blade Dynamics Limited | A root end joint for a wind turbine blade |
EP3453904A1 (en) * | 2017-09-08 | 2019-03-13 | China Communications Construction Company Limited | Bearing structural member, support, joint assembly and tube section assembly |
CN111810355A (en) * | 2020-08-05 | 2020-10-23 | 中国华能集团清洁能源技术研究院有限公司 | Blade torsion vibration damping device and method for horizontal-axis wind generating set |
USD984032S1 (en) * | 2022-05-06 | 2023-04-18 | Linhai Ruichen Lighting Co., Ltd. | LED light string insulation core |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU1917534A (en) * | 1934-09-05 | 1927-03-28 | Pfistershammer Josef | Improvements in or relating to built-up tubular posts |
DE1112350B (en) * | 1959-07-03 | 1961-08-03 | United Aircraft Corp | Damped body formed as a hollow body and process for its production |
US3088561A (en) * | 1958-11-06 | 1963-05-07 | Wright Barry Corp | Damped structures |
DE2359938A1 (en) * | 1973-12-01 | 1975-06-05 | Motoren Turbinen Union | Damped impeller blades for turbines - central area has film of plastics matl. which will withstand temp of at least 300 deg. cent. |
FR2296363A7 (en) * | 1974-12-27 | 1976-07-23 | Rovers Pierre | Box type loud speaker enclosure - has lead covered internal layer to reflect sound and tension wire to reduce vibration |
GB2082936A (en) * | 1979-03-08 | 1982-03-17 | Secr Defence | Materials suitable for the absorption of sound |
US4566231A (en) * | 1983-09-27 | 1986-01-28 | The Boeing Company | Vibration damping stiffener |
EP0309850A2 (en) * | 1987-09-28 | 1989-04-05 | Siemens Aktiengesellschaft | Spurious electromagnetic-mode suppression arrangement in a waveguide installation |
EP0333244A1 (en) * | 1988-03-10 | 1989-09-20 | "EMIEL VANDERSTRAETEN" Société de personnes à responsabilité limitée | Sound insulating and/or vibration-damping cover, element incorporating such a cover, and method of applying the latter |
US4959934A (en) * | 1988-01-27 | 1990-10-02 | Kajima Corporation | Elasto-plastic damper for use in structure |
DE3911100A1 (en) * | 1989-04-06 | 1990-10-18 | Siedle Horst Kg | Device for (moving) electrical contact making |
US5122408A (en) * | 1990-10-31 | 1992-06-16 | The Doe Run Company | Two-sided lead composite and method of making same |
US5129266A (en) * | 1991-02-28 | 1992-07-14 | Eastern Instrument Laboratories, Inc. | Mechanical weigh beam and damping circuit therefor |
WO1993008023A1 (en) * | 1991-10-22 | 1993-04-29 | Brigham Young University | Improved damping in composite structures through stress coupling |
EP0544353A1 (en) * | 1991-11-20 | 1993-06-02 | Harm Sjoerd Boonstra | Insulation material |
EP0565464A1 (en) * | 1992-04-07 | 1993-10-13 | A.E.M.C., Société à Responsabilité Limitée | Method for damping electromagnetic waves, especially in a Faraday cage |
WO1993020904A1 (en) * | 1992-04-14 | 1993-10-28 | Skis Rossignol S.A. | Golf club head |
-
1996
- 1996-05-31 AU AU58480/96A patent/AU5848096A/en not_active Abandoned
- 1996-05-31 WO PCT/NZ1996/000055 patent/WO1996038639A1/en active Application Filing
Patent Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU1917534A (en) * | 1934-09-05 | 1927-03-28 | Pfistershammer Josef | Improvements in or relating to built-up tubular posts |
US3088561A (en) * | 1958-11-06 | 1963-05-07 | Wright Barry Corp | Damped structures |
DE1112350B (en) * | 1959-07-03 | 1961-08-03 | United Aircraft Corp | Damped body formed as a hollow body and process for its production |
DE2359938A1 (en) * | 1973-12-01 | 1975-06-05 | Motoren Turbinen Union | Damped impeller blades for turbines - central area has film of plastics matl. which will withstand temp of at least 300 deg. cent. |
FR2296363A7 (en) * | 1974-12-27 | 1976-07-23 | Rovers Pierre | Box type loud speaker enclosure - has lead covered internal layer to reflect sound and tension wire to reduce vibration |
GB2082936A (en) * | 1979-03-08 | 1982-03-17 | Secr Defence | Materials suitable for the absorption of sound |
US4566231A (en) * | 1983-09-27 | 1986-01-28 | The Boeing Company | Vibration damping stiffener |
EP0309850A2 (en) * | 1987-09-28 | 1989-04-05 | Siemens Aktiengesellschaft | Spurious electromagnetic-mode suppression arrangement in a waveguide installation |
US4959934A (en) * | 1988-01-27 | 1990-10-02 | Kajima Corporation | Elasto-plastic damper for use in structure |
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WO2009034292A2 (en) * | 2007-09-11 | 2009-03-19 | Blade Dynamics Limited | A root end joint for a wind turbine blade |
WO2009034292A3 (en) * | 2007-09-11 | 2009-09-03 | Blade Dynamics Limited | A root end joint for a wind turbine blade |
US8425195B2 (en) | 2007-09-11 | 2013-04-23 | Blade Dynamics Limited | Wind turbine blade |
EP3453904A1 (en) * | 2017-09-08 | 2019-03-13 | China Communications Construction Company Limited | Bearing structural member, support, joint assembly and tube section assembly |
CN111810355A (en) * | 2020-08-05 | 2020-10-23 | 中国华能集团清洁能源技术研究院有限公司 | Blade torsion vibration damping device and method for horizontal-axis wind generating set |
WO2022027827A1 (en) * | 2020-08-05 | 2022-02-10 | 中国华能集团清洁能源技术研究院有限公司 | Blade torsion vibration damping apparatus and method for horizontal-axis wind power generator set |
USD984032S1 (en) * | 2022-05-06 | 2023-04-18 | Linhai Ruichen Lighting Co., Ltd. | LED light string insulation core |
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