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
  • 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

Definitions

• the present invention relates to a vibratory wave damping device of variable amplitude or not and an element, in particular a construction element, incorporating such a device.
• shock absorbers formed of elastic blocks, such as rubber blocks, or in elastic synthetic material called “silent-blocks", capable of separating or isolating the vibrating element from its support or, conversely, the element carried from its vibrating support.
• the major drawback of these devices is linked to their lack of resistance over time and to their low mechanical rigidity which prevent them from being used as a rigid support structure.
• the connections between the vibrating structure and its environment, in particular a fixed support must have a high rigidity.
• the filtering capacities of such devices under heavy load are low.
• Another solution consists in attenuating the emission of vibrations by a device incorporated in parallel with the vibrating structure.
• This technique allows extremely high intrinsic damping of the structure under low load.
• An exemplary embodiment of such a structure is described in particular in the international application. O / 97.11451.
• such structures cannot be used as an element of interposition between vibrating structure and support.
• such structures are only effective in the case of vibrations normal to the emissive walls.
• there is another type of damper in which the viscoelastic material is replaced by a suitable geometry in which a liquid flows. This is the case of the damping device described in patent US-A-5,054,753 in which the liquid can compress a spring. Again, the rigidity following a component parallel to the vibratory wave applied to the incident surface of the structure is low and the deformations of this structure uncontrollable.
• An object of the present invention is to provide a vibration wave damping device, the design of which makes it possible to be interposed between the vibrating structure and the support, ensuring precise maintenance in position of the vibrating structure due to the rigidity of the damping device while ensuring high vibration filtration power.
• Another object of the present invention is to provide a vibration wave damping device having the advantages of a traditional rubber damping block in terms of absorption of the filtrations while preserving an extremely high rigidity.
• the subject of the invention is a vibratory wave damping device of variable or not amplitude, intended in particular to be interposed between a vibrating structure and a fixed support structure, characterized in that it is in the form of '' a beam or a section of rigid beam in the axis of the neutral fiber and having, between an incident surface and a radiating surface, rigid connecting walls shaped to present by geometrical construction points or zones of localized geometric weakness ensuring maintenance of the rigidity of said walls in one axis of the neutral fiber while allowing deformation of said walls in two opposite directions under the effect of the vibratory wave applied to the incident surface, said connecting walls urging during their deformation at least a damping element, preferably housed inside the beam or the edge of the beam.
• this damping device can be interposed between a vibrating structure and a support, ensuring precise maintenance in position of the vibrating structure due to its rigidity, while guaranteeing a high filtering power of vibrations between structure. vibrating and support.
• Such a damping device has a structure capable of associating a rigid behavior in dynamics and in static with a viscoelastic behavior in precise fields of low frequencies.
• Another subject of the invention is an element, in particular a construction element, of the type consisting of a network of elementary meshes, characterized in that each elementary mesh is constituted by a damping device of the preceding type.
• Examples of embodiments include cushioning floors or the like.
• Figure 1 shows a schematic sectional view of a device according to the invention
• Figures 2 to 4 show schematic sectional views corresponding to alternative embodiments of the damping device shown in Figure 1.
• the vibration damping device of variable or non-variable amplitude, object of the invention is more particularly intended to be disposed between a vibrating structure and a support of said structure. It can therefore be used as a replacement for elastic shock-absorbing blocks used in particular in the naval, aeronautical, space, automobile and railway industries.
• This device is in the form of a beam 1 or a slice of beam 1 rigid in the axis of the neutral fiber.
• this structure could be made of metallic, polymer and composite materials.
• This beam 1 or slice of the beam can be hollow or solid and produced symmetrically or not.
• This beam or slice of beam also has, between an incident surface 2 and a radiating surface 3, connecting walls 4.
• These connecting walls 4 rigid in the axis of the neutral fiber to give the device its rigidity, are shaped to be, under the effect of a vibrating o wave, deformable in two opposite directions shown in Dl in the figures.
• the connecting walls 4 have points or zones 7 of geometrically localized rigid weaknesses ensuring the rigidity of said walls in the neutral fiber axis while allowing deformation along Dl.
• these connecting walls 4 affect the shape of dihedrons, the edge of the dihedron constituting by construction the zone 7 of weakness, this edge kept rigid along the axis of the neutral fiber allowing deformation of the following dihedron a direction D1 perpendicular to the direction of the vibratory wave o applied to the incident surface.
• the lateral connecting walls 4 deform in a direction substantially parallel to the incident surface 2. The deformation of the lateral walls 4 due to the construction and the geometric shape of these walls 4 and the presence of the zones 7 of weakness makes it possible to have non-randomly deformable walls while maintaining rigidity along the axis of the neutral fiber.
• this vibratory wave o can emanate in particular from any vibrating structure, such as a machine tool or the like.
• the deformations of the connecting walls 4, under the effect of this vibrational wave o will be micro-displacements between the fraction of micron and the meter due to the rigidity of the structure which may be included in the range [1,000 - 200,000] N / mm.
• At least one component of the deformation 1 of the walls 4 connecting the beam 1 is perpendicular to the direction of the vibratory wave o applied to the incident surface 2.
• these connecting walls 4 preferably stress in shearing, during their deformation, at least one damping element 5.
• This damping element 5 is preferably housed inside the beam 1 or the edge of the beam 1.
• At least one damping element 5 is disposed between the connecting walls 4 and connects the latter between them.
• At least one damping element 5 constitutes the connection, in particular the joint plane, between two partitions, preferably overlapping, coming from the connecting walls 4 of the beam 1.
• At least one damping element 5 is disposed between incident surface 2 and radiating surface
• the damping element 5 can constitute the connection, in particular the joint plane, between two partitions, preferably overlapping, originating from the incident 2 and radiating 3 surfaces.
• connecting wall 4, incident 2 and radiating 3 surfaces and damping element 5 can define in section two open polygons joined by one of their sides to form in the assembled state a closed structure as shown in Figures 1, 2 and 4
• connecting wall 4, incident 2 and radiating 3 surfaces and damping element 5 define two open polygons joined by their small base (FIG. 2) or by their large base (FIGS. 1 and 4). for ⁇ form when assembled a closed structure.
• each elementary mesh is constituted by a damping device of the aforementioned type.
• the damper element can also affect a large number of shapes.
• this damping element consists of a viscoelastic material, such as a polymer based on acrylic or natural or synthetic elastomers, based on silicones, phosphazenes.
• this viscoelastic element is used as a joint plane between two overlapping partitions 6 coming from the connecting walls 4, the viscoelastic material is subjected essentially to shearing forces by the deformation of the beam or the edge of the beam.
• the damping element could also consist of an oleo-pneumatic member or a pneumatic member without departing from the scope of the invention.
• the beam 1 or rigid beam section 1 has been shown hollow. However, it could be filled with a viscoelastic material or any other damping device. Similarly, the section of this beam can be arbitrary from the moment when it has rigid deformable connecting walls under the effect of a vibrating wave applied to the incident surface of said beam as illustrated in all the figures.
• the beam 1 is a symmetrical structure in which the connecting walls are geometrically opposite walls.
• symmetry is not a mandatory feature of the invention.
• This damping device can be used in particular as an interposition element between a vibrating structure (not shown) and a support, said support having been shown in the figures by hatching.
• the applications of this device are numerous, in particular in the automotive field in place of or as a complement to rubber blocks and shock absorbers, in the naval field as a support or structure link in vibration (engine bridges, propeller shaft) in the field rail as support for railway sleepers, in rail structures and finally in the field of aviation for any support or rigid link.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Aviation & Aerospace Engineering (AREA)
• Mechanical Engineering (AREA)
• Vibration Prevention Devices (AREA)

Applications Claiming Priority (3)

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• 2000
  • 2000-05-31 FR FR0007050A patent/FR2809785B1/fr not_active Expired - Fee Related
• 2001
  • 2001-05-29 EP EP01940625A patent/EP1285182A1/de not_active Withdrawn
  • 2001-05-29 WO PCT/FR2001/001661 patent/WO2001092754A1/fr not_active Ceased
  • 2001-05-29 AU AU2001274144A patent/AU2001274144A1/en not_active Abandoned

Non-Patent Citations (1)

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