Non-linear dynamic absorber and use thereof for acoustic insulation

Patent metadata

Field	Value
Publication number	US-10738464-B2
Application number	US-201515517190-A
Country	US
Kind code	B2
Filing date	Oct 7, 2015
Priority date	Oct 9, 2014
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A building element includes a sheet of a rigid material and at least one nonlinear energy sink including a blade with two end parts and a nonlinear spring function intermediate part, a mass fixed to the nonlinear spring function intermediate part of the blade, and a fixing element allowing the two end parts of the blade to be fixed to a solid support in such a way that the nonlinear spring function intermediate part can oscillate about its position of equilibrium or its positions of equilibrium. The nonlinear energy sink is fixed rigidly to the sheet by the fixing element. The building element can be contained in a partition wall. Additionally, such an energy sink or building element can be used for reducing the acoustic transparency of a wall.

First claim

The invention claimed is:

1. A building element to be subjected to vibrations, comprising:
at least one sheet of a rigid material and at least one nonlinear energy sink comprising
a blade with two end parts and a nonlinear spring function intermediate part,
a mass fixed to the nonlinear spring function intermediate part of the blade, and
a fixing means allowing the two end parts of the blade to be fixed within a solid support in such a way that the nonlinear spring function intermediate part can oscillate about its position of equilibrium or its positions of equilibrium,

the nonlinear energy sink being fixed rigidly to the sheet by the fixing means,
wherein the blade is subjected to a compressive stress from being fixed to the solid support that causes elastic buckling of the blade before the blade is subjected to the vibrations.

2. The building element as claimed in claim 1 , wherein the elastic buckling is less than 10%, this percentage being expressed with respect to a length of the nonlinear spring function intermediate part.

3. The building element as claimed in claim 1 , wherein the mass is fixed in a central part of the nonlinear spring function intermediate part of the blade.

4. The building element as claimed in claim 1 , wherein the blade is a metal blade.

5. The building element as claimed in claim 1 , wherein the fixing means consists of a single piece comprising two built-in means for rendering the end parts of the blade fixed.

6. The building element as claimed in claim 5 , wherein the fixing means comprises two branches extending symmetrically from a common base, the two built-in means being situated respectively on the two branches.

7. The building element as claimed in claim 6 , wherein the two built-in means are situated respectively at or near an end of each of the branches.

8. The building element as claimed in claim 1 , wherein the nonlinear energy sink is fixed to the sheet in such a way that a plane of the blade of the sink is substantially parallel to a plane of the sheet.

9. The building element as claimed in claim 1 , wherein the at least one sheet is a sheet of plasterboard.

10. The building element as claimed in claim 1 , wherein the at least one sheet of the building element comprises two sheets that are parallel to one another and separated by an intermediate space.

11. The building element as claimed in claim 10 , wherein the two sheets are sheets of plasterboard.

12. The building element as claimed in claim 11 , wherein an intermediate space between the two sheets is filled with an acoustic insulation material.

13. The building element as claimed in claim 10 , wherein an intermediate space between the two sheets is filled with an acoustic insulation material.

14. The building element as claimed in claim 1 , wherein the building element is configured to reduce an acoustic transparency of a wall.

15. The building element as claimed in claim 1 , wherein the nonlinear spring function intermediate part is longer than a distance separating the solid support in which the two end parts of the blade are fixed to subject the blade to the compressive stress before the blade is subjected to the vibrations.

16. A wall of a building comprising:
the building element as claimed in claim 1 .

Assignees

• Saint Gobain Placo
• Saint Gobain Isover
• Centre Nat Rech Scient

Inventors

• Mattei Pierre-Olivier
• Bellizzi Sergio
• Pachebat Marc
• Poncot Remi
• Berger Sylvain

Classifications

• G10K11/172

  using resonance effects · CPC title

• G10K11/16

  Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) · CPC title

• F16F15/022

  using dampers and springs in combination · CPC title

• F16F7/116

  on metal springs · CPC title

• E04B2/7409 Primary

  special measures for sound or thermal insulation, including fire protection · CPC title