Device for the acoustic insulation of a motor vehicle glazing
A device for soundproofing a plate, includes a soundproofing part and a mounting part, wherein the mounting part is to be mounted secured to a border of the plate, the mounting part being mounted secured to the soundproofing part and having a second thickness h 2 in contact with the soundproofing part, and the soundproofing part is made of a first material, and extends along a first length l in a first main direction, the soundproofing part having a first thickness h 1 of the first material in a direction perpendicular to the first main direction the first thickness h 1 varying, based on an x coordinate, along the first length l, proportionally to a value of x n , wherein n is a real number strictly greater than 1, from a minimal thickness h 1min until h 2 , the first length l being so that h 1min , is less than or equal to one third of h 2 .
1 . A device for soundproofing a plate, comprising:
a soundproofing part, and
a mounting part, wherein
the mounting part is configured to be mounted secured to a border of the plate, the mounting part being mounted secured to the soundproofing part and having a second thickness h 2 in contact with the soundproofing part,
the soundproofing part is made of a first material, and extends along a first length l in a first main direction,
the soundproofing part having a first thickness h 1 of the first material in a direction perpendicular to the first main direction,
the first thickness h 1 varying, based on an x coordinate, along the first length I, proportionally to a value of x n , wherein n is a real number strictly greater than 1, from a minimal thickness h 1min until the second thickness h 2 , the first length l being predetermined so that the minimal thickness h 1min is less than or equal to one third of the second thickness h 2 .
2 . The device according to claim 1 , comprising a side border, wherein the soundproofing part forms a thinning of the device from the mounting part until the side border.
3 . The device according to claim 1 , wherein the soundproofing part has at least one recess in the first material.
4 . The device according to claim 1 , comprising a visco-elastic dissipator, wherein the visco-elastic dissipator is mounted secured in contact with at least one part of the soundproofing part, the visco-elastic dissipator being made of a material having a first loss factor η 1 strictly greater than 0.05.
5 . The device according to claim 1 , wherein the mounting part forms a housing able to receive a border of the plate.
6 . An assembly comprising a device according to claim 1 , and a plate having a border, wherein the mounting part is mounted secured to the border of the plate such that the soundproofing part is positioned opposite the plate and extends away from the mounting part in the first main direction.
7 . The assembly according to claim 6 , wherein the first material has a real part of the first Young's modulus E′ 1 , a first density ρ 1 , and a first Poisson's ratio v 1 , and wherein the mounting part has a first component γ 1 of phase velocity of a bending wave defined by
γ
1
=
(
E
′
1
h
2
2
1
2
ρ
1
(
1
-
v
1
2
)
)
1
4
and wherein the plate has a third thickness h 3 , a real part of the second Young's modulus E′ 2 , a second density ρ 2 and a second Poisson's ratio v 2 , defining a second component γ 2 of phase velocity of a bending wave defined by
γ
2
=
(
E
′
2
h
3
2
1
2
ρ
2
(
1
-
v
2
2
)
)
1
4
and wherein a difference between the first component γ 1 and between the second component γ 2 is less than 20% of the second component γ 2 .
8 . The assembly according to claim 6 , wherein the plate is a glazing.
9 . The assembly according to claim 8 , wherein the glazing comprises at least one mineral glass sheet.
10 . The assembly according to claim 9 , wherein the glazing is a laminated glazing.
11 . The assembly according to claim 7 , wherein the plate is a glazing comprising a mineral glass sheet, and wherein the first material of the device comprises aluminum, the second thickness h 2 being equal to the third thickness h 3 .
12 . The assembly according to claim 7 , wherein the plate is a glazing comprising a mineral glass sheet, and wherein the first material of the device comprises a polymer material, the second thickness h 2 being strictly greater than the third thickness h 3 .
13 . A method for manufacturing an assembly comprising a device according to claim 1 , and a plate having a border, the method comprising securing the mounting part to a border of the plate such that the soundproofing part is positioned opposite the plate and extends away from the mounting part in the first main direction.
14 . The device according to claim 2 , wherein n is a real number greater than or equal to 2.
15 . The device according to claim 3 , wherein n is a real number greater than or equal to 5/3.
16 . The device according to claim 3 , wherein a cut-out is formed at a center of the recess.
17 . The device according to claim 4 , wherein the first loss factor η 1 is strictly greater than 0.10.
18 . The device according to claim 17 , wherein the first loss factor η 1 is strictly greater than 0.15.
19 . The assembly according to claim 7 , wherein the difference between the first component γ 1 and between the second component γ 2 is less than 10% of the second component γ 2 .
20 . A device for soundproofing a plate, comprising:
a soundproofing part, and
a mounting part, wherein
the mounting part is configured to be mounted secured to a border of the plate, the mounting part being mounted secured to the soundproofing part such that, when the mounting part is mounted secured to the border of the plate, the soundproofing part is positioned opposite the plate and extends away from the mounting part in a first main direction, the mounting part having a second thickness h 2 in a direction perpendicular to the first main direction in contact with the soundproofing part,
the soundproofing part is made of a first material, and has a first length l in the first main direction,
the soundproofing part having a first thickness h 1 of the first material in the direction perpendicular to the first main direction,
the first thickness h 1 varying, based on an x coordinate in the first main direction, along the first length l, proportionally to a value of x n , wherein n is a real number strictly greater than 1, from a minimal thickness h 1min at the x coordinate of zero until the second thickness h 2 at the x coordinate of l of the first length, the first length l being predetermined so that the minimal thickness h 1min is less than or equal to one third of the second thickness h 2 .