US2009078519A1PendingUtilityA1
Vibration damping device
Est. expiryMar 31, 2025(expired)· nominal 20-yr term from priority
F16F 15/005F16F 7/1028F16F 7/10
45
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Claims
Abstract
The damping device comprises a cluster of resonators with a predetermined frequency distribution, that, when attached to a main or “master” structure, is capable of absorbing irreversibly its vibrational or/and acoustic energy produced by a vi 5 brating body. the density of natural frequencies of the plurality of resonators is comprised within a curve that lies below the envelope curve determined by the formula, e( )=1/−1.
Claims
exact text as granted — not AI-modified1 . Vibration damping device for damping vibrations of a vibrating or oscillating entity, e.g. a body or a structure or a gas mass, adapted to be connected to the vibrating entity,
the vibrating entity defining at least one respective natural frequency (ω M ),
the damping device comprises a predetermined plurality (N) of resonators,
the plurality (N) of resonators have respective natural frequencies (ω N ), with values close to a curve determined by a first formula
δ
opt
/
N
=
1
2
π
exp
{
-
1
2
[
(
σ
/
r
)
-
(
I
/
r
)
]
2
}
(
σ
/
r
)
Ω
,
σ
/
r
=
m
ω
M
3
r
Ω
3
sin
Ω
(
ω
M
t
0
)
where mω M 3 /r, I/r and t 0 =π(4ω M ) are the parameters defining the first formula,
the density of natural frequencies of the plurality of resonators is comprised within a curve that lies below the envelope curve determined by a second formula,
e (Ω)=1/|Ω−1|
where Ω=ω N /ω M is a nondimensional frequency.
2 . Damping device according to claim 1 wherein the value of mω M 3 /r is comprised in the range from 2 to 20.
3 . Damping device according to claim 1 wherein the value of I/r is comprised in the range from 0.94 to 14.
4 . Device according to claim 1 , wherein the resonators are five or more.
5 . Device according to claim 1 , wherein the resonators are fixed to an own support structure.
6 . Device according to claim 1 , wherein there are provided means for adjusting the natural frequency of the resonators.
7 . Device according to claim 6 , wherein the resonators comprise electromechanical circuits.
8 . Device according to claim 6 wherein the resonators comprise acoustic ducts.
9 . Device according to claim 6 , wherein the resonators comprise solid masses.
10 . Device according to claim 9 , wherein the solid masses are shaped as beams.
11 . A body or structure made at least partially of a micro-structured material incorporating one or more damping devices according to claim 1 .
12 . A body or structure according to claim 12 wherein the damping devices are arranged according to a matrix and are fixed to the microstructured material.
13 . A system for recovering wave energy incorporating the damping device according to claim 1 .
14 . A system for damping vibrations in floating vessels incorporating the damping device according to claim 1 .
15 . A system for damping vibrations in buildings incorporating the damping device according to claim 1 .Join the waitlist — get patent alerts
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