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1. EP3706115 - A NOISE DAMPER AND A METHOD FOR PRODUCING A NOISE DAMPER

Office European Patent Office
Application Number 19161670
Application Date 08.03.2019
Publication Number 3706115
Publication Date 09.09.2020
Publication Kind A1
IPC
G10K 11/165
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
162Selection of materials
165Particles in a matrix
E01B 19/00
EFIXED CONSTRUCTIONS
01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
19Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
CPC
E01B 19/003
EFIXED CONSTRUCTIONS
01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
19Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
003Means for reducing the development or propagation of noise
G10K 11/165
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
162Selection of materials
165Particles in a matrix
Applicants TRELLEBORG RETFORD LTD
Inventors BRINDLE PHILIP WAYNE
WILLIAMS ANDREW
DAUDIA RAJIV
Designated States
Priority Data 19161670 08.03.2019 EP
Title
(DE) GERÄUSCHDÄMPFER UND VERFAHREN ZUR HERSTELLUNG EINES GERÄUSCHDÄMPFERS
(EN) A NOISE DAMPER AND A METHOD FOR PRODUCING A NOISE DAMPER
(FR) AMORTISSEUR DE BRUIT ET PROCÉDÉ DE PRODUCTION D'UN AMORTISSEUR DE BRUIT
Abstract
(EN)
A noise damper for reducing noise from a vibrating element which vibrates at a vibrational frequency, wherein the noise damper is configured to be in contact with the vibrating element such that when the noise damper is in contact with the vibrating element a noise amplitude at a point in a surrounding of the vibrating element is given by an attenuation factor times the noise amplitude at the point in the surrounding when the noise damper is disconnected from the vibrating element, the noise damper comprising:a polymer matrix, the polymer matrix being in a solid phase and forming a shape;a plurality of hollow particles dispersed in the polymer matrix,each hollow particle having a shell encapsulating a gas filled cavity,each hollow particle having a hollow particle size, andthe plurality of hollow particles being dispersed at a hollow particle concentration in the polymer matrix;wherein the hollow particle size and the hollow particle concentration are configured to set the attenuation factor below an attenuation factor threshold at the vibrational frequency of the vibrating element, the hollow particle size being in a range wherein the largest dimension is between 20 µm and 2000 µm.

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