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1. (WO1985004688) IMPROVEMENTS IN OR RELATING TO NOISE SILENCING SYSTEMS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1985/004688 International Application No.: PCT/GB1985/000139
Publication Date: 24.10.1985 International Filing Date: 02.04.1985
IPC:
F01N 1/10 (2006.01) ,F01N 1/24 (2006.01) ,F02B 1/04 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
N
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
1
Silencing apparatus characterised by method of silencing
08
by reducing exhaust energy by throttling or whirling
10
in combination with sound-absorbing materials
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
N
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
1
Silencing apparatus characterised by method of silencing
24
by using sound-absorbing materials
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02
COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
B
INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
1
Engines characterised by fuel-air mixture compression
02
with positive ignition
04
with fuel-air mixture admission into cylinder
Applicants:
YOUNG, Robert, Eric [GB/GB]; GB
Inventors:
YOUNG, Robert, Eric; GB
Priority Data:
840974414.04.1984GB
Title (EN) IMPROVEMENTS IN OR RELATING TO NOISE SILENCING SYSTEMS
(FR) AMELIORATIONS A DES SYSTEMES DE SILENCIEUX
Abstract:
(EN) These noise silencing systems are applied to the silencing of noise developed in fluids, that is either in a gas as exemplified by a jet engine exhaust or in a liquid such as in a hydraulic power transmission system. The configuration of the silencer assemblies is of the shunt chamber type which provides a straight-through path for the working fluid and, with arrangements including energy absorbing terminations (4), an aperiodic (non frequency-dependent) silencing action. The fresh concepts involved are based on new, largely schematic level, analogies developed in relation to electric transmission line and waveguide. This is in contrast to the approach adopted for the filter type of silencer, which is the basic alternative to the shunt chamber type, and which is frequency dependent and introduces appreciable loss.
(FR) Les systèmes de silencieux ci-décrits s'appliquent à la suppression du bruit se développant dans un fluide, que ce soit un gaz, comme par exemple l'échappement d'un moteur à réaction, ou un liquide, comme par exemple dans un système de transmission de puissance hydraulique. La configuration des silencieux est du type à chambre de dérivation, permettant d'obtenir un chemin droit de traversée pour le fluide de travail et, grâce à des agencements comprenant des terminaisons absorbant l'énergie (4), une action de silencieux apériodique (indépendante de la fréquence). Les concepts nouveaux appliqués reposent, à un niveau largement schématique, sur des analogies développées en rapport aux lignes de transmission électriques et aux guides d'ondes. Cette approche est en contraste avec celle adoptée dans les silencieux du type à filtre, qui représentent l'alternative fondamentale aux silencieux à chambre de dérivation, et qui dépendent de la fréquence tout en introduisant des pertes appréciables.
Designated States: AU, JP, US
European Patent Office (AT, BE, CH, DE, FR, GB, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0176541US4785909AU1985041197