Noise suppression systems

• Main Authors: ADAMS, AMY, PAIROLERO, NICHOLAS T, BAUMANN, TODD A, LE ROY, TYLER W, SNYDER, DALE D
• Format: Patent
• Language: English; French; German
• Published: 15.04.2015
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; BLASTING; BUILDING; CEILINGS; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; FIXED CONSTRUCTIONS; FLOORS; FLUSHING VALVES THEREFOR; GENERAL BUILDING CONSTRUCTIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INSULATION OR OTHER PROTECTION OF BUILDINGS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; NON-POSITIVE DISPLACEMENT PUMPS; PHYSICS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROOFS; SEWERAGE; SINKS; SOUND-PRODUCING DEVICES; WALLS, e.g. PARTITIONS; WATER SUPPLY; WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; WEAPONS

An apparatus or system includes a component that generates or transfers noise having a frequency within a noise frequency range. The component may include a boundary. The apparatus or system may be an engine in some examples. The engine may additionally include a micro-perforated sheet positioned a distance from the boundary. The micro-perforated sheet may include a plurality of micro-perforated holes, and may be configured to absorb sound within an absorption frequency range based on parameters of the micro-perforated sheet. The parameters may include the distance from the boundary and dimensions of the micro-perforated holes, and may be set such that the absorption frequency range overlaps the noise frequency range.