A porous sound absorbing structure (10) capable of suppressing the lowering of sound absorbing performance in a wide frequency band, comprising an external plate (1) and a closing plate (2). Also, an internal plate (3) is disposed between the external plate (1) and the closing plate (2) through air layers (4) and (5), and the external plate (1), the internal plate (3), and the closing plate (2) are disposed oppositely to each other. A large number of through holes (1a) and (3a) are formed in the external plate (1) and the internal plate (2). The internal plate (3) is set so that a plate thickness t2 and the diameter D2 and opening rate β2 of the through holes (3a) can have viscous effect on the air flowing in the through holes (3a). The opening rate β1 of the through holes (1a) in the external plate (1) is set to more than 3% to 50%.

Porous sound absorbing structure

A variety of open-air noise cancellation systems are disclosed. The systems are configured to suit the needs of the particular application, for example, a sound wall installation, a seat or chair headrest application, a patio umbrella installation, or a window/door treatment application. A particular system may utilize an analog-based or a digital-based processing architecture that receives a noise signal, processes an out-of-phase noise cancellation signal, and generates an out-of-phase sound wave that effectively cancels the noise signal.

Open-air noise cancellation for diffraction control applications

A noise reduction system for a jet engine including a tubular exhaust shroud affixed to the engine through which engine exhaust gases pass, porous acoustical lining affixed to a substantial portion of the internal circumferential surface of the shroud, a chamber in contact with the acoustical lining outer surface and a controllable source of air pressure affixed to the chamber to control the passage of air through the acoustical lining to thereby vary the acoustical absorption properties of the lining.

Jet engine noise reduction system

A flexible sound shielding curtain contains a plurality of sound insulating sheet inserts encased within pockets or otherwise secured on the exterior surfaces of the panels of a curtain The sound insulating sheet inserts may be constructed of a combination of materials selected and configured such that sound impinging upon the curtain is absorbed or alternatively reflected The sound shielding curtain can be tuned to insulate an area from a select range of frequencies inherent in select environments Tuning may be accomplished through the selection and installation of sound insulating sheet inserts configured to reflect or absorb audible acoustical energy The sound insulating sheet inserts are readily removable to permit periodic laundering of the curtain fabric and to provide adaptability for a number of applications Sound shielding curtain(s) can be selected, configured, installed, and extended in such a manner as to provide sound reduction in a localized space The sound shielding curtain(s) may also be configured with a view window by replacing a portion of one or more sound insulating sheets with an acoustically hard transparent material The acoustically hard material may also comprise a panel of controllable privacy film

Apparatus and method for reducing noise levels

A sound absorbing structure is constituted of a housing having a hollow portion and an opening and a vibration member composed of a board or diaphragm. The vibration member is a square-shaped material having elasticity composed of a synthetic resin and is bonded to the opening of the housing, thus forming an air layer closed inside the sound absorbing structure by the housing and the vibration member. In the sound absorbing structure, when the lateral/longitudinal dimensions of the air layer and characteristics of the vibration member (e.g. a Young's modulus, thickness, and Poisson's ratio) are set such that the fundamental frequency of a vibration occurring in a bending system falls within 5% and 65% of the resonance frequency of a spring-mass system, a vibration mode having a large amplitude occurs in a frequency band lower than the resonance frequency of the spring-mass system, this improving the sound absorption coefficient.

Sound absorbing structure and vehicle component having sound absorbing property

A sound absorbing structure utilizes the vibration of a plate-like body (1), and includes the plate-like body (1), a vibration damping member (2) provided on at least one surface of the plate-like body (1), and an installation portion (3) provided at an opposite side of the vibration damping member against the plate-like body (1).

Sound absorbing structure

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Sound absorbing structure