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Fluidic element structure body for controlling noise and vibration, and control method thereof

A technology of jet components and structures, which is applied in the field of structures, can solve problems such as inapplicability of broadband sound waves, and achieve the effect of saving space

Inactive Publication Date: 2005-03-09
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

this system works well for attenuating the periodic sound pressure produced by rotating propellers, but is not suitable for attenuating the broadband sound waves produced by jet engines or the aerodynamic boundary layer of aircraft

Method used

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  • Fluidic element structure body for controlling noise and vibration, and control method thereof
  • Fluidic element structure body for controlling noise and vibration, and control method thereof
  • Fluidic element structure body for controlling noise and vibration, and control method thereof

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Embodiment Construction

[0043] The present invention provides a structure capable of actively controlling the acoustic impedance, which is formed by a stack of laminated sheets arranged in an array. Preferably each slice in the array contains fluidic elements or conductive elements between fluidic elements. Some of the fluidic elements are fluidic amplifiers which are preferably connected in series. The input to the in-line amplifier can be from the side facing the noisy environment and excited by the sound wave, or toward the side of the object emitting the sound wave that needs to be controlled. The structure also receives a fluid that is modulated at the inlet to generate a certain amount of "nechoic sound waves" or sound waves that are out of phase with the sound waves being directed. Its effect is to actively control the acoustic impedance to cancel the sound waves, or to reduce the sound radiation emitted by the vibrating body (such as the aircraft cabin wall) covered by the structure.

[004...

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Abstract

Fluidic constructs, including grouped stacks of fluidic elements, that provide countersound to control sound in a noisy environment, prevent radiation of sound from vibrating surfaces, reduce sound-induced vibration of surfaces, and absorb sound that might otherwise impact on surfaces, are provided. These constructs may have a wide range of geometries for specific applications, but generally include a face plate on one side, and a back plate on the other side. Supply ports on the back plate provide a supply of fluid that flows through the construct, while undergoing acoustic modulation through fluidic amplifiers. The face plate includes input ports that sense sound waves to be controlled. While output ports creats sound out of phase with the sound sensed by the input ports to substantially counteract noisy sound waves.

Description

technical field [0001] The present invention relates to the field of noise attenuation and proposes a structure comprising fluidic elements capable of controlling the impedance of the structure in order to attenuate sound waves over a wide frequency band. Background technique [0002] Various noise attenuation techniques have been developed, including, for example, the use of passive mufflers, which are used in the exhaust systems of automobiles. Other techniques include the use of noise-absorbing enclosures around noisy devices and the use of sound-absorbing materials to reduce acoustic reverberation in the environment. In addition, active noise reduction technology that neutralizes noise waves by generating "neutralizing sound waves" has proven successful. For example, an active noise reduction system formed by connecting a system that uses a microphone for noise detection (the microphone is powered by a power supply) to a system that uses a speaker to generate cancellati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02K1/34G10K11/175
Inventor 安德斯·O·安德森
Owner THE BOEING CO