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SPACE PATENTS BY
Aerospace Assignees
Aerospace Inventors
Time Lines

Arrangement for the generation of sonic fields of a specific modal composition

Invented by: Marco Rose
Freiberg, DE

Fredi Holste
Berlin, DE

Frank Arnold
Berlin, DE

Alastair D Moore
Derby, GB

Originally Assigned to: Roll-Royce Deutschland Ltd & Co KG
Blankenfelde-Mahlow, DE
[Now assigned to . . .]

Issued:2009-04-14
Filed:2005-03-02
Application No:11068980
Examined by:Benson; Walter

A device for simulating sound produced by certain equipment, for example a rotor-stator arrangement of a turbomachine, or for generation of opposing sound fields for active sound control, including active sound reduction and active sound amplification, comprises flow obstacles (2) provided in a flow duct (1) flown by a fluid at which vortices (5, 6) are shed at a certain frequency depending on the shape and size of the flow obstacles and the velocity of flow. The quantity and spatial arrangement of the flow obstacles is selected such that a periodically spatially and temporally changing pressure field for the excitation of a sound field (8) of a certain modal content is produced by the entirety of the vortices shed. This sound field reacts synchronizingly on the vortex shedding. The resonant circuit so formed, whose vortex shedding frequency is in the range of the resonant frequency of the sound field to be excited, is the sound source.

[pdf] U.S. Pat. No. 7,516,815

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This information is part of a study by Oasis Global, Inc. of all space inventions filed at the United States Patent and Trademark Office, and is provided for informational purposes only. It is not an endorsement of any particular assignee, inventor or invention. Although Peter A. Koziol represents inventors and assignees of space inventions he does not represent all of the inventors and assignees listed. The prosecuting attorney agent or firm for each patent is identified by the United States Patent and Trademark Office in the patent specfication, which can be viewed by clicking on the patent image or downloading the patent document. For more information regarding Mr. Koziol's background and experience, or to learn more about space inventions, please contact Mr. Koziol.

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