The Boeing Company

Rolls-royce Deutschland Ltd & Co. Kg

Nord-micro Ag & Co. Ohg

Frank Arnold

Richard A Black

Alastair D Moore

Yeu-chuan Hsia

Herbert Louis Hoffman

Marco Rose

Martin Steinert

Wendell R Miller

Naval Kishore Agarwal

Wolfgang Neise

Fredi Holste

Pat D Parkin

Frederick R Helms

Ulf Michel

Wen-Hwang Lin

Roy Hai-Tien Loh

F Wayne Hollatz

Robert J Devitis

Yeu-Chuan Hsia

Wayne F Hollatz

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 () provided in a flow duct () flown by a fluid at which vortices () 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 () 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.

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

A valve is provided for controlling a flow of a fluid between a first environment and a second environment. The valve includes a frame adapted to fit within a perimeter of an aperture in a divider separating the first environment from the second environment. The valve additionally includes a first gate movable within the frame to control a flow of the fluid through the aperture between the first environment and the second environment. The first gate includes a substantially aerodynamically clean surface substantially free from protrusions disrupting the flow of the fluid over the first gate surface. Additionally, the first gate includes a trailing edge having a baffle adapted to cover an aft edge of the frame when the first gate is positioned to have a small opening angle. The baffle includes a plurality of 3-D notches in a front side of the baffle. The valve further includes a second gate movable within the frame to control a flow of the fluid through the aperture between the first environment and the second environment. The second gate also includes a substantially aerodynamically clean surface substantially free from protrusions disrupting the flow of the fluid over the second gate surface. Additionally, the second gate includes a trailing edge comprising a plurality of 3-D notches in a front side of the trailing edge.

Fluid control valve

Growing community of inventors

Berlin, Germany

Frank Arnold