The Boeing Company

Deutsches Zentrum Fur Luft Und Raumfahrt Linder Hohe

Nord-micro Ag & Co. Ohg

Ulf Michel

Richard A Black

Yeu-chuan Hsia

Herbert Louis Hoffman

Martin Steinert

Naval Kishore Agarwal

Wendell R Miller

Pat D Parkin

Frederick R Helms

Wen-Hwang Lin

Roy Hai-Tien Loh

F Wayne Hollatz

Robert J Devitis

Frank Arnold

Wolfgang Neise

Peer Böhning

Yeu-Chuan Hsia

Wayne F Hollatz

An enclosed test stand may be enclosed by at least two reverberant boundary surfaces. Two of said at least two reverberant boundary surfaces may abut against each other to form an edge. A first linear array of microphones may be configured to detect acoustical signals of a sound field. The linear array of microphones may be arranged along the edge. An evaluating unit may be coupled to the linear array of microphones. The evaluating unit may be configured to locate sound sources of the sound field.

Device and method for acoustic source localization in a sound measurement testbed

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

Ulf Michel