Lockheed Martin Corporation

Eliot Goldstein

Robert James Howard

Nicholas John Nagurny

John Walter Rapp

Michael R Eller

Leslie David Kramer

Derek Matthew Beckner

Natalie B Levings

Randy J Brown

Matthew Herbek

Jared D Gilbert

Patrick D Grandelli

Gordon Briggs

Joe Van Ryzin

John Gornowich

Nicole Anderson

Austin Lu

Jennifer Dolson

Ariel Brown

A heat exchanger and a method for fabricating the heat exchanger are disclosed. The heat exchanger comprises a heat exchanger core that is formed from a plurality of stacked aluminum panels that are joined together via friction stir welding. Each panel in the core is formed from at least two aluminum extrusions that are joined to one another via friction stir welding.

Heat exchanger

An embodiment of a device for generating an acoustic signal in a fluid includes an engine operable to repeat a thermodynamic process to vibrate a membrane of the engine to generate an acoustic signal having more than one period. The thermodynamic process includes heating mass inside a chamber of an engine to generate pressure inside the chamber; in response to generating the pressure, moving in a first direction a portion of a membrane of the engine; removing mass from inside the chamber to decrease the pressure inside the chamber; and in response to decreasing the pressure inside the chamber, moving the membrane portion in a second direction. In an embodiment, because the engine repeats the thermodynamic process, the engine can generate and sustain an acoustic signal for a significant amount of time.

Engine and technique for generating an acoustic signal

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Fairfax Station, VA, United States of America

Eliot Goldstein