Lockheed Martin Corporation

Foster-miller, Inc.

Trevor J Owen

Michael R Eller

Nicholas John Nagurny

Scott Morris Maurer

Derek Matthew Beckner

Eugene Charles Jansen

Randy J Brown

Michael Zatman

Duy N Pham

Kevin Patrick Miller

A process of producing shell and tube heat exchangers where the ends of the tubes are secured to a tube sheet while reacting applied FSW forces without introducing a crevice or local deformation near the ends of the tubes. In particular, an interference fit is used to lock the ends of the tubes into the tube sheet without flaring or expanding the tube ends. A FSW process is then used to weld the ends of the tubes to the tube sheet.

Process of friction stir welding on tube end joints and a product produced thereby

Enclosures are described that encapsulate or surround a joint between two or more elements, for example two pipes or a pipe and a valve. The enclosures prevent direct contact between the joint and the surrounding water, for example fresh or salt water, and prevent biofouling and corrosion of the joint. An enclosure encapsulates the joint and forms an enclosed space around the joint. Some or all of the enclosure includes a flexible material. The enclosed space is filled with a protective liquid that is retained in the enclosed space and that will be in direct contact with the joint. Due to the flexible nature of the flexible material, the pressure inside the enclosed space is maintained substantially equal to the exterior pressure outside the membrane.

Pressure compensated enclosures for submerged joints

Fluid conveying pipes and processes of forming such pipes using friction stir welding. The fluid conveying pipes are formed from a pipe section that includes a first barrel coaxially and concentrically disposed within a second barrel. The first barrel and the second barrel are each formed from one or more sections or plates where longitudinal extending facing edges of the plates are friction stir welded (FSW) together along a seam(s) that extends longitudinally from the first end to the second end thereof. A plurality of the pipe sections can be connected together end to end using circumferential FSW seams to form a pipe.

Friction stir welded pipes

Array amplitude modulation which includes mapping a data symbol to a phase modulation signal and an amplitude modulation signal for transmission from antenna elements; applying the phase modulation signal to the antenna element amplifiers; and generating a pattern of enabling/disabling the antenna element amplifiers as a function of the amplitude modulation to produce a phase and amplitude modulated transmission from the antenna elements.

Array amplitude modulation system and method

Growing community of inventors

Vienna, VA, United States of America

Trevor J Owen