David A Erickson

US Patent:

7005779, Feb 28, 2006

Filed:

Jun 8, 2004

Appl. No.:

10/863018

Inventors:

David J. Erickson - Liverpool NY, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01L 41/08

US Classification:

310328

Abstract:

An efficient generator of electrical power employs groups of piezoelectric devices disposed in a radial manner about a centrally located cam. The cam, when rotated by a prime mover as a conventional source of mechanical energy, applies a periodic varying force to each piezoelectric device in a suitable sequence. The devices operate to respond to the rotation of the cam by having a cam follower coupled to each device via a spring, whereby a periodically varying force is applied to each piezoelectric device according to the cam surface and based on the rotation of the cam. Each device produces an output voltage according to the force applied to the device via the cam and the coupling between the device and the cam surface. Each device includes a stack of low loss piezoelectric plates connected together and responsive to the application of a mechanical stress to the stack to produce an electrical output.

US Patent:

7398690, Jul 15, 2008

Filed:

Apr 7, 2006

Appl. No.:

11/400688

Inventors:

David J. Erickson - Liverpool NY, US
Walter Chyrywaty, III - Liverpool NY, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

G01L 11/00

US Classification:

73702

Abstract:

An acoustic pressure sensor includes a stack of one or more acoustically responsive elements which are contained within a housing. An external acoustic pressure to be sensed is transmitted to the stack via a diaphragm which exists in an end cap closing a top portion of the housing. The outer edge of the diaphragm is in direct contact with the outer edge of the housing. This area enhancement increases the basic sensitivity of the sensing stack without the need of a gap. The diaphragm allows flexure to occur in a controlled fashion. The housing is sealed at the top and bottom by end caps, the top end cap defining a diaphragm area, which diaphragm deflects to thereby apply pressure to the stack to convert acoustic signals into electrical signals.

US Patent:

7466066, Dec 16, 2008

Filed:

Nov 7, 2005

Appl. No.:

11/268089

Inventors:

Raymond Porzio - Lafayette NY, US
David J. Erickson - Liverpool NY, US
Todd C. Gloo - Liverpool NY, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01L 41/04
H01L 41/083

US Classification:

310334, 310328, 31032321

Abstract:

A longitudinally driven slotted transducer has a tubular member with an axial slot extending from one end to the other end. A drive assembly is disposed across the inner wall of the tubular member and supported by journal bearing surfaces extending from opposing sides of the inner wall to locate the drive assembly in a position offset from the longitudinal central axis of the tubular member. The interface between the drive assembly and tubular member comprises a layer of solid lubricant material mounted on the journal bearing type surfaces.

US Patent:

7673831, Mar 9, 2010

Filed:

Jun 8, 2006

Appl. No.:

11/422933

Inventors:

Daniel W. Steele - Clay NY, US
John H. Goodemote - Oneida NY, US
David J. Erickson - Liverpool NY, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

B64C 39/02

US Classification:

244 1TD

Abstract:

Embodiments of the invention are directed to an unmanned air vehicle (UAV) system and a small unmanned air vehicle (SUAV) system for deploying and towing a sensor in a tow medium, and to methods related thereto. A UAV-sensor towing package comprises a fixed-wing UAV including a control and signal processing platform, a long range data RF link operably connected to the control and signal processing platform, a UAV wireless data link operably connected to the control and signal processing platform, and a tow body deployment system operably connected to the control and signal processing platform; a tow line attached at an end thereof to the UAV; a tow body attached to another end of the tow line; and a communications link including a transmitter/receiver component coupled to the tow line, and a T/R wireless data transmission link () operably connected with the transmitter/receiver component and the UAV wireless data link.

US Patent:

7679266, Mar 16, 2010

Filed:

Oct 31, 2008

Appl. No.:

12/262367

Inventors:

Raymond Porzio - Lafayette NY, US
David J. Erickson - Liverpool NY, US
Todd C. Gloo - Liverpool NY, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01L 41/08

US Classification:

31032302

Abstract:

A transducer comprises a longitudinal tubular member symmetrically disposed about a central longitudinal axis, the tubular member having a slot extending from the front end of said member to the rear end of the member, the slot extending parallel to the central longitudinal axis; a stack comprising a single element or plurality of vibratory elements arranged from a first to a second end and; a mounting arrangement for mounting the said stack across the inner wall of said tubular member on a line relatively transverse to said longitudinal central axis. The mounting arrangement includes a layer of solid lubricant engaging opposite ends of the stack, enabling the stack to move in a direction of the central axis when the stack exhibits vibratory motion.

US Patent:

7889601, Feb 15, 2011

Filed:

Jun 19, 2007

Appl. No.:

11/820379

Inventors:

John H. Goodmote - Oneida NY, US
Dane E. Reiner - Liverpool NY, US
David J. Erickson - Liverpool NY, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H04R 17/00

US Classification:

367176, 367153, 367162

Abstract:

An acoustic transducer array and method of baffle construction is presented to provide an improved array for use in underwater installations. The array is presented wherein a significant majority of the acoustic energy receiving surface is formed by lightweight acoustic baffling material while still maintaining a fully functional, fully populated array. The acoustic baffle constructed is incompressible and suitable for deep water operation while demonstrating both improved acoustic performance and positive buoyancy when necessary. In addition, the invention eliminates the non-uniform element to element spacing that occurs between sub-panels in similar arrays.

US Patent:

52375439, Aug 17, 1993

Filed:

Apr 16, 1992

Appl. No.:

7/870733

Inventors:

David J. Erickson - Liverpool NY
Robert T. Winnicki - Marcellus NY
Louis M. Izzo - Fayetteville NY

Assignee:

General Electric Company - Syracuse NY

International Classification:

H04V 1700

US Classification:

367157

Abstract:

A transducer includes an acoustic radiating member for generating acoustic energy in a transmitting medium and a driver member that is pivotally connected to the radiating member. The driver member is for urging movement of the radiating member, wherein such movement generates the energy. Pivoting of the driver member with respect to the radiating member relieves predetermined stress in the driver member. The radiating member may include, for example, a flat element such as a bar, plate or disk, or an I-shaped element. The driver element may include an electroactive material. The driver element may be connected to the radiating element by support apparatus that is fixedly coupled to the radiating element includes a screw having a predeterminedly contoured end that engages a complimentarily contoured recess connected to the driver element for permitting the pivoting. When the support apparatus includes a screw it may be adjusted for supplying a predetermined force on the driver element.

US Patent:

56040105, Feb 18, 1997

Filed:

Jan 11, 1996

Appl. No.:

8/587160

Inventors:

Dale E. Hartz - Seattle WA
David G. Erickson - Seattle WA
William B. Hopkins - Seattle WA
Christopher L. Pederson - Seattle WA

International Classification:

B32B 312

US Classification:

428118

Abstract:

Resin flow into the cells of a honeycomb core in sandwich structures is eliminated by using an unsupported film adhesive, a barrier layer, and a scrim supported adhesive layer between the composite laminate and the core. Superior panels with lighter weights, improved mechanical properties, and more predictable structural performance result by keeping resin in the laminate rather than losing it to the core cells.