USA As Represented by Secretary of the Navy

David J Daily

Jesse L Belden

Aren M Hellum

David N Beal

Simon E Freeman

William A Visser

Andrew N Guarendi

Jason R Morin

Sarah E McQueen

Lauren A Freeman

A planar sensor array includes a center tube, a first group of tubes, and a second group of tubes. One or more of the first group of tubes is positively buoyant, and at least one of the second group of tubes is negatively buoyant. Adjacent tubes are joined together by hinges. Acoustic sensors are positioned within the tubes. First and second half-shells are connected to the most distal tube of each group. The first half-shell is positively buoyant, and the second half-shell is negatively buoyant. An actuator attached to said center tube, and fins are attached to the actuator. The actuator is adjustable to change the fins angle of attack. Environmental fluid flow over the fins induces a torque on the actuator and center tube and causes these components to rotate. Rotation of the center tube causes the first and second groups of tubes to wrap around the center tube.

Rollable, large vertical aperture, acoustic planar towed array

There is provided a device for mitigating physical shock to an object to which it is attached. The device includes a body having a through-bore extending from one end to another. A sliding mass is positioned within the bore hole such that it can slide within the through-bore. A first end cap is slidingly disposed in said body hollow volume at one end of the body, and a second end cap is slidingly disposed at the other. End cap and body combination is filled with a liquid. Responsive to an impact along the body axis, one of the end caps is partially displaced into the body and at least a portion of the liquid changes phase from a liquid phase to a vapor phase.

Shock mitigation utilizing quiescent cavitation

A shock mitigator is provided for mitigating physical shock to a joined object. The shock mitigator includes a hollow body capable of being affixed to the object and having two ends defining a volume therein. A cavitating liquid is disposed in the hollow body volume. At least one end cap is slidingly disposed within the hollow body to seal at least one end thereof. When exposed to a physical shock the cavitating liquid changes phase from a liquid to a vapor, absorbing energy from the shock.

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Middletown, RI, United States of America

David J Daily