USA As Represented by Secretary of the Navy

Joseph J Stace

Marilyn Wun-Fogle

James B Restorff

Ivan N Kirschner

Peter Finkel

Ahmed H Amin

Laurence M Dean

Colin J Murphy

An energy harvesting device for harvesting energy from a moving structure includes a housing allowing transmission of magnetic fields therethrough. A piezoelectric material capable of a phase transition and a magnetostrictive material capable of a structural change when subjected to a magnetic field are mechanically coupled to each other in the housing. An adjustable pre-stress means is positioned between the housing and the combination of the piezoelectric and magnetostrictive materials. Electrical contacts are positioned on the piezoelectric material. A magnet is mounted on the moving structure. The housing is mounted in sufficient proximity to the magnet for the magnetic field of the magnet to induce the structural change in the magnetostrictive material.

Magnetoelectric energy harvesting

A sealing apparatus which may be mounted on multi or single barreled guns disclosed to provide a watertight seal on an underwater gun. The sealing apparatus comprises a sealing plate connected to a gun barrel and a muzzle seal which fit on the muzzle of the gun barrel and frictionally engages the sealing plate. The sealing plate includes a firing aperture which aligns with the gun barrel when the gun is fired.

Sealing apparatus for exclusion of water from underwater gun barrels

Growing community of inventors

Narragansett, RI, United States of America

Joseph J Stace