Accession Number : ADD015712

Title :   Articulated Fin/Wing Control System.

Descriptive Note : Patent, Filed 8 Nov 91, patented 16 Feb 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Beauchamp, Charles H ; Cincotta, Manuel, Jr ; Raffa, Anthony V ; Gauthier, Benoit G

Report Date : 16 Feb 1993

Pagination or Media Count : 9

Abstract : An articulated control surface is provided for hydrodynamic control utilizing a moldable control surface. The central surface is shaped by contracting and elongating wire bundles fabricated with shape-memory alloys located in an adjacent cooling chamber. The shape-memory alloys contract when heated via an applied electric current and elongate when cooled, i.e., the electric current is removed. A pair of wire bundles is anchored inside the cooling chamber. Each bundle is routed over several pulleys in such a manner that a lateral movement is produced at the actuator end of the wire. A pair of bundles act in opposition to maintain dynamic tension at the actuator end. Cooling flow to opposing wire bundles is controlled independently to enhance response time and reduce power requirements. The actuator is a post extending from the cooling chamber to the trailing edge structure of the control surface.

Descriptors :   *CONTROL SURFACES, *HYDRODYNAMICS, *PATENTS, ACTUATORS, BUNDLES, CHAMBERS, DYNAMICS, ELECTRIC CURRENT, FLOW, HOISTS, POWER, REQUIREMENTS, STRUCTURES, SURFACES, TENSION, TRAILING EDGES, WIRE

Subject Categories : Fluid Mechanics
      Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE