Accession Number : ADD018450

Title :   Smart Actuator for Active Surface Control.

Descriptive Note : Patent, Filed 31 Aug 95, patented 25 Feb 97,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Corsaro, Robert D

Report Date : 25 Feb 1997

Pagination or Media Count : 7

Abstract : The present invention is a controllable surface based upon a 1:3 piezoelectric composite (sometimes referred to as a 1-3 composite or a 1/3 composite). The 1:3 piezoelectric composite has a first planar electrode plate, a first plurality of piezoelectric rods fixed to and extending normally from the first planar electrode plate, a second plurality of piezoelectric rods fixed to and extending normally from the first planar electrode plate, and a second planar electrode plate, coupled to the first plurality of piezoelectric rods and decoupled from the second plurality of piezoelectric rods, essentially parallel to and opposing the first planar electrode plate. The first plurality of piezoelectric rods act as actuators, and urge the first planar electrode plate in a direction normal to said plate in response to an actuator signal (applied as a bias between the two planar electrode plates). The second plurality of piezoelectric rods act as accelerometers, and generate an accelerometer signal in response to an accelerating force acting upon the first planar electrode plate. The controllable surface also includes an accelerometer mass, fixed to the second plurality of piezoelectric rods, for providing inertial mass to the second plurality of piezoelectric rods.

Descriptors :   *ELECTRODES, *PIEZOELECTRIC MATERIALS, *PATENTS, ACCELEROMETERS, COMPOSITE STRUCTURES, SURFACE ACTIVE SUBSTANCES, ACTUATORS, PIEZOELECTRIC EFFECT

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE