Accession Number : ADA290201

Title :   Integrated Intelligent Structures for Suppressing Static Aerothermoelastic Deformation and Flutter of Panels.

Descriptive Note : Final rept. 1 Jul-31 Dec 93,

Corporate Author : C AND C TECHNOLOGIES INC NORFOLK VA

Personal Author(s) : Chu, Li-Chuan

PDF Url : ADA290201

Report Date : FEB 1994

Pagination or Media Count : 29

Abstract : This document presents nonlinear panel flutter suppression study which has been accomplished by using both the finite element method and the classical continuum method. The results show that: (1) The bending moment is more effective than inplane force in active suppression using piezoelectric actuation. (2) The critical flutter dynamic pressure can be increased two to three times for the cases studied (3) With embedded shape memory alloy (SMA) fibers, the critical buckling temperature of the composite panel is increased 10 to 20 times that of the panel with no SMA, and the static aerothermoelastic deformation is eliminated. (4) Flutter stability region is enlarged significantly with SMA. (5) Panel flutter suppression for integrated composite structures can be achieved effectively by using piezoelectric materials at low temperatures and SMA at high temperatures.

Descriptors :   *PIEZOELECTRIC MATERIALS, *FLUTTER, *AIRCRAFT PANELS, *AEROTHERMOELASTICITY, AERODYNAMIC STABILITY, FINITE ELEMENT ANALYSIS, DEFORMATION, SHAPE, STRUCTURES, COMPOSITE STRUCTURES, ALLOYS, CRITICAL TEMPERATURE, BUCKLING, EMBEDDING, STATICS, DYNAMIC PRESSURE, ACTUATION, SUPPRESSION, BENDING MOMENTS.

Subject Categories : Aerodynamics
      Containers and Packaging

Distribution Statement : APPROVED FOR PUBLIC RELEASE