Accession Number : ADA293761

Title :   Finite Element Analysis of Smart Structures and Modal Testing of A Flexible Spacecraft Arm.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Trump, James C.

PDF Url : ADA293761

Report Date : DEC 1994

Pagination or Media Count : 58

Abstract : This thesis deals with analytical predictions and experimental determination of the modal frequencies and shapes associated with the arm portion of the Naval Postgraduate School's Flexible Spacecraft Simulator (FSS). A description of how piezoceramic sensors and actuators are incorporated in finite element modeling is presented. A MATLAB(TM) code conducting the finite element modeling of the arm is used to verify the modal frequencies generated via Structural Dynamic Research Corporation's I-DEAS(TM) software. Modal testing is conducted with the I-DEAS Test package to determine the first four physical modal frequencies and shapes so that we may compare them with the analytical results. The results of the testing indicated that finite element analysis predicted modes one and three within an average of 23.1%, and modes two and four within an average of 4.4%. (AN)

Descriptors :   *MATHEMATICAL MODELS, *FINITE ELEMENT ANALYSIS, *FLEXIBLE STRUCTURES, TEST AND EVALUATION, SIGNAL PROCESSING, SIMULATORS, DIGITAL SYSTEMS, VIBRATION, SPACECRAFT, LOADS(FORCES), STRUCTURAL MECHANICS, COMPARISON, DAMPING, THESES, CERAMIC MATERIALS, RESONANT FREQUENCY, MATHEMATICAL PREDICTION, PIEZOELECTRIC MATERIALS, ACTUATORS, DYNAMIC PROGRAMMING.

Subject Categories : Operations Research
      Mechanics
      Astronautics

Distribution Statement : APPROVED FOR PUBLIC RELEASE