Accession Number : ADA188824

Title :   Active Vibration Control of a Cantilevered Beam with Three Elastic Coordinates.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Cristler, Thomas A

PDF Url : ADA188824

Report Date : Dec 1987

Pagination or Media Count : 194

Abstract : Many control methods have been proposed for dealing with the large space structure vibration control problem. To experimentally evaluate these various approaches in a way which will allow consistent comparison of results requires a baseline experiment in which all variables are understood and controlled. From this baseline, the various aspects of each control scheme can be implemented and their relative merits compared on a consistent basis. This experiment was implemented using a vertically suspended cantilever beam with rectangular cross section. Proof mass structure. Closed loop control was formulated using linear quadratic regulator theory and results are compared with simulation and eigenvalue predictions to establish baseline performance. Modal suppression techniques were implemented to demonstrate control of selected modes while maintaining overall system stability. Results applicable to future testing and development in the large space structure control area are identified. Keywords: Vibrations, Controls.

Descriptors :   *CANTILEVER BEAMS, *VIBRATION, BASE LINES, CLOSED LOOP SYSTEMS, CONTROL, COORDINATES, CROSS SECTIONS, EIGENVALUES, ELASTIC PROPERTIES, LINEAR SYSTEMS, MASS, QUADRATIC PROGRAMMING, RECTANGULAR BODIES, REGULATORS, SIMULATION, STABILITY, SUPPRESSION, THEORY, VARIABLES, MATHEMATICAL PREDICTION, TRANSFER FUNCTIONS, THESES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE