Accession Number : ADA298574
Title : Shaped Actuators and Sensors for Local Control of Intelligent Structures,
Descriptive Note : Master's thesis,
Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
Personal Author(s) : McCain, Amy J.
PDF Url : ADA298574
Report Date : JUN 1995
Pagination or Media Count : 121
Abstract : The properties of the actuator to sensor transfer functions for various shaped strain actuator-sensor pairs on a Bernoulli-Euler beam are investigated. Analytical expressions for these transfer functions and their associated dereverberated transfer functions are derived. It is shown that the actuator-sensor pair can be designed such that its dereverberated transfer function will have a desirable corner frequency and high frequency rolloff rate. The analytical and dereverberated transfer functions of noncollocated actuator-sensor pairs are compared to those of the collocated pairs. General rules are found which determine the frequency at which the transfer function no longer has an inter-laced pole-zero pattern. Finite element models are constructed which add damping, finite actuator thick- ness, and finite beam and actuator widths to the model. The actuator to sensor transfer functions are calculated for these models, and the effects of the added factors are determined. It is shown that the transverse bending modes of the three dimensional beam delay the rolloff of the actuator to sensor frequency transfer function by at least two decades. Finally, experimental data confirms the results of the three dimensional finite element model. (AN)
Descriptors : *MATHEMATICAL MODELS, *TRANSFER FUNCTIONS, *FINITE ELEMENT ANALYSIS, *STRUCTURAL MECHANICS, VIBRATION, TWO DIMENSIONAL, DAMPING, THESES, MOMENTS, STRAIN(MECHANICS), BENDING, THREE DIMENSIONAL, TRANSVERSE WAVES, ACTUATORS, CONTROL THEORY, REVERBERATION, TRAVELING WAVES, FLEXIBLE STRUCTURES, ANALYTIC FUNCTIONS, CANTILEVER BEAMS, EULER ANGLES, BERNOULLI DISTRIBUTION.
Subject Categories : Operations Research
Distribution Statement : APPROVED FOR PUBLIC RELEASE