Accession Number : ADA325671

Title :   Shaped Actuators and Sensors for Local Control of Intelligent Structures.

Descriptive Note : Final rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : McCain, Amy J. ; Crawley, Edward F.

PDF Url : ADA325671

Report Date : 23 JAN 1997

Pagination or Media Count : 118

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. Finite element models are constructed which add damping, finite actuator thickness, and finite beam and actuator widths to the model. The actuator to sensor transfer functions are calculated to these models, and the effects of the added factors are determined. It is shown that the transfer 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.

Descriptors :   *TRANSFER FUNCTIONS, *FINITE ELEMENT ANALYSIS, *BEAMS(STRUCTURAL), *ACTUATORS, MATHEMATICAL MODELS, SHAPE, DAMPING, VIBRATION ISOLATORS, THREE DIMENSIONAL, DELAY.

Subject Categories : Electrical and Electronic Equipment
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE