A Comparative Study of Analog and Digital Control Laws for the UWCSL Truss
Abstract
This thesis is based on research conducted at the University of Washington Department of Aeronautics and Astronautics Control Systems Laboratory (UWCSL). The UWCSL 20-bay planar truss is a replica of an experimental testbed at the United States Air Force Academy. Validation and modification of existing finite element models of the truss and the two primary means of structurally- borne actuation, the air jet thrusters and the reaction mass actuators, was accomplished and is discussed. Verification of classical analog controllers to actively suppress vibration of the planar bending modes of the truss using the air jet thruster and reaction mass actuators in independent and in hybrid configurations is reported in this thesis. The discretization and digitization of the classical control law was accomplished and the results of computer simulation, linear and non-linear, and experimental testing are reported. A comparison of the performance of the analog and the digital control laws is reported. The design of an optimal controller for the reaction mass actuators utilizing Linear Quadratic (LQ) techniques is reported, and includes non-linear simulation. Simulation of hybrid actuation utilizing the optimal reaction mass actuator control law and the classical air jet thruster controllers is also reported. Recommendations for future study based upon both the hardware implementation and the computer simulation are suggested in the conclusions of this thesis.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1992
- Accession Number
- ADA267980
Entities
People
- Anthony M. Mitchell
Organizations
- Air Force Institute of Technology