Actuator/sensor modeling for integrated structural control
This report summarizes work performed at LLNL on actuator/sensor modeling for integrated structural control. There are four sections and three attachments in the report: Section 1 illustrates the need to integrate actuator/sensor models with the structural dynamics model in structural control design. Section 2 introduces a generic SBL model, called the Pajaro Problem, developed at LLNL for examining the model integration issues. Section 3 outlines the procedures for integrating the actuator and sensor models with the structural model. Section 4 describes a model reduction procedure which produces directly a reduced order structural controller, by passing the reduction of the integrated actuator-structure dynamic model. Through the model integration exercise conducted in this work, a number of conclusions can be made. We have demonstrated that an integrated modeling approach is essential to structural control. With the Pajaro Problem, we have developed the dynamic models for the support structure, the slewing actuators, the mirror actuators, and a sensor model to characterize the optical ray trace. These models are integrated to form a dynamic model with actuator commands as the inputs and variables characterizing the exiting rays of the optical train as outputs. We have also demonstrated that the use of a high level matrix-oriented language facilitated the systematic handlings of matrix expressions and linear state space equations. The dynamic analysis and control design work reported herein however required additional programming in FORTRAN. The LLNL EAGLES/Controls or other similar commercial computer-aided control system design packages which allow similar high level matrix manipulations as well as performing dynamic analysis and control design would be a candidate software tool for the development of integrated structural control. 3 refs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7122864
- Report Number(s):
- UCID-21457; ON: DE88014698
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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