An Experimental Determination of the Effects of Blending Collocated and Non-Collocated Sensor Measurements to Control a Flexible Structure

Abstract

An experimental investigation was performed controlling a cantilevered beam in bending using proportional feedback on a blend of collocated and non-collocated sensor measurements using a single actuator. Exact transfer functions between the control input and the measurements were developed and compared to the finite element method. By analyzing the open loop pole-zero locations as a function of the measurement blending, insight into the closed loop behavior is obtained. Minimum phase behavior can be maintained for a range of the blending ratio. Results using blended control were compared to both proportional collocated feedback and compensated collocated feedback using LQG methods. The comparison was then extended to a theoretical investigation using the blended measurements on a free-free torsional model analogous to a gimbal. Advantages and limitations of using blended measurements are presented.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1992
Accession Number
ADA258823

Entities

People

  • Richard G. Cobb

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Abstracts
  • Actuators
  • Algorithms
  • Blending
  • Closed Loop Systems
  • Control Systems
  • Equations
  • Estimators
  • Feedback
  • Finite Element Analysis
  • Flexible Structures
  • Frequency Response
  • Modulus Of Elasticity
  • Physical Properties
  • Resonant Frequency
  • Spectrum Analyzers
  • Transfer Functions

Readers

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  • Structural Dynamics.