Advertisement

Models from Identification

  • Wodek Gawronski
Part of the Mechanical Engineering Series book series (MES)

This chapter describes the process of deriving the velocity loop model from field test data. It includes the description of the white noise testing of an antenna, test conditions, input and output signals, open- and closed-loop testing, the instrumentation set-up, and the system identification test. Analytical background for the data description and data processing are also included. Next, the dependency of the antenna model on its elevation position, and on the dish diameter is discussed. Finally, analytical and identified models are compared.

White Noise Testing of the Antenna

The white noise signal is applied at the input of the velocity loop to excite the antenna dynamic, and the antenna reaction is measured at the encoder. The white noise is a random signal of even spectrum within the antenna bandwidth; hence each frequency component of the antenna dynamics is excited evenly. It should guarantee to obtain a meaningful transfer function and trustworthy model of the velocity loop.

Pu...

Keywords

Transfer Function Power Spectral Density Function Elevation Position Loop Transfer Function Position Loop 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Bendat, JS, Piersol AG. (1986). Random Data. John Wiley, New York.Google Scholar
  2. 2.
    Gawronski W. (2004). Advanced Structural Dynamics and Active Control of Structures. Springer, New York.CrossRefGoogle Scholar
  3. 3.
    Juang JN. (1994). Applied System Identification, Prentice-Hall, Englewood Cliffs, NJ.Google Scholar
  4. 4.
    Juang JN, Horta LG, Phan M. (1992). System/observer/controller identification toolbox. NASA Tech Memo 107566.Google Scholar
  5. 5.
    Landau ID. (2001). Identification in closed loop: a powerful design tool (better design models, simpler controllers). Control Engineering Practice 9: 51–65.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Wodek Gawronski
    • 1
  1. 1.Jet Populsion LaboratoryCalifornia Institute of TechnologyPasedenaUSA

Personalised recommendations