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Experimentally Identifying the Transfer Function of an Electromechanical System

[+] Author Affiliations
Richard A. Layton, Clifford Grigg

Rose-Hulman Institute of Technology, Terre Haute, IN

Paper No. IMECE2002-32061, pp. 993-999; 7 pages
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Dynamic Systems and Control
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 0-7918-3629-0 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME


An experiment is developed in which the instructor demonstrates the acquisition of frequency response data for an electromechanical system (an X-Y recorder). Students are given copies of the acquired data, from which they create an amplitude response plot and develop a transfer function for the system. Using a simple optimization routine, students tweak the model until the predicted amplitude response most closely matches the experimental data. The model is refined further by adding a zero to the transfer function. Students compare the predictions of their models to the experimental data and answer related questions on a lab worksheet, all within one three-hour lab period. In this paper, the apparatus, demonstration, data reduction, system identification, and results are described. A videotaped demonstration of the experiment, sample data, and the lab handout and worksheet are available online at www.rose-hulman.edu/ES205/labs.html. In future work, the experiment will be modified to measure phase response.

Copyright © 2002 by ASME



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