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The Initialization Response of Multi-Term Linear Fractional-Order Systems With Constant History Functions

[+] Author Affiliations
Tom T. Hartley

University of Akron, Akron, OH

Carl F. Lorenzo

NASA Glenn Research Center, Cleveland, OH

Paper No. DETC2011-48016, pp. 339-351; 13 pages
  • ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 3: 2011 ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications, Parts A and B
  • Washington, DC, USA, August 28–31, 2011
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5480-8
  • Copyright © 2011 by ASME


In this paper, the distinction between an operator’s historical initial condition function, the consequential initialization function of the operator, and the resulting initialization response of an entire system, is discussed. The single term and two-term differential equation results with constant history functions from earlier studies are reviewed. A three-term linear fractional-order differential equation with constant history function is studied next. This system is solved by using the proper Laplace transforms for the fractional-order derivatives. The paper then presents the initialization responses for multi-term linear fractional-order systems with commensurate orders that have had arbitrarily-long constant displacements in negative time. Results for short-times and for long-times are provided. These results are obtained by using the proper Laplace transform for the fractional-order derivatives. Using the results of this paper, the initialization response of any linear, commensurate-order, fractional-order system, with arbitrarily-long constant displacements in negative time can be determined.

Copyright © 2011 by ASME
Topics: Functions



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