Title page for ETD etd-51298-145137

Type of Document Master's Thesis
Author Lamendola, Joel E.
Author's Email Address jlamendo@vt.edu
URN etd-51298-145137
Title Limit Cycle PIO Analysis With Simultaneously Acting Multiple Asymmetric Saturation
Degree Master of Science
Department Aerospace and Ocean Engineering
Advisory Committee
Advisor Name Title
Anderson, Mark R. Committee Chair
Durham, Wayne C. Committee Member
Lutze, Frederick H. Jr. Committee Member
  • Limit Cycle
  • PIO
  • Describing Function
  • Dual Input Descibing Function
Date of Defense 1998-05-14
Availability unrestricted
Pilot in-the-loop oscillation (PIO) is a phenomenon which occurs due to the dynamic interaction between pilot and aircraft. This detrimental aircraft handling quality appears through a variety of flight conditions and is very difficult to predict. Due to this complex behavior, PIO is not easily eliminated. This report describes a method of PIO analysis that is capable of examining multiple asymmetric nonlinearities acting simultaneously. PIO analyses are performed on a model based on the USAF NT-33A variable stability aircraft with nonlinearities including stick position limiting, elevator deflection limiting, and elevator rate limiting. These analyses involve the use of dual input describing functions which enable the prediction of frequency, amplitude, and mean point of oscillation.
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  back.pdf 126.02 Kb 00:00:35 00:00:18 00:00:15 00:00:07 < 00:00:01
  conclusion.pdf 56.40 Kb 00:00:15 00:00:08 00:00:07 00:00:03 < 00:00:01
  front.pdf 82.03 Kb 00:00:22 00:00:11 00:00:10 00:00:05 < 00:00:01
  sec1_2.pdf 76.52 Kb 00:00:21 00:00:10 00:00:09 00:00:04 < 00:00:01
  sec3.pdf 199.91 Kb 00:00:55 00:00:28 00:00:24 00:00:12 00:00:01
  sec4_43.pdf 199.16 Kb 00:00:55 00:00:28 00:00:24 00:00:12 00:00:01

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