Scholarly
    Communications Project


Document Type:Master's Thesis
Name:Joel E. Lamendola
Email address:jlamendo@vt.edu
URN:1998/00715
Title:LIMIT CYCLE PIO ANALYSIS with SIMULTANEOUSLY ACTING MULTIPLE ASYMMETRIC SATURATION
Degree:Masters of Science
Department:Aerospace and Ocean Engineering
Committee Chair: Dr. Mark R. Anderson
Chair's email:anderson@aoe.vt.edu
Committee Members:Dr. Wayne Durham
Dr. Frederick Lutze
Keywords:Limit Cycle, PIO, Describing Function, Dual Input Descibing Function
Date of defense:May 14, 1998
Availability:Release the entire work immediately worldwide.

Abstract:

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.

List of Attached Files

back.pdf conclusion.pdf front.pdf
sec1_2.pdf sec3.pdf sec4_43.pdf


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