Title page for ETD etd-06102002-185506

Type of Document Master's Thesis
Author Pettersson, Henrik Bengt
Author's Email Address hpetters@vt.edu
URN etd-06102002-185506
Title Variable Stability Transfer Function Simulation
Degree Master of Science
Department Aerospace and Ocean Engineering
Advisory Committee
Advisor Name Title
Durham, Wayne C. Committee Chair
Lutze, Frederick H. Jr. Committee Member
Woolsey, Craig A. Committee Member
  • Flight Simulation
  • Transfer Functions
  • Model Following
  • Linearization
  • Variable Stability
Date of Defense 2002-06-06
Availability unrestricted
Simulation, whether in-flight or ground-based, is an invaluable tool for testing and

evaluating aircraft. Classically, a simulation model is specific to a single particular airframe,

only able to model those flying characteristics. Vast information can be gained from a

simulation that is able to model a wide range of aircraft, through a comparison of the

performance of these aircraft.

Such a variable stability simulation model was created based on 46 stability parame-ters,

including natural frequencies, damping ratios, time constants, and gains. The simula-tion

was obtained using transfer functions representing the aircraft state responses to control

inputs. These transfer functions were converted into state space systems used to create the

linear equations for the model.

The model was first developed as a desktop simulation and then converted for use

with the Virginia Tech’s 2F122A flight simulator. This conversion required a simple dynamic

inversion of the body axis force and moment terms. To reduce the error in these terms, a

model following scheme was incorporated.

A series of canned inputs and real-time pilot-in-the-loop tests were flown to evaluate

the variable stability model. Results in this paper have demonstrated the successful creation

of a variable stability simulation model.

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