Type of Document Master's Thesis Author Pettersson, Henrik Bengt Author's Email Address firstname.lastname@example.org 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 Keywords
- Flight Simulation
- Transfer Functions
- Model Following
- Variable Stability
Date of Defense 2002-06-06 Availability unrestricted AbstractSimulation, 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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