Jared M. Rupp

Date of Award


Document Type


Degree Name

Master of Science in Aeronautical Engineering


Department of Aeronautics and Astronautics

First Advisor

Richard G. Cobb, PhD.


Buffet Adaptively Managed Fin (BAMF) focused on vibrations due to the interaction of aerodynamic forces with aircraft structure. Past failures of F-16 ventral fins due to vibrations provided grounds for control research. The fin used had piezoelectric patches as collocated sensors/actuators. A custom amplifier and transformer were restructured into a system that could safely and reliably run, and adaptive software was created to address issues of system plant changes. Generating a PSD from the fin sensors, the highest peaks were assumed to represent the low damped vibration modes. A PPF controller for each mode was designed and control signals were sent to the fin actuators. Limited data were collected in a wind tunnel behind a custom system that caused buffet by varying vortex strength/shedding frequencies from pods upstream of the fin. While minimal testing was accomplished to optimize gains, the system showed significant PSD peak reductions for the first three modes of the fin up to -14.9, -15.3, and -16.4 dB, respectively. The system maintained stability and effective control even when both sensor input and controller output were saturated.

AFIT Designator


DTIC Accession Number