Guest Speaker
Title: |
Flutter Suppression through Integrated Flight and Aeroelastic Controls |
 |
Speaker: |
Dr. Brian Holm-Hansen |
|
Affiliation: |
Office of Naval Research |
|
When: |
Friday, September 29, 2023 at 11:00:00 AM |
|
Where: |
Weber SST II Building, Room Classroom 2 |
|
Host: |
Anirban Mazumdar | |
Abstract Flutter is a destructive phenomenon caused by adverse interactions between inertial, elastic, and aerodynamic forces. Throughout history flutter has destroyed everything from bridges to aircraft. A team at Lockheed Martin Skunk Works developed a method for stabilizing multiple flutter modes in a highly flexible, unmanned flying wing. In a flying wing configuration, flutter margin requirements often force designers to use stiffness rather than load constraints, which can lead to heavier structures and reduced platform capabilities. The team used flight test experiments to demonstrate that they can accurately model flutter mechanisms and then use their models to design integrated flight and aeroelastic controls that expand an aircraft’s flight envelope by 66 percent. The first structural instability occurred when the wing bending and short period modes coupled to cause body freedom flutter (BFF). Both symmetric and anti-symmetric wing bending/torsion modes became unstable at higher speeds. Our controller successfully suppressed these three flutter modes and enabled flight at increased speeds that would have otherwise resulted in catastrophic destruction. Video evidence will be presented |
||
Biography Dr. Brian Holm-Hansen brings over 20 years of engineering and research experience in controls, test and experimentation in fields ranging from rail transportation to advanced aircraft. Since 2016 he has held the position of Flight Dynamics and Control Program Officer at the Office of Naval Research where he leads the development, award and execution of research projects to advance aviation capabilities for the United States Navy and Marine Corps. Dr. Holm-Hansen has built a portfolio of world-renowned investigators to conduct fundamental research in areas ranging from complex multi-body dynamics and control to undiscovered coupling mechanisms in human/machine systems. Driven by a forward-looking goal to transition basic research findings to broadly applicable Naval capabilities, Dr. Holm-Hansen formed a coalition of university investigators and government |
||