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Active Control by Conservation of Energy ConceptThree unrelated experiments are discussed; each was extremely sensitive to initial conditions. The initial conditions are the beginnings of the origins of the information that nonlinearity displays. Initial conditions make the phenomenon unstable and unpredictable. With the knowledge of the initial conditions, active control requires far less power than that present in the system response. The first experiment is on the control of shocks from an axisymmetric supersonic jet; the second, control of a nonlinear panel response forced by turbulent boundary layer and sound; the third, control of subharmonic and harmonics of a panel forced by sound. In all three experiments, control is achieved by redistribution of periodic energy response such that the energy is nearly preserved from a previous uncontrolled state. This type of active control improves the performance of the system being controlled.
Document ID
20000033626
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Maestrello, Lucio (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Aircraft Stability And Control
Report/Patent Number
AIAA Paper 2000-2045
Meeting Information
Meeting: 6th Aeroacoustics Conference
Location: Lahaina, HI
Country: United States
Start Date: June 12, 2000
End Date: June 14, 2000
Sponsors: National Oceanic and Atmospheric Administration, American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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