STANFORD UNIVERSITY
EE 350 RADIOSCIENCE SEMINAR
Professor Leonard Tyler
Autumn 2002-2003

Date: Wednesday, October 9, 2002
Time: 4:15-5:30 PM; Refreshments at 4:00 PM
Location: Bldg. TCSeq, Rm. 101

Nonstationary Processes in Oscillatory Systems

Professor Mark Koepke

Department of Physics, West Virginia University

Abstract

Time-varying driving force amplitude, driving-force frequency, system mass, or system rigidity can result in nonstationary behavior in an oscillatory system. A brief overview of the linear and nonlinear treatment of this problem will be presented and the relevant nonlinear dynamics will be emphasized. Specific examples of frequency chirping in a driven, nonlinear, electronic oscillator will be presented. The distinction between stationary and nonstationary regimes will be made clear. Cases of high-Q and low-Q oscillatory systems will be discussed. Applications to plasma physics and industry will be mentioned.