Because of the growing interest in real-time stability monitoring, there is a need for online methods that can detect off-nominal behavior in control systems.Therefore, we present a realtime frequency domain method for detecting oscillations in control systems. The method uses recursive Fourier transform for representing the measured time-domain signal in frequency domain. Oscillations are then detected by monitoring the norm of the Fourier coefficients over a time window of prespecified size across a range of frequencies that represent offnominal behavior for the plant. The method is computationally efficient and requires little memory, and hence suitable for online application. The feasibility of using this method for a real-time detection of oscillation is demonstrated on the Georgia Tech Twinstar Unmanned Aerial System.
|Number of pages
|Journal of Aerospace Computing, Information and Communication
|Published - Feb 2011
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
- Computer Science Applications
- Electrical and Electronic Engineering