Frequency domain method for real-time detection of oscillations

Girish Chowdhary, Sriram Srinivasan, Eric Johnson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


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 real-time 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 pre-specified size across a range of frequencies that represent off-nominal behavior for the plant. This method is computationally efficient and requires limited memory, hence it can be used for onboard health monitoring of Unmanned Aerial Systems (UAS). Consequently, we demonstrate the feasibility of using this method for real-time detection of oscillation on the Georgia Tech GT Twinstar (UAS).

Original languageEnglish (US)
Title of host publicationAIAA Infotech at Aerospace 2010
StatePublished - Dec 16 2010
EventAIAA Infotech at Aerospace 2010 - Atlanta, GA, United States
Duration: Apr 20 2010Apr 22 2010

Publication series

NameAIAA Infotech at Aerospace 2010


OtherAIAA Infotech at Aerospace 2010
Country/TerritoryUnited States
CityAtlanta, GA

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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