Non-Parametric Estimation of Uncertain Closed-Loop Multivariate Frequency Response for Stability Assurance
2022-03
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Non-Parametric Estimation of Uncertain Closed-Loop Multivariate Frequency Response for Stability Assurance
Authors
Published Date
2022-03
Publisher
Type
Thesis or Dissertation
Abstract
System identification of closed-loop, multivariate systems presents a complex challenge; the use case for this study is on estimation for the purpose of stability margin assurance. Assessing both the nominal, or "best", estimated stability margins and the uncertainty range of those estimates are critical. This challenge is addressed by subjecting the system to multisine excitations and evaluating the response at both the excited frequencies and a set of null frequencies that are interleaved with the excited frequencies. This unique form of frequency separation allows for isolation of the response due to disturbances; which provides a critical source of estimation uncertainty. Additional sources of uncertainty, arising from response variations with time and spectral leakage, are combined to form a total estimated uncertainty. The impact of nonlinearities in the response are addressed, along with a particular approach to identification of nonlinearities. System stability assessment is performed, that directly accounts for estimation uncertainty. The approach to system estimation and stability assessment requires minimal prior knowledge and relies on only in situ data; the result is an independent assurance of system stability.
Description
University of Minnesota Ph.D. dissertation. 2022. Major: Aerospace Engineering and Mechanics. Advisor: Peter Seiler. 1 computer file (PDF); 154 pages.
Related to
Replaces
License
Collections
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Regan, Christopher. (2022). Non-Parametric Estimation of Uncertain Closed-Loop Multivariate Frequency Response for Stability Assurance. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/241305.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.