Frequency Domain Approaches to Fault Detection in Closed-Loop Systems

Cheng, Joseph Hurk-Ning (1986) Frequency Domain Approaches to Fault Detection in Closed-Loop Systems. MSc(R) thesis, University of Glasgow.

Abstract

This thesis describes fault detection techniques which can be applied to closed-loop automatic control systems. Particular emphasis is placed upon frequency domain methods. Digital simulation is used for the evaluation of on-line techniques for fault detection using pseudo-random-binary test signals. This simulation work involves a simple process model based on a two tank liquid flow control system. Frequency-domain identification using pseudo-random-binary test signals is performed by means of a mixed radix-2 fast Fourier transformation technique. This technique avoids the synchronisation problems which arise when the more conventional radix-2 transformation is used with pseudo-random binary test signals. A novel method of parameter sensitivity analysis is investigated both in terms of the identification of faults and for system optimisation following fault occurrence.

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Keywords: Electrical engineering
• Date of Award: 1986
• Depositing User: Enlighten Team
• Unique ID: glathesis:1986-77351
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 14 Jan 2020 09:11
• Last Modified: 14 Jan 2020 09:11
• URI: http://theses.gla.ac.uk/id/eprint/77351