Masters Theses

Abstract

"Today's systems are getting more complex with a significant number of variables to be monitored for information processing to aid in fault diagnosis and prognosis. Centralized diagnosis and prognosis schemes are not preferred for such complex systems as they lead to delayed or missed alarms and possibly catastropic [sic] failures. Instead, this thesis addresses a decentralized fault diagnosis and prognosis scheme both in continuous and discrete-time for nonlinear complex systems which can be divided into smaller subsystems. Such complex systems are referred to as a large-scale interconnected nonlinear system. This thesis is presented in the form of two papers first for nonlinear continuous-time systems and then for nonlinear discrete-time systems.

In this work, each subsystem is monitored by a Local Fault Detector (LFD) or observer, which consists of an adaptive online approximator to compensate the fault dynamics arising from local and non-local faults. Due to the interconnection nature of the system, the non-local faults propagate to other subsystems degrading the overall performance of the entire system. First faults are detected by generating a residual from the LFD and local subsystem states and comparing it against a predefined threshold. Upon detection, the faults are isolated as local or non-local to a particular subsystem. Subsequently, time to failure (or remaining useful life) information is computed by using state measurements local to that subsystem. Simulation results are provided to demonstrate the effectiveness of the proposed control design"--Abstract, page iv.

Advisor(s)

Sarangapani, Jagannathan, 1965-

Committee Member(s)

Zawodniok, Maciej Jan, 1975-
Acar, Levent

Department(s)

Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2012

Journal article titles appearing in thesis/dissertation

  • Decentralized fault detection and prediction scheme for nonlinear interconnected continuous-time systems
  • Decentralized fault prognosis scheme for nonlinear interconnected discrete-time systems

Pagination

xi, 86 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2012 Deepthi Shreeya Lathamaheswari Raja, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Boeing 747 (Jet transports)Airplanes -- Control systems -- TestingFault location (Engineering)ActuatorsInterconnects (Integrated circuit technology)

Thesis Number

T 10120

Print OCLC #

842929905

Electronic OCLC #

908768017

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