Multiple Fault Isolation Research Articles

Robust Design of a Fault Diagnostic System for a Supersonic Wind Tunnel

By using the unknown input decoupling technique, this paper presents a robust fault detection and isolation (FDI) system design for a supersonic wind tunnel. A decoupled fault/residual map is designed in the sensor FDI system to achieve multiple fault isolation for principal sensors. Since the relations between actuator faults and the generated residuals are insignificant, a decoupled fault/residual map for actuator is not achievable. Nevertheless, based on the fault specific directions, single fault isolation can still be achieved for actuators with the proposed FDI system.

Robust Fault Detection and Isolation with Unstructured Uncertainty Using Eigenstructure Assignment

A numerical implementation is presented for the eigenstructure assignment approach to the design of a robust fault detection and isolation observer. By formulating the problem of multiple fault isolation in an eigenstructure, wedevelopaparametriccharacterizationofallallowableeigenspaces,whichprovidesadiagnosticobservercapable ofmultiplefaultisolation.Inaddition,awell-conditioneddesignoftheallowableeigenvectorsisshowntoreducethe effectofthesystem unstructured uncertainty.Theresulting diagnosticobserverisrobustto unstructuredmodeling errorswithoutlosingfaultdetectionsensitivity.Aprocedureforthesynthesisofareduced-orderdiagnosticobserver is also presented to increase the computational efe ciency of the proposed observer.

Isolation of Multiplicative Faults in the Industrial Actuator Benchmark

This paper presents an approach to the problem of fault isolation applied to the actuator benchmark test based on multiplicative fault isolation with parity equations. One of the problems of this benchmark is relative to the isolation of a multiplicative fault from additive disturbances. The fact that a fault can be modelled as multiplicative is used to isolate it from additive disturbances. An optimization procedure gets the most suitable residuals for multiplicative fault isolation.

Gas Path Analysis Applied to Turbine Engine Condition Monitoring

An approach is presented to turbine engine gas path analysis and monitoring, which permits the isolation of single or simultaneous multiple engine faults, with a quantitative assessment of their relative' severity. The software approach is described, showing features of its mathematical development and thermodynamic justification. Measureable engine parameters are treated as dependent variables, changes in which are mathematically interrelated to changes in component performance brought about by physical engine faults. Typical results are presented from real programs, wherein engine data were analyzed to provide meaningful and verified diagnoses of single and multiple engine faults.