Model-based Fault Diagnosis Techniques: Design Schemes, by Steven X. Ding

By Steven X. Ding

A most important and significant factor surrounding the layout of automated keep watch over platforms with the successively expanding complexity is making certain a excessive method functionality over a large working diversity and assembly the necessities on approach reliability and dependability. As one of many key applied sciences for the matter suggestions, complicated fault detection and id (FDI) know-how is receiving substantial consciousness.

The target of this booklet is to introduce easy model-based FDI schemes, complicated research and layout algorithms and the wanted mathematical and regulate concept instruments at a degree for graduate scholars and researchers in addition to for engineers.

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Define the loop current LD and the armature frequency as state variables, the terminal voltage XD as input 32 3 Modelling of technical systems Fig. 1. 1 Parameters of laboratory DC motor DR300 Parameter Symbol Value Total Inertia M 62=75 Voltage constant F 6=27 · 1033 Motor constant NP 0=06 Armature Inductance OD 0=003 Resistance UD 3=13 Tacho output voltage NW 5 · 1033 Tacho filter time constant WW 5 Unit Y @Xsp Y @Xsp [email protected] K Rkp Y @Xsp pv Models of DC motor control system For the purpose of speed control, cascade control scheme is adopted with a speed control loop and a current control loop.

In order to give a unified definition which is valid both for additive and multiplicative faults, we first specify our intension of introducing the concept of structural fault detectability. First, structural fault detectability should be understood as a structural property of the system under consideration, which describes how a fault affects the system behavior. It should be expressed independent of the system input variables, disturbances as well as model uncertainties. Secondly, fault 52 4 Structural fault detectability, isolability and identifiability detectability should indicate if a fault would cause changes in the system output.

Note that this open loop model is identical with the one introduced in the last section. In practice, it is often the case that x is not available. For instance, if the control loop is a part of a large scaled system and located remotely from the supervision station, where the higher level controller and FDI unit are located, the reference signal z> instead of process input signal x, is usually available for the FDI purpose. 7 Benchmark examples 31 be applied. The closed loop FDI strategy is based on the closed loop model with z and | as input and output signals respectively.

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