Fault detection and diagnosis in aerospace systems using analytical redundancy.pdf

Introduction
Problem statement and definitions
fault is an unexpected change
Ain a system, such as a
component malfunction and
variations in operating condition, that
tends to degrade overall system
performance. We use the term ‘fault’ and diagnosis in
rather than failure to denote a
malfunction rather than a
catastrophe. The term failure suggests
complete breakdown, while a fault
may denote something tolerable:
0 Why do we need fault detection?
-Early indication of incipient faults using analytical
can help avoid major plant
breakdowns and catastrophes.
-Fault detection and isolation has
e a critical issue in the redundancy
operation of high-integrity and
fault-tolerant systems, such as
used in aerospace applications.
0 Tasks of fault diagnosis
--Fault detection, . the indication
that something is going wrong in Performance requirements in aeronautics and the rapid growth of
the system. electronics, especially of puters, have gradually led to
-Fault isolation, . the
determination of the exact bination of advanced control theories and fly-by-wire
location of the fault. technology. This has resulted in designs for which the control
--Fault identification, . the systems are flitcritical. The required reliability is usually
determination of the size and achieved by a multiplication o