Fuzzy Logic Based Modeling in the Complex System Fault Diagnosis

There is no doubt that related to safety-critical systems such as chemical plants, nuclear reactors, space shuttles and aircrafts, the issues of reliability, operating safety and environmental protection are of major importance. However, these issues together with increasing demands for availability and cost efficiency are relevant to not only mentioned safety-critical systems, but also other industrial production facilities (power plants, paper and steel mills, oil refineries etc.), transportation vehicles and many other processes on a daily basis. In substance, this is the reason why fault diagnosis has received more and more attention in the last three decades. In many cases, the term ‘fault’ is used to describe the abnormalities originate in system components (sensors, actuators, etc.) while any undesired deviations of the system parameters or variables are referred to us ‘system changes’. However, in this chapter, the ‘fault’ is regarded as AbstrAct