ABSTRACT
Fault diagnosis is one of the major issues in every field of engineering, which may cause failure of the entire system. Fault diagnosis detection methods have been considerably increased over the past few decades. A presence of fault in structural member introduces local flexibility which affects the vibration response of the structure. The response of the system depends upon the type of fault occurs with its location. The damage in the structure leads to changes in natural frequencies and mode shapes. Early detection of presence of damage can prevent the catastrophic failure of the structures by appropriately monitoring the response to the system. In the present investigation fuzzy logic technique has been used to determine the fault in terms of crack. Here the transverse surface of the crack is considered and analyzed using FEA and fuzzy logic system. Analytical study has been performed on the cantilever beam with single crack to obtain the vibration characteristics of the beam. Here author intend to introduce fuzzy logic technique for fault diagnosis using several fuzzy rules. Here the first three natural frequencies are obtained and that are considered as input to fuzzy system. It is observed that the fuzzy controller can predict the depths and locations accurately close to the finite element analysis.
