Diagnosis by the multimodel approach in the frequency domain

The surveillance of the industrial systems is of a big importance to assure the productivity and the security. Several methods can lead to the location of the abnormalities which distort the system. Seen the complexity of the processes and their not linear characteristic in the industrial domain, the multimodel approach is recognized as advantageous because it represents the system sophisticated by a set models in the time. The methods of diagnosis with models were developed by observing the evolution of the system in the temporal domain. In this paper we proposed an extension of it in the frequency domain.