Conventional fault diagnostic methods for vibrating mechanical systems are well-known and discussed elsewhere, for example in the books [1-3]. Additionally, the many proceedings of the related conferences must be mentioned, such [4-8] which show the variety of themes and topics. Of the workshops held on the subject, only [9] will be mentioned. The newest book on the subject of diagnosis was published in 1996 by the author of this lecture, co-authored by C. Cempel, Poznan, Poland. It contains mainly the model-based idagnosis, but also summarizes the classic diagnostic methods [10]. The model-based method uses an adjusted mathematical model, adjusted to the condition states of the various requested life times of the system, which is also verified, validated ans usable. A model of this kind is the best available knowledge base of the system. This subject is discussed in another paper of the author within this conference [11]. Here, conventional diagnostic methods are discussed (whatever the word conventional means) and it is unavoidable that these methods are subjectively chosen, as they reflect the interests of the author and his areas of expertise. Figure 1 shows both diagnostic procedures in principle.
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