1,721,140 research outputs found
Measurement problems arising from the use of a recursive algorithm for model identification of electrical systems
No full textThe use of parameter estimation techniques in practical applications requires accurate analysis of the associated measurement and computation problems. With reference to an already proposed model identification procedure, the authors deal with the experimental tests carried out in order to highlight problems and to find the most appropriate solutions. In particular, a synchronization method is described, and some suggestions concerning the optimal working conditions of all the necessary devices are reported
Valutazione dell'esposizione dei lavoratori ai campi elettromagnetici generati da dispositivi per risonanza magnetica
No full textKnowledge-based approach to instrument fault detection and isolation
No full textA knowledge-based instrument fault detection and isolation (IFDI) technique is proposed and described. It is based on the 'duplication' of measurement devices by means of suitable mathematical relationships and is implemented on an expert system. The latter allows a mathematical model to be substituted by integrating qualitative models with empirical knowledge, thereby reducing overall computer effort without any corresponding decrease in diagnostic capabilities. This technique is particularly efficient when applied to detect and isolate faults in measurement systems integrated in control architectures. It is applied to an automatic measurement station for induction motor testing to illustrate its characteristics and performance. The experimental results are also reported, illustrating IFDI performance mainly in terms of promptness, sensitivity, and selectivity
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