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   <subfield code="a">Accurate solutions and stability criterion for periodic oscillations in hysteretic systems</subfield>
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   <subfield code="a">Sommario: Nello studio della risposta periodica degli oscillatori isteretici si incontrano difficoltà dovute alla natura non olonoma del legame costitutivo. Nel presente lavoro queste difficoltà vengono superate in parte adottando una formulazione incrementale che riconduce il caso isteretico a quello elastico non lineare seppure al prezzo di un allargamento dello spazio delle variabili di stato. Le soluzioni periodiche sono determinate seguendo il metodo del bilancio armonico con molte componenti; la stabilità viene analizzata con la teoria di Floquet. Le equazioni sviluppate sono utilizzate per determinare le curve di risposta in frequenza sotto una forzante sinusoidale, di un oscillatore che, benchè semplice, presenta una notevole varietà di comportamento. I risultati ottenuti mostrano chiaramente le lacune dei metodi tradizionali; l'influenza delle armoniche superiori in molti casi è ben lungi dall'essere trascurabile.</subfield>
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