Uporaba spektrov tretjega reda pri analizi nelinearnih mehanskih nihanj : magisterij

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Uporaba spektrov tretjega reda pri analizi nelinearnih mehanskih nihanj : magisterij

Simonovski, Igor

Predstavljene so osnovne definicije in pojmi, ki jih srečamo pri spektrih tretjega reda. Prikazana je definicija zveznega in diskretnega spektra tretjega reda, pojasnjeno osnovno definicijsko območje ... (IT) zveznega spektra ter njegovo povečanje za dodani zunanji trikotnik (OT) pri diskretnem spektru tretjega reda. Podane so statistične lastnosti cenilke spektra tretjega reda. V okviru izboljšanja statističnih lastnosti te cenilke sta predstavljeni poševnostna funkcija bispektra ter kvadratična bikoherenca. Proučeni so vplivi izbire okna, števila prostostnih stopenj bispektra, ter občutljivost cenilke kvadratične bikoherence na deljenje z majhnim številom. Razdelan je tudi algoritem za zaznavanje kvadratičnega sklapljanja faz. Praktična uporaba spektrov tretjega reda je prikazana na primeru pralnega stroja ter rezalnega procesa. V okviru analize pralnega stroja so bispektri uporabljeni za pridobivanje dodatnih informacij o tem nelinearnem dinamskem sistemu ter za zaznavo sprememb obratovalnega stanja. V primeru rezalnega procesa je poudarek na uporabi kvadratične bikoherence za zaznavo pojava drdranja pri katerem se je pokazalo pogostejše kvadratično sklapljanje faz. Na podlagi teoretičnih dognanj in lastnih izkušenj so podana priporočila za kvaliteten izračun bispektrov oz. njegovih normaliziranih izvedenk poševnostne funkcije bispektra ter kvadratičnoe bikoherence.

Type of material - master's thesis ; adult, serious

Publication and manufacture - Ljubljana : [I. Simonovski], 1998

Language - slovenian

COBISS.SI-ID - 2789915

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Author
Simonovski, Igor

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Kuhelj, Anton, 1934-2014

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Kuhelj, Anton, 1934-2014	03057

Source: Personal bibliographies and: SICRIS

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