20.500.12556/RUL-173143 Identifikacija togih lastnih oblik v eksperimentalni modalni analizi Identification of rigid body modes in experimental modal analysis V delu obravnavamo identifikacijo togih modalnih oblik v okviru eksperimentalne modalne analize. Postopek modalne identifikacije omogoča določitev spodnjih ostankov v admitančni matriki, pri čemer smo preučili dva različna pristopa dekompozicije: prvega, ki izhaja iz teoretično napovedanih togih nihajnih oblik, ter drugega, ki temelji na razcepu singularnih vrednosti. Razvita postopka smo najprej validirali na numeričnem modelu prostega nosilca, nato pa ju preizkusili še na eksperimentalnem primeru. Rezultate smo ovrednotili s kriteriji ustreznosti toge modalne baze. Ugotovitve potrjujejo, da oba preizkušena pristopa omogočata učinkovito dekompozicijo togih modalnih oblik in s tem dopolnjujeta dosedanje zmožnosti v uporabljenem programskem orodju. In this work, the identification of rigid-body mode shapes is addressed within the framework of experimental modal analysis. The modal identification procedure enables the estimation of lower residuals in the admittance matrix, for which two decomposition approaches were examined: one based on theoretically predicted rigid-body modes, and the other relying on singular value decomposition. The developed procedures were first validated on a numerical model of a free-free beam and subsequently applied to an experimental case. The results were evaluated using rigid-mode basis adequacy criteria. The findings confirm that both tested approaches enable effective decomposition of rigid-body modes and extend the existing capabilities of the employed software tool. modalna analiza toge lastne oblike eksperimentalna validacija admitančna matrika razcep singularnih vrednosti metoda najmanjših kvadratov modal analysis rigid body modes experimental validation admittance matrix singular value decomposition least squares method true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-09-13 08:30:42 2025-09-13 08:30:44 2025-11-05 03:33:04 0000-00-00 00:00:00 2025 0 0 XXII, 52 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.175.22:621.8.034:534.83(043.2) 276316 250032899 44054.pdf 44054.pdf 1 0F3F18566C1B57C5AC88F394C83E862A d9e001b27dd9662b600ec6d7fb9d7172abbdcc31a15b93a46ead4753661ea6f9 049d4b16-906b-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=217314 Fakulteta za strojništvo 0 0 0