20.500.12556/RUL-110011 Stabilna stanja zaprtega sistema povezanih lupin Stable states in a closed system of interconnected shells Raziskujemo stabilna stanja dveh preko cevi z ventilom povezanih balonov, ki sta napolnjena z različnim tlakom. Ko ventil odpremo, med balonoma steče tok zraka, dokler se tlaka ne izenačita. To stanje je lahko stabilno ali pa ne. Stabilnost razumemo kot zmožnost, da ostane sistem v ravnovesju kljub manjši motnji. Najprej smo z eksperimentom prišli do karakteristike obravnavanih balonov. Merili smo tlak z merilnikom tlaka in prostornino s pomočjo programa za merjenje dimenzij na posnetih fotografijah balona. Nato smo izrisali še teoretično krivuljo z uporabo Mooney-Rivlinovega reološkega modela. Sledila je primerjava teh dveh krivulj in analiza stabilnosti. Zapisali smo tudi program, ki računa pretok zraka in prikazuje spremembo tlaka v balonih. Prišli smo do ugotovitve, da je stabilnost pogojena z naklonom karakteristične krivulje. We investigated the steady states of two valve-connected balloons with different pressure. When the valve is opened, the air flows between the balloons until the pressure in the balloons equalizes. This condition may or may not be stable. Stability is understood as the ability to keep the system in balance despite a minor disturbance. To determine the characteristics, we first carried out the experiment. We measured the pressure and volume using image measurement software. Next, we plotted a theoretical curve using the Mooney-Rivlin rheological model. A comparison of these two curves and an analysis of stability followed. We also wrote a program which calculates the flow of air and shows the change in pressure in the balloons. We concluded that the slope of the characteristic curve conditions the stability. elastične lupine tlak volumski pretok stabilnost polimeri elastic shells pressure volume flow stability polymers true false false [A. Matoh] Slovenski jezik Angleški jezik Zaključna naloga 2019-09-11 07:46:50 2019-09-11 07:46:56 2023-10-20 09:32:14 0000-00-00 00:00:00 2019 0 Ljubljana 0 XIII, 36 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.11:531.787:678(043.2) 216520 16935963 4225.pdf 4225.pdf 1 07316BC01A850F96B757D25B7C49C3B8 d68c489fd4cf081c0db9e85e9fcd735a8d1e91f48fca92e9e4c2095e7606373b 02d33b1f-a1b7-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=121625 Fakulteta za strojništvo 0 0 0