Numerička analiza silosa za skladištenje žitarica

master's thesis

• Title (english): Numerical analysis of grain storage silo
• Author: Luka Abramović
• Mentor: Ivica Skozrit (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2021-01-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Zadatak rada bio je modeliranje i numerička analiza nosive konstrukije silosa za žitarice. U uvodu su ukratko opisani silosi, njihova namjena, vrste te način projektiranja i problematika koja se javlja tijekom konstruiranja silosa. U sljedećem poglavlju napravljen je 3D model silosa u programskom paketu Solidworks. Sve dimenzije, geometrija i komponente silosa preuzete su iz kataloga tvrtke Polnet Sp. z o.o koja se bavi proizvodnjom različitih vrsta silosa. Tijekom modeliranja pojedinih... More komponenti konstrukcije napravljena su određena pojednostavljenja kako bi se ubrzala i olakšala numerička analiza. Pri tome su, naravno, napravljena samo ona pojednostavljenja koja ne utječu znatno na čvrstoću i stabilnost konstrukcije. Zatim je provedena verifikacija konačnih elemenata na jednostavnijem primjeru. Za cilindrični spremnik opterećen tekućinom analitički je određen iznos najvećeg radijalnog pomaka, a zatim je u programskom paketu Abaqus provedena numerička analiza za taj primjer. Pri tome su se koristile različite vrste konačnih elemenata, a na temelju usporedbe konvergencije i točnosti rješenja odabrani su oni konačni elementi koji su najprikladniji za analizu silosa. Prije provođenja same analize izvršeni su analitički proračuni koji opisuju opterećenja koja djeluju na konstrukciju. Glavno i najveće opterećenje je ono koje se javlja uslijed težine uskladištenog materijala, a proračun tlakova koji djeluju na unutrašnje stijenke silosa proveden je prema normi EN 1991-4. Zatim, prema normi EN 1991-1-4:2005+A1 proveden je proračun za tlak koji nastaje uslijed djelovanja vjetra. Nakon određivanja svih opterećenja koja djeluju na silos, odabira prikladnih konačnih elemenata te modeliranja nosive konstrukcije silosa, silos je konačno podvrgnut analizi. Numerička analiza silosa također je izvršena u programskom paketu Abaqus te je izvršena za slučaj najnepovoljnijeg opterećenja silosa. Nakon analize prikazani su i komentirani rezultati naprezanja i pomaka. Na kraju, temeljem analize i usporedbe rezultata izveden je i zaključak. Less

Abstract (english)

The task of this paper was modeling and numerical analysis of the supporting construction of a grain silo. The introduction briefly describes the silos, their purpose, types and methods of design and issues that arise during the construction of silos. In the next chapter, a 3D model of the silo was made in the Solidworks software package. All dimensions, geometry and silo components are taken from the catalog of company Polnet Sp. z o.o. which deals with the production of various types... More of silos. During the modeling of individual components of the construction, certain simplifications were made in order to speed up and facilitate the numerical analysis. In doing so, only those simplifications have been made that do not significantly affect the strength and stability of the construction. The finite element verification was then performed on a simpler example. For a cylindrical tank loaded with liquid, the amount of the maximum radial displacement was analytically determined, and then a numerical analysis for that example was performed in the Abaqus software package. Different types of finite elements were used, and based on the comparison of convergence and accuracy of the results, those finite elements that were most suitable for silo analysis were selected. Prior to performing the analysis, analytical calculations were performed describing the loads acting on the construction. The main and maximum load is that which occurs due to the weight of the stored material, and the calculation of pressures acting on the inner walls of the silo was carried out according to standard EN 1991-4. Then, according to the standard EN 1991-1-4: 2005 + A1, a calculation was performed for the pressure caused by the action of wind. After determining all the loads acting on the silo, selecting the appropriate finite elements and modeling the supporting construction of the silo, the silo could finally be subjected to analysis. Numerical analysis of the silo was performed in case of the most unfavorable load. After the analysis, the results of stress and displacement are presented and commented. Finally, based on the analysis and comparison of the results, a conclusion was made. Less

• Keywords: silos; nosiva konstrukcija; uskladišteni materijal; tlak; numerička analiza; metoda konačnih elemenata
• Keywords (english): silo; supporting construction; stored material; pressure; numerical analysis; finite element method
• Language: croatian
• URN:NBN: urn:nbn:hr:235:663247
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-01-15 10:13:06