@phdthesis{
author = "Kolarević, Nenad",
year = "2018",
abstract = "Osnovna ideja na kojoj se zasnivaju bazni ciljevi disertacije je identifikacija ekstremno teških uslova eksploatacije mašinskih struktura i njihovih opterećenja koji predstavljaju kompleksnu interakciju izuzetno visokih toplotnih i nehomogenih uticaja, intenzivnih uticaja strujanja fluida, uticaja visokih brzina rotacije, sopstvenih i prinudnih vibracija i dr. Ovi su uticaji prisutni kod gasogeneratora turbomlaznih i turbovratilnih motora za koji je bilo potrebno razviti inovativno konstrukcijsko rešenje multifunkcionalne pregrade između rotora kompresora i turbine. Za realizaciju postavljenog cilja razvijena je odgovarajuća metodologija inženjerskog dizajna zasnovana na iterativnom razvoju, ispitivanju i analizi stanja i razaranja delova pregrade, pod nazivom Failure-based Design – FBD. Razvijen je skup od pet konstrukcijskih rešenja ove pregrade. Četvrto rešenje je postalo prihvatljivo za eksploataciju u ovim uslovima, a peto rešenje je ostvarilo sve funkcije i zadovoljilo sve zahteve. Za ovu svrhu sprovedena su mnoga eksperimentalna ispitivanja, brojne numeričke analize strujanja fluida (CFD), analiza toplotnog stanja (raspodele temperature), proračuna napona i deformacija delova pregrade, razvoj konstrukcijskih rešenja i dr. Radi realizacije osnovnog cilja, rad je obuhvatio širok spektar eksperimentalnih sadržaja, značajan broj numeričkih analiza i proračuna, analiza brojnih specifičnih havarijskih oštećenja i predloženih konstrukcijskih rešenja da bi se ova razaranja izbegla., The general idea on which the basic goals of the dissertation are founded on is the identification of extremely hard conditions of mechanical structures and their loads which represent a complex interaction of several influences, i.e. extremely high heat, nonhomogeneous influences, intensive influences of fluid flow, high rotation speeds, its natural and forced vibrations etc. These influences are present at the gas generator of turbojet and turboshaft engines for which there was a need to develop an innovative construction solution for the multifunctional bulkhead between the compressor rotor and the turbine. In order to accomplish the set goal, an appropriate methodology of engineering design was developed which is based on iterative development, testing and analysis of the state and damage of the parts of the bulkhead, which is called Failure-based Design – FBD. A set of five construction solutions for the bulkhead was developed. The fourth solution became acceptable for exploitation in these conditions, while the fifth solution accomplished all functions and met all the requirements. In order to achieve this, numerous experimental testings were performed, along with many numerical analyses of the fluid flow (CFD), heat state (temperature distribution), stress and deformations calculations of the bulkhead parts, the development of construction solutions etc. In order to achieve basic goal, the paper encompassed a wide range of experiments, a significant number of numerical analyses and calculations, analyses of many specific damages and suggested construction solutions so as to avoid these damages.",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Stanje i ponašanje dinamički napregnutih struktura u ekstremnim uslovima rada, The state and behavior of dynamicaly loaded structures in extreme operating conditions",
url = "https://hdl.handle.net/21.15107/rcub_nardus_11622"
}
