Dimenzioniranje plinskih i parnih turbina spram potresa

Orčić, Branislav (2008) Dimenzioniranje plinskih i parnih turbina spram potresa. = Design of gas and steam turbine to earthquake. Scientific master's thesis , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Stegić, Milenko.

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Abstract (Croatian)

U radu je prikazan pregled prisilnih vibracija uslijed različitih uzbuda važnih za izračune utjecaja potresa na kostrukcije. Opisani su, analizirani i komentirani slijedeći standardni postupci i metode proračuna (codes): statička, kvazistatička, prema Uniform Building Code (UBC), Earthquake resistance of stresses – EUROCODE 8, postupak ocjene čvrstoće plinskih turbina i parnih turbina spram potresa u ALSTOM-u, ISO 3010, dinamička i kvazidinamička. Predstavljena je jedna novija kvazidinamička metoda,koja se primjenjuje u ALSTOM-u Karlovac [5] i prihvatljiva je za većinu konstruktera. Ta metoda primjenjuje dijagrame odziva konstrukcije na potrese i pretvara ih u ekvivalentne uzbude za stacionarno stanje. U cilju predlaganja standardne veličine seizmičkog ubrzanja tla, koja će obuhvatiti propise većine zemalja, analizirani su propisi i standardi nekih zemalja, kao i navedeni standardi (UBC, ISO3010 itd). Na osnovi provedenih analiza je za provjeru čvrstoće turbinskih konstrukcija, predložena standardna vrijednost horizontalnog ubrzanja zemljinog tla i vertikalnog ubrzanja . U većini slučajeva, oba ubrzanja djeluju istovremeno. Predložen je postupak provjere čvrstoće turbinskih konstrukcija. Koja će se od metoda proračuna u okviru predloženog postupaka primjeniti, ovisi o položaju frekvencija oblika vibriranja konstrukcije u odnosu na područje od 0 Hz do 33 Hz i osposobljenosti konstruktera. Na primjerima proračuna odziva nosača i kučišta usisa zraka plinske turbine, dinamičkom i novijom kvazidinamičkom metodom su uspoređene proračunske vrijednosti naprezanja. Zaključeno je da se novija kvazidinamička metoda može uspješno primjenjivati za ocjenu čvrstoće turbinske konstrukcije, spram potresa.

Abstract

The thesis surveys forced vibrations originating from dissimilar excitations important for the calculation of earthquake impact on mechanical structures. The following standard procedures and methods (codes of practices) have been depicted, analysed and commented on: static and quasystatic method according to Uniform Building Code (UBC); earthquake resistance of stresses (EUROCODE 8); "Alstom" procedure for assessment of gas and steam turbines` strengths to earthquakes; ISO3010, dynamic and quasydynamic methods. A new quasydynamic method , applied in ""ALSTOM-Karlovac"" [5] , has been introduced and it has proved to be eligible for the majority of mechanical designers. This method uses the records of structure response to earthquakes and transforms them into equivalent excitations for steady-state response. Regulations and standards in many countries, as well as mentioned international standards (UBC, ISO3010, etc.) were analysed with the aim of suggesting standard magnitude of seismic soil acceleration that will comprise regulations in most countries. Upon conducted strength analyses of various turbine designs, the standard seismic acceleration of horizontally and vertically has been proposed. In most cases both acceleration components act on simultaneously. The new procedure for strength verification of turbine mechanical structure has been proposed. The choice of codes of practices depends not only upon the position of frequencies of structure vibrations` modes as regards the frequency range from 0 to 33 Hz, but also on the skills of the designer. The standard dynamic method is compared with the new quasydynamic method on examples of stress calculation of support and air intake manifold of a gas turbine. It has been concluded that the new quasy-dynamic method can successfully be applied for the assessment of turbine design strength to earthquake impact.

Item Type: Thesis (Scientific master's thesis)
Uncontrolled Keywords: potres; dinamička metoda; kvazidinamička metoda; plinska turbina; parna turbina
Keywords (Croatian): earthquake; dynamic method; quasidynamic method; gas turbine; steam turbine
Divisions: 200 Department of Engineering Mechanics > 230 Chair of Mechanical Systems Dynamics
Date Deposited: 22 Sep 2014 18:00
Last Modified: 16 Oct 2015 13:17
URI: http://repozitorij.fsb.hr/id/eprint/599

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