Utjecaj krutosti rebrastih ukrućenja na raspodjelu naprezanja u kotlu srednje energetskog transformatora

undergraduate thesis

• Title (english): Influence of rib stiffeners stiffness on the stress distribution in a medium power transformer boiler
• Author: Stjepan Barukčić
• Mentor: Zdenko Tonković (mentor)
• Committee member: Ivica Galić (predsjednik povjerenstva)
• Committee member: Krešimir Vučković (član povjerenstva)
• Committee member: Zdenko Tonković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

S obzirom na nedavni porast cijena materijala na svjetskom tržištu mnoge tvrtke rade na optimiranju svojih dijelova u cilju što većeg smanjenja mase i povećanja financijske isplativosti njihovih proizvoda. Tako i tvrtka Končar-Distributivni i specijalni transformatori pokušava optimizacijom dijelova kotla, pomoću numeričkih analiza, smanjiti masu dijelova transformatora na kojima je optimizacija moguća uz određeni faktor sigurnosti. Jedan od dijelova na kojemu se može provesti optimiranje je ukruta transformatora koja ima zadatak povećati krutost kotla transformatora.
U ovom radu, smanjenje mase ukruta na kotlu transformatora prikazano je na principu orebrene ploče. Numeričkom analizom prikazana su naprezanja i pomaci stranice kotla za stvarnu ukrutu koja je zavarena na stranicama kotla te alternativna rješenja za ukrute koja bi zadovoljila uvjete čvrstoće i krutosti. Mijenjanjem dimenzija i materijala, provedbom analize te približavanjem točni rezultatima primjenom konvergencije rješenja, određena su sva rješenja sa stajališta mase i financija te je odabrano konačno i najbolje rješenje.

Abstract (english)

Given the recent rise in material prices on the world market, many companies are working to optimize their parts in order to maximize weight loss and increase the financial viability of their products. Thus, the company Končar-Distributivni i specijalni transformatori is trying to reduce the mass of transformer parts where optimization is possible with a certain safety factor by optimizing the transformer parts, using numerical analyzes. One of the parts on which optimization can be carried out is the rigidity of the transformer which has the task of increasing the rigidity of the transformer boiler.
In this paper, the reduction of the stiffness mass on the transformer boiler is shown on the principle of a ribbed plate. Numerical analysis shows the stresses and displacements of the boiler side for the actual stiffness welded to the boiler sides and alternative stiffening solutions that would meet the conditions of strength and stiffness. By changing the dimensions and materials, conducting the analysis and approaching the exact results by applying the convergence of solutions, all solutions from the point of view of mass and finance were determined and the final and best solution was chosen.

• Keywords: kotao transformatora; ukrute; smanjenje mase; naprezanja; pomaci.
• Keywords (english): transformer tank; stiffeners; mass reduction; stresses; displacements.
• Language: croatian
• URN:NBN: urn:nbn:hr:235:747941
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2027-09-30
• Created on: 2022-09-21 23:25:47