Iskanje po katalogu digitalne knjižnice

Opis: Diplomsko delo obravnava topološko optimizacijo nosilca za dvig motorja z notranjim izgorevanjem, z namenom zmanjšanja mase ob ohranjeni varnosti in funkcionalnosti. Uporabljeni sta bili metodi topološke optimizacije (CAESS ProTOp) in numerične simulacije (Altair SimSolid) za analizo napetosti, pomikov in lastnih frekvenc. Upoštevane so bile realne obremenitve, vključno s silami pod kotom. Najprimernejša izvedba (varianta B) je maso zmanjšala za 31,6 %, ob 12,4 % višji kritični napetosti in ustrezni lastni frekvenci. Pred uporabo v praksi je priporočeno izdelati prototip in ga stestirati.
Ključne besede: Topološka optimizacija, nosilec motorja, zmanjšanje mase
Objavljeno v DKUM: 22.09.2025; Ogledov: 0; Prenosov: 13
Celotno besedilo (3,10 MB)

Opis: Anaerobic digestion (AD) is an important technology that can be engaged to produce renewable energy and valuable products from organic waste while reducing the net greenhouse gas emissions. Due to the AD process complexity, further development of AD technology goes hand in hand with the advancement of underlying mathematical models and optimization techniques. This paper presents a comprehensive and critical review of current AD process modeling and optimization techniques as well as various aspects of further processing of AD products. The most important mechanistically inspired, kinetic, and phenomenological AD models and the most frequently used deterministic and stochastic methods for AD process optimization are addressed. The foundations, properties, and features of these models and methods are highlighted, discussed, and compared with respect to advantages, disadvantages, and various performance metrics; the models are also ranked with respect to adequately introduced criteria. Since AD process optimization affects heavily the required treatment and utilization of AD products, biogas and digestate utilization in the production of renewable energy and other valuable products is also addressed. Furthermore, special attention is devoted to the challenges and future research needs related to AD modeling and optimization, such are modeling issues related to foaming and microbial activities, AD model parameters calibration, CFD simulation challenges, availability of experimental data, and optimization of the AD process with respect to further biogas and digestate utilizations. As current research results indicate, further progress in these areas could notably improve AD modeling robustness and accuracy as well as AD optimization performance.
Ključne besede: renewable energy, anaerobic digestion, biogas plant, mathematical models, optimization algorithms, products utilization
Objavljeno v DKUM: 31.01.2025; Ogledov: 0; Prenosov: 17
Celotno besedilo (19,46 MB)
Gradivo ima več datotek! Več...

Opis: Bistvo diplomskega dela obsega zasnovo novega Tercijalskega mosta, ki mora premostiti 50-metrsko razpetino med pobočjema reke Krke v Kostanjevici na Krki. Zasnova temelji na predpostavkah in omejitvah, ki jih zastavi konstrukter ter so določene s standardi. Modeliranje mostu je v CAD programu Solidworks. Celoten most je grajen in zmontiran iz vremensko odpornega jekla Corten S355JOWP. Konstrukcijski elementi so izbrani glede na racionalno presojo iz prakse. Le-ta je na koncu potrjena ali ovržena s statičnimi preračuni po evropskih standardih EUROCODE, ter s preračunom, ki je narejen po MKE (metoda končnih elementov). Rezultati so na koncu tudi ovrednoteni.
Ključne besede: zasnova mostu, jeklena konstrukcija, most za pešce, MKE analiza.
Objavljeno v DKUM: 30.09.2024; Ogledov: 0; Prenosov: 42
Celotno besedilo (4,59 MB)

Opis: Anaerobic digestion (AD) is a promising technology for renewable energy production from organic waste. In order to maximize the produced biogas quantity and quality, this paper deals with the optimization of the AD process in a CSTR bioreactor of a full-scale biogas plant. For this purpose, a novel approach was adopted coupling, a highly complex BioModel for AD simulation, and a gradient-based optimization method. In order to improve AD performance, the dosages of various types of biological additives, the dosages of inorganic additives, and the temperature in the bioreactor were optimized in three different scenarios. The best biogas quality was obtained using multi-objective optimization, where the objective function involves the following two conflicting objectives: the maximization of biogas production and minimization of the needed heating energy. The obtained results show that, potentially, the content of CH4 can be increased by 11%, while the contents of H2, H2S, and NH3 can be reduced by 30%, 20%, and 81% when comparing the simulation results with the experimental data. The obtained results confirm the usefulness of the proposed approach, which can easily be adapted or upgraded for other bioreactor types.
Ključne besede: additives, anaerobic digestion, approximation method, BioModel, complex substrate, gradient-based optimization, process conditions
Objavljeno v DKUM: 12.03.2024; Ogledov: 298; Prenosov: 43
Celotno besedilo (7,33 MB)
Gradivo ima več datotek! Več...

Opis: Diplomsko delo opisuje konstruiranje proizvodnega procesa od ideje, ki je narisana na listu papirja, do končne vloge sestava v podjetju naročnika. V diplomski nalogi se je razvijal transporter z mehanskim zaklepom. Pri nalogi je bilo potrebno raziskati lastnosti materialov in uporabnost standardnih elementov. Oblikoval se je transporter, ki ima možnost premikanja, in zaklepni mehanizem. Pri nalogi je bilo potrebno izdelati takšen transporter, kjer robot odvzame kotliček z natančnostjo do dveh milimetrov. Razviti je bilo potrebno mehanizem, ki je popolnoma mehanski s prednapetjem in končnimi legami. Za varnost zaposlenih so se izdelala varnostna vratca, kjer lahko serviser vstopa v prostor
Ključne besede: konstruiranje, mehanski zaklep, transporter, proizvodni
Objavljeno v DKUM: 09.10.2023; Ogledov: 366; Prenosov: 70
Celotno besedilo (4,65 MB)