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master's thesis
Konstrukcija okvira za brdski bicikl
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. urn:nbn:hr:235:282284
Kuzmić, Nikola
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Kuzmić, N. (2017). Konstrukcija okvira za brdski bicikl (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:282284

Kuzmić, Nikola. "Konstrukcija okvira za brdski bicikl." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:282284

Kuzmić, Nikola. "Konstrukcija okvira za brdski bicikl." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:282284

Kuzmić, N. (2017). 'Konstrukcija okvira za brdski bicikl', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 26 July 2024, https://urn.nsk.hr/urn:nbn:hr:235:282284

Kuzmić N. Konstrukcija okvira za brdski bicikl [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2017 [cited 2024 July 26] Available at: https://urn.nsk.hr/urn:nbn:hr:235:282284

N. Kuzmić, "Konstrukcija okvira za brdski bicikl", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:235:282284

Metadata
TitleKonstrukcija okvira za brdski bicikl
Title (english)Frame design for a mountain bike
AuthorNikola Kuzmić
MentorNenad Bojčetić (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2017-07-21, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
General Mechanical Engineering (Construction)
Abstract
Ovim je radom dana konstrukcija brdskog bicikla sa stražnjim ovjesom (engl. Full Suspension). Obrađene su vrste bicikala prema namjeni, odnosno prema vrsti ovjesa. Opisana je optimizacija konstrukcija u općenitom smislu te s posebnim naglaskom na topološku optimizaciju i optimizaciju oblika. Isto tako, radom je dana osnovna matematička podloga za razumijevanje ovih metoda optimizacije te su nabrojeni najčešći alati za navedene optimizacije. Nadalje, radom su prikazani sigurnosni aspekti vezani za okvir brdskog bicikla prema normi EN 14766:2006-09 te načini ispitivanja dinamičke izdržljivosti okvira bicikla. Objašnjeno je hidrooblikovanje, vrlo čest tehnološki postupak izrade bicikla kojim se pokušava smanjiti masa koristeći se pogodnim oblicima profila cijevi za određenu vrstu naprezanja. Također, radom je dan pregled važnosti definiranja geometrije okvira i stražnjeg ovjesa te su navedena karakteristična svojstva u vožnji bicikla koja se postižu različitom geometrijom okvira i stražnjeg ovjesa. Kako bi se mogao konstruirati okvir brdskog bicikla, u radu su analizirana pretpostavljena opterećenja koja djeluju na okvir bicikla pri vožnji. Analizirana su opterećenja uslijed klačenja ravnom podlogom maksimalnom snagom, vožnje bicikla uz kočenje, slobodnog pada s visine 0,5 metara te zamor. Napravljena je provjera čvrstoće poluge stražnjeg ovjesa klasičnim pristupom i metodom konačnih elemenata te je na posljetku dana usporedba rezultata. Koristeći se topološkom optimizacijom i optimizacijom oblika s ciljem zadržavanja krutosti poluge i ograničenjem smanjenja volumena poluge za do 20 %, dobivena je konstrukcija optimizirane poluge te je dana usporedba s ne optimiziranom polugom. Na kraju ovog rada dan je zaključak.
Abstract (english)
This paper presents frame design for a full suspension mountain bike. The bicycle types are sorted according to their purpose and type of suspension. Structural optimization is described in general with a special emphasis on topology and shape optimization. Furthermore, this paper provides basic mathematical background for understanding the given optimization methods and most common optimization software’s are listed. Moreover, the safety aspects of the mountain bike frame according to EN 14766:2006-09 and the dynamic testing of the bicycle frame are shown. Hydroforming is explained, a very common technological process of bicycle making which goal is to reduce mass using the most suitable pipe profile shape for a particular type of stress. Also, this paper gives overview of the importance of defining the frame and rear suspension geometry, as well as the characteristic features of the bicycle handling that are achieved by the different geometry of the bike frame and rear suspension. In order to construct the frame of the mountain bicycle, the paper analyzes the assumed loads affecting the frame of the bicycle during driving. Heavy loading during cycling in flatlands, bicycle riding and simultaneous braking, free fall from 0,5 meters in height and fatigue are studied. Strength of the rear suspension lever (rocker) is calculated using classical approach and finite element method. The results of strength calculation are compared. By using topology optimization and shape optimization to maintain the stiffness of the lever and limiting the volume reduction by up to 20%, the structure of the optimized lever is obtained and compared to the non-optimized lever.
Keywords
Languagecroatian
URN:NBNurn:nbn:hr:235:282284
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2019-05-22 19:53:21