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Poltliitega eemaldatavate elementidega turvapuur

Teinlum, Mario (2017) Poltliitega eemaldatavate elementidega turvapuur. [thesis] [en] Roll Cage with Removable Bolt On Elements.

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Abstract

Antud lõputöö käigus projekteeriti kiirendusvõistluses One Mile Challenge osalevale sõidukile poltliitega eemaldatavate elementidega turvapuuri 3D mudel. Töö käigus järgiti konkreetseid nõudeid etteantud võistlusklassis. Töö käigus viidi sisse mitmeid muudatusi sobiliku lõpplahenduse leidmiseks. Projekteerimisjärgseid tugevusanalüüse läbiviies selgus, et siiski on vajalik lisada nõuetekohaseid lisatugevust pakkuvaid elemente eesmiste amortisaatoripüstakute ja turvapuuri vahele, peamise turvakaare ning pikisuunaliste ja tagumiste elementide vahele, rist peamise turvakaare vahele ning tugevduselemente pikisuunaliste elementide vahele. Esialgselt projekteeritud turvastruktuur ei pidanud avaldatud jõududele piisavalt vastu. Lisaelemendid pikisuunaliste elementide painete juures pakuvad pigem sõidukijuhi jaoks segavat faktorit vaatevälja kärpimisega. Lõputöö algusjärgus leitud vajadus eemaldatavete elementide järele osutus tõeseks. Eemaldatavad elemendid projekteeriti lihtsasti monteeritavaks ning demonteeritavaks tulenevalt vajadusest ligipääsule sõiduki salongiruumile erinevate tööde või modifikatsioonide läbiviimiseks. Jäeti võimalus lisada vajaduse korral erinevaid tugevduselemente kõikidesse sõlmedesse. Sobivaks materjaliks valiti külmtõmmatud keevisõmbluseta süsinikterasest toru S355J2H. Turvastruktuur kinnitatakse sõiduki kere külge nii polt- kui ka keevisliidetega. Lõputöö käigus leiti kliendi jaoks võimalikult sobiv lahendus, kuigi projekt töösse siiski lõputöö koostamise hetkel ei läinud. Lõputöö käigus täideti edukalt püstitatud eesmärgid teoreetilisel tasemel, milleks olid ohutuse tagamine, jäikuse lisamine sõiduki kerele, piisavalt kompaktne, esteetilist välimust omav ning praktiline. Lisaks selgus lõputöö käigus, et antud valdkond pakub töö autorile suurt huvi, ning ei ole välistatud, et tulevikus hakatakse sellel alal ka töötama.

Abstract [en]

The following thesis Roll Cage with Removable Bolt On Elements is based on designing a roll cage for a 1984 Audi 80 B2 Typ 81/85, which is going to be taking part in a drag race for top speed. This topic has been vital from the safety aspect since 1964 when the first roll bar was made. During the course of this thesis the author found out specific rules from FIA Appendix J – Article 253 rulebook for designing the roll cage correctly. It had to guarantee the safety of the driver, to have stiffening characteristics towards the vehicles body, to have an aesthetic appearance, to be as compact and close to the vehicles body as possible and to have practical figures when if needed to, towards getting in and out of the vehicles interior during maintenance or further modifications in the future. Some of the questions that were asked during the introduction of this thesis were: What kind of material to pick? What does the roll cage have to be like? Is it possible to make the removable bolt on elements easy to install and remove? How to attach the roll cage to the vehicle? All of these questions got an answer during this thesis. The designs for this kind of vehicle didn’t suit the needs of the vehicles owner so the author had to think of something new. After making the 3D model, strength analyzes were carried out with a chosen material which was cold drawn seamless steel tube S355J2H to understand the weak points of the construction and the need for additional reinforcements. Also for checking the quality of the initially designed roll cage. The strength analysizes revealed that many additional reinforcements were truly needed, for example two diagonal members between the main roll bar, reinforcements between the longitudal members, backstays and the main roll bar and between the roll cage and the vehicles front shock towers. The possibility of adding extra reinforcements if needed in the future was implemented in the design. The removable bolt on elements were made to be simple to install and remove for the need of access to the vehicles interior during maintenance or further modifications in the future. During this thesis the author gained knowledge and theoretical experience in this field to understand what a roll cage really is, how to design one and what it takes to make it as perfect as possible. The author has been interested in these types of constructions for a long time and it is not excluded that the author will be working in the future in this field as well.

Item Type: thesis
Advisor: Sten Soomlais
Subjects: Transport > Automotive engineering > CATIA program
Transport > Automotive engineering > Car construction > Body and chassis
Transport > Automotive engineering > Fundamentals of motor vehicle design
Divisions: Institute of Engineering > Automotive Engineering
Depositing User: Mario Teinlum
Date Deposited: 07 Jun 2017 06:09
Last Modified: 07 Jun 2017 06:09
URI: http://eprints.tktk.ee/id/eprint/2708

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