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Moderna ångmotorer: kolvstångens elastiska egenskaper
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2008 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Modern steam engines : elastic characteristics of the piston rod (English)
Abstract [sv]

I detta projekt har en kolvstång i en axialkolvmotor utretts i ett hållfasthetstekniskt syfte. En modell har ställts upp och simulerats med hjälp av ett FEM-program. Problemet har även analyserats analytiskt för att kunna verifiera datormodellen. Uppgiften har varit att utreda hur kolvstångens beteende påverkas när man varierar givna designparametrar. Detta gjordes med en statistisk försöksplanering. Parametrarna somvarierades var: • Snedställningsvinkeln, φ, mellan 1 till 10 grader, Figur 2 • Längden på stången, L, mellan 0.1 till 0.3 m, Figur 2 • Materialets E-modul mellan 180 till 230 GPa • Radien på kulorna i varje ände av stången, R, mellan 16.5 till 33 mm, Figur 2 Responserna som undersöktes: • Kontakttryck • Spänning (von Mises) • Egenfrekvens • Knäcklast • Styvhet Slutsatserna som drogs: • För att minimera kontakttrycket öka radien på kulorna. • För att minimera böjspänningen minimera snedställningsvinkeln. • För att höja den lägsta egenfrekvensen korta ner stången och minska radien på kulorna. • För att öka knäcklasten korta ner stången. • För att öka stångens styvhet korta ner längden och öka radien på kulorna.

Abstract [en]

In this project the piston rod originating form an axial piston engine has been evaluated from a solid mechanical point of view. A model has been created and tested using an advanced FEM-programme. To verify its authenticity analytical expressions has also been calculated to cross-reference. The projects main purpose was to find out how the piston rod’s response depended on a set of different design parameters. This was done with design of experiment. The parameters that were tested were: • General offset angle, φ, for the rod during stress between 1 to 10 degrees, Figure 2 • Length of the rod, L, between 0.1 to 0.3 m, Figure 2 • The material’s young’s modulus between 180 to 230 GPa • Radius of the sphere at each end of the rod, R, between 16.5 to 33 mm, Figure 2 The responses that were examined were: • Contact pressure • Stress (von Mises) • Eigen frequency • Buckling load • Stiffness The conclusions from the results were: • To minimize the contact pressure increase the radius of the spheres. • To minimize the bending stress minimize the offset angle. • To elevate the lowest Eigen frequency shorten the length and decrease the radius of the spheres. • To increase the buckling load shorten the length of the rod. • To increase the rod’s stiffness shorten the length of the rod and increase the radius of the spheres.

Place, publisher, year, edition, pages
2008.
Series
MMKB 2008:5 MKNB 018
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-171969OAI: oai:DiVA.org:kth-171969DiVA: diva2:844997
Available from: 2015-10-20 Created: 2015-08-10 Last updated: 2015-10-20Bibliographically approved

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