Numerička analiza koljenastog vratila motora s unutarnjim izgaranjem

master's thesis

• Title (english): Numerical analysis of the crankshaft of internal combustion engine
• Author: Filip Domović
• Mentor: Ivica Skozrit (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2018-05-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Koljenasto vratilo ili radilica je jedna od većih komponenata konstrukcije motora s unutrašnjim izgaranjem. Služi tome kako bi se linearan pomak klipa, kojeg guraju sile plinova nastale izgranjem goriva u cilindru, pretvorio u rotacijsko gibanje odnosno zakretni moment pogodan za pogon recimo automobila. Samo koljenasto vratilo veoma je složene geometrije i opterećenja. U ovom radu provedena je numerička analiza koljenastog vratila, kako bi dobili uvid u stanje naprezanja u ovom konstrukcijskom elementu i na temelju toga proveli analizu zamora. Prije same numeričke analize opisali smo koljenasto vratilo, probleme, način izrade, proveli analizu kinematike klipnog mehanizma te zatim i dinamike. Rezultati dobiveni analizom dinamike poslužili su nam kao ulazni podaci za numeričku analizu. Objašnjene su i verificirane metode i procedure primjenjene u numeričkoj analizi. Za potrebe numeričke analize korišteni su tetraedarski konačni elementi jer su se prilikom verifikacije i analize konvergencije pokazali prikladnima i jednostavnima za ovaj problem. Numerički proračun je proveden pomoću metode konačnih elemenata (MKE) u programskom paketu Abaqus. Numerički proračun također je proveden i u programskom paketu Solidworks s analogo postavljenim rubnim uvjetima i opterećenjem onome u Abaqus-u. Nakon toga pristupilo se analizi zamora u Solidwork-ovom modulu Fatigue analysis u kojem smo okvirno dobili vrijednosti životnog vijeka pojedinih dijelova koljenastog vratila kako bi u slučaju eksploatacije u realnom svijetu znali odrediti vremenske periode inspekcije koljenastog vratila.

Abstract (english)

The crankshaft is one of the major components of the engine with internal combustion. Its purpose is to convert the linear displacement of the piston, which is pushed by the force of the gas generated by the ignition of fuel in the cylinder, into rotational motion or a torque suitable for the drive, for example the car drive. Crankshaft has very complex geometry, load and boundary conditions. Numerical analysis of the crankshaft was performed in order to gain insight into the stress state in this structural element and on that basis carried out the fatigue analysis. Prior to the numerical analysis we described the crankshaft, problems, way of producing, analysis of the kinematics of the piston mechanism and then the dynamics. The results obtained by analyzing the dynamics served us as input data for numerical analysis. The methods and procedures applied in the numerical analysis are explained and verified. For the purposes of numerical analysis, the tetrahedral finite elements were used because they proved to be appropriate and simple for this problem when verifying and analyzing convergence. Analysis was performed using the finite element method (FEM) in the Abaqus software. The numerical calculation was also carried out in the Solidworks software with an analogue set boundary conditions and load. After that, fatigue analysis in Solidwork's Fatigue Analysis module was obtained, in which we have roughly obtained lifetime values of individual crankshaft parts to determine crankshaft inspection time in case of real-world exploitation.

• Keywords: koljenasto vratilo; numerička analiza; metoda konačnih elemenata
• Language: croatian
• URN:NBN: urn:nbn:hr:235:357841
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-22 22:22:24