|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||Sviluppo di una metodologia di calcolo integrata FEM-Multibody per l'analisi a fatica dell'albero a gomiti di un motore a combustione interna|
|Titolo in inglese||Development of an integreted FEM-Multibody methodology for fatigue analysis of an internal combustion engine crankshaft|
|Struttura||Dipartimento di Ingegneria|
|Corso di studi||Ingegneria Del Veicolo (D.M.270/04)|
|Data inizio appello||2015-04-16|
|Disponibilità||Accessibile via web (tutti i file della tesi sono accessibili)|
In questo lavoro di tesi, svolto internamente a Maserati, è stata sviluppata una metodologia di calcolo per l'analisi a fatica dell'albero motore, comprensiva di condensazione statica dei componenti, analisi dinamica mediante codice multibody, stress recovery e analisi a fatica finale.
In this thesis work, done internally in Maserati, a calculation method for fatigue analysis of the crankshaft has been developed, including static condensation of the components, dynamic analysis using a multibody code, stress recovery and a final fatigue analysis. The main objective was to develop a process which could be sufficiently reliable, but at the same time, fast and flexible, so that it could be used by the company in the initial phase of the crankshaft project. In order to meet these demands, a non-commercial multibody code, owned by Maserati, has been used, which has been adapted and enhanced to be able to adequately simulate the bending and the gyroscopic moment of the crankshaft. The results obtained has been compared with results from experimental tests and analysis previously carried out using another procedure, which instead requires the use of a more detailed commercial multibody code but with longer setting and calculation times. What has been obtained is a very good correlation with experimental data as regards the torsional vibration, the capability to simulate the bending behaviour of the shaft (assessed by the forces transmitted to the supports), a good response in terms of safety factors but a certain discrepancy between the two methods with regard to the critical angular velocities. It is believed that the developed calculation procedure, although it could still be improved, can be already used in the early stage of the design to compare and analyse the criticality of different constructive solutions, since it allows to visualize the movement of the crankshaft, to identify the most critical points of the component and determine whether it could achieve or not the fatigue failure.