|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||Modellazione e analisi di sistemi di compensazione degli effetti termici sul terzo elemento idraulico di una vettura di Formula 1.|
|Titolo in inglese||Modelling and analysis of systems to compensate thermal effects on a F1 car hydraulic rear heave unit.|
|Struttura||Dipartimento di Ingegneria "Enzo Ferrari"|
|Corso di studi||Advanced Automotive Engineering (D.M.270/04)|
|Data inizio appello||2019-10-24|
|Disponibilità||Embargo di 3 anni|
|Data di rilascio||2022-10-24|
Il progetto di tesi è stato sviluppato presso Scuderia Toro Rosso S.p.a. con l’obiettivo di identificare nuove soluzioni per migliorare il layout del terzo elemento di una sospensione idraulica e valutarne la performance.
The thesis project was developed at Scuderia Toro Rosso S.p.a. with the aim of identifying some new solutions to improve the layout of a hydraulic rear heave unit and evaluate their performance. In a competitive context like the Formula 1, different and innovative suspensions design have been developed over the years to follow the more and more strict relationship between tyre forces and aerodynamics. Suspension became the main tool to control the pitch, the roll and the heave of the vehicle in any portion of the track in order to guarantee the optimal level of downforce. The use of active suspensions was banned by the FIA (Federation Internationale de l’Automobile) to reduce the costs incurred by the teams. The high power-volume ratio and the possibility to construct complicated control logics of hydraulics systems was exploited by Mercedes; in 2011 they developed a Front to Rear interconnected layout. This kind of suspensions mimics the behaviour of active ones and it became popular among the different teams. Again, FIA forbid the use of interconnected suspensions to reduce costs and to try to maintain competitiveness among the different teams. A great number of teams is still using suspensions system controlled by hydraulics. They offer advantages in packaging and they make easy components access, reducing time required for set up during race events. During normal operation, suspensions are subjected to large temperature variations. Temperature increase induces oil expansion that must be taken under control to avoid failure or mismatch in suspension behaviour respect to the target. A new model for Rear Heave Unit (RHU) was developed starting from the lasts hydraulic interconnected suspension system designed by the company. The RHU shows an increase in stiffness as function of temperature. This leads to an undesired variation in Rear Ride Height (RRH), leading to a reduction of the aerodynamic performance of the car. This effect can be addressed mainly to oil expansion but also the increasing of air spring pressure contributes to it. During the internship, AMESim was used to model new layouts in order to compensate oil expansion. Their performance is evaluated in term of reduction in RRH variation, weight and packaging to identify the most promising ones. A system to compensate for air spring stiffening is also proposed in this essay and its performance is evaluated in combination with the different systems. This thesis reports a theoretical introduction which includes the description of the software used to run simulations, the detailed explanation of the components governing equations and the assumptions introduced. Then the working principles and the design method for each system are presented, followed by a comment on the results of simulations. The real value obtained in results and the data exploited to run simulations are obscured or omitted to preserve business secret. This work is a preliminary comparative analysis and it was possible to identify two solutions able to completely relief oil expansion effect. Each of them requires some compromises in term of performance or weight and space. These two solutions are the perfect candidates to submit to a deeper analysis. The further development steps include: a refinement of the simulations based on the analysis of a larger sample of track data, and the design of the different components to effectively evaluate their impact on the basic layout of the new car.