Riassunto analitico
History, main values and vision of Toyota are the focus of Chapter 1.
The road noise related issues will be deeply analysed in Chapter 2, starting with an overview of the problem, moving through the generation and amplification mechanisms that can lead to road noise, dealing also with analytical models that describe both road noise in general and tire cavity resonance in particular, which was an important focus of the thesis as well (also some solutions from the literature to attenuate this resonance will be proposed and criticised). Final part of this chapter will be dedicated to the testing methods mostly used to study road noise related issues, coming from the literature (but also actually applied from vehicle manufacturers and wheel and tire producers).
Last one will be Chapter 3, that will contain all the work done during the internship, i.e. the implementation with validation procedure of a new tool called wheel fixation jig, previously used in a similar way by TMC but never by TME, to clamp the wheel and try to represent the ideal clamped condition for the wheel. Purpose of this is to be able to verify some construction parameters of the wheel, such as the resonance frequencies and the “torsional stiffness”, later explained more in detail. Once all this was completed a final comparison between the component performance when clamped on the jig (wheel plus tire) and the vehicle performance in terms of road noise was executed, to evaluate possible similarities for both steel and alloy wheels.
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