Tyres have a decisive impact on rolling noise and vibrational comfort of the vehicle. Considerable variations occur in terms of noise level inside the vehicle, even between tyres of the same size. As large numbers of different tyres are available for each vehicle model, a significant amount of testing is required in order to safeguard rolling noise quality. To solve this problem, a cross-model process to pre-assess tyres in terms of the interior noise they produce is being developed. This systematic process combines experimental and analytical methods. The key related topics are: (1) FEM modelling of the tyre; (2) determining the correlation between tyre-induced forces on the wheel hub and noise inside the vehicle; (3) identifying the relevant natural frequency characteristics of the tyres with a view to the resultant spectra of forces on the wheel hub; and (4) comparative rolling noise prediction. Finally, by defining the tyre criteria relevant to rolling noise the aim is to influence tyre development in a targeted manner and discard unsuitable tyres at a preliminary stage. This will enable high rolling noise quality to be safeguarded while at the same time reducing the required vehicle testing. The finite element tyre model presented here describes tyre transmission behaviour in the frequency range up to 250 Hz sufficiently accurately. Suitable model reduction also makes its use in complete-vehicle models possible without problems. With the aid of the simulation results presented here, greater comprehension of the wheel's vibration behaviour can be obtained. The influence of rotation was shown and lowfrequency radial tyre modes, the cavity mode and the eigenmode of the rim identified as the most important modes with regard to interior noise. It was also shown that wheel forces input to the suspension are basically suitable as a tyre rolling noise characterisation parameter. In addition, a practical approach to testrig tyre rolling noise assessment largely independently of the vehicle was developed, though additional measurements are essential before a robust data basis can be built up. Additional work is needed on testing procedure and operating conditions as well.
Experimental and numerical characterisation of tyres in terms of rolling noise
2012
18 Seiten, 16 Bilder, 1 Tabelle, 10 Quellen
Conference paper
Storage medium
English
Reifen (Fahrzeugreifen) , Reifenabrollgeräusch , Bewertung , experimentelle Untersuchung , numerisches Verfahren , mathematische Modellierung , Finite-Elemente-Methode , Übertragungsverhalten , Simulation , Schwingungsverhalten , Gürtelreifen , Hohlraum , Felge , Eigenschwingung , Prüfverfahren , Betriebsverhalten , Betriebsbedingung
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