Tyre modelling is a major challenge when using time domain multibody simulation models to evaluate ride comfort on off-highway commercial vehicles. Further, parameters for these big tyres are difficult to obtain and thus, commercial car tyre models are difficult to apply. In this research work, a simple vertical tyre model for off-highway ride comfort evaluation is suggested. A displaced volume approach has been developed and combined with the slip theory to yield a tyre model that can be characterised by only three parameters. Full scale measurements on a dump truck have been carried out. Force responses from measurements are compared to the simulation results. Acceleration responses and the level of wholebody vibrations have also been compared. A displaced volume approach has been developed. The model is able to predict reaction forces on a wheel passing obstacles. It requires only a few parameters that, in the current work, have been estimated by comparing simulation force responses with measurements on a full vehicle with articulated frames and passive hydraulic stabilisers. This involves significantly fewer parameters than many of the commercial tyre models, due to some limited range of analysis possibilities. The tyre models are limited to the vertical response evaluation and thus, the models are limited for use in the driving mode but not the standstill mode and skid steer vehicles, though the vertical wheel forces are the most important response when evaluating whole-body vibration of off-highway vehicles in travel mode. An FFT analysis shows that the frequencies of the tyre forces from the simulation result fit the measurements very well. This is a very important property when doing ride comfort evaluation by investigating the level of whole-body vibrations according to the defined standard. In investigating whole-body vibrations by simulation models in a model-based design process, the aim is to improve and optimise the suspension system, thus avoiding system eigenfrequencies about the peaks of the frequency weighting curves and ensuring the right combination of travel and stiffness. Based on the obtained agreement between simulated and measured results, the tyre model is considered as sufficiently well suited for comfort evaluation in lower speed ranges and subsequently, for reliable model-based design.
A ride comfort tyre model for off-highway vehicles
International Journal of Vehicle Design ; 65 , 2/3 ; 222-240
2014
19 Seiten, Bilder, Tabellen, Quellen
Article (Journal)
English
A ride comfort tyre model for off-highway vehicles
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