Modern standard agricultural tractors already reach maximum driving speeds of 60 km/h. Due to the high costs they usually have an unsuspended rear axle. Thus, the vibrations occurring at the rear axle have to be damped by the rear tyres. However, since the tyres are a compromise between traction and handling characteristics, their damping capabilities are low. All these facts, together with different excitations during the ride, like the road unevenness or tyre run-out, can lead to critical driving situations. Therefore, multi-body models are used to predict critical behaviour of a vehicle at an early stage of development. At the University of Hohenheim, a multi-body model of a tractor is used for handling analysis. Since the tyres are the link between the tractor and the ground, they influence the handling strongly. Thus, the tyre model is an essential part of the entire vehicle model. The University of Hohenheim uses a self-developed dynamic model, the Hohenheim Tyre Model. For the validation of the tractor model, a test tractor equipped with various sensors was used. Several handling manoeuvres were accomplished and the driving dynamics relevant data, like driving speed, angular rates and several accelerations of the chassis, cabin and driver's seat were measured. Finally the tractor model was used for handling analysis and as a result some proposals regarding handling are given.
Handling analysis of agricultural tractors using multi-body simulation
2007
6 Seiten, 8 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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