Other than the tractor components technological development, in the last decennia the interest for the driver comfort increased. Noise and vibration control priority increased too. Especially for vibration the tires quality plays a great role. Modern tractors are often equipped without any type of suspension and the tires task is to reduce vibration caused by the uneven ground where these machines travel. When the tractor moves, it is solicited by a vibrational excitation that, through the vehicle, reaches the driver causing to him a stressing and tiring situation. To verify the vibrational comfort value given by these radial-ply tires, tests have been carried out using a 93 kW tractor. The tests have been executed with two different tractor speeds (12 and 7 km/h) and using both an artificial test track (ISO 5008) and an asphalt road. Four different types of tires have been used (from three different manufacturers): for each test cycle the inflation pressure has been changed. The acceleration values have always been revealed over the cabin platform to make irrelevant the running in of the seat. In this way it was possible to extract the tires parameters which most influence the dynamical behaviour of the tractor and therefore the operator’s comfort. 192 test have been conducted, using four different tires at two different pressure, 3 different track type, 2 different speed, and repeating each test three times.
Whole body vibration (WBV) tansmitted to the operator by tractors equipped with radial tires
CALVO, Angela;
2008-01-01
Abstract
Other than the tractor components technological development, in the last decennia the interest for the driver comfort increased. Noise and vibration control priority increased too. Especially for vibration the tires quality plays a great role. Modern tractors are often equipped without any type of suspension and the tires task is to reduce vibration caused by the uneven ground where these machines travel. When the tractor moves, it is solicited by a vibrational excitation that, through the vehicle, reaches the driver causing to him a stressing and tiring situation. To verify the vibrational comfort value given by these radial-ply tires, tests have been carried out using a 93 kW tractor. The tests have been executed with two different tractor speeds (12 and 7 km/h) and using both an artificial test track (ISO 5008) and an asphalt road. Four different types of tires have been used (from three different manufacturers): for each test cycle the inflation pressure has been changed. The acceleration values have always been revealed over the cabin platform to make irrelevant the running in of the seat. In this way it was possible to extract the tires parameters which most influence the dynamical behaviour of the tractor and therefore the operator’s comfort. 192 test have been conducted, using four different tires at two different pressure, 3 different track type, 2 different speed, and repeating each test three times.
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