Abstract
Excessive vibrations in agricultural tractors can contribute with mechanical failures and subject the operator to discomfort. This work evaluated the vibration levels on rear and front axles of an agricultural tractor working at different forward speeds and wheel drive conditions in plowing and harrowing operations. Field tests were carried out in a completely randomized design in a factorial arrangement 3 x 2 (forward travel speeds x front-wheel-assist enable or disable), with three replications. Tractor vibration was measured using two single axis accelerometers fixed above the rear and front axles. The actual forward speed of the tractor was obtained by means of ultrasonic radar and the angular velocity of the wheels was measured with magnetic transducers. The drawbar force to pull the disc harrow was obtained by a load cell. The results showed that the vibration levels observed for the plowing operation were higher than observed for the harrowing operation. When the front-wheel-assist (FWA) was enabled there was a reduction in vertical vibration levels of the tractor axles. The highest vibration levels were observed in the frequency range of 2 to 4Hz for the both soil tillage operations evaluated
Highlights
The expansion of agricultural activities is due, largely, to the improvement of field operations and the deployment of efficient mechanized sets
Vibration levels transmitted from the soil through the tractor axles were represented by the root mean square (RMS) acceleration
Vibration levels observed for the plowing operation were higher than the levels observed for the harrowing operation
Summary
The expansion of agricultural activities is due, largely, to the improvement of field operations and the deployment of efficient mechanized sets. Contribute to mechanical failures, and subject the operator to deafness and disorders of the spinal column and stomach (PRASAD et al, 1995; SCARLETT et al, 2007; ZEHSAZ et al, 2011) These excessive vibrations can be due to inadequate operating conditions of agricultural tractors such as irregular tire inflation pressure, incorrect ballast addition, extreme forward travel speed and others. Nguyen and Inaba (2011) determined vibration levels acting on an agricultural tractor, by varying the inflation pressure of the tires and the forward speed, using a single triaxial accelerometer, placed on the rear axle of the machine. The objective was to evaluate the vibration levels on the rear and front axles of the agricultural tractor working at three different forward speeds, with additional front-wheel drive enabled and disabled, during plowing and harrowing operations
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