Proper farm tractor seat angles for the right posture using FEM

The uncomfortable seat in a tractor can lead to the operators' discomfort, hence an increase in operational malfunction and even accidents. The attempt is made in this article to determine the appropriate angles of the tractor operator seat as to have a better posture using Finite Element Method (FEM). Here, different angles of the operator seat are compared and the best are introduced for his/her comfort at set position. The test sample is a MF 285 tractor seat the different angles of the backrest and the seat-pan of which are simulated by (FEM) in an ABAQUS software. The output vibration magnitude from the simulated seat obtained from 0.5, 1, 1.5 and 2 m s−2 at 3-66 Hz frequency with three different operator anthropometries are extracted from the software and analyzed. The evaluation of the output vibration magnitude variance at body-seat connection points indicates that the averages of the effect of angles of the backseat and seat-pan have a statistical significance at 5% level. Evaluating the body seat contact points with the 100-115 range of degree, 110 in specific for the backseat and 10-15 deg for the seat-pan indicate the appropriate angles for this tractor's seat to provide operator comfort.