Structural modification effects on the dynamic behavior of an agricultural tractor
1998
Clijmans, L. | Ramon, H. | De Baerdemaeker, J.
Even during normal operation, agricultural machines are exposed to a number of d isturbances that can generate excessive vibration levels. The disturbances origi nate from soil roughness in combination with driving speed or from rotating elem ents within the machine. Machine vibrations may be uncomfortable to the driver. Vibrations may affect the manual or automatic controls and reduce the efficiency of the operations to be carried out such as field spraying and tillage. In this article, the dynamic behavior of a tractor is studied and the effects of possib le structural modifications on its dynamic behavior are examined. Using the expe rimental modal analysis technique, a modal model is derived (with a correlation coefficient ranging from 0.90 to 0.95 of the measured values) that contains the eigenfrequencies and mode shapes of the machine. It is applied to predict the st ructural behavior of the machine under a set of excitation conditions. A frequen cy sensitivity analysis on the modal model gives information about the most crit ical locations on the structure with respect to local parameter changes. In a la ter stage, this is used to predict frequency shifts owing to structural modifica tions like local stiffness and inertia changes.
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