Tri-axial evaluation of the vibration transmitted to the operators of crawler compact loaders

Relevance to industry - This paper highlights the importance to review the standard configurations currently used on this kind of machines (cab and seat suspensions): they turn out to be absolutely ineffective to assure the operators of safe and comfortable working conditions. Compact loader manufacturers should consider the vibration problem at the machine design stage and choose cab suspension systems and seats able to reduce accelerations along the three different axes. Similarly, seat manufacturers should pay attention in reducing rolling and pitching effects using specific seat suspensions effective also along the horizontal and lateral directions. Unfortunately standards currently in force do not require to control horizontal and lateral vibrations. Consequently, the address of this issue at ISO level in order to update the current legislation could be a strong stimulus for seat and machine manufacturers and a progress towards the operator comfort.