Badania zmienności drgań mechanicznych siodeł i poziomu dźwięku jako ergonomicznych parametrów ciągników rolniczych
AbstractThe object of the studies, performed in standardized conditions, was to investigate tractors and seats of the same type, both new and after different periods of utilization. The sound level in the cabs was measured while idling and in motion with an A correction filter and in octave bands. Accelerations of seats vibrations were measured in standardized measurement systems and on a vibration simulator. Variability in the studied ergonomic parameters was observed in both groups of objects (new and after different periods of utilization). Both noise levels and vibration accelerations are random in nature and are not correlated with the operational age. The results indicate that a decrease in seat quality during utilization is associated with an increase in lateral and longitudinal vibrations. The reason for these changes is wear of the elements that limit the movements of the seat versus the tractor body. Variability in the noise level is randomly associated with the number of engine revolutions, the transfer of drive to the wheels and the switching on of certain optional mechanisms, e.g. hydraulic pump and PTO, and also with the noise-insulation features of the cab. Variability in noise levels and mechanical vibrations implies variable exposure of the operators to the operation of these factors, which often approach the values of the acceptable standards. The use of single tests results, for example in certification procedures for a whole series of products, is thus related to a risk of error in the final evaluation regarding the fulfillment of ergonomic norms.
|Other language title versions||The variability in mechanical vibrations of seats and in noise levels as ergonomic parameters of farm tractors|
|Publisher||Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie, MNiSW |
|Publishing place (Publisher address)||Kraków|
|Book series /Journal (in case of Journal special issue)||Zeszyty Naukowe Akademii Rolniczej im. H. Kołłątaja w Krakowie. Rozprawy, ISSN 1233-4189, (0 pkt)|
|Publication size in sheets||5.7|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.