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Whole body vibration on helicopter pilot seat for two types of helicopters
Authors: Živković Dejan, Basarić Gradimir, Jovelić Stojan
Number of views: 267
The aim of the work was to measure the whole body vibration on helicopter pilot seats in two types of helicopters with jet engines and to accomplish the third octave analysis of whole body vibration acceleration in all three axes. The results of measurement on the first type of helicopters showed that the highest acceleration levels were in third octave band with the mid frequency of 16 Hz. The highest whole body vibration acceleration values were for the following regimes: the regime of levitation and the regime of horizontal flight with a speed of 250 km/h. The permissible exposure time periods for these acceleration levels were around 5 hours. The results of measurement on the second type of helicopters showed that the highest acceleration levels were in the third octave band with the mid frequency of 6,3 Hz. The highest whole body vibration acceleration values were for the following regimes: the regime of turning point and the regime of horizontal flight with a speed of 200 km/h. The permissible exposure time periods for these acceleration levels were around 3 hours. The acceleration levels in X or Y axes for both types of helicopters, in all regimes and all third octave bands, were very far below from the exposure levels for 24 hours. Since the pilots 'continuous exposure in the investigated regimes of flights is below these mentioned time periods, we can conclude that the whole body vibration levels do not have significant effects on the pilots' working ability.