engleski

Possibility of Determination of Daily Exposure to Vibration of Skidder Drivers Using Fleet Manager System

This paper describes an indirect method of determining exposure to vibration of skidder drivers using the Fleet Manager System. The hand-arm exposure of workers to vibration is expressed as energy equivalent A(8), which is determined by the procedure clearly described in the international standards ISO 5349-1-2001 and ISO 2631-1-1997. A(8) is a value that depends not only on the vibration level in certain operating procedures, but also on the duration of exposure (duration of each skidder working procedure). Research was done on the skidder Ecotrac 120V equipped with the Fleet Manager System (FMS). The role of the FMS is to measure engine speed and duration of a certain engine speed during the working day. The analysis of the working days was performed in the aim to connect skidder working elements (driving, winching, pulling out of winch rope, etc.) with engine speeds. Vibration on the steering wheel and seat of the skidder Ecotrac 120V was measured by vibrometer with triaxial accelerometer (Brüel and Kjaer 4447) at different engine speeds. The exposure to vibration of a skidder driver on a daily basis A(8) was calculated using data of the summarized durations at certain skidder engine speeds measured by the FMS and the measured level of vibrations at specific engine speeds.

vibrations; A(8); engine speed; Fleet Manager System; skidder

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