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Abstract
The aim of the investigation was to compare physical measurements of vibrations transmitted through the driver's seat to operators of off-road forestry machines, with the driver's subjective evaluation of discomfort from vibration in different driving situations. Physical measurements and analyses were performed in accordance with ISO-standard 2631 and amendments (ISO/TC 108/SC4/N60). A total of 13 different vibration analysis methods were considered. The investigation consisted of seven studies. The machines were driven on five test tracks, each consisting of six to ten shorter intervals representing easy to moderately difficult terrain conditions. Subjective ratings correlated better with technical evaluations based on the two most dominant vibration directions or all three directions than with only the critical direction according to ISO 2631. Calculations based on vibration energy in the entire frequency range 1–80 Hz gave better correlation than calculations based on energy in the critical frequency band according to ISO 2631. The weighted sum of vector method gave the best correlation with subjective ratings. The correlation coefficient for this method was clearly higher than with the method recommended in ISO 2631, i.e. 1–3-octaveband critical direction and frequency.
