Whole-body vibration is a problem in off-road vehicles which can cause both injuries and discomfort. Comfort depends on several environmental factors of which the vibration level is one factor. This study focuses on 'vibration comfort' and is restricted to transient vibrations. ISO 2631 primarily addresses long-term effects due to continuous, whole-body vibrations. Guidelines about comfort are provided, however information regarding transient motions is limited. New criteria for measurements of vibration comfort are therefore of considerable value in the understanding of how to improve vibration comfort in vehicles. The aim of this study is to find a relationship between assessments of vibration comfort and measured vibration levels. A designed experiment based on the variables of vehicle speed, obstacle height and a load condition were carried out on a forklift truck. Response variables were discomfort assessments and measured accelerations in 4 degrees of freedom in the seat/driver and seat/cabin interface. Data from the subjective assessment of 11 professional drivers was collected. A questionnaire was used to control for background variables of importance such as driver's weight, age, experience and vibration-sensitivity. In case of individual results, the correlation coefficient between RMS-values in the z-direction and comfort-assessments was 0,54. Based on averages for each test condition, the correlation coefficient was 0,93. Further studies are in progress to assess if measurements of the rotational degree of freedom will improve the prediction of discomfort.
Discomfort from transient whole body vibrations
International Congress on Sound and Vibration, 7 ; 2469-2476
2000
8 Seiten, 11 Bilder, 1 Tabelle, 6 Quellen
Aufsatz (Konferenz)
Englisch
Discomfort from transient whole body vibrations
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