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dc.contributor.authorGiacomin, J-
dc.contributor.authorMackenzie, TJP-
dc.identifier.citationInternational Journal of Industrial Ergonomics. 27: 187-195en
dc.description.abstractThis paper describes an investigation of the ability of humans to distinguish different levels of gearlever load. A test rig with a forward-backward moving gearshift lever was constructed using the typical interior dimensions of European B segment automobiles. The rig used a system of weights and pulleys to provide a load which could be varied in steps of 1%. Four reference loads were chosen which were considered representative of automotive gearshift operation: 0.5, 1.0, 2.0 and 5.0 kg. Twenty subjects took part in the study. Using a variation on the psychophysical method of limits, the subjects were asked to respond whether a test load was heavier or lighter than a reference load. The Weber Fraction was found to decrease monotonically from a value of 0.036 for the 0.5 kg reference load to a value of 0.029 at the 5.0 kg reference load. The average value across all reference loads was 0.032. Measurements of the gearshift force made by means of a knob containing a load cell suggested that the variation in the measured Weber Fraction might be attributable to the time behaviour of the force exchanged between the human subject and the control surface.en
dc.format.extent523678 bytes-
dc.subjectHuman perceptionen
dc.subjectWeber fractionen
dc.titleHuman sensitivity to gearshift loadsen
dc.typeResearch Paperen
Appears in Collections:Design
Brunel Design School Research Papers

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