Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/1444
Title: Human sensitivity to gearshift loads
Authors: Giacomin, J
Mackenzie, TJP
Keywords: Human perception;Weber fraction;Automobile;Gearshift
Issue Date: 2001
Publisher: Elsevier
Citation: International Journal of Industrial Ergonomics. 27: 187-195
Abstract: This 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.
URI: http://bura.brunel.ac.uk/handle/2438/1444
DOI: http://dx.doi.org/10.1016/S0169-8141(00)00049-4
Appears in Collections:Design
Dept of Design Research Papers

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