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Issue No. 02 - July-December (2008 vol. 1)
ISSN: 1939-1412
pp: 96-107
Hong Z. Tan , Purdue University, West Lafayette
Shuo Yang , Purdue University, West Lafayette
Zygmunt Pizlo , Purdue Purdue University, West Lafayette
Pietro Buttolo , Ford Motor Company, Dearborn
Matthew Johnston , Ford Motor Company, Dearborn
We report three experiments on manual detection of torque variations experienced through a rotary switch. The experiments were designed to investigate whether torque perception was determined by the spatial or by the temporal characteristics of the rotary switch. In Exp. I, manual detection thresholds of torque variation were measured with raised sinusoidal torque profiles that varied in spatial period from 2.8° to 180° per cycle. In Exp. II, the same was measured for torque profiles that varied in temporal frequency from 2 to 300 Hz. Exp. III was similar to Exp. 1 except that the participants were required to turn the rotary switch at two different speeds for each of seven spatially specified torque profiles (spatial period: 2.8° to 90° per cycle). A comparison of the thresholds obtained in Exp. III and those in Exps. I and II suggests that the detection of torque variations depends on the spatial, not temporal, specification of the torque profiles. Our results can potentially shed new light on the design and engineering specification of rotary switches.
User/Machine Systems, Haptic I/O, Perception and psychophysics

M. Johnston, H. Z. Tan, P. Buttolo, S. Yang and Z. Pizlo, "Manual Detection of Spatial and Temporal Torque Variation through a Rotary Switch," in IEEE Transactions on Haptics, vol. 1, no. , pp. 96-107, 2008.
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