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S. Keith Adams

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Publications by S. Keith Adams (bibliography)

1989

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Adams, S. Keith and Ma, Xianqiang (1989): Predictive Models of Hand Torque Strength for Circular Electric Connectors. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 737-741.

“Maintenance and its associated costs have become a serious problem for nearly all military and civilian organizations using aircraft and other complex hardware. This paper describes extensions of development work designed to provide basic elemental task configuration versus strength data for tightening and loosening circular electrical connectors by proposing a mathematical formulation of the problem, showing a model relating hand torque strength to specific task variables and dimensions, and giving the results of predictive tests in which predicted hand torque strength was compared against values obtained in a comprehensive statistically balanced set of hand torque strength tests. Results strongly support the theoretical basis and structure of the predictive model and indicate directions for refinement as more data are obtained in future applications.”

1988

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Adams, S. Keith and Ma, Xianqiang (1988): Hand-Grip Torque for Circular Electrical Connectors: The Effect of Obstructions. In: Proceedings of the Human Factors Society 32nd Annual Meeting 1988. pp. 642-646.

“The hand grips of 18 male and 16 female subjects were studied to determine the maximum, clockwise static torque that could be applied to circular electrical connectors under six defined levels of interference and four conditions of interference (types of obstruction) with and without work gloves. The diameters of connectors tested were 0.9, 1.5 and 2.0 in., respectively. Torque strength and required separation were found to be a function of level of interference, condition of interference, connector size, and glove usage. Interference from an adjacent surface to the right or below the grasped connector was less severe than interference from adjacent connectors to the left and right. The greatest interference occurred when adjacent connectors were located to the right, left, above and below the grasped connector. Large connectors permitted greater torque and required less surface-to-surface clearance than small connectors. The use of work gloves increased torque strength slightly but required much larger clearances. Limitations in hand torque strength and required clearances for exertions should be taken into account as ergonomic guidelines for maintainability.”

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