Abstract
This paper suggests action cost as a better parameter to analyse human factors. Vertical load lifting in sagittal plane has been studied extensively with different models and are available in literatures (Chaffin, 1982 Helander 1996). In this paper a specific load of given dimension is considered and is lifted from ground to a table of waist height. Five different paths of lifting are considered using a manikin model of a particular stature, avoiding interference of the load with the body. The task time for lifting the load from initial to final state is the same (5.5 sec) for all the paths. Static equilibrium is assumed to be maintained at all the configurations to calculate moments at different joints. Action is defined as the cumulative work being done by one subject over the task duration time and is measured from the area under the cumulative work-time plot. The action involved in performing the task in different paths is taken as the cost function for the analysis.
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