| The major objective of this research was to design and develop future low profile operating spaces and chair configurations of a gunner station and then to determine by testing its minimum and optimum sizes and their affects on tracking performance.;The research methodology included graphic analysis, by manipulating two 5th and 95th percentile manikins, of current operating postures, choosing best from within a range of postures, constructing a suitable and flexible mock-up, experimental testing using thirty male subjects from within the larger population in stature and weight, analyzing the data and drawing the conclusions. The testing included recording of panel positions fitted around subject's body prior to tracking. Fitting trials determined comfort, measurement of X, Y and XY tracking error components acquisition time and number of body contacts with surrounding space walls were also included.;The chair was made of four adjustable panels and a headrest. The thigh, ischium, lumbar and thoracic panels were hinged together allowing a total back reclining angle range from 105(DEGREES) to 130(DEGREES).;The results of testing indicated that minimum space depth and height were 45.24" to 52.18" and 37.89" to 44.42" for the reclining chair angles 105(DEGREES) to 130(DEGREES) respectively. Fitted space widths were 29" to 40.25" for the optimum and 16.48" to 30.73" for the minimum. No significant affects were found from changing space widths or chair angle on X tracking error component and acquisition time. Space width affected Y and XY tracking error components. Wall bumps were affected by space width in all cases and chair angle in some. Right arm was more efficient and bumps reached a high average greater than 400 contacts per ten second trial in 18" wide spaces. Space widths determined by bumps were smaller than by comfort rating. And last, space profile height was reduced by 11.08". |
