| Popis: |
The purpose of this study was to compare the biodynamic, subjective comfort, and occupant performance effects of a prototype active air bladder cushion, a prototype contoured rate-sensitive foam cushion, and a standard flat aircraft cushion during exposure to low level vibration. Methods: Subjects were exposed to 30 minutes of low level F-15 aircraft vibration for each seat pan cushion while performing the Multi-Attribute Task Battery in the laboratory. Following the exposure, the subjects completed a questionnaire and survey on subjective comfort and support. No clear trends were observed in performance. In general, all cushions showed similar results with respect to the subjective comfort of various body parts and the seat comfort and support ratings. There was an indication that the standard cushion was more firm than the prototypes. All cushions tended to be rated as too firm. This coincided with greater discomfort and less adequate support in the buttocks but adequate thighs/legs comfort and support. The transmissibility results indicated that the prototype cushions may provide beneficial dampening effects that could influence comfort and performance for exposures to higher level, higher frequency operational vibration. |
