Ergonomic Evaluation Study of Occupant Function Allocation for Riot Vehicle Based on Task Load
With the development of intelligent equipment, the police riot vehicle (PRV) cabin space become smaller, but the mission demand does not reduce, but increase. At present, there is no mature unmanned technology, so the cabin designer has to reduce the number of occupants and redistribute occupant functions. In order to test the feasibility of the new system, the new scheme of occupant function allocation must be evaluated at first. This study proposes a multi-index evaluation method to the new PRV occupant function allocation solution based on task load. A semi-physical engineering simulator was built and ergonomic experiments that combined subjective and objective evaluation to the new occupant function allocation scheme were performed in the simulator. The experiment task was two typical mission profiles: one is the long-range target attack; another is the close-range target attack. The task load includes subjective and objective evaluation indexes. The evaluation questionnaire was designed based on the multi-resource theory that contained 5 channels: visual, auditory, cognitive, speech and movement and the workload of each channel was given with a subjective scale. The objective indexes consist of the main task performance, the sub-task performance of detection response task (DRT) and two physiological indexes of skin electricity and heart rate variability. The experimental results showed that the change of occupant numbers has an impact on the performance of different task stage. The result of the subjective evaluation showed that the total task workload score were highly related to the workload score of each channel of visual, cognitive and movement channel. The conclusion of this study can be made that the change of the occupant number has a greater impact on the occupant performance with an increased physical load within the acceptable range; The evaluation method based on task load is feasible in the semi-physical simulator environment. The study can provide theoretical support for the evaluation of the occupant assignment function in the new type of PRV.
KeywordsErgonomic evaluation Function allocation Mental workload
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