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- W1901587472 abstract "Modem complex aerospace systems employ flight deckautomation to increase the efficiency and safety of systems whilereducing operator workload. However, too much automation can leadto overtrust, complacency, and a decrease in operator situationawareness. In an attempt to prevent these from occurring, theoperator and the automation often share responsibility forperforming tasks. The tasks allocated to each agent are rarelyfixed; instead, they can be dynamically re-allocated throughoutoperations based on the state of the operators, system, andenvironment. This thesis investigates how dynamic taskre-allocation has been implemented in operational aerospacesystems, and investigates the effect of control mode transitions onoperator flying performance, visual attention, mental workload, andsituation awareness through experimentation and simulation. Thisthesis reviews the dynamic task allocation literature and discussesthe ways in which the concept can be implemented. It highlightsadaptive automation, in which the dynamic re-allocation of tasks isinitiated by the automation in a manner that is adaptive - inresponse to the state of the operator, system, and environment -and workload-balancing - with the purpose of keeping the operatorin control as much as possible while remaining at a moderate levelof mental workload. Adaptive automation is enthusiasticallysupported in the literature; however, for reasons discussed, it hasnot been deployed in any operational civilian aerospace system. Inthe experiment, twelve subjects sat at a fixed-base lunar landingsimulator and initiated transitions between automatic and twomanual control modes. Visual fixations were recorded with an eyetracker, and subjects' mental workload and situation awareness weremeasured using the responses to a secondary two-choice responsetask and a tertiary task of verbal call-outs of the vehicle state,respectively. Subjects were found to re-allocate attentionaccording to the priority of tasks: during mode transitions fromautopilot to two-axis manual control the percent of total attentionon the attitude indicator (which was required for the primaryflying task) increased 14% while attention on instruments requiredfor the secondary and tertiary tasks decreased 5%. Subjects'conception of task priority appeared to be influenced byinstructions given during training and top-down and bottom-upproperties of the tasks and instrument displays. The attentionallocation was also affected by the frequency of control inputsrequired. The percent of attention on the attitude indicatordecreased up to 13% across mode transitions where the flying taskwas not re-allocated because the pitch guidance rate-of-changedecreased from -9 to 0 °/s throughout the trial. Consequently,fewer control inputs and less attention were necessary later in thetrial. An integrated human-vehicle model was developed to simulatehow operators allocate attention in the lunar landing task and theeffect this has on flying performance, mental workload, andsituation…" @default.
- W1901587472 created "2016-06-24" @default.
- W1901587472 creator A5066497668 @default.
- W1901587472 date "2015-01-01" @default.
- W1901587472 modified "2023-09-27" @default.
- W1901587472 title "Analyzing the effects of dynamic task allocation on human-automation system performance" @default.
- W1901587472 hasPublicationYear "2015" @default.
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