Quantitative Evaluation Of Personnel Mental Workload For Aviation Task Interface

At present,with the improvement of flight informatization and intelligence,the pilot is gradually transformed into a supervisor in the increasingly frequent human-machine interaction system,and monitoring the flight status information has become the main task.Therefore,it is of great significance to evaluate the mental workload state of operators based on the information display and control interface of aviation task,and to identify and predict the invalid mental workload of operators in advance,which is of great significance for reducing human-induced accidents in flight.There are few existing studies on the evaluation of mental workload based on the aviation task interface,and the evaluation methods are mainly subjective evaluation method and physiological measurement method.In view of the above problems,this study combined the aviation flight task interface and used the model to quantitatively evaluate the mental workload of personnel,so as to realize the identification and prediction of the mental workload state of personnel.This paper first combines the Cognitive Task Load(CTL)model from the perspective of cognitive theory,and selects the MATB task interface as the main carrier for pilots to perform aviation flight tasks,mainly aiming at the human-machine interface tasks under different typical tasks.Including the system monitoring task,the tracking monitoring task,the communication monitoring task,and the resource management task,and do corresponding verification tests to quantify the mental workload of the personnel.Secondly,a quantitative evaluation model of mental workload based on Task Demand Workload(TDL)and Staff Workload Capacity(SWC)was proposed.According to TDL and SWC,the concept of residual mental workload was proposed,and the experimental verification was carried out by applying the MATB mission flight display interface.In this paper,the method of information entropy was used to quantify the information display and control interface of MATB flight,which completed the evaluation of the complexity of the display interface and applies it to the TDL and SWC models,which has certain innovation and application value.Finally,15 participants were recruited to verify the validity of the model by evaluating their mental workload status under different task levels designed by the MATB task interface and comparing with the results of the NASA-TLX scale.The evaluation results of CTL model showed that the mental workload of personnel increased with the increase of task level,which was consistent with the evaluation results of NASA-TLX scale of personnel,which proved the validity and applicability of the model.The results of the TDL and SWC model showed that mental workload had a significant “U”-shaped effect with the increase of task level,which was consistent with previous studies,indicated that medium-load task load level was conducive to the improvement of task performance.Compared with traditional methods of mental workload evaluation,the quantitative evaluation model of mental workload constructed in this paper can realize real-time,quantitative and qualitative evaluation results,which provided a new idea for the quantitative evaluation of mental workload.Firstly,CTL model starts with complex task flow and adopted the time-line method,which can not only qualitatively judge the mental workload status of personnel,but also obtained quantitative evaluation results,which can provide a basis for the design of flight tasks and the allocation of complex human-machine functions.Secondly,the TDL and SWC model based on task interface information,combined with personnel performance level,finally identify and predict personnel mental workload level,which can provide a basis for establishing of optimal human-machine interface design and adaptive task assignment.