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-- Alfred North Whitehead

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Brad Purvis

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Publications by Brad Purvis (bibliography)

1994

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Gawron, Valerie J., Smith, Scott, Joseph, Thomas, Turner, Aric and Purvis, Brad (1994): Challenges of Operationally Testing a Test and Evaluation Tool. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. p. 990.

“Two years ago, a need was identified to develop an integrated set of computer-based tools to support crewstation evaluation during flight test. In response to that need, the Test Planning, Analysis, and Evaluation System (Test PAES) was developed. During the development, almost 300 requirements were identified. In addition, the operational domain was expanded from flight test to both ground simulation and operational test in uninstrumented aircraft. The user population also expanded geographically. Finally, constraints of cost and use of current commercial-off-the-shelf (COTS) hardware and software were imposed. To meet these numerous and diverse needs, Test PAES took on numerous and diverse components including: 1) a computer system composed of COTS hardware and both COTS and custom software, 2) a set of databases, 3) two models: one to predict the effects of time delay on debrief data accuracy and the other to predict system performance in operational use, 4) a Structured Crewstation Evaluation Process (SCEP), and 5) Structured Test Procedures (STPs). How do you test such a complex system efficiently? How do you obtain the most useful data for basing decisions to modify the system? How do obtain user comments every time they have a comment? These questions and potential solutions were addressed in the poster.”

1987

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Wilson, Glenn F., Purvis, Brad, Skelly, June, Fullenkamp, Penny and Davis, Iris (1987): Physiological Data Used to Measure Pilot Workload in Actual Flight and Simulator Conditions. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 779-783.

“Three physiological measures of workload; heart rate, eye blink, and EEG were recorded from eight experienced A-7 attack aircraft pilots. Each pilot flew the same familiar training mission three times; one mission in the lead position of a four ship formation and the other as wing, and once in an A-7 simulator. The mission lasted approximately 90 minutes and consisted of take-off, low altitude terrain following, high G maneuvers, inflight navigational updates, weapons delivery, and a high altitude cruise to base, ending in a formation landing. The data show significant differences between simulated and actual flights for all measures. There were also significant differences between mission segments for each pilot. The heart rate data most obviously reflect the changes in workload level throughout the mission and between flight position and simulator. Blink rate and duration were sensitive to changing visual attentional demands. The EEG data showed differences between the actual flight missions and the simulator.”

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