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  • Henry Rife Jex
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    Wall of Honor Level:
    Air and Space Friend

    Honored by:

    HENRY R. JEX, Consultant, Jex Enterprises, Santa Monica, CA 90402
    Formerly Chief Scientist, Systems Technology, Inc., Hawthorne, CA 90250

    Member/Awards
    AIAA (Associate Fellow); Human Factors Society (Lifetime Fellow); Institute for Advancement of Engineering (Elected Fellow); and Low Speed Aerodynamics Research Association. Registered Professional Engineer, Control Systems Branch, State of California. Awarded 1980 Franklin V. Taylor Award by the American Psychological Association for advances in engineering psychology.

    Academic Background
    * BSc, Aeronautical Engineering, Massachusetts Institute of Technology, 1951.
    * MSc, Aeronautical Engineering, California Institute of Technology, 1953.
    * Miscellaneous courses in Automatic Control, Space Technology, Biologic Communication, Hypersonic Aerodynamics, and Artificial Intelligence at UCLA, 1954-present.
    * Member Tau Beta Pi and Gamma Alpha Rho honor societies.

    Professional Experience
    Since 1953 Mr. Jex's professional experience has been devoted to all aspects
    of aerodynamic design, flight control integration and man-machine dynamics, including the conception, development, and testing of aircraft employing minimal flight control systems, tailored airframe characteristics, and novel control surface arrangements. Mr. Jex is experienced with wind tunnel testing at a wide range of facilities from subsonic to supersonic, and he has done extensive flight and dynamic testing of aircraft, spacecraft, airships and underwater vehicles.

    His accomplishments include:
    * Establishing mathematical models for man-machine dynamics.
    * Development of a "critical tracking task" for measuring operator skill.
    * Theory and experiments on manual control displays.
    * Research on human homeostatic stress and stability.
    * He tested the above with advanced simulations, and applied the results to practical vehicular piloting problems, such as:
    o Vehicle handling
    o Pilot induced oscillations (PIO)
    o Orbital rendezvous
    o Manned rocket boosters.
    * As consultant to AeroViroment, Inc., Mr. Jex did the control system design analysis for:
    * The successful Gossamer Condor and Gossamer Albatross human-powered aircraft.
    * The Smithsonian Institution's "Quetzalcoatlus northropi” robotic pterodactyl project.

    Other projects include: preliminary design for a variable stability airborne simulator, dynamics of buoyant vehicles, studies on terrain avoidance, gust alleviation, elastic mode suppression, and homing missiles. His work in vehicle dynamics covers automobiles, surface effect machines, spacecraft boosters, and re-entry vehicles. He conducted major programs on the motion effects on crewmen in Surface Effect Ships, motion-cue effects in simulators, ride-qualities of a variety of vehicles, the dynamics of kinetosis, and vibration effects. At STI he directed the Lighter-Than-Air craft simulation project, "LTASIM," and the Steerable Parachute simulation "CHUTESIM."

    He directed research on the effects of alcohol and drugs on operator performance and visual perception leading to the commercially successful Factor-1000 fleet-driver screening system.

    He designed a Highway-Driving Research Simulator facility, and a five-unit Vehicle Crosswind Conorator. He has completed preliminary work on an Artificial Intelligence type expert system for use in analyzing vehicular control by human operators.

    Mr. Jex investigated the manual control problems of the DynaSoar skip-glider, a manual control system for the Saturn V booster, an orbital rendezvous system for Apollo, and re-entry and landing for the Space Shuttle. He provided consulting help on the Pegasus booster control system, thrust/shockwave control interactions, and the propulsion dynamics for the National Aerospace Plane.

    He has been an invited lecturer or delegate to several government, academic, or international organizations in the areas of man-machine dynamics, bio-dynamics, ride-qualities, mental workload and impaired drivers. He has published dozens of papers and monographs in various Journals, Conference Proceedings, and books.

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