This paper introduces a new method of providing motion cues to a moving base six-degree-of-freedom flight simulator utilizing nonlinear filters. Coordinated adaptive filters, used to coordinate translational and rotational motion, are derived based on the method of continuous steepest descent, and the basic concept of the digital controllers used for the uncoordinated heave and yaw cues is also presented. The coordinated adaptive washout method is illustrated by an application in a six-degree-of-freedom fixed-base environment. Nomenclature: angular position break point, rad = aircraft body axis translational accelerations, m/sec 2 : angular velocity threshold, rad/sec : coefficient for position penalty in cost function, per sec 4 : angular velocity washout rate, rad/sec 2 : coefficient for velocity penally in cost function, per sec 2 : damping parameters for second-order translational washout, rad/sec : frequency parameters for second-order translational washout, rad/sec 2 : inertial axis translational acceleration commands, m/sec 2 : body axis longitudinal and lateral acceleration at motion simulator centroid location, m/sec 2 : body axis vertical acceleration (referenced about Ig) at motion simulator centroid location, m/sec 2 P,q,r PV,I;PV t = gravitational constant, m/sec 2 = longitudinal and lateral cost function = digital controller gain parameter 3 = longitudinal gain parameters ,3 = lateral gain parameters = body axis angular velocity commands, rad/sec = body axis aircraft angular velocities, rad/sec -longitudinal adaptive parameters = lateral adaptive parameters = time, sec -arbitrary time, set; = angular rate weighting coefficient, m 4 /rad 2 sec 2 -commanded inertial translational position of motion simulator, rn -commanded inertial angular position of motion simulator, rad = angular velocity input commands, rad/sec j = time when \j/ reaches breakpoint, A, sec T. IntroductionA NEW method of providing motion cues to a moving base six-degree-of-freedom flight simulation has been developed at Langley Research Center. The method, coordinated adaptive washout, is based on the idea of coordination of rotation and translation to obtain accurate longitudinal and lateral force cues in a manner similar to the work of Schmidt and Conrad. 1 ' 2 The major differences between the subject scheme and the work of Schmidt and ;|;A dot over a variable indicates the time derivitive of that variable.Downloaded by UNIVERSITY OF OKLAHOMA on February 4, 2015 | http://arc.aiaa.org |

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NASA Langley Research Center conducted flight tests at the Eagle County, Colorado airport to evaluate synthetic vision concepts. Three display concepts (size "A" head-down, size "X' head-down, and headup displays) and two texture concepts (photo, generic) were assessed for situation awareness and flight technical error I performance while making approaches to Runway 25 and Runway 07 and simulated engine-out Cottonwood 2 and KREMM departures. The results of the study confirm the retrofit capability of the HUD and Size "A" SVS concepts to significantly improve situation awareness and performance over current EFIS glass and non-glass instruments for difficult approaches in terrainchallenged environments.

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