Abstract: A process for controlling a gimballed motion base system substantially duplicating operator perceptions in a simulated vehicle. Such vehicles may include but not be limited to, aircraft, automobiles, boats, roller coasters, bob sleds, and futuristic space vehicles. The process includes: a subprocess accounting for an effect of yaw on a motion base arm, a full-G bias function and a limited-G bias function, a low-G bias function, improved computation of pitch and roll gimbal commands to negate artifacts, a negative-G process, allowing various yaw gimbal positions, allowing various cockpit orientations, and a yaw gimbal control process.A perceptual model based on empirically observed human response data predicts perceived pitch, roll, and yaw, and accounts for the fact that a Gy component of linear acceleration affects both roll and yaw perception.

Abstract: A process for controlling a gimballed motion base system substantially duplicating pilot perceptions in a simulated aircraft. The process includes: a subprocess accounting for an effect of yaw on a motion base arm, a full-G bias function and a limited-G bias function, a low-G bias function, improved computation of pitch and roll gimbal commands to negate artifacts, a negative-G algorithm, allowing various yaw gimbal positions, allowing various cockpit orientations, and a yaw gimbal control process.A perceptual model based on emperically observed human response data predicts perceived pitch, roll, and yaw, and accounts for the fact that a Gy component of linear acceleration affects both roll and yaw perception.

Abstract: A dynamic flight simulator control system for enhancing flight realism to a ilot with regard to his perception and response to the linear forces and angular motions generated by a gimballed force and motion platform at the end of a rotating arm. Flight commands generated by controls identical to those in a specified aircraft and operated by the pilot as if flying are converted to the forces and motions predetermined for the aircraft and translated into simulator command signals which regulate the angular velocity of the arm and the roll and pitch of the platform. The perceived angular motions for both the aircraft pilot and the simulator pilot are predicted by computers pre-programmed with mathematical models of their human angular sensor responses and any difference is minimized by iteratively adjusting coefficients in the simulator command signals for predetermined weighting factors based on the individual pilot's preference.

Abstract: A arterial blood velocity-to-volume flow rate converter, including a pair of function generators a computer, and a multiplier, is incorporated within a system to objectively measure by non-invasive means the blood volume flow rate to the head of an occupant in a rapidly accelerating vehicle, and take corrective measures to stabilize the vehicle when that flow falls below a preselected lower limit for a predetermined length of time. A conventional ultrasonic Doppler velocimeter determines the blood velocity, subsequently feeding a representative signal to pressure function generator. The output therefrom is then fed to a cross-sectional area signal generator which determines the time-varying area of the artery, a signal representing such being fed to the multiplier along with the velocity signal to compute the flow.

Abstract: A servo operated system for controlling pressurization of an aircraft pils anti-G suit during high energy maneuvers has a servo operated control valve and a feedback loop controller for minimizing pressure lag in the suit. The controller has dual modes of operation: one for normal flight conditions and one for combat flight conditions. The normal flight mode provides nominal G-protection while the combat mode provides faster response by prepressurizing the anti-G suit to a bias level and lowering the G-force threshold. While in the combat mode, the crewman may select an adjustable pulsating signal to be superimposed on the prepressurization level to obtain additional comfort. Alternatively, he may select a superimposed pulsating signal which is synchronized with his own heartbeat to reinforce the pumping action of the heart.

Abstract: A gravity protective system for pilots including a pressurized suit and a control system therefor for regulating the pressure in the suit in response to variations in acceleration along the thoracic axis of the pilot. Signals indicative of acceleration along the vertical axis of the aircraft and cosine function of the tilt angle of the pilot's seat are combined with a derivative function of their product to produce a control signal for regulating the air pressure within the suit. A threshold control limits regulation to acceleration above a predetermined level, and a feedback circuit from the suit ensures rapid response without oscillation.