Abstract: A two degree-of-freedom parallel device for orienting or pointing an end effector with vibration suppression is described. The two end effector degrees-of-freedom are decoupled by connecting fast actuators to the effector by passive joints. The stiffness of the linkages and the high speed of the revolute and prismatic actuators employed permit the application of large feedback useful for disturbance rejection.

Abstract: A two degree-of-freedom parallel device for orienting or pointing an end effector with vibration suppression is described. The two end effector degrees-of-freedom are decoupled by connecting fast actuators to the effector by passive joints. The stiffness of the linkages and the high speed of the revolute and prismatic actuators employed permit the application of large feedback useful for disturbance rejection.

Abstract: A precision positioning device is provided. The precision positioning device comprises a precision measuring/vibration isolation mechanism. A first plate is provided with the precision measuring mean secured to the first plate. A second plate is secured to the first plate. A third plate is secured to the second plate with the first plate being positioned between the second plate and the third plate. A fourth plate is secured to the third plate with the second plate being positioned between the third plate and the fourth plate. An adjusting mechanism for adjusting the position of the first plate, the second plate, the third plate, and the fourth plate relative to each other.

Abstract: A precision positioning device is provided. The precision positioning device comprises a precision measuring/vibration isolation mechanism. A first plate is provided with the precision measuring mean secured to the first plate. A second plate is secured to the first plate. A third plate is secured to the second plate with the first plate being positioned between the second plate and the third plate. A fourth plate is secured to the third plate with the second plate being positioned between the third plate and the fourth plate. An adjusting mechanism for adjusting the position of the first plate, the second plate, the third plate, and the fourth plate relative to each other.

Abstract: An aircraft lift control system mounted on an aircraft is provided. The aircraft has at least one wing. The aircraft lift control system comprises an oscillating aero surface mounted to the aircraft wing. A resonant frame is connected to the oscillating aero surface. An actuator is mounted to the resonant frame wherein the sinusoidal force produced by the actuator on the resonant frame results in a resonant deformation in the resonant frame and resonant-sinusoidal displacement of the aero-surface.

Abstract: A method for measuring the position of a stepping motor by generating a signal representative of the back electromotive force induced by the rotor in the coils of the motor, and estimating the actual position of the rotor from the signal representative of the back electromotive force induced by the rotor.