Abstract: An amusement ride vehicle with motion controlled seating includes a chassis supporting a platform. Guests are transported through an amusement attraction in seating attached to the platform. Preferably, the guests ride in a chair having a hinged seat pan adapted to effect a bouncing motion or a chair adapted to effect a rocking motion. An actuator is advantageously provided to move the chair at a predetermined time. In a preferred embodiment, a triggering mechanism drops the seat pan from an inclined position to a declined position at a predetermined time, and a reset assembly returns the seat pan to the inclined position.

Abstract: The present invention provides a circuit for obtaining higher accuracy and total system response for complex mechanical impedance loads, such as earthquake simulators, and in particular to compensate for limitations in controlling the actual valve spool displacement and adequately stabilizing and controlling it at high frequencies. The improvement circuit includes a state variable filter to extend the band width of servovalve actuation frequencies by adding a lead compensation signal compensating for servovalve hydraulic responses. The output of the first filter circuit then in turn feeds a summing junction where the spool displacement feedback is provided, and the output of the summing junction or circuit is provided with the output from an additional filter which cleans up the signal by filtering out noise and insures that the phase of stabilizing signals is proper.

Abstract: A load dynamic compensation circuit for a servohydraulic control system for fixtures and specimens being tested operating in various degrees of freedom, for example in an environment to simulate earthquakes to test building specimens, or to provide road profile simulation for rail and automobile vehicles, or wind buffet loads for aircraft. A compensation circuitry compensates for specimen displacement disturbances in the control loop that are a function of the force exerted from the specimen and the acceleration of the test mass.