System and method for producing motion

This disclosure is directed to novel systems and methods for producing motion in response to a drive signal where the motion has a smooth translational reversal. The system accepts a command position signal and compares the command position signal to the actual position of a linear actuator to develop a position error that is then conditioned to produce a pair of valve drive signals that command series connected proportional valves that supply the linear actuator from a common connection of the valves with fluid flow and pressure to adjust the position of the linear actuator so as to reduce the position error by imparting motion to the linear actuator, thus imparting motion to a load. The conditioning of the valve drive signals includes the processing of the position error and the application of a quiescent drive signal to develop or nearly develop a quiescent fluid flow through the series connected valves. The quiescent drive signal can be automatically or manually developed. If gravitational force or other forces sufficient to return fluid from the translational driver, only one pair of proportional valves are needed. If the translational driver must be driven in both directions then two pairs of proportional valves are needed and are connected such that each set can produce motion in opposition directions. The system may be embodied as a driving simulation motion apparatus for entertainment or training purposes.