Electrically compensated electrohydraulic servo system with position related feedback loop

An electrically compensated electrohydraulic position control servosystem having a negative position feedback loop for controllably positioning a drive means said system comprising:

• a bridged-T network;
• a source of a reference signal;
• a summing junction connected between said source and said bridged-T to provide an error signal as an input signal to said bridged-T;
• a dynamic pressure feedback servovalve assembly comprising a servovalve having as an output a pair of hydraulic lines for connection to said drive means as supply and return lines thereof, a differential pressure transducer connected as a feedback loop between said lines in pressure communcation with the hydraulic flow area within each such line, and electric power means to position said servovalve;
• a lead-lag network connected between said bridged-T and said power means;
• and
• a position transducer connected in said position feedback loop between the output from said drive means and said summing junction;
• and
• means for delivering a control signal from the output of said lead-lag network to said servovalve assembly;
• whereby position reference signals from said source position said drive means in a lowly damped low gain system of enhanced stiffness and minimized overshoot.