Design and simulation of control system for hydraulic ship steering gear

To solve the problem of large volume,poor location accuracy and complex controlling system existing in the existing ship steering gears. The working principle of the ship steering gear was firstly researched in this paper. Then a hydraulic ship steering gear controlling system was designed which includes an actuator, a drive system and controlling system. The controlling units include input element,proportioning element,valve element and feedback element of rotor angle. The transfer functions for the above elements and the whole system were presented and steady-state error model as well. Adaptive PID control was adopted to simulate the designed controlling system in the Simulink of Matlab. The simulation results show that the steady- state error of the system is 0. 021. The response time for a step-function signal is 0. 4s which indicates that the designed control system for hydraulic ship steering gear has the advantages of quick response and following performance. The designed system is satisfied with the the actual demands.