Research And Implementation On Force Load System Of Ship Steer Gear

The main function of the load system used for ship is to simulate different kinds of loads exerting on the helm under laboratory conditions in order to check whether the performance of the helm can meet the design requirement. Thus the classical all-objective experiment will be converted into half-objective forecasting experiment in laboratory to achieve the aims such as shorting developing time, saving developing funds, enhancing reliability and success proportion.Beginning with the overall design, the dissertation has established isosceles triangle load mode via the comparisons of distinct load projects, designed the hydraulic servo system and chosen the hydraulic components utilizing high response servo valve to control hydraulic cylinder with differential control mode which has the advantage of safe load and little press fluctuation, and also developed hardware and software of control system. The software is organized according to orient–object programmer based on real-time system Vxworks with well readability and real-time.The force load system for helm is a typical passive electro-hydraulic force servo system and the movement of helm is considered as interfering with the load system. The control effect of force load system has been simulated from naught interfering and interfering aspects. In naught interfering condition, the different influence on dynamic performance of load system among diverse filter end frequencies has been compared to conclude the best of filter circuit for the system. And then in interfering condition, the elimination of extraneous force is analyzed and the traditional velocity synchro-compensation method is used. The result of simulation proves that this method can preferably eliminate the extraneous force. The fact that the extraneous force is related to not only the actuator velocity but also its acceleration and differential of its acceleration decide the method can't eliminate the extraneous force completely.The experimental results show that the mechanical performance of the force load system can meet the design requirement and the better scheme for improving dynamic performance of system is brought forward.