| The author of this paper think that the range of application of hydraulic servo system is wider and wider with the development of hydraulic servo control technology, and some new characteristics appears Immediately. for example, the environment and mission are complicated, the influence to system of wider range of parameter variety,greater degree of external load interference and Cross link bonding appears; the Nonlinearity influence also exist, especially the influence of VRLA actuating unit Nonlinear Flow rate; high standard of bandwidth and dynamic static accuracy is needed to optimize the performance of the system; Computer control, digitization and discretization cause some new problems; how to reach the goals of simplifying the system and subunit construction through "software servo". According to the peculiarities, the following requirements is proposed about control policy of hydraulic servo:The strict Optimized design to acquire the static and dynamic accuracy of the system to the most degree without overshoot. Strong robustness should be presented in the control system, and it is to fit the ambiguity caused by time-varying, external load interference, cross link banding and non-linear factors; The control system should be more intelligent; Control law and control algorithm can be as simple and feasible as possible; The control system should be highly efficientA kind of numerical control hydraulic servo control system is presented and developed in the paper according to new demand of new environment to hydraulic servo control system strategy and through analyzing the advantages and disadvantages of the conditional hydraulic servo control system. in the same time, the following four aspects of system in the developing progress is analyzed.The structure and principle of numerical control hydraulic servo valve; The performance analysis of numerical control hydraulic servo cylinder; The precision analysis of numerical control hydraulic servo cylinder; The rapidity and stability of numerical control hydraulic servo cylinder.After the technology of numerical control hydraulic servo system designed by this paper is mature, we cooperate respectively with SHANGHAI HUIRU Machinery Manufacture Company and XIANYANG Fan Factory and apply the new technology into the speed control system transformation of machine tool and manufacturing of fan manufacturing equipmentThe result of analysis and application indicated that numerical control hydraulic servo system have three merits instead of traditional hydraulic servo system: small volume light weight small inertia high reliability big output power good rapidity; big stiffness(namely small influence of output displacement to outer loading) accurate location; high anti-pollution capacity easy to maintain and use; in addition, the kind of numerical control hydraulic servo system is used to reconstruct the speed-adjusting system of plane grinding machine. and simplified its control method and hydraulic system, increased its accuracy and efficiency. |
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