Feed-forward Compensation Decoupling Control Research On The Electro-hydraulic Load Simulator Of Fin Stabilizer

The electro-hydraulic load simulator of fin stabilizer is the equipment which simulates hydrodynamic force exerted on the fin stabilizer under laboratory conditions when the fin moves .It is the typical passive electro-hydraulic force control system .It mainly includes two parts—loading system and driving system .When the Loading system works it must move following driving system under work. Therefore, the force flux will come into being when the fin stabilizer moves initiatively .The change of flux brings out the change of pressure without fail .The surplus force comes into being following this .The surplus force is the main element which impacts the control performance and control precision of loading system .So it is necessary to eliminate surplus force. Synthesize numerous related literatures and reference materials home and abroad and analyze their advantage and disadvantage on eliminating surplus force. Contraposing characteristics of the fin stabilizer this dissertation adopts the control method of feed-forward compensation decoupling to eliminate the coupling between the loading system and the driving system. Accordingly, surplus will be eliminated.In this dissertation, the author builds up mathematical model of the electro-hydraulic load simulator of fin stabilizer, analyzes deeply its control performance in theory and researches the relation between configuration parameters and control performance. These supply the theory base for raising the performance of the electro-hydraulic load simulator of fin stabilizer. Further, starting with the dynamic and static characteristic of power components, obtain the mechanism and intrinsical characteristics of surplus force. Analyze the afiFect element of the surplus force and its affect for the control performance of the loading system. Therefore, there is a good guide for finding the effective method that eliminates surplus and raises control performance.Driving elements of fin stabilizer are designed and the simulation about characteristics of surplus force, loading system with or without disturbance, static or dynamic state is done. The relationship between the dynamic characteristics of servo valve and loading system's control performance, loading gradient and loading system's control performance is analyzed.This dissertation put forward the control method of feed-forward compensation decoupling. According to the simulate result, this control method is markedly effective in eliminating the affect that the surplus force bring out.