Study On The Half-Objective Load Simulation Of Fin Stabilizer

The electro-hydraulic load simulation of fin stabilizer is a physical half-objective simulative system, based upon the electro-hydraulic load simulator of fin stabilizer, its function is to simulate, under laboratory conditions, different kinds of hydrodynamic force exerted on the fin stabilizer so as to detect technical performance index of the driving system of fin stabilizer. Thus the classical self-destructing all-objective experiment will be converted to half-objective forecasting experiment in laboratory to achieve the aims such as shortening lead time, saving developing funds, enhancing reliability and success proportion. Along with the development of sea national defense and ship industry, the electro-hydraulic load simulator of fin stabilizer with high performances is urgently demanded. Because the electro-hydraulic load simulator of fin stabilizer is a kind of typical passive electro-hydraulic force servo system, the large surplus force caused by strong disturbance of the fin stabilizer displacement seriously affects the static and dynamic performances of the electro-hydraulic load simulator. Now the key point is eliminated the surplus force and improved the static and dynamic performances of the electro-hydraulic load simulator.After synthesizing numerous related literatures and reference materials home and abroad, the development of domestic and oversea electro-hydraulic loading system is summarized, and the merit and shortcoming is analyzed. The studying direction is decided through comparing domestic products and overseas products. In this dissertation, the author builds up mathematical model of the electro-hydraulic load simulator of fin stabilizer, obtaining the mechanism and characteristics of surplus force through analyzing the mathematical model of the electro-hydraulic load simulator. The conclusion is obtained that the surplus force is influenced by speed and acceleration of the electro-hydraulic load simulator. used a pressure servo valve and a flow servo valve to control loading system is analyzed ,which this control scheme can bring the merit of the two kinds of servo valves into full play.The experimental system is build up in this dissertation, by which we proceed the experimental research aiming at two structure schemes which are electro-hydraulic load simulator controlled bysimulator. The conclusion is obtained that the surplus force is influenced by speed and acceleration of the electro-hydraulic load simulator, used a pressure servo valve and a flow servo valve to control loading system is analyzed .which this control scheme can bring the merit of the two kinds of servo valves into full play. 0The experimental system is build up in this dissertation, by which we proceed the experimental research aiming at two structure schemes which are electro-hydraulic load simulator controlled by single pressure servo valve control and loading platform controlled by pressure and flow servo valves separately. It receives static and dynamic performances of fin stabilizer, which can prove that the methods advanced in this dissertation is effective for improving the comprehensive control performances of the electro-hydraulic load simulator .