Study On Adaptive Backstepping Sliding Mode Control Of Fin Stabilizer

While ship sails on the sea, it will produce a variety of sway and roll due to theinfluences of wind, wave and flow. Roll is the most harmful to the ship, and finstabilizer is the most widely used anti-rolling device which is active. In case of the bigstorms and the high sea condition, the nonlinear factors of the ship rolling become moreand more obvious. The ship rolling mathematical model simulation is made in high seacondition in this paper, meanwhile the random wave disturbance model is introducedwhich causes interference to the ship and its control system, and the2-D irregularlong-crested wave Longuet-Higgins model is established based on spectrum analysis,and subsequently wave model simulation is made. On these basis, the sliding modecontrol algorithm is applied in the control system which has strong robustness.According to the sliding mode control, the buffeting phenomenon and the upper andlower bounds of the uncertain parameters exist in the system. For the uncertainnonlinear system of the ship fin stabilizer, the advantages of backstepping control andsliding mode control are combined, and adaptive control is led into the algorithm,simulation study of the system is made and compared in different high sea condition.The main content and innovation in this paper are as follows.①To analyze the force conditions on the ship rolling motion and model the shiplinear roll motion. Consider the nonlinear factors to establish the nonlinear roll motionmodel.②To research into the random wave simulation method, simulate the2-Dirregular long-crested wave Longuet-Higgins model.③For the uncertain nonlinear system of the ship fin stabilizer， design theadaptive backstepping sliding mode control to solve the problem of buffeting anduncertain upper and lower bounds of the parameters which exist in the sliding modecontrol for ship anti-rolling. simulation study of the system is made with the slidingmode control and the adaptive backstepping sliding mode control, compare the two indifferent high sea condition, statistical results show that the adaptive backsteppingsliding mode control can make the system achieve better rolling performance, fasterresponse speed, higher control precision and better robustness.④simulate the actual user interface of the fin stabilizer technology systems usingMatlab, to build a simulation user interface so that we can know the operation of the system functions at a glance, meanwhile you can visually obtain and verify whether thealgorithm is effective.