The Longitudinal Stability Research Of Trimaran With T-foil And Flap

Since the beginning of the 21 st century,China’s maritime sovereignty has been continuously violated by other countries,especially in the South China Sea region and Southeast Asian countries competing for maritime competition.Other powerful countries have continued to demonstrate in China’s territorial waters.Therefore,it is imperative to build a maritime military The country is also gradually developing our navy.The maritime armament facilities are constantly being developed and updated.However,the most basic is the development of military ships.It requires a group of high-speed,high-performance military ships to adapt to complex sea conditions,and even the ability to launch weapons at sea.It has stability,which shows the importance of high-performance ships.As a new type of ship at high speed,the trimaran can be used not only in the civilian area but also in the military field.The special characteristics of its hull structure make Its ability to adapt to complex sea conditions and cope with complex marine environments,especially for the design of the trimaran’s control system,is the basis for the high performance of the trimaran.The hull of the high-speed trimaran is slender,and the middle and rear sections of the ship have a wide deck area,which can not only store cargo but also larger transport aircraft.In terms of performance,it is precisely because of the hull characteristics of the trimaran that The trimming effect of the trimaran on the waves is not large,which causes the trimaran to experience the most important problem when traveling at high speed.The longitudinal movement of the trimaran on the trimaran affects the stability and speed Therefore,solving this problem has become the fundamental purpose of researching high-speed trimarans.According to the commonly used ship anti-rolling attachment,the combined action of the T-wing and the wave pressure plate is used to reduce the longitudinal movement of the trimaran,but the T-wing There is a coupling relationship between the combined effect of the pressure wave plate and the controller,which makes it difficult for the controller to control the anti-rolling appendage,and usually we use the control to obtain the heave displacement and pitch angle of the trimaran The angle of the T-wing and the wave pressure plate causes the lag of the tracking effect.Therefore,the method adopted in this article is to control the T-wing and the wave pressure plate by using the heave speed and pitch angular velocity.In this way,the longitudinal movement trend of the trimaran is controlled in real time.This paper mainly studies the longitudinal movement of high-speed trimaran when encountering random waves.First,by establishing a mathematical model of the trimaran,analyzing the characteristics of the random waves,and finally obtaining a mathematical model of the trimaran’s longitudinal movement.The related software gets the hydrodynamic coefficient of the trimaran.Based on this,this paper introduces the Kalman filter theory,performs Kalman filtering on the data of the heave sensor,acceleration sensor and heading sensor on the high-speed trimaran,and then estimates the heave speed based on the heave displacement and heave acceleration.The collected data is mainly the heave velocity and pitch angular velocity as the input of the controller.The controller in this paper mainly obtains the resultant force and moment generated by the trimaran when the sea is exposed to the waves by the S-plane total force distribution PID algorithm,and then solves it to obtain the angle of attack of the T-shaped wing and the wave plate to control the trimaran And longitudinal tests of the trimaran model,and conducted regular wave experiments and irregular wave experiments,18 knots and 40 knots,third-level and fourth-level anti-rolling experiments.The analysis and processing of the data shows that the heave of the trimaran is reduced by 31.23% and the pitch is reduced by 40.55% under the condition of 40 knots in the fourth-class sea condition,which verifies the effectiveness of the algorithm.