Dynamic Characteristic Analysis And Control Of Ship Large Section Hoisting System

With the continuous development of economic globalization,the gradual maturity of the concept of green ships,the gradual growth of marine economic industry,the sharp intensification of marine market competition,the continuous progress of shipbuilding technology and the continuous rise of fuel prices,various reasons have led to the continuous development of ships towards the trend of large-scale.At the same time,with the continuous progress of China’s manufacturing capacity and the continuous upgrading of lifting equipment,it can support the lifting operation of the ship in a larger integrated section during the construction process.In the process of ship large section hoisting,due to the large mass of the ship section itself,the inertial force and centrifugal force generated by the acceleration and deceleration of the crane trolley and the wind load on the shore will cause a large swing angle of the hoisting load,which will greatly affect the working efficiency and safety of the hoisting process.At the same time,due to the weight of the ship large section,there are high requirements for the strength and reliability of the steel wire rope.Therefore,the simulation analysis of the dynamic response of the ship’s large section hoisting system,the anti swing control of the hoisting load swing angle,and the strength safety analysis of the steel wire rope are of great significance to the efficiency and safety of the large section hoisting process.This paper takes the quayside gantry crane as the research object.Firstly,the fluctuating wind on the bank is studied,the average wind load and fluctuating wind load are obtained,the basic parameters of steel wire rope are determined according to the lifting conditions,and the dynamic mathematical model of hoisting system is obtained by Lagrange method.According to the mathematical model,the dynamic model of ship large section hoisting is established in ADAMS,the scale experimental platform is designed to verify the simulation model,and the influence laws of different factors on the dynamic response of the hoisting system are obtained according to the experimental phenomena.Then,the dynamic response cur ves of large section hoisting under four working conditions are obtained through Adams dynamic simulation.In order to ensure the stability of the system,a composite dynamic vibration absorber is designed.In order to reduce the swing angle of the hoisting system,based on the Adams dynamic model,using the joint simulation of Adams and Simulink,PID controller and fuzzy PID controller are designed respectively for three hoisting conditions,and good anti swing effect and anti impact ability are achieved.Then,in order to ensure that the steel wire rope meets the work safety requirements,the strength of the steel wire rope is analyzed.Firstly,the three-dimensional model of steel wire rope is established,and the stress results of steady-state simulation analysis are compared with the calculated values of literature formula to verify the correctness of steel wire rope model.Through the transient analysis of steel wire rope,the stress nephogram distribution and safety factor curve of steel wire rope are obtained,and the safe use number of steel wire rope in the hoisting system is determined in this paper.