Research On Structure Optimization Design And Simulation Analysis Of Ship Anchor Winch

With the rapid development of the shipping industry all over the world,the tonnage of ships is becoming larger and larger,the deadweight has also increased,so the largescale ships will become an important trend for the future development.As an important equipment in the ship deck machinery,the anchor winch is the guarantee of safe and reliable navigation for the ship.However,due to the lack of accurate calculation in the design process of anchor winch,the weight of some structures of anchor winch is too large,and the theoretical bearing capacity is much larger than the actual load.Therefore,this paper is based on the modeling,force analysis,finite element analysis and lightweight research of the anchor winch reel and frame in the context of reading a large amount of literature,and the main research contents of the paper are as follows:(1)In order to illustrate the problem that the reel and frame designed by the traditional method have certain optimization space,a strength calibration study of the reel and frame based on theoretical load calculation and finite element method was carried out.The magnitude and law of the load on the barrel shell under single layer winding were obtained by theoretical analysis,which illustrated the negligible stress magnitude after three turns of the cable winding.The results of theoretical calculations were used as loads for the static analysis of the reel and frame under rated and supported loads,which showed that the maximum equivalent stresses of the reel and frame were much smaller than the allowable stresses of the material,and there was some room for optimization.(2)A lightweighting study was conducted to address the problem of excessive weight of anchor winch reels.The central composite design method and multi-objective genetic algorithm(MOGA)were combined to improve the accuracy of the multiobjective optimized design results of the reel.An optimization model was designed with the reel weight as the target variable and the barrel shell thickness,left side plate thickness and right side plate thickness as the design variables,and multi-objective iterative solution calculations were carried out.The overall weight of the reel was reduced,and the weight of the reel was reduced by 7.38% under the premise that the equivalent force and displacement deformation meet the requirements.(3)A lightweighting study was conducted to address the problem of excessive weight of the anchor stranding machine frame.The topology optimization and dimensional optimization models of the frame were established.The preliminary design of frame shape optimization based on the topology optimization theory was carried out,and the size optimization design of the frame was carried out using the orthogonal test method and the response surface method respectively,and the scope of application of the two size optimization methods was illustrated.The weight of the rack was reduced by stepwise optimization design,and the weight of the rack was reduced by 15.27%under the premise that the equivalent force and displacement deformation meet the requirements.(4)In order to verify the reliability and accuracy of the reel and frame models after the lightweight design of this paper,stability and dynamic characteristics studies were conducted.Several methods to check the stability of the reel by theoretical calculation are summarized,and the feasibility of checking the stability of the reel based on the finite element method is verified,which illustrates the problem that the traditional method is too conservative to check the reel.The deformation and displacement of the reel and frame at low and peak frequencies are solved respectively,which shows that the lightweighting method in this paper can realize the lightweight design of the reel and frame,and provides ideas and directions for the lightweighting research of the structural body.