Research On Subsection Accuracy Compensation Prediction For Ship Cargo Hold Flat Structure And Application Technology

Precision control technology has gradually become one of the core competitiveness of modern shipbuilding enterprises.It is the key for modern shipbuilding enterprises to reduce production costs and improve production efficiency.The establishment of precision compensation and release system suitable for shipbuilding enterprises can significantly improve the level of precision control,reduce the total combination cutting correction rate and improve the use efficiency of cranes,The number of sections in the straight area of the ship’s cargo hold accounts for more than 70% of the whole ship.Therefore,studying the reasonable accuracy compensation value of the straight area of the cargo hold is of great significance to improve the overall construction quality and efficiency of the ship and reduce the construction cost.Combined with the actual situation of ship construction enterprises,through the collection of on-site first-line data and the application of various mathematical statistical methods,this thesis establishes the prediction model of compensation value in the straight area of cargo ship,puts forward the calculation and prediction method of compensation value addition based on different sections and different plate frame structures in the straight area of cargo hold,and applies it to the precision compensation design of new ships,Fully use uniform compensation instead of end compensation,verify the implementation effect of accuracy compensation prediction system through the collection and analysis of sectional construction size and total combined cutting correction data,and compile corresponding compensation addition and release calculation program,which improves the efficiency and standardization of accuracy design and improves the accuracy of accuracy design,The accuracy deviation caused by segment welding shrinkage and other factors is eliminated to a great extent,and the secondary correction workload of segment size in the final assembly process is reduced,so as to improve the ship construction efficiency and reduce the construction cost.The main research contents of this thesis include:1.The addition of cutter compensation and the estimation method of overall cutting qualification rate are formulated.Through the reliability analysis and sampling prediction theory in mathematical statistics,a method for predicting the overall cutting deviation according to the plate cutting sample data is proposed,and the research on the accuracy compensation of the cutting equipment is carried out.Different cutting compensation values are added to different cutting equipment,The influence of different cutting compensation values on the qualified rate of plate cutting is predicted.2.Research on Extraction of influencing factors for welding shrinkage compensation value.In this thesis,the influencing factors affecting the welding shrinkage value are extracted by the method of principal component analysis,and the new factors are transformed by the method of factor rotation to make it more convenient for practical interpretation.It effectively reduces the correlation coefficient between the influencing factors of welding shrinkage and avoids the problem of multicollinearity.3.The prediction model of welding shrinkage accuracy compensation value is established.Based on the multiple linear regression theory,the prediction model of the influence of welding shrinkage factors on the shrinkage value of different plate frames is established,and the prediction formula of welding shrinkage of plate frames in the straight area of cargo tank is formed,which provides a theoretical basis for the design of subsequent compensation value.4.Application and verification of compensation system.Based on the research results of this thesis,the accuracy design of a certain type of ship under construction is tried and verified.At the same time,in order to improve the design efficiency and standardization,the program of compensation system is developed based on VBA,including three modules: rapid calculation of compensation value,compensation database and compensation verification based on General Assembly closing cutting correction visualization,and good application results are obtained.The total combined cutting correction rate decreased by 14.6%.