The Structure Optimization Of Heated Mandrel Winding Mandrel Based On Surrogate Model And Genetic Algorithm

The thermosetting composite material heated mandrel winding process is a new kind of composite material manufacturing method.The method developed on the basis of the traditional external curing process.The method can realize the winding and curing synchronously,the equipment footprint is reduced.Taking use of this method can improve production efficiency and reduce production costs.When the fiberglass winding,the high-temperature steam flow into the mandrel and heating the mandrel at the same time.The heated mandrel winding process is more efficient in forming composite products,and has low scrap and defective rate.Currently,this kind of technology is widely used in high-end composite products production line.The emergence of heated mandrel winding method makes the composite material molding technology has been greatly improved,but in the actual production there are still exist many problems.For example,the winding mandrel is a cylindrical metal tube.When the high temperature steam flows from one end of the mandrel to the other,the axial temperature of the mandrel can easily generate a large temperature gradient.When the temperature field is not uniform,part of the composite pipe products are prone to incomplete curing,thus affecting the quality of composite products.The distribution of axial temperature field of mandrel is affected by the structure of mandrel.In order to solve the above problems,this paper focuses on the optimization of the structure of the core mold,and designs the structure to optimize the temperature field of the core surface.This paper studied the principle of the heated mandrel winding.The physical properties of the steam and the mathematical model of the steam flow and heat transfer process are successfully constructed.The numerical simulation of the heating process of the core mold steam is carried out by means of the software Fluent,a kind of computational fluid dynamics software.The design of the test plan was carried out according to the response surface method,using the software Minitab,and it was used to determine the experimental factors and the factor levels.The model was modeled by Box-Behnken design scheme,then meshing and going numerical simulation.The temperature tracking point is set on the outer surface of the mandrel,the temperature data is read,the standard deviation of the outer surface temperature of the core mold is calculated as the test response value,and then the relationship between the temperature uniformity of outer surface and its internal structural parameters is fitted the Second-order response surface model.Finally,GAOT is used to find out the optimal combination of structural parameters.Based on the optimal combination of structural parameters,the numerical simulation is carried out again to verify the correctness of the proposed scheme.The results show that the deviation between experimental value and fitting value is small,under the optimum structure parameters,the standard deviation of mandrel surface temperature is very small,the surface temperature uniformity of mandrel is benign,the structure of mandrel is optimized,and it can provide the theoretical guidance for practical production.