Reasearch On Optimization Design Method Of Multi-Functional Bearing/Heat Conducting Structure

The flatness accuracy of large SAR(Synthetic Aperture Radar)remote sensing satellite antenna arrays puts high design requirements on the load/heat conduction multifunctional structure design of the antenna reflection surface structure.The traditional honeycomb sandwich panel structure is difficult to meet the needs of multifunctional design.Based on the three-dimensional additive manufacturing The development of lattice structure provides new technical ideas for the optimized design of load-bearing/heat conduction multifunctional structure.This paper mainly adopts the research method of theoretical method research-design practice-simulation analysis,and uses the movable deformation component method(Moving Morphable Components,MMC)as the main research tool to carry out the following aspects of research:In terms of theoretical methods,on the one hand,according to the design requirements of minimizing temperature gradients,this paper proposes a new topological optimization model and optimization formula for the optimal heat transfer path of high thermal conductivity materials based on the MMC optimization framework,and at the same time completes with the thermal conduction finite element analysis The sensitivity formula of the objective function is deduced,and the correctness of the optimization model is verified by writing and running several optimization examples of heat source boundary examples;on the other hand,considering the mechanical bearing and heat conduction performance of the microscopic unit cells,this paper uses the microscopic unit cells The configuration is the research object,the unit cell force and thermal performance coupling are used as new optimization target parameters by weighting,the corresponding MMC topology optimization model and optimization formula are established,and the relevant sensitivity analysis is completed in conjunction with the homogenization method to obtain the force-heat coupling Unit cell configuration.At the level of design practice,combined with the research work of theoretical methods,according to the actual working conditions of the antenna reflection surface structure,the optimal heat transfer path of the high thermal conductivity material and the variable density based on the integrated unit cell configuration of force and heat are optimized and designed in the proportionally zoomed design domain.The lattice substrate structure,and the direct mapping design method is used to complete the three-dimensional model design of the load/heat conduction multifunctional variable density lattice sandwich structure,and the 3D printing preparation of the sample is completed at the same time.At the level of simulation analysis,this paper uses a comparative verification analysis method to compare the traditional dot matrix sandwich panel structure with the new variable density dot matrix sandwich panel structure designed in this subject.The array sandwich panel structure has more excellent bearing/heat conduction performance.