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在散热性能分析中,解析地给出了点阵夹芯结构的整体传热系数和等效压降,定义了散热性能指标.通过连续介质力学的方法和经典的层合理论,并通过串并联模型给出了碳纤维增强点阵夹芯结构整体的刚度特性.在满足既定的承载要求和一定的散热要求约束下,提出了一种对碳纤维增强点阵夹芯结构进行多功能优化设计的协同优化方法,在设计中采用了更符合工程实际的基于分枝定界法的混合离散优化方法,得到了夹芯结构质量函数的最小值,从而实现了轻质的目的.同时对不同结构形式的芯子做了相应的比较和分析,结果表明:金字塔型点阵夹芯结构在实现轻质的同时,具有较强的散热能力,而且承载能力更好,更为轻质高效.
In the analysis of thermal performance, the overall heat transfer coefficient and equivalent pressure drop of lattice sandwich structure are analytically given, and the thermal performance index is defined. Through the method of continuum mechanics and classical laminating theory, The model gives the stiffness characteristics of the whole carbon fiber reinforced lattice sandwich structure.Under the constraints of the established bearing requirements and certain heat dissipation requirements, a multi-functional optimal design of the carbon fiber reinforced lattice sandwich structure is proposed Method, a hybrid discrete optimization method based on branch and bound method that is more in line with engineering practice is adopted in the design, and the minimum value of the mass function of the sandwich structure is obtained, so as to achieve the purpose of light weight. Meanwhile, The results show that the pyramid dot matrix sandwich structure has the advantages of light weight, strong heat dissipation capacity, better carrying capacity and more light weight and high efficiency.