FEM And Multi-objective Optimization Of Light Sandwich Structures

Honeycomb sandwich structures have been widely used in the fields of astronautics and aerospace, especially in Satellite structure. Periodic truss-core sandwich plates have recently been investigated for their lightweight and multi-functional characteristics such as ultra-light, high comparing stiff and strength, shock resistance, thermal resistance, sound insulation and electromagnetic shielding. Recent developments in the manufacturing techniques appear to heighten the interest in such panels, and these are considered as the most perspective and novel ultra-light materials combined with specific strength and multi-functions.In this paper the finite element models of honeycomb sandwich structures and Periodic truss-core sandwich plates were built, and were calculated using the finite element software. Then solve the multi-objective optimization using the result with the weight and other functional target as the object.This paper includes five chapters, as briefly reviewed follow:In chapter 1, background of this paper, with the review of literature is introduced. The emphasis is put on introducing some representative jobs in this field in the foreign countries and domestic research, including, theoretical methods, static and dynamic experiment, multi-functional characteristic and the optimization of the Honeycomb sandwich structures and Periodic truss-core sandwich plates, after that, FEM and ANSYS software are introduced too. Finally, the research of this paper is proposed based on the above.In chapter 2, some general multi-objectives optimization problems and solutions are discussed. And then, classical multi-objective optimization and general genetic algorithm are introduced. Nondominated Sorting Genetic Algorithm(NSGA) and Nondominated Sorting Genetic Algorithm II (NSGA- II) are introduced especially.Chapter 3, the manufacturing, structural mechanical properties and computational method of honeycomb sandwich structures and periodic truss-core sandwich plates are presented. Then the simple examples are presented.Chapter 4, the numerical examples of multi-objectives optimization are presented.Chapter 5 gives a summary of this thesis and some possible future work with reference to this paper.This thesis is supported by the National Natural Science Foundation of China under Grant 10590354,10572031.