| Composite materials have been widely used in the fields of astronautics and aerospace. Honeycomb sandwich constructions is a kind of special composite materials, they are widely used in light-weight construction especially in aerospace industries because of their high strength-to-weigh and stiffness-to-weight ratios. With widely used in relative fields, the performance of the honeycomb sandwich structure is increasingly prominent. The results of their performance parameters are required to be increasingly accurate. At this point, hexagonal cells honeycomb sandwich structure is studied in this paper. A systematic analysis for the honeycomb sandwich structure, including the present situation and development trend at home and abroad is reported. According to the equivalent linear elastic modulus, a preliminary study is conducted for the natural frequency and the critical load of the honeycomb sandwich panels, i.e. analyzing the changes of the natural frequency and critical load, all of which provides an important basis for the results of the optimal design for honeycomb sandwich plate vibration parameters.Attention is concentrated as follows:(1) Combining with the present study situation and study results at home and abroad, sum up the structure characteristics of honeycomb sandwich plate vibration, and using the third-order shear deformation plate theory (TSDPT) analyze honeycomb sandwich panels;(2) According to mechanical properties of the honeycomb sandwich, figure out the equivalent elastic modulus of the honeycomb sandwich. As the third-order shear deformation plate theory (TSDPT) of shear stress along the plate thickness discontinuous, so using date of finite element update the shear modulus of the third-order shear deformation plate theory (TSDPT), and using the third-order shear deformation plate theory (TSDPT) analyze the bending and vibration of the honeycomb sandwich panels;(3) According to the optimal design rules of the honeycomb sandwich panels structure, objective functions of optimal design which are the shear strength, bending stiffness and bending strength, quality, number of honeycomb cells, first order natural frequency and critical load, are analyzed; (4) Identify constraints and variables of the optimal design, and construct the evaluation function;(5) Using Visual C++ Language achieve the honeycomb sandwich plate vibration optimal design functions. |
