The Optimization And Analysis Of Layout For Non-uniform Honeycomb In The Spacecraft Payload Plate

In this dissertation,the method of the optimization of honeycomb non-uniform sandwich instrument panel is studied.The design method of uniform sandwich plate instrument is developed by changing the distribution of the non-uniform honeycomb sandwich structure.And the instrument panel's mechanical property is finally enhanced.Firstly,the equivalent method and the modeling method of honeycomb sa ndwich structure are determined by comparing and analyzing for a variety of commonly used honeycomb sandwich structure equivalent theory.On this basis,the FME model of the typical payload plate is established.The effects of regular-hexagon honeycomb-core shape,cover-layer thickness,honeycomb-sandwich-plate thickness and the mass of the instrument on dynamic properties of the typical payload plate are investigated.Then based on the equivalent honeycomb sandwich structure theories and finite element interpolation algorithm,an optimal method to non-uniform honeycomb sandwich structure is put forward,and its validity is verified.The optimal model of typical payload plate are established.It is aimed at increasing the base frequency by layout optimization to find the regularities of distribution of regular-hexagon honeycomb-core shape,cover-layer thickness and honeycomb-sandwich-plate thickness.Then,the influence of the mass of the instrument to the optimal result is analyzed.Finally,the FEM model of a satellite instrument panel is established.The layout of the regular-hexagon honeycomb-core shape parameters is iterativly optimized by dividing the instrument panel into several optimization areas.And the optimal result is get in two optimal cases which boundary conditions are clamped support and simply support.As a result,in these two optimal cases,the base frequency of the satellite instrument panel is 14.6% and 5.5% higher than before with its weight invariant by changing the layout of the regular-hexagon honeycomb-core shape parameters of the instrument panel.It can provide a reference to the improvement design of non-uniform satel ite instrument panel.