Based On The Structure Of The Ansys Finite Element Analysis

Based on finite element analysis method and the CAD drawing, established the finite element model of DAP box which belongs to the DREAM and done the modal analysis of this DAP box. The result shows that the first-order natural frequency of this DAP box is 500.45Hz, this value is much larger than the requesting frequency which is only 100Hz, this result provide the proof for the safety of DAP and also proved that the DAP box can be optimized a lot.Based on the result of modal analysis of DAP box, optimized the thickness of the board of DAP and the areas of the strengthening-rib of DAP box. The aim of this optimization is to reduce the weight of the DAP box and the restriction is the shape and the size of DAP box. The result shows that the natural frequency of DAP box descends as the thickness of board descend, and also the frequency descends as the areas of strengthening-rib of DAP box descend. When the thickness of board is 1mm, and the areas of all strengthening-rib is 1(1×1)mm2,the natural frequency is 161.40Hz(>100Hz), this is the optimized result which is acceptable. The weight of the box is descend from 1.653kg to 0.44kg, optimized 73.4%.Furthermore, calculated the material parameter of carbon fiber-aluminum honeycomb complex material and calculated the thermal-stress of paraboloidal antenna. The load of the thermal stress analysis is the linearity temperature (110~140.5℃) on the part of the in-wall of circular column of the antenna. The stress of the antenna is 37.3Mpa, and under this stress the deformed amount of antenna is 0.104mm. This article established the base for the calculation of thermal-stress analysis of antenna which is under complex condition.