Optimization Of Mechanical Design For Compression Equipments On Satellite

As a new packaging technology, Surface Mount Technology (SMT) is widely used invarious industries; SMT has many advantages such as lows cost, high integration, lightweightand easy automation. The main disadvantage of the SMT is the solder joints failure whichcaused by thermal/power cycle, shock and vibration. Thermal factor is the main cause forjoints failure; much research has been concentrated in this field. However, in dynamicsituation, the main cause for failure is vibration and shock, and it has been paid more attentionnow, but the effect of shock and random vibration has not been systemic studied. So it isnecessary to study it.With the development of space technology, more and more large-scale integratedcircuits are used in satellite electronic equipments. Such electronic equipments can not berepaired after launch, Large-scale integrated circuits failure caused by the deformation hasbeen found in some satellite electrical equipments during vibration tests, these kinds ofcomponents are found to be sensitive to the deformation caused by vibration; excessivedeformation can result in high stress in the legs of the components. So how to adjust relatedparameters to optimize the mechanical structure, improve the structure stiffness is necessary.In this thesis, designs and optimization of the equipment can be divided into three levels,the unit, modules and components. During unit design stage, three configuration styles areprovided and the optimal configuration is selected. During modulus design stage, the shapesand sections of the reinforcing ribs are optimized, such as井,川ribs. During componentsmounting design stage, several glue methods are compared, the best method is selected. Allthe work mentioned above is completed with finite element method.In this study,3D models of the equipment are designed by the software Pro/E, andsimulating analysis is performed by the software Patran/Nastran. The vibration responses ofthe key components are studied and optimized. The patterns of the structures design in theequipment are optimized to improve the stiffness; the patterns to mount the components,especially the use of glue to strengthen the components, Optimization and verification of thedesign are both based on the theory analysis and simulation.