| The space camera is the most important effective payload of remote satellite, andas one important means of the earth observation, every country pays more attention toit. The mechanical environment as the mirror component is tested, carried, launchedand in status of orbital flight, directly influences the stability of the space camera andthe imaging quality. Random vibration is the key factor in the mechanicalenvironment. The accumulated damages caused by vibration will bring fatigue failureto the component. As one of the main failure mode of mechanical components, fatiguehas become an important subject.In this paper, taking the mirror component for study, studied the finite elementanalysis and fatigue analysis of the mirror component. The main research works inthis paper are as follows:(1) Introduced domestic and foreign status on space camera and vibration fatigue,introduced their development trend. Then fatigue and finite element method wereexplained.(2) Created a mirror component model in the MSC.Patran, and made theappropriate simplification on the model. Used appropriate element to mesh the model,and defined the material properties and restraint of the mirror component according tothe actual situation.(3) Analyzed the modal of mirror component. And the fore ten natural frequencies and corresponding modes were obtained by MSC.Nastran. The resultsindicate that the structure stiffness is good enough to avoid the damage caused byvibration, and this mirror component can guarantee the quality of the imaging of thecamera.(4) After Modal analysis, applied unit acceleration on the model to makefrequency response analysis. The relationship between the stress, acceleration andexcitation frequencies could be more intuitive to saw from the results. The stressfrequency response curve, that is the system transfer function, is to shift the basis offatigue analysis section.(5) Basing on the analysis above, considering the material fatigue properties andthe loads, analyzed the fatigue life of mirror component with MSC.Fatigue. The areawith maximum fatigue damage and the distribution of fatigue life was found.According to the results of sensitivity analysis, the structural parameters’ optimizationwas made. Also the fatigue life of the new structure was analyzed.(6) Dynamic experiment of the mirror component had been done. Test resultsdemonstrate that the model of the mirror component is reasonable, also the methodand the results of the fatigue analysis is accurate and reliable.It indicated that, the mirror component meet the design requirement, and canguarantee the safety in an adverse mechanical environment. Achieve to predict fatiguelife of the mirror component at design stage, and this can effectively shorten thedevelopment cycle and reduce the design cost. This conclusion can provide referenceto the design of mirror component, and the related research. |
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