تحليل المان محدود سازه ميكروماهواره

Finite element analysis of micro Satellite structure

طراحي سازه ميكروماهواره پروسه پيچيده اي است كه شامل انتخاب مواد، شكل سازه و تحليل سازه و تست هاي مربوطه مي¬باشد. مهمترين مرحله طراحي سازه ميكروماهواره¬ها در مرحله اول پايداري و استقامت آن در برابر بارهاي احتمالي و نيروهاي احتمالي ناشي از محيط پرتاب از قبيل شتاب و نيروهاي صوتي و تغييرات دمايي شديد و ... مي¬باشد. در اين پژوهش پس از انتخاب جنس مناسب مواد، آناليز المان محدود مكانيكي شامل تحليل¬هاي استاتيك، ديناميك و مودال بر روي چارچوب¬هاي معتبر پيشنهادي براي سازه ميكروماهواره اجرا شده و مصالحه بين طرح¬هاي پيشنهادي انجام شده است. نتايج نشان مي¬دهند كه در اكثر بارگذاري¬ها تنش ها در قطعات اصلي بسيار كمتر از حد تسليم مواد آن¬ها مي باشد.

Design of microsatellite structure is a complicated process which includes material selection, structure shape, analysis and tests. The most important stage in microsatellite structure are stability and resistance against probable loads and forces resulting from launch environment such as intensive accelerations, acoustic loads, and intensive thermal variations. In this research after selecting suitable material, mechanical finite element analyses including static, dynamic and modal analysis are performed on valid presented frames for microsatellite structure and then quantitative comparison is done. After finite element analysis of structure assembly set, the optimum design of structure is presented by changing the geometrical dimensions and their optimization through output results of software. The results show that the stresses in most loadings are less than the yield limit of the material. Since the rigidity of the structure is most controlled by columns and main frame, and reducing weight of these elements results unfavorable conditions, so these are become more robust in the design. But subsidiary columns and the bottom plate are redesigned and their weight are reduced through geometrical changes in the design. This leads an increase in their stress level.