DESIGN OF A 1U CUBESAT PLATFORM FOR - UNSAM · DESIGN OF A 1U CUBESAT PLATFORM FOR EDUCATIONAL...
Transcript of DESIGN OF A 1U CUBESAT PLATFORM FOR - UNSAM · DESIGN OF A 1U CUBESAT PLATFORM FOR EDUCATIONAL...
DESIGN OF A 1U CUBESAT PLATFORM FOR EDUCATIONAL PURPOSES
A. O. Rêgo (*), M. C. Pereira(*), M. Greco (*), E. Peiró (**)
(*) Universidade Federal de Minas Gerais – Belo Horizonte, MG – Brazil(**) Unidad de Formación Superior CONAE/ UTN - Argentina
Objective:Develop and analyse an 1Upicossatellite platform forAerospace Engineering courses.Suggest two different internalconfigurations. Studies of typical launching
conditions to determineaccelerations and loads.
Develop a complete modelling ofthe structure in 3D CAD.
Methodology: Systemic analysis Environment and interfaces Conceptual development Need analysis Operational analysis Functional analysis Viability definition
Comparative Method Simulation using FEM
ConceptualDesign: Monocoque structure Preliminary modelling Basic components OBDS Reaction wheels Battery Solar sensor Transmitter
Structure assembly
Structural Analysis Aluminium alloy Al 7075 T6 Static Analysis von Mises tension
Dynamic Analysis Natural frequencies
Requirements: CubeSat Design Specification Tests Phylosophy Qualification Protoflight Admission
Mandatory tests
DesignModifications Modifications for mass reducing
and new simulations for structuralanalysis
Conclusions:In this paper the CubeSat was consideredas a system, the structure being onesubsystem, with expected behavior. CDSwas used for the requirements and testsphilosophy. A monocoque structure waschosen and simulations based on FEMwere performed, using Femap and NxNastran, both of the structure itself andwith components. Static load analysisshowed that inertial forces do notproduce significant tensions. Also theinfluence of each natural frequency onmass allocation was evaluated, showingthat only the 10 first natural frequenciesare relevant. Tests of alleatory vibrationwere performed, and, based on them, itis known that fatigue was not expectedfor the mandatory 3 minutes. Sinusoidalvibration and impact tests show that noplastic deformation or fatigue damage isexpected. The structure was optimizedfor mass reduction and all simulation wasperformed again, showing thatrequirements are met for the newstructure, that weights 114.4g.
Figure 1– Comparison betweentensions on the base – original and
modified structure
Figure 2: Initial suggested structure
Figure 3: Structure modification
Figure 4 – Modified structure levels of tension for spectral analysis