Civil Engineering Reference
In-Depth Information
Chapter 4
Strength Analysis
Abstract The satellite structure must be designed to withstand all static and
dynamic loads encountered during manufacturing, transportation, launch, and
operational life of the satellite. A detailed analysis is made for the satellite
structure for all strength analysis cases of loading specified for it. Strength analysis
of Small Sat is divided into two categories, one is static analysis and the other is
vibration (dynamic) analysis. Strength calculations under static and dynamic loads
are conducted according to special calculation models by finite-element method
with the help of ANSYS package. Modal calculations are conducted to determine
frequencies and forms of natural oscillations for the satellite structure. Dynamic
strength calculations are carried out taking into account damage accumulation on
the basis of fatigue characteristics of the material.
The satellite structure must be designed to withstand all static and dynamic loads
encountered during manufacturing, transportation, launch, and operational life of
the satellite. The satellite must be able to withstand the highest loads encountered
during its lifespan, and it is also required that the satellite structure be durable
during its service life. This is known as designing for the worst case. By ensuring
that the satellite will not fail under the worst loading conditions it can be shown
that the satellite will not fail under any static or dynamic loads during its lifecycle.
Verification means providing confidence through disciplined steps that a
product will do what it is supposed to do. For a high quality product, mechanical
requirements are verified by combining analysis, inspection, and testing. With
inspection and testing, a lot of time and money is spent before finding out whether
the product is any good. Analysis, process development, and development testing
are acceptable ways of ensuring quality. The analysis is the first step in the ver-
ification process. It provides confidence that the satellite structure will meet
requirements for strength, stiffness, natural frequency, and dynamic envelope.
In this chapter, the analysis methods used to verify the integrity of the Small Sat
structure are described. The preliminary static analysis that guided the mechanical
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