Space structure vibration modes: How many exist? Which ones are important?

  title={Space structure vibration modes: How many exist? Which ones are important?},
  author={Peter Hughes},
  journal={IEEE Control Systems Magazine},
This paper attempts to shed some light on the two issues raised in the title: How many vibration modes does a real structure have? and Which of these modes are important? The author argues that the "absurd subspace" (all but the first billion modes) is not a strength of continuum modeling, but, in fact, a weakness. Partial differential equations are not real structures, only mathematical models. This paper also contends that the partial differential equation model and the finite-element model… CONTINUE READING
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