Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlinear vibration localisation in a symmetric system of two coupled
  beams   We report nonlinear vibration localisation in a system of two symmetric
weakly coupled nonlinear oscillators. A two degree-of-freedom model with
piecewise linear stiffness shows bifurcations to localised solutions. An
experimental investigation employing two weakly coupled beams touching against
stoppers for large vibration amplitudes confirms the nonlinear localisation.

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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph