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Nonlinear Normal Modes of Buckled Beams: Three-to-One and One-to-One Internal Resonances

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Abstract

Nonlinear normal modes of a fixed-fixed buckled beam about its first post-buckling configuration are investigated. The cases of three-to-one and one-to-one internal resonances are analyzed. Approximate solutions for the nonlinear normal modes are computed by applying the method of multiple scales directly to the governing integral-partial-differential equation and associated boundary conditions. Curves displaying variation of the amplitude of one of the modes with the internal-resonance-detuning parameter are generated. It is shown that, for a three-to-one internal resonance between the first and third modes, the beam may possess one stable uncoupled mode (high-frequency mode) and either (a) one stable coupled mode, (b) three stable coupled modes, or (c) two stable and one unstable coupled modes. For the same resonance, the beam possesses one degenerate mode (with a multiplicity of two) and two stable and one unstable coupled modes. On the other hand, for a one-to-one internal resonance between the first and second modes, the beam possesses (a) two stable uncoupled modes and two stable and two unstable coupled modes; (b) one stable and one unstable uncoupled modes and two stable and two unstable coupled modes; and (c) two stable uncoupled and two unstable coupled modes (with a multiplicity of two). For a one-to-one internal resonance between the third and fourth modes, the beam possesses (a) two stable uncoupled modes and four stable coupled modes; (b) one stable and one unstable uncoupled modes and four stable coupled modes; (c) two unstable uncoupled modes and four stable coupled modes; and (d) two stable uncoupled modes and two stable coupled modes (each with a multiplicity of two).

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Authors and Affiliations

  1. Department of Engineering Science and Mechanics, MC 0219, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, U.S.A

    Ali H. Nayfeh, Walter Lacarbonara & Char-Ming Chin

Authors
  1. Ali H. Nayfeh
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  2. Walter Lacarbonara
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  3. Char-Ming Chin
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Nayfeh, A.H., Lacarbonara, W. & Chin, CM. Nonlinear Normal Modes of Buckled Beams: Three-to-One and One-to-One Internal Resonances. Nonlinear Dynamics 18, 253–273 (1999). https://doi.org/10.1023/A:1008389024738

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