Publicação: A contribution for nonlinear structural dynamics characterization of cantilever beams
Carregando...
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Tipo
Trabalho apresentado em evento
Direito de acesso
Acesso aberto
Resumo
Successful experiments in nonlinear vibrations have been carried out with cantilever beams under harmonic base excitation. A flexible slender cantilever has been chosen as a convenient structure to exhibit modal interactions, subharmonic, superharmonic and chaotic motions, and others interesting nonlinear phenomena. The tools employed to analyze the dynamics of the beam generally include frequency- and force-response curves. To produce force-response curves, one keeps the excitation frequency constant and slowly varies the excitation amplitude, on the other hand, to produce frequency-response curves, one keeps the excitation amplitude fixed and slowly varies the excitation frequency. However, keeping the excitation amplitude constant while varying the excitation frequency is a difficult task with an open-loop measurement system. In this paper, it is proposed a closed-loop monitor vibration system available with the electromagnetic shaker in order to keep the harmonic base excitation amplitude constant. This experimental setup constitutes a significant improvement to produce frequency-response curves and the advantages of this setup are evaluated in a case study. The beam is excited with a periodic base motion transverse to the axis of the beam near the third natural frequency. Modal interactions and two-period quasi-periodic motion are observed involving the first and the third modes. Frequency-response curves, phase space and Poincaré map are used to characterize the dynamics of the beam.
Descrição
Palavras-chave
Base excitation, Base motion, Chaotic motions, Closed-loop, Electromagnetic shakers, Excitation amplitudes, Excitation frequency, Frequency-response curves, Measurement system, Modal interactions, Non-linear phenomena, Non-linear vibrations, Nonlinear structural dynamics, Phase spaces, Poincare, Quasi-periodic motion, Subharmonics, Super-harmonic, Vibration systems, Dynamics, Phase space methods, Structural dynamics, Cantilever beams
Idioma
Inglês
Como citar
International Congress on Noise Control Engineering 2005, INTERNOISE 2005, v. 3, p. 1950-1959.
