Vibration suppression of nonlinear laminated composite plates using internal oscillator-enhanced nonlinear energy sinks

This paper concerns an investigation into the excessive vibration control of laminated composite plates using a nonlinear energy sink with internal oscillator (NES-IO). The proposed NES-IO can suppress vibration more effectively than traditional NES measured by both energy dissipation and frequency responses. Based on the first-order shear deformation theory and the Galerkin method, the dynamic model of the nonlinear laminated composite plate with the NES-IO is established. Then, the mechanism of the NES-IO is analyzed, and the internal oscillator improves the vibration reduction performance of the absorber, especially with large amplitude excitations. Through comparing the NES-IO with the traditional NES, it is found that the effective vibration reduction range of the NES-IO under shock excitation is wider. Moreover, the slow flow equations of the system are derived by the complexification-averaging method, and the result is verified by the Runge-Kutta method. It is also found that the NES-IO has a great advantage in suppressing the occurrence of higher branch responses through the frequency-responses analysis. Furthermore, the influences of the parameters of the grounded and internal oscillators on the vibration suppression are also discussed to optimize the NES-IO structure.

Automated summary

This paper investigates the excessive vibration control of laminated composite plates using a nonlinear energy sink with internal oscillator (NES-IO). The proposed NES-IO is more effective in suppressing vibration than traditional NES, as measured by both energy dissipation and frequency responses. Based on theoretical models and analysis methods, the dynamic model of the nonlinear laminated composite plate with the NES-IO is established. The mechanism of the NES-IO is analyzed, and its improvement in vibration reduction performance, especially with large amplitude excitations, is demonstrated.