Dynamic behavior of cylindrical shell with partial constrained viscoelastic layer damping under an impact load

The dynamics of the cylindrical shell with partial constraining layer damping are discussed in this paper (PCLD). The developed model includes the harmonic and transient regimes. In transient regime the cylindrical shell is impacted by a hammer. The governing equation is based on Lagrange equations and Galerkin assumed mode method. The impact is modeled with Heitkamper equation. The stiffness of viscoelastic layer is supposed to be complex and frequency independent. The governing equation is solved in the frequency domain using fast Fourier transform (FFT) and then converted back to time domain with inverse fast Fourier transform (IFFT). The model is validated with results available in the literature. The conclusions obtained are consolidated by finite elements simulations with ANSYS. Several simulations are performed to study the response of the cylinder with PCLD due to the impact. Furthermore, the influence of the patch characteristics and the contact time between hammer and structure are also studied. Interesting results which shed the light on some of the behavior of the cylinder during the first milliseconds are also presented.