科研之友
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摘要
In this paper, the nonlinear vibration characteristics of the hard-coating cylindrical shell with base excitation are investigated based on a composite cylindrical shell element of 4 nodes and 48 degrees of freedom. An elastic constraint with continuous variable stiffness is constructed to simulate the real boundary conditions of the shell. Considering the material damping, the equivalent viscous damping and the strain dependencies of storage modulus and loss factor of hard coating, a unified nonlinear iterative solution method is developed for the vibration analysis. As an example to demonstrate the feasibility of the developed model, the experimental test of the cylindrical shell coated with NiCoCrAlY YSZ hard coating is implemented. The results of the developed model and experimental test show a good consistency, and both indicate that the hard-coating cylindrical shell with strain dependence has the unique properties of soft nonlinearity compared with the linear results.
