Modelling and dynamical analysis of rotating variable-stiffness composite laminated revolving shell with elastic constraints using complete-gradient ANCF

In the model of rotating variable-stiffness composite laminated revolving shell (RVSCLRS), the element must be able to accurately describe the meridional direction and easily eliminate the initial stress in the initial bending configuration. To meet the requirements, a new type of complete-gradient ANCF space curved trapezoid element is proposed, and the fitting technology of bicubic Be & PRIME;zier revolving surface is used to initialize it. By using this element and artificial spring groups, the nonlinear dynamic differential equation of RVSCLRS with different boundary condition is established. Based on the linearization of this equation, the eigenvalue equation at the equilibrium position is derived. Compared with the numerical results of the degradation model, the validity of the proposed model is verified. By exploring the influence of boundary conditions, material structure, load and angular speed on RVSCLRS, it shows even if the material structure and boundary conditions are the same, the change of meridian has a significant impact on the stress distribution and vibration characteristics of the RVSCLRS.