Chebyshev collocation method for the free vibration analysis of geometrically exact beams with fully intrinsic formulation. (English) Zbl 1406.74304

Summary: A Chebyshev collocation method is presented for the free vibration analysis of geometrically exact nonlinear beams with fully intrinsic formulation. The intrinsic formulation of the governing equations of the beam contains neither displacement nor rotation variables. The proposed collocation discretization technique is based on the Chebyshev points as the collocation points and the orthogonal Chebyshev polynomials as the trial functions. This method is successfully applied to the eigenvalue analysis of the linearized intrinsic governing equations of a nonlinear beam. A number of test cases have been considered for either straight or pretwisted beams and the obtained results are compared to the analytical, numerical as well as experimental results. In order to show the applicability of current approach for real-life engineering problems, a composite wind turbine rotor blade with non-uniform distribution of properties is also considered. In all test cases a very good concordance has been observed. The proposed method bypasses the integrations common in finite element based methods and difficulties associated with finite rotations interpolation and while exhibiting a very good accuracy compared to the finite element results, it is computationally more efficient and simpler to implement in a computer programming code.


74H45 Vibrations in dynamical problems in solid mechanics
74K10 Rods (beams, columns, shafts, arches, rings, etc.)
74S25 Spectral and related methods applied to problems in solid mechanics
74S05 Finite element methods applied to problems in solid mechanics
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