Abstract
The free vibration and damping characteristics of rotating shaft with passive constrained layer damping (CLD) are studied. The shaft is made of fiber reinforced composite materials. A composite beam theory taking into account transverse shear deformation is employed to model the composite shaft and constraining layer. The equations of motion of composite rotating shaft with CLD are derived by using Hamilton’s principle. The general Galerkin method is applied to obtain the approximate solution of the rotating CLD composite shaft. Numerical results for the rotating CLD composite shaft with simply supported boundary condition are presented; the effects of thickness of constraining layer and viscoelastic damping layers, lamination angle, and rotating speed on the natural frequencies and modal dampings are discussed.
Highlights
Rotating shafts are used for power transmission in helicopter drive applications
Zinberg and Symonds [1] used an equivalent modulus beam theory (EMBT) to predict the critical speeds of composite shaft. dos Reis et al [2] analyzed the critical speeds of thinwalled composite shafts by incorporating the Timoshenko beam theory with the Donnell thin shell theory
The results show that modal dampings increase as the thickness of viscoelastic damping layer increases
Summary
Rotating shafts are used for power transmission in helicopter drive applications. Weight, vibration, strength, and fatigue have been recognized as serious problem in structural design of this device. Ren et al [9] presented a structural modelling and dynamical analysis of rotating composite Timoshenko shaft based on the thin-walled composite beam theory referred to as variational asymptotic method. Wang and Chen [15] presented a finite element model of a cylindrical shell with partially CLD by using a discrete layer theory. The semianalytical finite element method based on shell theory has been employed to solve natural frequencies and loss factors. An analytical model is developed for free vibration and damping capacity analysis of a rotating CLD composite shaft. Numerical results for the rotating CLD composite shaft with supported boundary condition are presented, and the effects of thickness of constraining layer and viscoelastic damping layers, lamination angle, and rotation on the natural frequencies and modal dampings are discussed
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