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A numerical prediction of the vibration behaviour is necessary for an efficient use of composite materials in rotors, especially since the modal parameters such as the eigenfrequency and the modal damping are influenced by the fibre orientation.
The modal parameters (natural frequencies, mode shapes, and modal damping) are functions of the physical parameters (mass, stiffness, and damping), and therefore, it is reasonable to assume that the existence of damage leads to changes in the modal properties of the structure.
The SSE presented in this study is derived from moment curvature response in which all the modal parameters (namely natural frequency, mode shapes and modal damping) are taken into account.
Numerical results of the steady equilibrium deflections and the aeroelastic modal damping are presented for various configurations of composite rotor blades and are compared with those obtained from a previously published modal analysis using a moderate deflection-type beam theory.
For the restricted case that the FDM is installed close to one cable anchorage, asymptotic solutions for the system complex frequency and modal damping are presented; explicit formulas have also been derived to determine the maximal attainable damping and corresponding optimum FDM parameters, based on which effects of frequency-dependent damper properties are appreciated.
Numerical results of the static deflections and the aeroelastic modal damping are presented for various configurations of a composite flexbeam and are compared with previously published experimental results and theoretical values obtained from a modal analysis using a moderate deflection-type beam theory.
Similar(54)
Viscous modal damping is considered.
Modal damping is connected to the structural mass and stiffness.
Modal damping is incorporated to account for energy losses arising from the fluid viscosity and the inclusion of damping screens.
The active modal damping is added to the coupled system via negative velocity feedback.
For the calculation of the forced vibrations of the bladed disc viscous modal damping is included.
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