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A finite element model is used for flexural vibration analysis of a static (non-rotating) rotor with two open cracks, and the stiffness matrices of the cracked elements are obtained using transfer matrix analysis and local flexibility theorem. Through numerical simulation, the effects of the slenderness ratio and the crack depth on the mode shapes and the changes in the eigenfrequencies of the cracked...
A finite element (FE) model, which is based on transfer matrix analysis and local flexibility theorem, is introduced for crack identification of a static (non-rotating) rotor with an open crack. Through numerical simulation, the effects of the location and depth of the crack on the mode shapes and the changes in the eigenfrequencies of the cracked rotor are investigated, and the ratio of the changes...
By calculating some typical electromagnetic problems, the performances of the FVTD algorithm and the DGTD algorithm for computational electromagnetics are compared systematically, including the choice of the time step, the numerical accuracy, the CPU time and the memory requirement. The FVTD algorithm is more efficient for electrically small structure and is more accuracy for the structure with curved...
In order to reduce the off-track due to the arm bending mode, whose effect is considerable in a high capacity drive, an arm configuration with maximum arm bending stiffness should be considered. The objective of this work is to find the optimal arm configuration that maximizes the arm bending stiffness subject to the constraint imposed on the moment of inertia of the arm. Herein, the problem of finding...
In this paper, a new kind of optimal design model and methodology for large flexible antenna in space with deployed and retracted states are investigated. The purpose is to search for a minimum weight design by means of selecting the cables' tension and cross-sectional areas of the surround truss whilst satisfying the constraints such as, for deployed state, the precision of reflector surface, material...
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