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Analysis & Vibration Control of a Rotating Beam with Variable Properties of the Cross Section

Sahlolbeye, Zahra | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49532 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moradi, Hamed
  7. Abstract:
  8. The purpose of this project is to model a rotating beam with variable properties of the cross section and also to present an active control method for suppressing the undesired vibrations due to external loading. The beam is modeled as a cantilever Euler-Bernoulli beam with nonuniform physical and geometrical properties. For a practical example, the characteristics of a wind turbine blade was used to solve the problem. The analyzed blade in this study is NREL 5-MW wind turbine blade. But the method can be extended to be used for other blades as well . First the natural frequencies and modeshapes were computed by MATLAB. Then by applying pole placement method, a control strategy was designed to mitigate the destructive effects of resonance vibrations and the response of blade due to harmonic excitation in both resonance and nonresonance conditions was obtained. The control force is applied to the blade by means of an actuator that is located inside it and exerts the force to the tip of the blade. The aim of the control law is to specify how much force is required for reducing the deflection to the desired value. For analyzing the designed controller, the deflection of the blade tip which is an important point with large deflections was obtained before and after applying the controller. The results show significant reduction in the deflection of the blade after applying the controller
  9. Keywords:
  10. Lateral Vibration ; Beam Vibration ; Pole Placement Control ; Active Control ; Natural Frequency ; Mode Shapes ; Cross Section Variable

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