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Seminar from Dr. Zi-Qiang Lang, Department of Automatic Control and Systems Engineering, University of Sheffield
In this talk, the beneficial effects of nonlinear damping on structural system vibration control are investigated via rigorous analytical studies using nonlinear system frequency domain analysis approaches developed at Sheffield. The results indicate that the introduction of odd powered nonlinear damping devices can effectively overcome the well-known problems with linear damping which can attenuate the vibration energy around resonant frequencies but may be detrimental for vibration suppression over other frequency ranges. Experimental results are used to demonstrate the beneficial effects of nonlinear damping revealed by the theoretical studies. Finally, a novel approach based on integrating the instantaneous harmonic control (IHC) with nonlinear damping is introduced to resolve the robustness problem with IHC, which relies on an accurate knowledge of disturbance frequency to achieve an ideal control performance. Both simulation and experimental study results are provided to demonstrate the effectiveness of the new technique which exploits the effects of nonlinear damping to achieve a robust and much better harmonic control.
- Dr. Zi-Qiang Lang
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