Response of semi-active variable stiffness and damping systems to pulse-type excitations: Analytical and experimental study
Master of Science
Significant reduction in vibration can be obtained by using semi-active control in structures subjected to pulse type excitations. This can be achieved by (a) independently variable stiffness control; (b) independently variable damping control or (c) combined variable stiffness and damping control. This thesis presents nonlinear control algorithms developed to vary stiffness and damping in single and multidegree of freedom structures subjected to pulse type excitations to reduce vibrations. The efficiency of the controllers is studied both analytically and experimentally. Nonlinear response spectra and time-histories are presented to show the reduction in response obtained by using the control algorithms. The study concludes that the variable stiffness and variable damping systems lead to significant response reduction over a broad period range and can be implemented in practice.