Comparison of open-loop stiffness control methods to suppress self-excitation vibrations

Results of a stability investigation on vibration cancelling with three different types of variable-stiffness actuators are presented. A two-mass system is considered, with the top mass excited by self-excitation forces generated by a wind flow. The stiffness of an actuator between the base mass and the base changes, according to a control frequency. Comparisons of analytical predictions and numerical results are discussed. Numerical simulation is employed as a tool to investigate effectively the proposed methods and carry out parameter studies.