State-Switched Absorber/Damper for Structural Control.

摘要

This project investigated a novel variation on the concept of a tuned vibration absorber or damper: the State-Switched Absorber (SSA). The SSA is capable of altering its stiffness state nearly instantaneously. The change in stiffness causes a change in the resonance frequencies of the system thereby instantaneously retuning the SSA to a new frequency. The state-switching technique increases the effective bandwidth of the absorber can be made to be effective against multiple frequencies within its bandwidth and in addition; holds forth the potential for unique applications such as the preferential 'pumping' of energy into the absorber. The project yielded modeling methods for the absorber applied to common structural elements e.g. beams and plates; switching rules for actuators; analysis methods for placement and optimization; SSA prototypes; control circuit implementations, and experimental validation of state-witched absorbers.