Abstract
AbstractThis paper proposes a new method for online identification of damping properties in seismically excited structures. It is a major extension of the recently developed Virtual Synchronization Method (VSM) with the following benefits: Its formulation is simpler and contains fewer design parameters. It includes a sufficient condition which can be validated online to ensure whether it is successful in identification of the structural damping model. It is assumed that the parameters of the damping model are fully unknown whereas the stiffness and mass of the structure are known. Online measurements of the ground motion acceleration, displacement and velocity vectors are available. Using these data, a virtual copy of the original structure is created. Then, the error between the states of the two systems is calculated. It is employed for designing an appropriate virtual controller which forces the virtual system to synchronize with the original one. Consequently, the states of these two systems are used to propose a nonlinear adaptive law to estimate the unknown parameters of the damping model. Provided numerical examples show that the proposed online identification method is efficiently fast, promising and worthy of further studies.
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