A new control strategy to improve a tuned mass damper (TMD) is disturbances. The feedback gain of the proposed algorithm is linear to the response acceleration of the primal system and it is optimized in :he frequency domain under a harmonic excitation. According to this method both the feedback gain and the TMD parameters are optimized in the frequency domain and they are expressed in a set of closed form solutions. The performance of the proposed control method is discussed and compared with that of a passive TMO.
This paper reviews an active control algorithm adopted for an active-passive composite tuned mass damper, which is a unique vibration control device equipped into an office building in Tokyo in 1993. The main purpose of this device is to subdue the response motion of tall buildings under random disturbances such as wind pressures and small earthquakes. The main topics in this paper are: (1) the principle of the acceleration feedback algorithm, (2) the expected control performance, (3) the multi-modal control algorithm, (4) the observed performance of the applications using the algorithm.
SUMMARYAn active mass driver (AMD) system has been installed in a ten-storey o ce building in Tokyo to suppress vibration in both one-translational and the torsional directions under earthquake and wind loadings. This installation is the ÿrst application of active structural control in the civil engineering ÿeld. This paper describes the objective building and its dynamic properties, the composition and speciÿcation of the AMD system, the control strategy, the control purpose, and the system's e ectiveness based on observation records. The control strategy has basically been introduced as an output feedback control law that is simpliÿed from a state feedback control law in the linear quadratic regulator problem. The responses of both the structure and the AMD system have been recorded since 1989. A structurecontroller interaction model is identiÿed to simulate the earthquake observation records and to compare them with the analysed uncontrolled responses. An ARX model is ÿtted to each set of these observation records to evaluate the control e ectiveness as equivalent damping ratios in the vibration modes. Both the simulation and the system identiÿcation conÿrm that the AMD system achieves the control purpose under earthquake excitations. The wind observation records also show high control e ectiveness.
This paper discusses the optimization of the active‐passive composite tuned mass damper which was recently proposed by the authors for the purpose of reducing response vibrations of building structures subjected to disturbance excitations such as wind pressures or earthquakes. The parameter optimization, control force reduction, control energy minimization are discussed under several different types of excitations. A harmonic excitation, a stationary white noise and a non‐stationary random excitation such as earthquake are all considered for the derivation of formulae.
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