Abstract
AbstractThis paper presents a study on the applicability of the preview control method for improving the performance of active seismic control systems. The active preview control method is examined as described for its ability to improve vibration suppression as follows: (1) the relation between the number of preview steps and the degree of improvement in control performance is clarified by analysis using predicted earthquake waves, and (2) to evaluate the applicability to an actual structure, predicted surface seismic waves are calculated by an autoregressive model from observed KiK-net data on 100–200-m-deep underground seismic waves and the applicability of the method is confirmed.
Highlights
Active control techniques are designed to calculate the controlling force by minimizing the evaluation function, which is comprised of the quadratic form of the quantity of states and the controlling forces (Kobori 1993; Yoshikawa and Imura 1994; Ikeda 2004; Seto 1998; Phillips et al 2012)
This paper examines the adoption of a preview control method (Sheridan 1966; Hayase and Ichikawa 1969; Tomizuka and Rosenthal 1979; Katayama et al 1985) that uses projected data on future external forces in an effort to improve active control performance
A preview control method is proposed for improving the efficiency of active control systems
Summary
Active control techniques are designed to calculate the controlling force by minimizing the evaluation function, which is comprised of the quadratic form of the quantity of states and the controlling forces (Kobori 1993; Yoshikawa and Imura 1994; Ikeda 2004; Seto 1998; Phillips et al 2012). One possible application, which is discussed in this paper, is to establish an active preview control system using data on predicted seismic wave behavior that has been formulated by applying an autoregressive model (Hannan 1970) in high speed computations on seismic wave data transmitted from a seismograph set up several hundred meters below the target structure. These methods are not designed to predict future ground waves online It is demonstrated how a predicted seismic wave at the ground surface can be calculated by using the underground observation data provided by the strong-motion seismograph network (National Research Institute for Earth Science and Disaster Prevention 1996), and the possibility of application to actual structures is examined.
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