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The authors have worked on the study and development of an Active Mass Damper (AMD) system since 1986. The main purpose of this system is to reduce vibrations of buildings during strong winds in order to improve the comfortability of the building occupants. The 'Sendagaya INTES' in Tokyo, Japan, is Takenaka's first building to be equipped with the...
Contexts in source publication
Context 1
... aspect ratio (= building's height / building's width) is 3.2, however, the effective aspect ratio is higher due to the irregular horizontal plan. The cross section and the horizontal plan are shown in Figure 1. The dynamic characteristics are listed in Table 1. ...
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... on the observations taken at the nearest meteorological observatory, the maximum 10-minute mean wind speed at the top of this building was estimated to be 21.6m/s for a five years return period. From the building's shape, it was predicted that strong winds would shake the building easily, especially in the torsional direction and Y-direction defined in Figure 1. The vibration of the building under this wind speed was calculated to be 6.0cm/s 2 at the edge of the higher floors. ...
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... the moving masses that we use are relatively big when compared with other AMDs using a steel or concrete mass. The elevation of the AMD is shown in Figure 1 and properties of the AMD are listed in Table 1. ...
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... items are velocities of the building, wind speeds, wind directions and behavior of the AMD such as the strokes, the oil pressures and the control currents. Some of these measure points are located in Figure 1. 0.3 cm/s at the roof floor and 0.2 cm/s at basement floor were chosen as the trigger levels of these observations. ...
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A 3-storey residential building with OSB-sheathed light-frame timber walls and timber-concrete composite slabs was subjected to dynamic excitation in two different stages of construction. The experiments consisted of measurements of the accelerations resulting from forced horizontal vibrations which were excited by means of a hydraulic actuator sha...
Citations
... Many buildings with AMDs were monitored in order to verify the system's control performance and increase its reliability. In the 1990s, the decade in which AMDs were beginning to be used in Japan, a number of recorded observations of the systems were published [3,[5][6][7][8] including the authors' works. The number of records that were disclosed diminished with the increasing diffusion of AMDs, and currently, very few records are being disclosed. ...
SUMMARY Active mass dampers (AMDs) have been installed in more than 50 buildings in Japan to control building vibrations. Most of these were used to improve the comfort of those inside the building during strong winds. The authors developed an AMD system with a regenerating system to save energy. The second application of this system was its installation in a 24-story high-rise building in Tokyo. Monitoring of the building and the AMD began in November 2010. Verifications of the system's vibration control performance and regenerating energy were conducted on the basis of the monitoring records. The 2011 earthquake off the Pacific coast of Tohoku shook this building and the AMD to a significant degree. The AMD was able to move under relatively strong vibrations by introducing a variable gain procedure. It also had a built-in brake system and oil buffers to help manage excessive input. In the event of an earthquake, the brake system successfully worked as designed. After automatic restarting after braking, the variable gain control procedure effectively managed the stroke displacement within a controllable stroke limit. In addition to the control performance of the AMD, the energy consumption during typhoon no. 11 in 2011, the earthquake on September 15, 2011, and the Tohoku earthquake is presented. The results show that the regenerating system saved as much as 35–65% of the energy that would be consumed. Copyright © 2013 John Wiley & Sons, Ltd.
... Takenaka Corporation have worked on the study and development of the AMD [2][3][4][5][6][7] since 1986. In this study, a hydraulic actuator has been selected for the control device because of its high durability and high cost performance. ...
... By analysing these records, the control performance of the AMD system were veriÿed. In this analysis, many techniques [6] were employed to evaluate the performance of the AMD from the observation records. In the following sections, the authors will introduce some of these techniques to describe the features of observation records and the control performance of the AMD during strong winds and earthquakes. ...
The application of active mass damper (AMD) systems into buildings has been studied analytically and experimentally during the 1980s. The main purpose of these systems is to reduce the vibrations of buildings during strong winds or small earthquakes in order to improve the comfort of the building occupants. The authors have worked on the study and development of an AMD system using an electro-servo-type hydraulic actuator.
First, the control technique of AMD with hydraulic actuator is formulated. Hydraulic actuators have an advantage of high durability and high cost performance, however, they also have non-linear dynamics, which makes their control difficult.
Second, the applications of this system in the buildings are shown. The authors have applied this AMD system to four buildings in Japan. The outlines of these AMDs and buildings are described individually. To verify the control performance of the AMD in these buildings, free vibration tests were carried out just before their completion. Free vibration test results of each building demonstrated good control performance. After the completion, wind and earthquake observations were conducted. The records have shown a good performance of energy absorption of the vibration during wind excitation and small level earthquakes. Copyright
... g several active control systems, an AMD system was selected for this study, because it is a very reliable system. AMD systems have been installed in more than twenty buildings in Japan from 1989 to 1995 [Spencer Jr. and Sain (1997)]. The control performance and the reliability of these AMDs have been reported based on long term observations [e.g. Yamamoto et. al. (1998)]. However, these AMDs were designed only for strong winds and small earthquakes. ...
In order to apply the Active Mass Damper (AMD) system to seismic response control of building structures subjected to large earthquakes, an algorithm that can control AMD under consideration of its capacities is essential. In this paper, the formulation of such algorithm is described. In this algorithm, firstly, modal responses of the structure and AMD are estimated by Kalman filtering. Secondly, variable gain control based on the pole assignment method is executed for each mode by referring the activity of AMD. The performance of the proposed algorithm is confirmed by shaking table tests using a building structural model with AMDs. The results of shaking table tests demonstrate that the algorithm is effective to control AMD under the AMD stroke limitation.
This book represents the author’s views and impressions of structural sensing, health
monitoring, and prognosis. These were derived from the vast body of work developed
over the past couple of decades by highly creative and productive researchers. Although
some of the citation lists are lengthy, no attempt has been made to be comprehensive in the
literature reviews. The author welcomes suggestions for improvements and corrections to
the book.
