Real-time hybrid testing of a structure with a piezoelectric friction controllable mass damper by using a shake table

Chu, Shih-Yu; Lu, Lyan Ywan; Yeh, Sung-Wei

doi:10.1002/stc.2124

Cited by 8 publications

(6 citation statements)

References 44 publications

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“…Sensing was performed with the actual equipment. The method is called real‐time hybrid test 32–34 . Figure 7 shows the conceptual view of the experimental system.…”

Section: Vibration Damping Control Experimentsmentioning

confidence: 99%

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Active vibration control for high‐rise buildings using displacement measurements by image processing

Itô

Tagami

Tagawa

2022

Structural Contr & Hlth

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This study aims to develop a high-performance active mass damper (AMD) for super high-rise buildings with a low natural frequency. Conventional AMDs utilize accelerometers to control vibration. However, those AMDs cannot sufficiently damp the vibration because the accelerometer sensitivity is low in a low-frequency band (e.g., the natural frequency of high-rise buildings). Under these circumstances, this study proposes the measurement of vibration displacements using cameras and an image processing technique, called template matching, instead of accelerometers. The measurement accuracy in the low-frequency band was evaluated by comparison to that of the accelerometer.The results indicate that the proposed method achieved a higher measurement accuracy compared to the accelerometers in the low-frequency band. One problem when applying the displacement measurement using image processing to the vibration control is time delay with calculation. We solved this problem using the Padé approximation. Finally, real-time hybrid tests attained with a combination of real-time simulation and experiment were conducted. The results confirmed that the proposed method reduced the first resonance peak value by 24% in the low-frequency band compared with the accelerometers. In addition, it can prevent the degradation of the vibration damping performance of the higher vibration modes (i.e., spillover phenomena) caused by acceleration control. The proposed method contributes to the development of a novel AMD that suppresses the shaking of super high-rise buildings. K E Y W O R D S active mass damper, displacement feedback, image processing, spillover, vibration control 1 | INTRODUCTION 1.1 | Background and fundamental purposeSuper high-rise buildings have recently increased in number around the world, and this trend will continue. 1,2 In Japan, buildings with more than 60 m height are dealt as super high-rise buildings, and the situation of their construction is the same of the world's one. The natural frequency of such super high-rise buildings becomes lower with the increase in building height. On the contrary, a long-period (2-20 s) seismic that contains low-frequency components is expected to occur. In Japan, a massive Nankai Trough earthquake is expected to happen, which may cause the

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“…Sensing was performed with the actual equipment. The method is called real‐time hybrid test 32–34 . Figure 7 shows the conceptual view of the experimental system.…”

Section: Vibration Damping Control Experimentsmentioning

confidence: 99%

“…The method is called real-time hybrid test. [32][33][34] Figure 7 shows the conceptual view of the experimental system. The building's top floor displacement was calculated by inputting a seismic wave (i.e., JMA-Sendai-EW) recorded in the great east Japan earthquake to the computer model.…”

Section: Range Of Motion 400mmmentioning

confidence: 99%

Active vibration control for high‐rise buildings using displacement measurements by image processing

Itô

Tagami

Tagawa

2022

Structural Contr & Hlth

View full text Add to dashboard Cite

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“…Experimental results indicated that the control performance of the SAF-TMD is superior to that of the typical passive friction TMD under the same peak TMD stroke. Ju et al [26] proposed a semiactive piezoelectric friction mass damper, the desired friction force of which can be adjusted from the input voltage command of PEAs. Te performance of the damper was validated using a real-time hybrid testing method.…”

Section: Introductionmentioning

confidence: 99%

Active Microvibration Control of Tool Platforms Installed on the Floors Subjected to Moving Vehicles in Industrial Factories

Lee,

Chen,

et al. 2023

Structural Control and Health Monitoring

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The vibration responses of tall flexible tool (or equipment) platforms subjected to floor excitations at the platform base are considered more crucial than those of the short ones. This study examined the microvibration control performance of the proposed active piezoelectric mass damper (APMD) or driver for tall platforms subjected to internal automated guided vehicle- (AGV-) induced floor vibrations with larger intensity and broader bandwidth in liquid-crystal-display (LCD) fabrication factories (fabs). The APMD did not require auxiliary spring and damping elements to tune the natural frequency and reduce the stroke of the mass block as required by typical active tuned mass dampers (ATMDs). The motion equation of the proposed analytical model including a continuous three-span beam (or floor) system and an active-controlled tool platform under the action of the AGV moving forces was derived. The APMD, consisting of piezoelectric stacks and a mass block, was installed on the platform subjected to the base rotation excitation, which could be attributed to the uneven vertical floor vibrations induced by AGVs. Moreover, the direct output feedback control algorithm was adopted to determine the optimal feedback gain matrix for calculating the active control force. Time history analyses of the continuous beam-platform model under different AGV weights moving at the same speed were performed, and the corresponding velocity vibration spectra of the floor and platform were further obtained through one-third octave band spectrum analysis. Numerical simulation results revealed that the microvibrations of the platform without APMD generally exceed the VC-A level regardless of the AGV weight. Significant reductions of over 90% on the platform microvibrations could be achieved after the platform was implemented with the APMD, and vibrations met the desired vibration limit (VC-B). Moreover, the APMD exhibits comparable microvibration control performance to the ATMD and requires less mass of the mass block, stroke, and applied voltage under the same active control force. In real-life high-tech production fabs, AGV-induced platform microvibrations occur all the time; therefore, the proposed APMD with less power consumption could be an economical and feasible approach for persistent microvibration control of tall platforms in LCD fabs.

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“…With advancements in control methods, a shake table substructuring experiment is a viable option for evaluation of seismic performance of large or heavy structures that exceed the limitations of experimental apparatuses. Currently, shake table substructuring experiments are being actively investigated for earthquake engineering purposes [24][25][26][27][28][29]. To perform the substructuring experiment, two schemes can be used for achieving real-time interaction between the physical and numerical domains.…”

Section: Introductionmentioning

confidence: 99%

Enhancements of Nonlinear Substructuring Control for Shake Table Experiments on Severely Damaged Structures

Enokida

Kajiwara

2023

Structural Control and Health Monitoring

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This study introduces enhancements for nonlinear substructuring control (NLSC) to achieve simultaneous control of acceleration and displacement in shake table substructuring experiments with severely damaged structures. Although shake table control is greatly affected by a specimen placed on its top and its nonlinear characteristics, accurate control, even with nonlinear characteristics, is essential for experimental purposes. The NLSC was developed for a dynamically substructured system (DSS) scheme involving nonlinear substructures, and its first application to a shake table experiment was performed on a one-storey steel frame. In the experiment, NLSC realised simultaneous control of table acceleration and displacement with a slight nonlinear characteristic within the frame, although its performance degraded as the nonlinearity became stronger. To address this degradation issue, this study introduces two techniques for enhancing NLSC shake table substructuring experiments. One is a composite filtering technique to minimise noise-contaminating displacement data fed back to the table control so that the error feedback action in NLSC can be fully utilised. The other involves a new linear model that is assumed to be more highly damped than the actual system to enhance the stability robustness of NLSC against nonlinear characteristics. After a series of numerical examinations, this study experimentally examined the enhancements on actual shake table experiments using a steel frame. Using the NLSC with the enhancements, a substructuring experiment was successfully conducted; moreover, the NLSC realised simultaneous control of the table acceleration and displacement with nearly 100% accuracy, even with severe nonlinear characteristics.

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Real-time hybrid testing of a structure with a piezoelectric friction controllable mass damper by using a shake table

Cited by 8 publications

References 44 publications

Active vibration control for high‐rise buildings using displacement measurements by image processing

Active vibration control for high‐rise buildings using displacement measurements by image processing

Active Microvibration Control of Tool Platforms Installed on the Floors Subjected to Moving Vehicles in Industrial Factories

Enhancements of Nonlinear Substructuring Control for Shake Table Experiments on Severely Damaged Structures

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