Hybrid platform for high-tech equipment protection against earthquake and microvibration

Xu, You Lin; Li, Bin

doi:10.1002/eqe.564

Cited by 33 publications

(17 citation statements)

References 8 publications

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“…Stöbener (2006) suggested using active vibration isolation platforms for protecting highly sensitive measurement equipment like atomic force microscopes from harmful vibrations. Xu and Li (2006) proposed the use of hybrid platforms for the protection of high-tech equipment such as semiconductors and optical microscopes from earthquakes. Semi-active vibration isolation was suggested by Gavin and Zaicenco (2007) in order to protect vibration-sensitive equipment from near-fault ground motions.…”

Section: Seismic Isolation and The Distribution Of Floor Accelerationsmentioning

confidence: 99%

Protecting vibration-sensitive contents: an investigation of floor accelerations in seismically isolated buildings

Alhan

Şahin

2011

Bull Earthquake Eng

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For the public welfare and safety, buildings such as hospitals, industrial facilities, and technology centers need to remain functional at all times; even during and after major earthquakes. The values of these buildings themselves may be insignificant when compared to the cost of loss of operations and business continuity. Seismic isolation aims to protect both the integrity and the contents of a structure. Since the tolerable acceleration levels are relatively low for continued services of vibration-sensitive high-tech contents, a better understanding of acceleration response behaviors of seismically isolated buildings is necessary. In an effort to shed light to this issue, following are investigated via bi-directional time history analyses of seismically isolated benchmark buildings subject to historical earthquakes: (i) the distribution of peak floor accelerations of seismically isolated buildings subject to seismic excitations in order to find out which floors are likely to sustain the largest accelerations; (ii) the influence of equivalent linear modeling of isolation systems on the floor accelerations in order to find out the range of possible errors introduced by this type of modeling; (iii) the role of superstructure damping in reducing floor accelerations of seismically isolated buildings with flexible superstructures in order to find out whether increasing the superstructure damping helps reducing floor accelerations notably. Influences of isolation system characteristics and superstructure flexibility are both taken into account.

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Section: Seismic Isolation and The Distribution Of Floor Accelerationsmentioning

confidence: 99%

Protecting vibration-sensitive contents: an investigation of floor accelerations in seismically isolated buildings

Alhan

Şahin

2011

Bull Earthquake Eng

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“…Finally, with the equipment isolation approach, the isolation layer is directly installed between the equipment and the structural floor. This approach is particularly cost effective for cases where the protection of certain critical and vibration-sensitive equipment is required (Xu and Li, 2006;Lu and Lin, 2009).…”

Section: Introductionmentioning

confidence: 98%

Seismic simulation test of equipment protection by using a fuzzy-controlled smart isolation system

Hung

Lin

2013

Journal of Vibration and Control

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Vibration-sensitive equipment mounted on a building structure can be severely damaged by a moderate earthquake, due to the dynamic amplification effect of the primary structure. To alleviate this problem, the seismic protection of such equipment using a fuzzy-controlled piezoelectric equipment isolation system (PEIS) is investigated experimentally in this study by conducting a shaking table test. In the test, the PEIS is placed on top of a full-scale steel frame that is used to simulate the dynamic effect of the primary structure, while the mass of the equipment on the PEIS is simulated by rigid mass blocks. Through controlling the driving voltage of the embedded piezoelectric actuator, the friction damping and motions of the PEIS are attenuated by the fuzzy controller. The implementation of the proposed fuzzy-controlled system requires only one displacement sensor, and thus the system is very easy to implement and less costly than comparable systems. The results of the experiment suggest that, for earthquakes with high intensities or strong near-fault characteristics, the studied system is able to substantially reduce the demand for isolation displacement while maintaining superior isolation efficiency. This implies that the proposed system is particularly desirable for cases of equipment isolation in which the installation space is limited.

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“…Yang and Agrawal [8] performed an extensive numerical study on the possible use of hybrid isolation systems for both microvibration control and seismic response control of high-tech equipment. Xu and Li [9] recently proposed a large-scale two-layer hybrid platform, which works as a passive platform aiming at mitigating acceleration response of a batch of high-tech equipment during an earthquake and functioning as an actively controlled platform that intends to reduce velocity response of a batch of high-tech equipment under a normal working condition. The performance of the hybrid platform is promising but the study is an analytical study only.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a hybrid platform for high‐tech equipment protection against earthquake and microvibration

Zhang

2007

Earthq Engng Struct Dyn

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SUMMARYThis paper presents an experimental study to explore the possibility of using a hybrid platform to ensure the functionality of high-tech equipment against microvibration and to protect high-tech equipment from damage when an earthquake occurs. A three-storey building model and a hybrid platform model were designed and manufactured. The two-layer hybrid platform, on which the high-tech equipment is placed, was installed on the first floor of the building to work as a passive platform aiming at abating acceleration response of the equipment during an earthquake and functioning as an actively controlled platform that intends to reduce velocity response of the equipment under a normal working condition. For the hybrid platform working as a passive platform, it was designed in such a way that its stiffness and damping ratio could be changed, whereas for the hybrid platform functioning as an active platform, a piezoelectric actuator with a sub-optimal velocity feedback control algorithm was used. A series of shaking table tests, traffic-induced vibration tests and impact tests were performed on the building with and without the platform to examine the performance of the hybrid platform. The experimental results demonstrate that the hybrid platform is feasible and effective for high-tech equipment protection against earthquake and microvibration.

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Hybrid platform for high-tech equipment protection against earthquake and microvibration

Cited by 33 publications

References 8 publications

Protecting vibration-sensitive contents: an investigation of floor accelerations in seismically isolated buildings

Protecting vibration-sensitive contents: an investigation of floor accelerations in seismically isolated buildings

Seismic simulation test of equipment protection by using a fuzzy-controlled smart isolation system

Experimental study of a hybrid platform for high‐tech equipment protection against earthquake and microvibration

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