Development of adaptive seismic isolators for ultimate seismic protection of civil structures

Li, Jianchun; Li, Yancheng; Li, Weihua; Samali, Bijan

doi:10.1117/12.2009626

Cited by 35 publications

(37 citation statements)

References 28 publications

(48 reference statements)

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“…MR elastomer working in field-active mode can be used to design various actuators [75,77]. Examples of shear mode devices include vibration absorbers [62][63][64][65][66][67][68][69][70], vibration isolators [16,71,[89][90] and base isolators [20,[78][79]93]. Examples of squeeze/elongation mode devices are vibration absorbers [64][65], engineering mounts [76] and compressive spring elements [22].…”

Section: Operation Modesmentioning

confidence: 99%

“…Being adaptive for wide range of earthquakes is of great importance due to the versatile nature of the earthquake. Detailed explanation of the vulnerability of traditional base isolation system can be found in [20,[78][79]. To address this issue, several researchers have explored the feasibility in using MR elastomer into base isolation system of civil structures.…”

Section: Base Isolators For Civil Engineering Applicationmentioning

confidence: 99%

“…Variable stiffness and damping isolator proposed by Behrooz et al [93,111]: (a) cross section view; and (b) prototype. Li et al [78][79] proposed the first laminated base isolator containing 47 layers of MR elastomer sheets with thickness of 2mm each and diameter of 140mm, figure 26. Between the MR elastomer layers are 46 steel sheets with same diameter and thickness of 1mm.…”

Section: Base Isolators For Civil Engineering Applicationmentioning

confidence: 99%

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A state-of-the-art review on magnetorheological elastomer devices

Li¹,

Li²,

Li³

et al. 2014

Smart Mater. Struct.

Self Cite

522

385

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During the last few decades, magnetorheological (MR) elastomers have attracted a significant amount of attention for their enormous potential in engineering applications. Because they are a solid counterpart to MR fluids, MR elastomers exhibit a unique field-dependent material property when exposed to a magnetic field, and they overcome major issues faced in magnetorheological fluids, e.g. the deposition of iron particles, sealing problems and environmental contamination. Such advantages offer great potential for designing intelligent devices to be used in various engineering fields, especially in fields that involve vibration reduction and isolation. This paper presents a state of the art review on the recent progress of MR elastomer technology, with special emphasis on the research and development of MR elastomer devices and their applications. To keep the integrity of the knowledge, this review includes a brief introduction of MR elastomer materials and follows with a discussion of critical issues involved in designing magnetorheological elastomer devices, i.e. operation modes, coil placements and principle fundamentals. A comprehensive review has been presented on the research and development of MR elastomer devices, including vibration absorbers, vibration isolators, base isolators, sensing devices, and so on. A summary of the research on the modeling mechanical behavior for both the material and the devices is presented. Finally, the challenges and the potential facing magnetorheological elastomer technology are discussed, and suggestions have been made based on the authors' knowledge and experience. Abstract:During last decades, magnetorheological (MR) elastomer has attracted significant amount of attention for its enormous potentials in engineering applications. Being a solid counterpart of MR fluids, MR elastomers exhibit unique field-dependent material property when being exposed to magnetic field, in meanwhile overcoming major issues faced in magnetorheological fluids, e.g. deposition of iron particles, sealing problem and environmental contamination. Such advantages offer great potentials for designing intelligent devices to be used in various engineering fields, especially for vibration reduction and isolation. This paper presents a state-of-the-art review on the recent progress of MR elastomer technology, with special emphasis on research and development of MR elastomer devices and their applications. To keep the integrity of the knowledge, the review includes a brief introduction of the MR elastomer materials and follows by discussion of critical issues in designing magnetorheological elastomer devices, i.e. operation modes, coil placements and principle fundamentals. A comprehensive review has been presented research and development of MR elastomer devices, including vibration absorbers, vibration isolators, base isolators, sensing devices and so on. Summary of research on modeling mechanical behavior for both material and devices are presented. Finally, challenges and potentials facing ...

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Section: Operation Modesmentioning

confidence: 99%

Section: Base Isolators For Civil Engineering Applicationmentioning

confidence: 99%

Section: Base Isolators For Civil Engineering Applicationmentioning

confidence: 99%

See 1 more Smart Citation

A state-of-the-art review on magnetorheological elastomer devices

Li¹,

Li²,

Li³

et al. 2014

Smart Mater. Struct.

Self Cite

522

385

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“…Capable of instantly changing its shear stiffness and damping property, by altering the applied currents, the proposed MRE base isolator is able to introduce a considerable adaptability into the base isolator and thus can overcome the shortcomings associated with traditional passive base isolators [10][11].…”

Section: Device Asmentioning

confidence: 99%

Design and experimental testing of an adaptive magneto-rheological elastomer base isolator

2013

2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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Magnetorheological elastomer (MRE) is known for its field-sensitive shear modulus and damping property when it is exposed to a magnetic field. It has a great potential for the development of vibration reduction devices. Many research, mostly in mechanical engineering, have been focused on different kinds of vibration absorbers and vibration isolators, however few research addresses its potential in base isolation system in civil engineering application. The objective of this paper is to pilot the design and experimental testing of a novel device, an adaptive MRE base isolator, for the development of smart base isolation system. A large-scale design of the novel device with unique laminated structure of steel and MR elastomer layers is adopted. Detailed procedures on designing such adaptive base isolator are introduced. An innovative design on the magnetic circuit, with aim to provide strong and uniform magnetic field to the multi-layer MRES, is proposed to incorporate into the device design. Experimental investigation is conducted to examine its behavior under various cycling loadings when it is applied with different current inputs. Experimental results indicated that the force increase and the stiffness increase of the novel device are about 45% and 37%, respectively. To conclude, the MR elastomer base isolator will be a promising candidate to facilitate the development of adaptive base isolation system for civil structures. This conference paper is available at Research Online: http://ro.uow.edu.au/eispapers/1249  Abstract-Magnetorheological elastomer (MRE) is known for its field-sensitive shear modulus and damping property when it is exposed to a magnetic field. It has a great potential for the development of vibration reduction devices. Many research, mostly in mechanical engineering, have been focused on different kinds of vibration absorbers and vibration isolators, however few research addresses its potential in base isolation system in civil engineering application. The objective of this paper is to pilot the design and experimental testing of a novel device, an adaptive MRE base isolator, for the development of smart base isolation system. A large-scale design of the novel device with unique laminated structure of steel and MR elastomer layers is adopted. Detailed procedures on designing such adaptive base isolator are introduced. An innovative design on the magnetic circuit, with aim to provide strong and uniform magnetic field to the multi-layer MRES, is proposed to incorporate into the device design. Experimental investigation is conducted to examine its behavior under various cycling loadings when it is applied with different current inputs. Experimental results indicated that the force increase and the stiffness increase of the novel device are about 45% and 37%, respectively. To conclude, the MR elastomer base isolator will be a promising candidate to facilitate the development of adaptive base isolation system for civil structures.

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“…shear modulus, when external magnetic field is applied. The proposed adaptive base isolator, inheriting critical laminated design, possesses large compressive stiffness with controllable lateral stiffness [16][17][18][19][20][21], shown in figure 5. Two prototypes of MRE adaptive isolators, i.e.…”

Section: Adaptive Magnetorheological Elastomer Basementioning

confidence: 99%

Future Intelligent Civil Structures: Challenges and Opportunities

Askari

et al. 2014

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

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-An intelligent civil structure offers ultimate protection to its structure, contents and occupants in terms of safety and functionality against undesired dynamic loadings and structural deficiency. In this paper, the concept of the future intelligent civil structure featuring self-adaptive, selfprognostic, self-sensing, self-powering and self-repairing abilities, is proposed. A decade research efforts from Centre for Built Infrastructure Research, University of Technology Sydney, towards the development and concept proof of such intelligent structure is reviewed.

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Development of adaptive seismic isolators for ultimate seismic protection of civil structures

Cited by 35 publications

References 28 publications

A state-of-the-art review on magnetorheological elastomer devices

A state-of-the-art review on magnetorheological elastomer devices

Design and experimental testing of an adaptive magneto-rheological elastomer base isolator

Future Intelligent Civil Structures: Challenges and Opportunities

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