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Dynamical Experiment Research on New Seismic Isolation Bearings with SMA Wires

Deng Zongcai,Sun Hongjun,Liu Chunguo,Niu Kun,Deng Hongliang

Strategic Study of CAE 2005, Volume 7, Issue 12, Pages 61-68

Abstract:

As the aim of improving the utilization ratio of SMAs in SMA-rubber seismic isolation bearings, severaldifferent SMA-rubber seismic isolation bearings were designed, and energy dissipation experiments wereisolation bearings including level displacement amplitude, level loading frequency and vertical loadResult showed that the new SMA-rubber seismic isolation bearings have better hysteresis and energy dissipationIt provided the base to optimize the SMA-rubber seismic isolation bearings.

Keywords： shape memory alloy seismic isolation bearings initial stiffness hysteresis energy dissipation equivalent

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Innovative seismic retrofitting strategy of added stories isolation system

Min-Ho CHEY, J. Geoffrey CHASE, John B. MANDER, Athol J. CARR

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 1, Pages 13-23 doi: 10.1007/s11709-013-0195-9

Abstract: The seismic performance of “added stories isolation” (ASI) systems are investigated for 12-story momentThe isolation layer, as a core design strategy, is optimally designed based on optimal TMD design principle, entailing the insertion of passive flexible laminated rubber bearings to segregate two or four upperanalyses are used to compute various response performances and reduction factors across a wide range of seismicResults show that ASI systems can effectively manage seismic response for multi-degree-of freedom (MDOF

Keywords： added stories seismic isolation tuned mass damper parametric optimization statistical method

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Theoretical and experimental study on seismic response control on top of Three-Gorges ship lift towersusing magnetorheological intelligent isolation system and its key technique

Weilian QU, Jianwei TU

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 1, Pages 32-41 doi: 10.1007/s11709-009-0003-8

Abstract: This paper proposes a roof magnetorheological (MR) intelligent isolation system to prevent the seismicthe fundamental semi-active control equation for the Three-Gorges ship lift where the MR intelligent isolationexperimental model of the ship lift was given, the vibrating table experiment of the MR intelligent isolationIt was proven that the MR intelligent isolation system with proper control strategy can greatly reducethe seismic whipping effect on the top workshop of the ship lift and be simple and effective enough

Keywords： Three-Gorges ship lift tower whipping effect magnetorheological (MR) intelligent isolation system neural

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The development on seismic design and evaluation of CGNPC after Fukushima accident

Mao Qing,Wu Yingxi,Zhang Jian,Meng Ajun,Zhang Tao,Yang Chunju,Liu Fang

Strategic Study of CAE 2013, Volume 15, Issue 4, Pages 46-51

Abstract:

This paper introduced the seismic design requirements of nuclear powerplant, the seismic design situation of the unit in construction or in service, and the serious consequenceThen, it described in brief the measures on seismic analysis taken by countries who own nuclearFinally, this paper presented some steps for the new nuclear power plants at the seismic design and evaluationto enhance the seismic capacity of nuclear power plants through technical means.

Keywords： seismic design basis beyond design basis earthquake seismic margin assessment（SMA） seismic isolation

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Rolling-element bearings in China: From ancient times to the 20th century

Lie SUN,Ang LI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 1, Pages 33-43 doi: 10.1007/s11465-016-0373-2

Abstract:

The development of rolling-element bearings in China has spanned a long period.several typical and important cases, the present article reconstructs the history of rolling-element bearingsin China by dividing it into four stages according to the various characteristics of the bearings.The first stage represents the origin of rolling bearings in China, which remains controversial becauseas replacement for traditional sliding bearings.

Keywords： bearing movement rolling-element bearing China early rolling bearings technology transfer

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The earthquake threat and countermeasures to the safety of nuclear power plants

Zhou Fulin,Tan Ping,Liu Dewen

Strategic Study of CAE 2013, Volume 15, Issue 4, Pages 36-40

Abstract:

Nuclear energy is a carbon-free, clean and efficient energy. It is very important in the progress of human civilization and modern development of the world. However, there are still some problems such as nuclear leak and nuclear waste. In this paper, the world's nuclear energy utilization and nuclear power plant constructions are reviewed and plans are forecasted. The basic reason of previous nuclear power plant accidents in history is summarized. Taking 2011 Tohuku earthquake -fukushima nuclear power station accident as an example, threats to the nuclear power plant by earthquake are investigated and impacts on social, economic and ecological environment caused by nuclear power station accident are analyzed. This paper drew lessons from previous accidents and put forward a variety of countermeasures which are from both the technical and management aspects. This paper also put forward some suggestions. Security measures of the existing nuclear power plants should be assessed carefully. The long-term construction plan of the nuclear power plant should be improved. In addition, emergency management mechanism of the nuclear power plant can be enhanced in the future. The earthquake monitoring and earthquake early-warning system is critical and promoted to be established widely. The nuclear probability safety analysis (PSA) could be investigated in depth. The security education of the public should be continuously popularized and disaster drills be carried out regularly. International cooperation and communication are also advocated to be strengthened. All these measures can be significant in human process to explore nuclear energy correctly. We also appeal people all over the world to respect the nature, enjoy the nature, and to create and enjoy the new civilization of human beings.

Keywords： nuclear power plant seismic hazard tsunami location safety base isolation energy dissipation three-dimensionalbase isolation

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Parametric study on the Multangular-Pyramid Concave Friction System (MPCFS) for seismic isolation

Wei XIONG, Shan-Jun ZHANG, Li-Zhong JIANG, Yao-Zhuang LI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5, Pages 1152-1165 doi: 10.1007/s11709-020-0659-7

Abstract: This new introduced MPCFS system has some distinctive features when compared with conventional isolationincorporated in a steel-frame structural model, which is subjected to three chosen earthquakes, to verify its seismicisolation.The simulations testify the significant seismic isolation of the MPCFS.techniques, may be a promising tool for seismic isolation of near-fault earthquake prone zones.

Keywords： seismic isolation variable frequency near-fault earthquake numerical study Multangular-Pyramid Concave

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Application of Porous Aerostatic Bearings in Three-axis Table

Du Jinming

Strategic Study of CAE 2005, Volume 7, Issue 1, Pages 65-68

Abstract:

Aerostatic bearings have been applied widely in aviation, aerospace and precision electronics.Porous aerostatic bearings have higher load capacity, static stiffness and highed damping than otherrestricted bearings.aerostatic bearings.The results show the load capacity of porous aerostatic bearings is higher than orifice aerostatic bearings

Keywords： aerostatic bearings porous orifice restricted three-axis table

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H_∞ control in the frequency domain for a semi-active floor isolation system

Yundong SHI, Tracy C BECKER, Masahiro KURATA, Masayoshi NAKASHIMA

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3, Pages 264-275 doi: 10.1007/s11709-013-0214-x

Abstract: A floor isolation system installed in a single floor or room in a fixed base structure is designed toWith this configuration, the input motions to the floor isolation from the ground motions are filteredThe floor isolation system should minimize the acceleration to protect equipment; however, displacementSemi-active control with an control was adopted for the floor isolation system and a new input shapingA series of shake table tests for a semi-active floor isolation system using rolling pendulum isolators

Keywords： semi-active floor isolation H_∞ control MR damper shaping filter shaking table

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Isolation and application of predatory

Ran Yu, Shiwen Zhang, Zhoukai Chen, Chuanyang Li

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 1, doi: 10.1007/s11783-017-0900-3

Abstract: Indigenous predatory BALO strains were successfully isolated from activated sludge. Sludge SRF and CST were significantly reduced by BALOs induced biolysis process. The increase of BALO input dosage promoted the sludge biolysis efficiency. Sludge biolysis disintegrated flocs and lysed cells for internal water release. The optimal sludge biolysis time was 24 h and no pH adjustment was needed. -and-like organisms (BALOs) are a group of ubiquitous and obligate predatory bacteria and commonly used as biocontrol agents. In this study, an efficient, environmental-friendly, and convenient BALOs encouraged municipal waste sludge biolysis pretreatment technique was developed and investigated for dewaterability enhancement of excess waste sludge. The indigenous predatory BALOs were successfully isolated from the sludge for biolysis treatment. Without any chemical addition or pH adjustment, the sludge specific resistance (SRF) and capillary suction time (CST) were significantly reduced by as high as 53.4% and 23.8%, respectively within 24 h’s treatment, which would further be lowered with the increase of BALOs input dosage. However, the continuous extension of reaction time would worsen the sludge dewaterability. The decreases of SRF and CST accompanied with the increases of sludge disintegration degree and soluble chemical oxygen demand, nitrogen, and phosphorus concentrations all emphasized the contributions of BALOs’ predation activities to sludge disturbance, cell lysis, and consequently the release of sludge intracellular water to finally effectively improve the sludge dewaterability and disposal efficiency.

Keywords： Bdellovibrio-and-like organisms (BALOs) Biolysis Activated sludge Dewaterability Predation

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Novel polymorphic EST-based microsatellite marker isolation and characterization from

Manosh Kumar BISWAS,Peng CHEN,Mohamed Hamdy AMAR,Xiuxin DENG

Frontiers of Agricultural Science and Engineering 2015, Volume 2, Issue 1, Pages 60-65 doi: 10.15302/J-FASE-2015048

Abstract: Novel simple sequence repeat (SSR) markers were developed to evaluate their utility for genetic diversity and breeding studies of and related species. A total of 108 primer pairs were characterized by PCR amplification experiments. Among these, 61 were polymorphic and transferable to other citrus species. The number of alleles per locus ranged from 2 to 6, with an average of 2.37 alleles per locus. The expected heterozygosity and observed heterozygosity ranged from 0 to 0.83 and 0 to 1.00, respectively. These novel polymorphic SSR markers will be useful for citrus cultivar identification and evaluation as well as breeding studies.

Keywords： microsatellite polymorphism Poncirus trifoliata

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Aseismic smart building isolation systems under multi-level earthquake excitations: Part II, energy-dissipation

Min-Ho CHEY,J. Geoffrey CHASE,John B. MANDER,Athol J. CARR

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 3, Pages 297-306 doi: 10.1007/s11709-015-0308-8

Abstract: Based on the performance results of the previously suggested smart building isolation systems (1st companionstory/structural damage demands over realistic suites of earthquake ground motion records, representing seismicresults of this study include the identification of differences in the mechanisms by which smart building isolationLess variability is also seen for the semi-active isolation systems, indicating an increased robustness

Keywords： smart building isolation story and structural energy-dissipation damage assessment

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Li Aiqun: Research and Practice of High Performance Seismic Isolation Structure (2019-11-10)

李爱群(高级职称)

20 Jan 2021

Keywords：城镇建设

Review of the damage mechanism in wind turbine gearbox bearings under rolling contact fatigue

Yun-Shuai SU, Shu-Rong YU, Shu-Xin LI, Yan-Ni HE

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 4, Pages 434-441 doi: 10.1007/s11465-018-0474-1

Abstract: Wind turbine gearbox bearings fail with the service life is much shorter than the designed life.Gearbox bearings are subjected to rolling contact fatigue (RCF) and they are observed to fail due to

Keywords： rolling contact fatigue (RCF) white etching area (WEA) white etching crack (WEC) adiabatic shear band (ASB)

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Aseismic smart building isolation systems under multi-level earthquake excitations: Part I, conceptual

Min-Ho CHEY,J. Geoffrey CHASE,John B. MANDER,Athol J. CARR

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 3, Pages 286-296 doi: 10.1007/s11709-015-0307-9

Abstract: The isolated structure’s upper stories can be utilized as a large scaled TMD, and the isolation layera core design point, between the separated upper and lower stories entails the insertion of rubber bearingsThe seismic performance of the suggested isolation systems are investigated for 12-story reinforced concreteperformances across a wide range of seismic hazard intensities.Results show that semi-active smart building isolation systems can effectively manage seismic response

Keywords： tuned mass damper smart building isolation resettable device non-linear statistical assessment

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Title Author Date Type Operation

Dynamical Experiment Research on New Seismic Isolation Bearings with SMA Wires

Deng Zongcai,Sun Hongjun,Liu Chunguo,Niu Kun,Deng Hongliang

Journal Article

Innovative seismic retrofitting strategy of added stories isolation system

Min-Ho CHEY, J. Geoffrey CHASE, John B. MANDER, Athol J. CARR

Journal Article

Theoretical and experimental study on seismic response control on top of Three-Gorges ship lift towersusing magnetorheological intelligent isolation system and its key technique

Weilian QU, Jianwei TU

Journal Article

The development on seismic design and evaluation of CGNPC after Fukushima accident

Mao Qing,Wu Yingxi,Zhang Jian,Meng Ajun,Zhang Tao,Yang Chunju,Liu Fang

Journal Article

Rolling-element bearings in China: From ancient times to the 20th century

Lie SUN,Ang LI

Journal Article

The earthquake threat and countermeasures to the safety of nuclear power plants

Zhou Fulin,Tan Ping,Liu Dewen

Journal Article

Parametric study on the Multangular-Pyramid Concave Friction System (MPCFS) for seismic isolation