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Dynamic modeling and coupling characteristics of rotating inclined beams with twisted-shape sections

Jin ZENG, Chenguang ZHAO, Hui MA, Bangchun WEN

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 3,   Pages 374-389 doi: 10.1007/s11465-019-0580-8

Abstract: beam; however, few considered the effect of the elastic-support boundary and the quantification of modalangles on the degree of coupling among flapwise, chordwise, and torsional directions were quantified via modalstrain energy ratios.

Keywords： elastic-support boundary     pre-twisted beam     semi-analytic method     modal strain energy ratio     torsional vibration    

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Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration

Zhigen WU, Guohua LIU, Zihua ZHANG

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 112-120 doi: 10.1007/s11709-010-0069-3

Abstract: A novel damage assessment method based on the decay ratio of acceleration signals (DRAS) was proposedIn addition, a new method was compared with the linear modal-based damage assessment using wavelet transformWith better sensibility of damage than modal parameters, probably DRAS is a promising damage indicator

Keywords： damage assessment     decay ratio of acceleration signals (DRAS)     wavelet transform (WT)     modal analysis     reinforced    

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network for damage detection in functionally graded carbon nanotube-reinforced composite plates using modalkinetic energy

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1453-1479 doi: 10.1007/s11709-021-0767-z

Abstract: The elemental modal kinetic energy (MKE) values, calculated from natural frequencies and translational

Keywords： deep feed-forward neural networks     functionally graded carbon nanotube-reinforced composite plates     modalkinetic energy    

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An efficient two-stage approach for structural damage detection using meta-heuristic algorithms and group method of data handling surrogate model

Hamed FATHNEJAT, Behrouz AHMADI-NEDUSHAN

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 907-929 doi: 10.1007/s11709-020-0628-1

Abstract: In the first stage, in order to locate the damage accurately, the performance of the modal strain energyIn the second stage, to estimate the damage extent, the sensitivity of most used modal properties dueto damage, such as natural frequency and flexibility matrix is compared with the mean normalized modalstrain energy (MNMSE) of suspected damaged elements.Moreover, a modal property change vector is evaluated using the group method of data handling (GMDH)

Keywords： two-stage method     modal strain energy     surrogate model     GMDH     optimization damage detection    

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Multiple damage detection in complex bridges based on strain energy extracted from single point measurement

Alireza ARABHA NAJAFABADI, Farhad DANESHJOO, Hamid Reza AHMADI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 722-730 doi: 10.1007/s11709-020-0624-5

Abstract: Strain Energy of the structure can be changed with the damage at the damage location.The use of modal-based methods to identify damage in complex bridges is always associated with problemseffects of higher modes and the adverse effect of operational conditions on the extraction of structural modalThen two damage detection indicators were developed based on strain energy variations.Indicators of the strain energy extracted from displacement influence line and the strain energy extracted

Keywords： damage detection     strain energy     influence line     complex bridges     rotation displacement    

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Stress-strain relationship of recycled self-compacting concrete filled steel tubular column subjected

Feng YU, Cheng QIN, Shilong WANG, Junjie JIANG, Yuan FANG

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 760-772 doi: 10.1007/s11709-020-0618-3

Abstract: In this study, 21 specimens were designed and experimental studies on the stress-strain relationshipRecycled coarse aggregate replacement ratio, concrete strength grade, length to diameter ratio and eccentricThe corresponding stress-strain relationship curves were used to analyze the influence of concerned parametersThe experimental results show that the strain of the eccentric compression stress-strain curves increasewith the increase of recycled coarse aggregate replacement ratio and concrete strength grade.

Keywords： columns     recycled self-compacting concrete     eccentric compression     recycled coarse aggregate replacement ratio     stress-strain relationship    

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Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

Rwayda Kh. S. AL-HAMD, Martin GILLIE, Safaa Adnan MOHAMAD, Lee S. CUNNINGHAM

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 664-674 doi: 10.1007/s11709-020-0620-9

Abstract: subjected to high temperature, the degree of in-service loading, commonly expressed as the loading ratioIn particular, the loading ratio may be pivotal in relation to the phenomenon of load-induced thermalstrain.Despite its potentially pivotal role, to date, the influence of the loading ratio on both material andThe model incorporates a proposed constitutive model accounting for load-induced thermal strain and this

Keywords： concrete     finite elements     fire     load-induced thermal strain     punching shear    

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Damage detection in beam-like structures using static shear energy redistribution

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 12,   Pages 1552-1564 doi: 10.1007/s11709-022-0903-4

Abstract: In this study, a static shear energy algorithm is presented for the damage assessment of beam-like structuresAccording to the energy release principle, the strain energy of a damaged element suddenly changes whenTherefore, the change in the static shear energy is employed to determine the damage locations in beam-likeThe static shear energy is derived from the spectral factorization of the elementary stiffness matrixThe advantage of using shear energy as opposed to total energy is that only a few deflection data points

Keywords： damage detection     beam structure     strain energy     static displacement variation     energy damage index    

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Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine

Pengxing YI,Peng HUANG,Tielin SHI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 388-402 doi: 10.1007/s11465-016-0404-z

Abstract: This paper examines the distinctive modal properties of WTGs through finite element (FE) and experimentalmodal analyses.First, a whole system model is developed to investigate the first 10 modal frequencies and mode shapesSecond, the FE modal results are validated through experimental modal analyses of a 1.5 WM WTG usingThe natural frequencies from the FE and experimental modal analyses show favorable agreement and reveal

Keywords： wind turbine gearbox     modal analysis     finite element analysis     modal frequency     bearing equivalence    

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Heating energy performance and part load ratio characteristics of boiler staging in an office building

Da Young LEE, Byeong Mo SEO, Yeo Beom YOON, Sung Hyup HONG, Jong Min CHOI, Kwang Ho LEE

Frontiers in Energy 2019, Volume 13, Issue 2,   Pages 339-353 doi: 10.1007/s11708-018-0596-5

Abstract: Commercial buildings account for significant portions of the total building energy in South Korea andthus a variety of research on the boiler operation related to heating energy in office buildings hasHowever, most of the researches have been conducted on the boiler itself, i.e., the part load ratio characteristicsIn this study, the part load ratio and the operating characteristics of gas boiler have been analyzedfound to be in a part load ratio range of 0 through 40% and thus energy consumption is significantly

Keywords： EnergyPlus     boiler     part load ratio     gas consumption     office building     boiler staging    

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Early-life famine exposure, adulthood obesity patterns, and risk of low-energy fracture

Frontiers of Medicine doi: 10.1007/s11684-023-1023-9

Abstract: but the association of early-life undernutrition combined with adulthood obesity patterns with low-energyassessed using the body mass index (BMI), and abdominal obesity was evaluated with the waist-to-hip ratioLow-energy fracture was defined as fracture occurring after the age of 40 typically caused by falls fromfamine exposure interacts with adulthood general obesity and significantly increases the risk of low-energy

Keywords： famine     obesity     body mass index     waist-to-hip ratio     low-energy fracture    

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The Analysis on Output-input Ratio of Artificial Supplementary Energy in Agro-eco-engineering

Bian Yousheng,Liu Yingkun,Bian Jing

Strategic Study of CAE 2006, Volume 8, Issue 8,   Pages 28-32

Abstract:

The output-input ratio of the artificial Supplementary energy reflects the function and productivityThe output-input ratio for artificial supplementary energy of Henan Xinxian´10 peasant families

Keywords： agro-eco-engineering     output-input ratio of energy    

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Experimental and computational validation of a scaled train tunnel model using modal analysis

Janice B. D’SOUZA, Sangarapillai KANAPATHIPILLAI

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4,   Pages 420-428 doi: 10.1007/s11465-013-0281-7

Abstract: The modal properties for the 300 Hz to 1500 Hz range, including resonances and mode shapes were identified

Keywords： reverberation time     acoustic environment     modal properties     resonances    

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Variational mode decomposition based modal parameter identification in civil engineering

Mingjie ZHANG, Fuyou XU

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1082-1094 doi: 10.1007/s11709-019-0537-3

Abstract: An out-put only modal parameter identification method based on variational mode decomposition (VMD) isdeveloped VMD technique is utilized to decompose the free decay response (FDR) of a structure into to modalA novel procedure is developed to calculate the instantaneous modal frequencies and instantaneous modalThe proposed identification method can straightforwardly extract the mode shape vectors using the modalparameter variation, and amplitude-dependent modal parameters, etc.

Keywords： modal parameter identification     variational mode decomposition     civil structure     nonlinear system     closely    

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ZnO nanorefrigerant in R152a refrigeration system for energy conservation and green environment

D. SENDIL KUMAR,R. ELANSEZHIAN

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 1,   Pages 75-80 doi: 10.1007/s11465-014-0285-y

Abstract: The performance of the system was significantly improved with 21% less energy consumption when 0.5%vHence ZnO nanoparticles could be used in refrigeration system to considerably reduce energy consumption

Keywords： ZnO nanorefrigerant     reduced GWP     COP     pressure ratio green energy    

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Title Author Date Type Operation

Dynamic modeling and coupling characteristics of rotating inclined beams with twisted-shape sections

Jin ZENG, Chenguang ZHAO, Hui MA, Bangchun WEN

Journal Article

Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration

Zhigen WU, Guohua LIU, Zihua ZHANG

Journal Article

network for damage detection in functionally graded carbon nanotube-reinforced composite plates using modalkinetic energy

Journal Article

An efficient two-stage approach for structural damage detection using meta-heuristic algorithms and group method of data handling surrogate model

Hamed FATHNEJAT, Behrouz AHMADI-NEDUSHAN

Journal Article

Multiple damage detection in complex bridges based on strain energy extracted from single point measurement

Alireza ARABHA NAJAFABADI, Farhad DANESHJOO, Hamid Reza AHMADI

Journal Article

Stress-strain relationship of recycled self-compacting concrete filled steel tubular column subjected

Feng YU, Cheng QIN, Shilong WANG, Junjie JIANG, Yuan FANG

Journal Article

Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

Rwayda Kh. S. AL-HAMD, Martin GILLIE, Safaa Adnan MOHAMAD, Lee S. CUNNINGHAM

Journal Article

Damage detection in beam-like structures using static shear energy redistribution

Journal Article

Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine

Pengxing YI,Peng HUANG,Tielin SHI

Journal Article

Heating energy performance and part load ratio characteristics of boiler staging in an office building

Da Young LEE, Byeong Mo SEO, Yeo Beom YOON, Sung Hyup HONG, Jong Min CHOI, Kwang Ho LEE

Journal Article

Early-life famine exposure, adulthood obesity patterns, and risk of low-energy fracture

Journal Article

The Analysis on Output-input Ratio of Artificial Supplementary Energy in Agro-eco-engineering

Bian Yousheng,Liu Yingkun,Bian Jing

Journal Article

Experimental and computational validation of a scaled train tunnel model using modal analysis

Janice B. D’SOUZA, Sangarapillai KANAPATHIPILLAI

Journal Article

Variational mode decomposition based modal parameter identification in civil engineering

Mingjie ZHANG, Fuyou XU

Journal Article

ZnO nanorefrigerant in R152a refrigeration system for energy conservation and green environment

D. SENDIL KUMAR,R. ELANSEZHIAN

Journal Article