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A dynamic stiffness-based framework for harmonic input estimation and response reconstruction considering damage

Yixian LI; Limin SUN; Wang ZHU; Wei ZHANG

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 4,   Pages 448-460 doi: 10.1007/s11709-022-0805-5

Abstract: To begin, Fourier transform converts the dynamic equilibrium equation to an equivalent static one inthe frequency domain, which is under-determined since the dimension of measurement vector is far lessThe principal component analysis has been adopted to “compress” the under-determined equation, and formedan over-determined equation to estimate the unknown input.

Keywords： dynamic stiffness     principal component analysis     response reconstruction     damage localization     under-determinedequation    

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Non-convex sparse optimization-based impact force identification with limited vibration measurements

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 3, doi: 10.1007/s11465-023-0762-2

Abstract: When solving the under-determined problem, Keywords： impact force identification     inverse problem     sparse regularization     under-determined condition     alternating    

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Data recovery with sub-Nyquist sampling: fundamental limit and a detection algorithm

Xiqian Luo, Zhaoyang Zhang,ning_ming@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 2,   Pages 141-286 doi: 10.1631/FITEE.1900320

Abstract: no information loss, the sub-Nyquist rate may also be sufficient for sampling and recovering signals under

Keywords： Nyquist-Shannon sampling theorem     Sub-Nyquist sampling     Minimum Euclidean distance     Under-determined    

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Parametric equations for notch stress concentration factors of rib–deck welds under bending loading

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 595-608 doi: 10.1007/s11709-021-0720-1

Abstract: The effective notch stress approach for evaluating the fatigue strength of rib–deck welds requires notch stress concentration factors obtained from complex finite element analysis. To improve the efficiency of the approach, the notch stress concentration factors for three typical fatigue-cracking modes (i.e., root–toe, root–deck, and toe–deck cracking modes) were thoroughly investigated in this study. First, we developed a model for investigating the effective notch stress in rib–deck welds. Then, we performed a parametric analysis to investigate the effects of multiple geometric parameters of a rib–deck weld on the notch stress concentration factors. On this basis, the multiple linear stepwise regression analysis was performed to obtain the optimal regression functions for predicting the notch stress concentration factors. Finally, we employed the proposed formulas in a case study. The notch stress concentration factors estimated from the developed formulas show agree well with the finite element analysis results. The results of the case study demonstrate the feasibility and reliability of the proposed formulas. It also shows that the fatigue design curve of FAT225 seems to be conservative for evaluating the fatigue strength of rib–deck welds.

Keywords： notch stress concentration factor     rib–deck weld     parametric analysis     regression analysis     parametric equation    

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Simplified theoretical analysis and numerical study on the dynamic behavior of FCP under blast loads

Chunfeng ZHAO, Xin YE, Avinash GAUTAM, Xin LU, Y. L. MO

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 983-997 doi: 10.1007/s11709-020-0633-4

Abstract: nonlinear 3D model are developed and established to assess the dynamic behavior of precast concrete slabs underFinally, a simplified theoretical model of the FCP under blast load is developed to predict the maximumIt is indicated that the theoretical model can precisely predict the maximum displacement of FCP under

Keywords： precast structure     fabricated concrete panel     blast resistance     theory model     empirical equation    

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Sufficient or insufficient: Assessment of the intended nationally determined contributions (INDCs) of

Ge GAO, Mo CHEN, Jiayu WANG, Kexin YANG, Yujiao XIAN, Xunpeng SHI, Ke WANG

Frontiers of Engineering Management 2019, Volume 6, Issue 1,   Pages 19-37 doi: 10.1007/s42524-019-0007-6

Abstract: Nations Framework Convention on Climate Change has resulted in the submission of the Intended Nationally Determined

Keywords： Intended Nationally Determined Contributions     mitigation     responsibility     capacity     potential    

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Influence of site conditions on seismic design parameters for foundations as determined via nonlinear

Muhammad Tariq A. CHAUDHARY

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 275-303 doi: 10.1007/s11709-021-0685-0

Abstract: Site conditions, including geotechnical properties and the geological setting, influence the near-surface response of strata subjected to seismic excitation. The geotechnical parameters required for the design of foundations include mass density ( ), damping ratio ( ), shear wave velocity ( ), and soil shear modulus ( ). The values of the last three parameters are sensitive to the level of nonlinear strain induced in the strata due to seismic ground motion. In this study, the effect of variations in soil properties, such as plasticity index ( ), effective stress ( ), over consolidation ratio (OCR), impedance contrast ratio ( ) between the bedrock and the overlying strata, and depth of soil strata over bedrock ( ), on seismic design parameters ( , , and ) was investigated for National Earthquake Hazards Reduction Program (NEHRP) site classes C and D, through 1D nonlinear seismic site response analysis. The Morris one-at-a-time (OAT) sensitivity analysis indicated that , , and were significantly influenced by variations in , while affected more than it affected and . However, the influence of on these parameters was less significant. It was also found that variations in soil properties influenced seismic design parameters in soil type D more significantly than in soil type C. Predictive relationships for , , and were derived based on the 1D seismic site response analysis and sensitivity analysis results. The , , and values obtained from the analysis were compared with the corresponding values in NEHRP to determine the similarities and differences between the two sets of values. The need to incorporate and in the metrics for determining , , and for the seismic design of foundations was highlighted.

Keywords： site effects     1D seismic site response analysis     sensitivity analysis     foundations     shear wave velocity     soil shear modulus    

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China’s pre-2020 CO

Hailin WANG

Frontiers in Energy 2019, Volume 13, Issue 3,   Pages 571-578 doi: 10.1007/s11708-019-0640-0

Abstract: and simulates the decrease of CO intensity of GDP in 2020 and its influences on achieving National Determined

Keywords： China’s National Determined Contribution     emission reduction potential     scenario analysis     CO2   

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Comparison of the performance of traditional advection-dispersion equation and mobile-immobile model

Haizhu HU,Xiaomin MAO

Frontiers of Agricultural Science and Engineering 2016, Volume 3, Issue 3,   Pages 241-248 doi: 10.15302/J-FASE-2016108

Abstract: The traditional advection-dispersion equation (ADE) and the mobile-immobile model (MIM) are widely usedtransport of conservative, adsorbing and degradable solutes through a 1 m heterogeneous soil column under

Keywords： solute transport     advection dispersion equation (ADE)     mobile-immobile model (MIM)     conservative solute    

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Optimal design of extractive dividing-wall column using an efficient equation-oriented approach

Yingjie Ma, Nan Zhang, Jie Li, Cuiwen Cao

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 1,   Pages 72-89 doi: 10.1007/s11705-020-1977-y

Abstract: relaxed tolerance for the simulation in the sensitivity analysis mode when the simulation diverges under

Keywords： design     extractive dividing-wall column     equation-oriented optimisation     pseudo-transient continuation model    

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Situation and measures of China’s CO

Jiankun HE

Frontiers in Energy 2018, Volume 12, Issue 3,   Pages 353-361 doi: 10.1007/s11708-018-0564-0

Abstract: Currently, under the new economic normal, China further strengthens the policy measure, vigorously saves

Keywords： climate change     the Paris Agreement     energy revolution     NDC (national determined contribution) goals    

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Calculation and research on deepwater drilling riser flexural equation and natural frequency

Jiang Wei

Strategic Study of CAE 2011, Volume 13, Issue 5,   Pages 66-73

Abstract:

Flexural equation was established in this paper, which was based on applicationFree-hinged beam was taken as constraint condition of flexural equation combined with drilling string

Keywords： deepwater drilling     drilling riser     flexural equation     natural frequency     shape function    

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Feature extraction from slice data for reverse engineering

ZHANG Yingjie, LU Shangning

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 25-31 doi: 10.1007/s11465-007-0004-z

Abstract: The curve fitting methods are applied for each curve segment to remove the unwanted points with pre-determined

Keywords： feasibility     corresponding     B-spline     pre-determined tolerance     extraction    

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Parametric analysis and design equation of ultimate capacity for unstiffened overlapped CHS K-joints

CHEN Yu, ZHAO Xianzhong, CHEN Yiyi

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 2,   Pages 107-115 doi: 10.1007/s11709-008-0014-x

Abstract: Finally, based on the design equation of gap joints, a formula predicting the ultimate capacity of overlappedResults from the proposed design equation are consistent with experimental results.

Keywords： regression analysis     consistent     unstiffened     plasticity     overlapped    

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Personal Viewpoint on the Self-determined Innovation of Modern Science and Technology in Relationship

Li Shihui

Strategic Study of CAE 2005, Volume 7, Issue 4,   Pages 11-21

Abstract: and Western culture each other, this paper briefly studies some typical examples about original self-determineddemonstrate with practical examples that the traditional Chinese culture plays a great role on the self-determined

Keywords： Chinese traditional culture     Western culture     complement each other     self-determined innovation of science    

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Title Author Date Type Operation

A dynamic stiffness-based framework for harmonic input estimation and response reconstruction considering damage

Yixian LI; Limin SUN; Wang ZHU; Wei ZHANG

Journal Article

Non-convex sparse optimization-based impact force identification with limited vibration measurements

Journal Article

Data recovery with sub-Nyquist sampling: fundamental limit and a detection algorithm

Xiqian Luo, Zhaoyang Zhang,ning_ming@zju.edu.cn

Journal Article

Parametric equations for notch stress concentration factors of rib–deck welds under bending loading

Journal Article

Simplified theoretical analysis and numerical study on the dynamic behavior of FCP under blast loads

Chunfeng ZHAO, Xin YE, Avinash GAUTAM, Xin LU, Y. L. MO

Journal Article

Sufficient or insufficient: Assessment of the intended nationally determined contributions (INDCs) of

Ge GAO, Mo CHEN, Jiayu WANG, Kexin YANG, Yujiao XIAN, Xunpeng SHI, Ke WANG

Journal Article

Influence of site conditions on seismic design parameters for foundations as determined via nonlinear

Muhammad Tariq A. CHAUDHARY

Journal Article

China’s pre-2020 CO

Hailin WANG

Journal Article

Comparison of the performance of traditional advection-dispersion equation and mobile-immobile model

Haizhu HU,Xiaomin MAO

Journal Article

Optimal design of extractive dividing-wall column using an efficient equation-oriented approach

Yingjie Ma, Nan Zhang, Jie Li, Cuiwen Cao

Journal Article

Situation and measures of China’s CO

Jiankun HE

Journal Article

Calculation and research on deepwater drilling riser flexural equation and natural frequency

Jiang Wei

Journal Article

Feature extraction from slice data for reverse engineering

ZHANG Yingjie, LU Shangning

Journal Article

Parametric analysis and design equation of ultimate capacity for unstiffened overlapped CHS K-joints

CHEN Yu, ZHAO Xianzhong, CHEN Yiyi

Journal Article

Personal Viewpoint on the Self-determined Innovation of Modern Science and Technology in Relationship

Li Shihui

Journal Article