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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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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: converts the dynamic equilibrium equation to an equivalent static one in the frequency domain, which is under-determinedThe 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-determined    

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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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Benzene removal by nano magnetic particles under continuous condition from aqueous solutions

Amin Mohammad Mehdi,Bina Bijan,Majd Amir Masoud Samani,Pourzamani Hamidreza

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 3,   Pages 345-356 doi: 10.1007/s11783-013-0574-4

Abstract: removal from aqueous solutions was evaluated using Fe O nano magnetic particles (NM) in continuous conditionThe results indicated that all factors were significant and the optimum condition was: pH 8, NM doseThe nano particles were shown to capture 98.7% of the benzene in optimum batch condition and 94.5% incontinuous condition.

Keywords： benzene     experimental design     Fe3O4     continues condition     thermal recycling    

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Overview of condition monitoring and operation control of electric power conversion systems in direct-drivewind turbines under faults

Shoudao HUANG, Xuan WU, Xiao LIU, Jian GAO, Yunze HE

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 281-302 doi: 10.1007/s11465-017-0442-1

Abstract: of EPCSs and reduce the operation and maintenance cost of DD-WTs, numerous researchers have studied conditionThis paper provides an overview of the CM, FD, and operation control of EPCSs in DD-WTs under faults.; briefly reviewed CM and FD methods and operation control of these generators and power converters under

Keywords： direct-drive wind turbine     electric power conversion system     condition monitoring     fault diagnosis     operationcontrol under faults     fault tolerance    

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Simulation of flow excursion and thermal siphon under natural circulation condition with lower pressure

WANG Jianjun, YANG Xingtuan, JIANG Shengyao

Frontiers in Energy 2008, Volume 2, Issue 2,   Pages 169-173 doi: 10.1007/s11708-008-0044-z

Abstract: The simulation of flow excursion was conducted under HRTL-5 condition.

Keywords： HRTL-5     experiment     circulation     simulation     thermal    

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Study of two-phase flow regime identification in horizontal tube bundles under vertical upward cross-flowcondition using wavelet transform

HUANG Xinghua, WANG Li, JIA Feng

Frontiers in Energy 2008, Volume 2, Issue 3,   Pages 333-338 doi: 10.1007/s11708-008-0043-0

Abstract: A wavelet-transform based approach for flow regime identification in horizontal tube bundles under verticalupward cross-flow condition was presented.Tests on two-phase flow pattern of R134a were conducted under low mass velocity and flow boiling conditionsthe discrete wavelet transform as the tool of flow regime identification in horizontal tube bundles undervertical upward cross-flow condition.

Keywords： two-phase     discrete     appropriate     wavelet-transform     criterion    

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Optimization of urban bus operation frequency under common route condition with rail transit

Bin YU, Sijia REN, Enze WU, Yifan ZHOU, Yunpeng WANG

Frontiers of Engineering Management 2017, Volume 4, Issue 4,   Pages 451-462 doi: 10.15302/J-FEM-2017036

Abstract: rail transits are becoming increasingly common, this paper aims to present the overlapped operation condition

Keywords： common route     bus operation frequency     bi-level model     Agent simulation     SCE-UA algorithm    

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Chemical reactions of oily sludge catalyzed by iron oxide under supercritical water gasification condition

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6,   Pages 886-896 doi: 10.1007/s11705-021-2125-z

Abstract: The heteroatom O was removed under the effects of supercritical water.

Keywords： oily sludge     SCWG     ReaxFF     Fe2O3     heteroatoms    

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Multi-Component Resource Recycling from Waste Light-Emitting Diode Under Hydrothermal Condition: Plastic

Yongliang Zhang,Lu Zhan,Zhenming Xu,

Engineering doi: 10.1016/j.eng.2023.04.008

Abstract: Light emitting diodes (LEDs) have accounted for most of the lighting market as the technology matures and costs continue to reduce. As a new type of e-waste, LED is a double-edged sword, as it contains not only precious and rare metals but also organic packaging materials. In previous studies, LED recycling focused on recovering precious and strategic metals while ignoring harmful substances such as organic packaging materials. Unlike crushing and other traditional methods, hydrothermal treatment can provide an environment-friendly process for decomposing packaging materials. This work developed a closed reaction vessel, where the degradation rate of plastic polyphthalamide (PPA) was close to 100%, with nano-TiO2 encapsulated in plastic PPA being efficiently recovered, while metals contained in LED were also recycled efficiently. Besides, the role of water in plastic PPA degradation that has been overlooked in current studies was explored and speculated in detail in this work. Environmental impact assessment revealed that the proposed recycling route for waste LED could significantly reduce the overall environmental impact compared to the currently published processes. Especially the developed method could reduce more than half the impact of global warming. Furthermore, this research provides a theoretical basis and a promising method for recycling other plastic-packaged e-waste devices, such as integrated circuits.

Keywords： Waste LED     Hydrothermal treatment     Recycling     Plastic PPA degradation     Packaging materials    

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Frost heave and freezing processes of saturated rock with an open crack under different freezing conditions

Zhitao LV, Caichu XIA, Yuesong WANG, Ziliang LIN

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 947-960 doi: 10.1007/s11709-020-0638-z

Abstract: Frost heave of crack in sandstone with high permeability is more significant under uniform freezing conditionthan that under unidirectional freezing condition.freezing condition.uniform freezing condition.rock because water migration is blocked under unidirectional freezing condition.

Keywords： frost heave     rock with crack     freezing process     freezing condition     frost heave mode    

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Simulation of performance of intermediate fluid vaporizer under wide operation conditions

Bojie WANG, Wen WANG, Chao QI, Yiwu KUANG, Jiawei XU

Frontiers in Energy 2020, Volume 14, Issue 3,   Pages 452-462 doi: 10.1007/s11708-020-0681-4

Abstract: In the rated condition, it is suggested to reduce tube diameters appropriately to get a large total heat

Keywords： liquefied natural gas     intermediate fluid vapo-rizer     heat transfer performance     numerical simulation     extreme condition    

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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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A review of condition-based maintenance: Its prognostic and operational aspects

Yanrong LI, Shizhe PENG, Yanting LI, Wei JIANG

Frontiers of Engineering Management 2020, Volume 7, Issue 3,   Pages 323-334 doi: 10.1007/s42524-020-0121-5

Abstract: Condition-based maintenance (CBM) detects early signs of failure and dictates when maintenance shouldbe performed based on the actual condition of a system.In this paper, we first review some of the recent research on CBM under various physical structures and

Keywords： condition-based maintenance     prognostics     operational decision-making     reliability    

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Title Author Date Type Operation

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

Journal Article

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

Yixian LI; Limin SUN; Wang ZHU; Wei ZHANG

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

Benzene removal by nano magnetic particles under continuous condition from aqueous solutions

Amin Mohammad Mehdi,Bina Bijan,Majd Amir Masoud Samani,Pourzamani Hamidreza

Journal Article

Overview of condition monitoring and operation control of electric power conversion systems in direct-drivewind turbines under faults

Shoudao HUANG, Xuan WU, Xiao LIU, Jian GAO, Yunze HE

Journal Article

Simulation of flow excursion and thermal siphon under natural circulation condition with lower pressure

WANG Jianjun, YANG Xingtuan, JIANG Shengyao

Journal Article

Study of two-phase flow regime identification in horizontal tube bundles under vertical upward cross-flowcondition using wavelet transform

HUANG Xinghua, WANG Li, JIA Feng

Journal Article

Optimization of urban bus operation frequency under common route condition with rail transit

Bin YU, Sijia REN, Enze WU, Yifan ZHOU, Yunpeng WANG

Journal Article

Chemical reactions of oily sludge catalyzed by iron oxide under supercritical water gasification condition

Journal Article

Multi-Component Resource Recycling from Waste Light-Emitting Diode Under Hydrothermal Condition: Plastic

Yongliang Zhang,Lu Zhan,Zhenming Xu,

Journal Article

Frost heave and freezing processes of saturated rock with an open crack under different freezing conditions

Zhitao LV, Caichu XIA, Yuesong WANG, Ziliang LIN

Journal Article

Simulation of performance of intermediate fluid vaporizer under wide operation conditions

Bojie WANG, Wen WANG, Chao QI, Yiwu KUANG, Jiawei XU

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

A review of condition-based maintenance: Its prognostic and operational aspects

Yanrong LI, Shizhe PENG, Yanting LI, Wei JIANG

Journal Article