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Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 173-179 doi: 10.1007/s11709-009-0034-1

Abstract: bluff-body model, a comparative study was made to identify the flutter derivatives of each model by using a time-domainmethod and a frequency-domain method.method and time-domain method, respectively, agree very well.More precisely, the frequency-domain method usually results in smooth curves of the flutter derivativesThe formulation of time-domain method makes the identification results of flutter derivatives relatively

Keywords： long-span bridges     wind-induced vibration     flutter derivatives     forced vibration test     time-domain method     frequency-domain method    

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Damage identification in connections of moment frames using time domain responses and an optimizationmethod

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 851-866 doi: 10.1007/s11709-021-0739-3

Abstract: In this study, an optimization-based method for joint damage identification of moment frames using thetime-domain responses is introduced.To assess the capability of the proposed method, two numerical examples via different damage scenariosThen, a comparison between the proposed method and the existing damage identification method is providedThe outcomes reveal the high efficiency of the proposed method for finding the severity and location

Keywords： damage identification     beam-to-column connection     time-domain response     optimization    

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Terahertz time-domain spectroscopy of high-pressure flames

Jason BASSI, Mark STRINGER, Bob MILES, Yang ZHANG

Frontiers in Energy 2009, Volume 3, Issue 2,   Pages 123-133 doi: 10.1007/s11708-009-0033-x

Abstract: Laser spectroscopy in the visible and near infrared is widely used as a diagnostic tool for combustion devices, but this approach is difficult at high pressures within a sooty flame itself. High soot concentrations render flames opaque to visible light, but they remain transparent to far-infrared or terahertz (THz) radiation. The first far-infrared absorption spectra, to the best of our knowledge, of sooty, non-premixed, ethylene high-pressure flames covering the region of 0.2-2.5 THz is presented. A specially designed high-pressure burner which is optically accessible to THz radiation has been built allowing flame transmission measurements up to pressures of 1.6 MPa. Calculations of the theoretical combustion species absorption spectra in the 0.2-3 THz range have shown that almost all the observable features arise from H O. A few OH (1.84 and 2.51 THz), CH (2.58 THz), and NH (1.77 and 2.95 THz) absorption lines are also observable in principle. A large number of H O absorption lines are observed in the ground vibrational in a laminar non-premixed, sooty flame (ethylene) at pressures up to 1.6 MPa.

Keywords： terahertz time-domain spectroscopy     high-pressure flames     H2O absorption lines    

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A super-element approach for structural identification in time domain

LI Jie, ZHAO Xin

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 215-221 doi: 10.1007/s11465-006-0004-4

Abstract: For most time-domain identification methods, a complete measurement for unique identification resultsthan the number of structural degrees of freedom (DOFs) in practical applications, and thus make the time-domaindomain.The super-element model used for time domain identification is first discussed in this study.parameters can be identified using a relatively small number of transducers, and the computational time

Keywords： numerical     effective decomposing     parameterization procedure     divide-and-conquer ability     time-domain identification    

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On subsurface box-shaped lined tunnel under incident SH-wave propagation

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 948-960 doi: 10.1007/s11709-021-0740-x

Abstract: In this paper, a half-plane time-domain boundary element method is applied to obtain the seismic groundAfter encoding the method in a previously confirmed computer program, a numerical study is carried outThe responses are illustrated in the time and frequency domains as two/three-dimensional graphs.

Keywords： box-lined tunnel     half-plane BEM     surface response     SH-wave     time-domain    

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Topology optimization of piezoelectric bi-material actuators with velocity feedback control

Mariana MORETTI, Emílio C. N. SILVA

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2,   Pages 190-200 doi: 10.1007/s11465-019-0537-y

Abstract: layers, affects the structural damping of the system through the velocity state variables readings in timedomain.The dynamic response for the rectangular four-noded FE analysis is obtained by the Newmark’s time-integrationmethod, which is applied to the physical and the adjoint systems, given that the adjoint formulationA gradient-based optimization method is applied to minimize the displacement energy output measured at

Keywords： topology optimization method     bi-material piezoactuator     active velocity feedback control     time-domain transient    

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Analytical method of capsizing probability in the time domain for ships in the random beam seas

LIU Liqin, TANG Yougang, LI Hongxia

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 361-366 doi: 10.1007/s11709-007-0048-5

Abstract: The random rolling differential equation was solved in the time domain by applying the harmonic accelerationmethod and by synthetically considering the instantaneous state of ships and the narrowband wave energythe survival probabilities of ships in random seas can be predicted quantitatively by the proposed method

Keywords： different     survival probability     different significant     nonlinear differential     narrowband    

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Improved numerical method for time domain dynamic structure-foundation interaction analysis based onscaled boundary finite element method

DU Jianguo, LIN Gao

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 4,   Pages 336-342 doi: 10.1007/s11709-008-0054-2

Abstract: Based on the reduced set of base function in scaled boundary finite element method (SBFEM), an improvedtime domain numerical approach for the dynamic structure-foundation interaction analysis was proposed

Keywords： structure-foundation interface     computational efficiency     different     suitable     numerical approach    

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Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review Special Feature on Precision Measurement and Instr

Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 5,   Pages 591-607 doi: 10.1631/FITEE.1800633

Abstract:

We give a brief review of the developments in terahertz time-domain spectroscopy (THz-TDS) systems

Keywords： Terahertz (THz) time-domain spectroscopy     Micro-cavity     Metal holes array     Waveguide cavities     Spoof localized    

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framework for underground structures in layered ground under inclined P-SV waves using stiffness matrix and domain

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 10-24 doi: 10.1007/s11709-022-0904-3

Abstract: The free-field responses are first obtained using the stiffness matrix method based on plane-wave assumptionsThen, the domain reduction method was employed to reproduce the wavefield in the numerical model of the

Keywords： underground structures     seismic response     stiffness matrix method     domain reduction method     P-SV waves    

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A modified pulse charging method for lithium-ion batteries by considering stress evolution, chargingtime and capacity utilization

Yanfei ZHAO, Bo LU, Yicheng SONG, Junqian ZHANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 294-302 doi: 10.1007/s11709-018-0460-z

Abstract: The stress evolution, total charging time and capacity utilization of pulse charging (PC) method areIt is found that compared to the conventional constant current (CC) charging method, the PC method canBy introducing stress control, a modified PC method called the PCCC method, which starts with a PC operationloss occurring in the PC method.Furthermore, the optimal pulsed current density and switch time in the PCCC method is also discussed.

Keywords： fast charging method     pulse charging     stress evolution     charging time     capacity utilization    

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Real-time task processing method based on edge computing for spinning CPS

Shiyong YIN, Jinsong BAO, Jie LI, Jie ZHANG

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3,   Pages 320-331 doi: 10.1007/s11465-019-0542-1

Abstract: efficiency and yarn quality if not processed in time.This paper presents an edge computing-based method that is different from traditional centralized cloudEdge computing nodes, real-time tasks, and edge computing resources are defined.A system model is established, and a real-time task processing method is proposed for the edge computingExperimental results indicate that the proposed real-time task processing method based on edge computing

Keywords： edge computing     real-time task     scheduling     CPS     spinning    

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The smoothed finite element method (S-FEM): A framework for the design of numerical models for desired

Gui-Rong Liu

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 456-477 doi: 10.1007/s11709-019-0519-5

Abstract:

The smoothed finite element method (S-FEM) was originated by G R Liu by combining some meshfree techniqueswith the well-established standard finite element method (FEM).

Keywords： computational method     finite element method     smoothed finite element method     strain smoothing technique     smoothing domain     weakened weak form     solid mechanics     softening effect     upper bound solution    

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WEIS wheel speed real-time measuring method for VOSM

Mengyao PAN, Guixiong LIU, Xiaobin HONG, Tusheng LIN,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 3,   Pages 322-327 doi: 10.1007/s11465-010-0022-0

Abstract: in traditional wheel speed measuring methods, such as low measurement precision and the lack of real-timevehicle’s operating attitude, a wheel embedded intelligent sensors (WEIS) wheel speed measuring methodpacket to implement wavelet de-noising for the non-stationary acceleration signals, and adopting short-timeexperimental conditions the speed measurement error is −2.05%, and the speed measuring response time

Keywords： wheel embedded     intelligent sensing     wheel speed     monitoring    

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Multi-objective optimization in a finite time thermodynamic method for dish-Stirling by branch and boundmethod and MOPSO algorithm

Mohammad Reza NAZEMZADEGAN, Alibakhsh KASAEIAN, Somayeh TOGHYANI, Mohammad Hossein AHMADI, R. SAIDUR, Tingzhen MING

Frontiers in Energy 2020, Volume 14, Issue 3,   Pages 649-665 doi: 10.1007/s11708-018-0548-0

Abstract: One of those analyses is the finite time thermodynamic analysis by which the total power of the systemcan be obtained by calculating the process time.The comparison of the results shows the benefits of MOPSO in optimizing dish Stirling finite time thermodynamic

Keywords： dish-Stirling     finite time model     branch and bound algorithm     multi-objective particle swarm optimization    

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Title Author Date Type Operation

Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Journal Article

Damage identification in connections of moment frames using time domain responses and an optimizationmethod

Journal Article

Terahertz time-domain spectroscopy of high-pressure flames

Jason BASSI, Mark STRINGER, Bob MILES, Yang ZHANG

Journal Article

A super-element approach for structural identification in time domain

LI Jie, ZHAO Xin

Journal Article

On subsurface box-shaped lined tunnel under incident SH-wave propagation

Journal Article

Topology optimization of piezoelectric bi-material actuators with velocity feedback control

Mariana MORETTI, Emílio C. N. SILVA

Journal Article

Analytical method of capsizing probability in the time domain for ships in the random beam seas

LIU Liqin, TANG Yougang, LI Hongxia

Journal Article

Improved numerical method for time domain dynamic structure-foundation interaction analysis based onscaled boundary finite element method

DU Jianguo, LIN Gao

Journal Article

Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review

Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG

Journal Article

framework for underground structures in layered ground under inclined P-SV waves using stiffness matrix and domain

Journal Article

A modified pulse charging method for lithium-ion batteries by considering stress evolution, chargingtime and capacity utilization

Yanfei ZHAO, Bo LU, Yicheng SONG, Junqian ZHANG

Journal Article

Real-time task processing method based on edge computing for spinning CPS

Shiyong YIN, Jinsong BAO, Jie LI, Jie ZHANG

Journal Article

The smoothed finite element method (S-FEM): A framework for the design of numerical models for desired

Gui-Rong Liu

Journal Article

WEIS wheel speed real-time measuring method for VOSM

Mengyao PAN, Guixiong LIU, Xiaobin HONG, Tusheng LIN,

Journal Article

Multi-objective optimization in a finite time thermodynamic method for dish-Stirling by branch and boundmethod and MOPSO algorithm

Mohammad Reza NAZEMZADEGAN, Alibakhsh KASAEIAN, Somayeh TOGHYANI, Mohammad Hossein AHMADI, R. SAIDUR, Tingzhen MING

Journal Article