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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: method and a frequency-domain method.It was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domainmethod 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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Frequency domain a9ctive vibration control of a flexible plate based on neural networks

Jinxin LIU, Xuefeng CHEN, Zhengjia HE

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2, Pages 109-117 doi: 10.1007/s11465-013-0252-z

Abstract:

A neural-network (NN)-based active control system was proposed to reduce the low frequency noise radiationMulti-frequency control in frequency domain was achieved by simulation through the NN-based control systems

Keywords： active vibration control (AVC) neural network (NN) low frequency noise frequency domain control multi-frequency

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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: floor isolation from the ground motions are filtered by the structure, leaving the majority of the frequencycontent of the input motion lower than the predominant frequency of the structure.effectively reduced acceleration for short period motions with frequencies close to the predominant frequencywell as effectively reduced displacement for long period motions with frequencies close to the natural frequencypassive control because of its capacity to adjust control strategies according to the different motion frequency

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

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MIMO-GPC Stability Analysis Based on Frequency Domain

Sun Qinglin,Chen Zengqiang,Yuan Zhuzhi

Strategic Study of CAE 2004, Volume 6, Issue 10, Pages 39-44

Abstract:

A MIMO-GPC stability theorem based on frequency domain is presented in the paper.

Keywords： MIMO-GPC frequency domain analysis stability criterion

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Frequency-domain-based Robustness Analysis for PID Generalized Predictive Control

Wang Fanzhen,Chen Zengqiang,Yao Xiangfeng,Yuan Zhuzhi

Strategic Study of CAE 2006, Volume 8, Issue 10, Pages 66-70

Abstract: Further more, the influence of PID - GPC parameter tuning on its robustness is analyzed in frequencydomain.

Keywords： predictive control robustness frequency domain small-gain criterion PID control

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Anti-collision monitoring based on detecting casing head vibration induced by drill movements

He Baosheng,Liu Gang,Wang Shuangping,Wen Min

Strategic Study of CAE 2011, Volume 13, Issue 5, Pages 74-78

Abstract: The acceleration sensors were fixed on the casing head to fell the vibration, the time domain analysisand frequency domain analysis were used in signal processing to recognize the approach motive of the

Keywords： encryption adjustment well anti-collision risk well vibration signal time domain analysis frequencydomain analysis

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Frequency-Domain Full-Waveform Inversion Based on Tunnel Space Seismic Data Article

Mingyu Yu,Fei Cheng,Jiangping Liu,Daicheng Peng,Zhijian Tian

Engineering 2022, Volume 18, Issue 11, Pages 197-206 doi: 10.1016/j.eng.2021.06.018

Abstract: Thus, we apply a frequency-domain acoustic full-waveform inversion (FWI) method to obtain high-resolutionWe discuss the influence of the frequency group selection strategy and the tunnel observation systemBased on the conventional strategies of frequency-domain acoustic FWI, we propose a frequency group selectionstrategy that combines a low-frequency selection covering the vertical wavenumber and a high-frequency

Keywords： Tunnel seismic detection Full-waveform inversion Frequency select strategy Observation system

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An efficient stochastic dynamic analysis of soil media using radial basis function artificial neural network

P. ZAKIAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 4, Pages 470-479 doi: 10.1007/s11709-017-0440-8

Abstract: this study, the stochastic dynamic analysis of soil mass is performed by finite element method in the frequencydomain.

Keywords： stochastic analysis random seismic excitation finite element method artificial neural network frequencydomain analysis Monte Carlo simulation

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Entity and relation extraction with rule-guided dictionary as domain knowledge

Frontiers of Engineering Management Pages 610-622 doi: 10.1007/s42524-022-0226-0

Abstract: Entity and relation extraction is an indispensable part of domain knowledge graph construction, whichcan serve relevant knowledge needs in a specific domain, such as providing support for product research, sales, risk control, and domain hotspot analysis.However, the performance of these methods degrades when they face domain-specific datasets.To address the problems above, this paper first introduced prior knowledge composed of domain dictionaries

Keywords： entity extraction relation extraction prior knowledge domain rule

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

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

Abstract: study, an optimization-based method for joint damage identification of moment frames using the time-domain

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

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Fatigue Life Prediction of Long-Life Pavement Using Frequency-Domain Analysis

Wei Baoli,Guo Chengchao and Cui Can

Strategic Study of CAE 2017, Volume 19, Issue 6, Pages 80-85 doi: 10.15302/J-SSCAE-2017.06.012

Abstract: A detailed frequency domain analysis of fatigue life was carried out.

Keywords： long-life pavement fatigue life prediction random vibration power spectral density

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Frequency-domain Analysis of ECG Signals

Tu Chengyuan,Zeng Yanjun,Li Shuxin

Strategic Study of CAE 2002, Volume 4, Issue 12, Pages 66-70

Abstract:

A new simple approach to effectively detect QRS — T complexes in ECG curve is described, so as to easily get the P-wave (when AF does not happen) or the f-wave (when AF happens). By means of signal processing techniques such as the power spectrum function, the auto-correlation function and cross-correlation function, two kinds of ECG signals when AF does or does not happen were successively analyzed, showing the evident differences between them.

Keywords： ECG curve P-wave f-wave AF (atrial fibrillation) histogram power spectrum autocorrelation cross-correlation

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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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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: Then, 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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Dynamic parameterized learning for unsupervised domain adaptation Research Article

Runhua JIANG, Yahong HAN

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 11, Pages 1616-1632 doi: 10.1631/FITEE.2200631

Abstract: enables neural networks to transfer from a labeled source domain to an unlabeled target domain by learningdomain-invariant representations.First, by exploring domain-level semantic knowledge, the dynamic alignment parameter is proposed, toBesides, for obtaining semantic-discriminative and domain-invariant representations, we propose to align

Keywords： Unsupervised domain adaptation Optimization steps Domain alignment Semantic discrimination