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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: comparative study was made to identify the flutter derivatives of each model by using a time-domain methodand 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 derivatives

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

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Oscillation frequency of simplified arterial tubes

Hui AN, Fan HE, Lingxia XING, Xiaoyang LI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 300-304 doi: 10.1007/s11465-009-0038-5

Abstract: To construct the spatial kinetic equation of an arterial tube and obtain its radial natural frequencyThe theoretical analysis is first presented and the finite element method is then used to numericallyThe results show that the first-order frequency is 15.8 Hz and the obtained exact analytical solutions

Keywords： spatial kinematics     natural frequency     finite element method    

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Dynamics of structural systems with various frequency-dependent damping models

Li LI,Yujin HU,Weiming DENG,Lei LÜ,Zhe DING

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 1,   Pages 48-63 doi: 10.1007/s11465-015-0330-5

Abstract: The assumed frequency-dependent damping forces depend on the past history of motion via convolution integralsBy choosing suitable damping kernel functions of frequency-dependent damping model, it may be derivedBoth the mode superposition method and Fourier transform method are developed for calculating the dynamicconditions into an equivalent one with zero initial conditions and therefore present a Fourier transform method

Keywords： damping     viscoelasticity     dynamic analysis     mode superposition method     Fourier transform method    

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A novel period estimation method for X-ray pulsars based on frequency subdivision

Li-rong SHEN,Xiao-ping LI,Hai-feng SUN,Hai-yan FANG,Meng-fan XUE

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 10,   Pages 858-870 doi: 10.1631/FITEE.1500052

Abstract: Longer observation time or oversampling can be employed to improve frequency analysis results, but withTo resolve this issue, a new method based on frequency subdivision and the continuous Lomb periodogramIn the proposed method, an initial frequency is first calculated using fast Lomb periodogram.Then frequency subdivision is performed near the initial frequency to obtain frequencies with higherFurthermore, the proposed method performs better than efsearch (a period estimation method of HEAsoft

Keywords： Pulsar navigation     Period estimation     Frequency subdivision     Continuous Lomb periodogram    

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Research on Prony’s method modeling in multi-target detection of stepped-frequency radar

Hu Tiling,Li Xingguo

Strategic Study of CAE 2008, Volume 10, Issue 10,   Pages 67-71

Abstract:

Stepped-frequency signal is a broad band signal which enhances rangeBaseband signal that is received in stepped-frequency radar can be thought of as the linear combinationExtended Prony algorithm is applied to stepped-frequency radar, which can obtain more exact target informationCorresponding modeling analysis and experiment simulation explain the advantages of Prony's method

Keywords： high resolution radar     stepped-frequency signal     extended Prony’s method     multi-scattering center    

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Research on fuzzy neural network control method for high-frequency vacuum drying of wood

Jiang Bin,Sun Liping,Cao Jun and Zhou Zheng

Strategic Study of CAE 2014, Volume 16, Issue 4,   Pages 17-20

Abstract:

High- frequency vacuum combined wood drying is a kind of fast dryingOn the basis of theoretical analysis with high frequency in wood vacuum drying process，the fuzzy controllerand fuzzy neural network controller of wood drying are designed in view of the neural network methodThe method to realize the automatic control of timber drying process has important research significance

Keywords： high-frequency vacuum     wood drying     fuzzy neural network    

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Research of mid and high frequency response of complex mechanical structures using energy finite elementmethod

Zhu Danhui,Xie Miaoxia,Kong Xiangjie,Zhang Wenbo,Chen Hualing

Strategic Study of CAE 2013, Volume 15, Issue 1,   Pages 106-112

Abstract: theory and applications of EFEM are reviewed, which indicate that the development direction of this methodmulti-waves considered, such as the cylindrical shell and truncated conical shell, and this methodhelp us to obtain the local detail response of complex structures in mid and high frequency range; 

Keywords： mid and high frequency response     energy finite element method     prediction of vibro-acoustical response    

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Research on acoustic-structure sensitivity using FEM and BEM

ZHANG Jun, ZHAO Wenzhong, ZHANG Weiying

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 62-67 doi: 10.1007/s11465-007-0010-1

Abstract: Using FEM (finite element method) and BEM (boundary element method) acoustic-structure sensitivity wasThis method was applied to an empty box as an example.Acoustic pressure sensitivity with respect to structure thickness achieved in frequency ranges 1 100Hz, and its change rule along with stimulating frequency and design variable were analyzed.Results show that acoustic-structure sensitivity method linked with FEM and BEM is effective and correct

Keywords： sensitivity method     BEM     acoustic pressure     pressure sensitivity     frequency    

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Soil seismic analysis for 2D oblique incident waves using exact free-field responses by frequency-basedfinite/infinite element method

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 12,   Pages 1530-1551 doi: 10.1007/s11709-022-0900-7

Abstract: half-space under two-dimensional (2D) oblique incident waves is carried out by the finite/infinite element methodFirst, the frequency-domain exact solutions for the displacements and stresses of the free field areBased on the asymmetric finite/infinite element model, the frequency-domain motion equations for seismicThe results obtained in frequency and time domain are verified against those of Wolf’s, Luco and de Barros

Keywords： oblique incident waves     critical angle     half-space     finite/infinite element approach     seismic response analysis    

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Solving nonlinear differential equations of Vanderpol, Rayleigh and Duffing by AGM

M. R. AKBARI,D. D. GANJI,A. MAJIDIAN,A. R. AHMADI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 2,   Pages 177-190 doi: 10.1007/s11465-014-0288-8

Abstract: are Vanderpol, Rayleigh and Duffing equations, have been analyzed and solved completely by Algebraic MethodThis issue will be emerged after comparing the achieved solutions by numerical method (Runge-Kutte 4thBased on the comparisons which have been made between the gained solutions by AGM and numerical methodThe results reveal that this method is not only very effective and simple, but also reliable, and can

Keywords： Algebraic Method (AGM)     Angular Frequency     Vanderpol     Rayleigh     Duffing    

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Study on tension testing of short hangers in suspension bridges

Qi Dongchun,Guo Jian,Shen Ruili

Strategic Study of CAE 2010, Volume 12, Issue 7,   Pages 78-83

Abstract: The results show that the simplifying assumptions of formula method are not suitable for short hangersHanger tension calculation with finite element method is introduced.bending stiffness of hangers is identified; then corresponding relationship table of hanger tension-frequencyThe corresponding tension of a measured frequency can be obtained through looking up the table.method.

Keywords： short hanger     hanger tension measurement     frequency method     bending rigidity     finite element method    

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Identification of dynamic stiffness matrix of bearing joint region

Feng HU, Bo WU, Youmin HU, Tielin SHI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 289-299 doi: 10.1007/s11465-009-0064-3

Abstract: The paper proposes an identification method of the dynamic stiffness matrix of a bearing joint regionauthor deduces an identification model of the dynamic stiffness matrix from the synthetic substructure methodThe dynamic stiffness matrix of the bearing joint region can be identified by measuring the matrix of frequency

Keywords： frequency response function (FRFs)     dynamic stiffness     finite element     synthetic substructure method     joint    

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A frequency error estimation for isogeometric analysis of Kirchhoff–Love cylindrical shells

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0006-x

Abstract: A frequency error estimation is presented for the isogeometric free vibration analysis of Kirchhoff–LoveBy analyzing the discrete isogeometric equations with the aid of harmonic wave assumption, the frequencyIn particular, the governing relationship of the continuum frequency for Kirchhoff–Love cylindrical shellsis naturally embedded into the frequency error measures without the need of explicit frequency expressionsNumerical results not only thoroughly verify the theoretical convergence rates of frequency solutions

Keywords： isogeometric analysis     Kirchhoff–Love cylindrical shell     free vibration     frequency error     convergence    

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A Cell Condition-Sensitive Frequency Segmentation Method Based on the Sub-Band Instantaneous Energy Spectrum Article

Zhaohui Zeng, Weihua Gui, Xiaofang Chen, Yongfang Xie, Hongliang Zhang, Yubo Sun

Engineering 2021, Volume 7, Issue 9,   Pages 1282-1292 doi: 10.1016/j.eng.2020.11.012

Abstract: Ultimately, a cell condition-sensitive frequency segmentation method is given.The proposed frequency segmentation method divides the effective frequency band into the [0, 0.001] Hzband of low-frequency signals and the [0.001, 0.050] Hz band of low-frequency noise, and subdividesband within the effective frequency band of the cell voltage.The proposed frequency segmentation method is more sensitive to cell condition changes and can obtain

Keywords： Sub-band instantaneous energy spectrum     Cell condition-sensitive frequency band     Frequency segmentation    

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Calculation of collision frequency function for aerosol particles in free molecule regime in presence

Xiaowei LUO, Yannick BENICHOU, Suyuan YU

Frontiers in Energy 2013, Volume 7, Issue 4,   Pages 506-510 doi: 10.1007/s11708-013-0275-5

Abstract: The collision frequency function for aerosol particles has already been calculated for the free moleculeforce, electric force and molecular forces, created by particles themselves, recalculated the collision frequencyAttractive forces increase naturally the collision frequency, while repulsive forces decrease it.

Keywords： aerosol particles     collision frequency function     coagulation    

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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

Oscillation frequency of simplified arterial tubes

Hui AN, Fan HE, Lingxia XING, Xiaoyang LI

Journal Article

Dynamics of structural systems with various frequency-dependent damping models

Li LI,Yujin HU,Weiming DENG,Lei LÜ,Zhe DING

Journal Article

A novel period estimation method for X-ray pulsars based on frequency subdivision

Li-rong SHEN,Xiao-ping LI,Hai-feng SUN,Hai-yan FANG,Meng-fan XUE

Journal Article

Research on Prony’s method modeling in multi-target detection of stepped-frequency radar

Hu Tiling,Li Xingguo

Journal Article

Research on fuzzy neural network control method for high-frequency vacuum drying of wood

Jiang Bin,Sun Liping,Cao Jun and Zhou Zheng

Journal Article

Research of mid and high frequency response of complex mechanical structures using energy finite elementmethod

Zhu Danhui,Xie Miaoxia,Kong Xiangjie,Zhang Wenbo,Chen Hualing

Journal Article

Research on acoustic-structure sensitivity using FEM and BEM

ZHANG Jun, ZHAO Wenzhong, ZHANG Weiying

Journal Article

Soil seismic analysis for 2D oblique incident waves using exact free-field responses by frequency-basedfinite/infinite element method

Journal Article

Solving nonlinear differential equations of Vanderpol, Rayleigh and Duffing by AGM

M. R. AKBARI,D. D. GANJI,A. MAJIDIAN,A. R. AHMADI

Journal Article

Study on tension testing of short hangers in suspension bridges

Qi Dongchun,Guo Jian,Shen Ruili

Journal Article

Identification of dynamic stiffness matrix of bearing joint region

Feng HU, Bo WU, Youmin HU, Tielin SHI

Journal Article

A frequency error estimation for isogeometric analysis of Kirchhoff–Love cylindrical shells

Journal Article

A Cell Condition-Sensitive Frequency Segmentation Method Based on the Sub-Band Instantaneous Energy Spectrum

Zhaohui Zeng, Weihua Gui, Xiaofang Chen, Yongfang Xie, Hongliang Zhang, Yubo Sun

Journal Article

Calculation of collision frequency function for aerosol particles in free molecule regime in presence

Xiaowei LUO, Yannick BENICHOU, Suyuan YU

Journal Article