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Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 146-150 doi: 10.1007/s11465-006-0013-3

Abstract: In this paper, the acoustic leak signal is analyzed in the time-frequency domain.Based on the relation of time-frequency distribution of the acoustic leak signal and the dispersion curves

Keywords： dispersion     selection     guided     research     time-frequency    

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Non-stationary signal analysis based on general parameterized time--frequency transform and its application

Peng ZHOU, Zhike PENG, Shiqian CHEN, Yang YANG, Wenming ZHANG

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2,   Pages 292-300 doi: 10.1007/s11465-017-0443-0

Abstract: Since the time-frequency (TF) pattern of the vibration signal from the rotary machine often containscondition information and fault feature, the methods based on TF analysis have been widely-used to solveThis article introduces an effective non-stationary signal analysis method based on the general parameterizedtime–frequency transform (GPTFT).A multi-component instantaneous frequency (IF) extraction method is proposed based on it.

Keywords： rotary machines     condition monitoring     fault diagnosis     GPTFT     SCI    

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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: Flutter derivatives are essential for flutter analysis of long-span bridges, and they are generally identifiedmethod 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 derivatives

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

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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 frequencyis 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 solutionsthe isogeometric free vibration analysis of Kirchhoff–Love cylindrical shells.

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

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Analysis of frequency characteristics of compliant mechanisms

WANG Wenjing, YU Yueqing

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 3,   Pages 267-271 doi: 10.1007/s11465-007-0046-2

Abstract: Much work is needed for a further study on the dynamic analysis of compliant mechanisms to improve theirdifferentials of a stiffness matrix to design parameters, a method for calculating the sensitivity of natural frequencyThe numerical simulation results indicate that the design parameters have an impact on the frequencycharacteristics of the compliant mechanisms and the proposed method is more accurate and convenient for analyzing frequency

Keywords： compliant mechanisms     convenient     sensitivity     work     analysis    

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Analysis of planetary gear transmission in non-stationary operations

Fakher CHAARI, Mohamed Slim ABBES, Fernando Viadero RUEDA, Alfonso Fernandez del RINCON, Mohamed HADDAR

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 1,   Pages 88-94 doi: 10.1007/s11465-013-0361-8

Abstract: A combined amplitude and frequency modulation is observed which is well characterized using Short TimeFourier transform more suited than the spectral analysis.

Keywords： planetary gearbox     non-stationary conditions     variable load     dynamic response     time frequency analysis    

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Capacity limitation of nuclear units in grid based on analysis of frequency regulation

Yiping DAI, Pan JIANG, Lin GAO, Weimin KAN, Xiaoqing XIAO, Ge JIN

Frontiers in Energy 2012, Volume 6, Issue 2,   Pages 148-154 doi: 10.1007/s11708-012-0174-1

Abstract: Based on the analysis of frequency regulation, mathematic models for nuclear units in the grid are establishedThe relationship between different styles of frequency regulation and the allowable capacity of the nuclear

Keywords： nuclear units capacity     overspeed     primary frequency control (PFC)     second frequency control (SFC)    

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Meta-analysis of the diagnostic efficiency of frequency-doubling technology for primary glaucoma

LIU Ting, HE Xiangge

Frontiers of Medicine 2007, Volume 1, Issue 1,   Pages 109-114 doi: 10.1007/s11684-007-0021-7

Abstract: The overall diagnostic capabilities and utility of frequency-doubling technology (FDT) in patients withStatistical analysis was performed with Meta Test version 0.6 software to test the heterogeneity of theFinally, sensitivity analysis was performed.Sensitivity analysis demonstrated no disproportionate influences of individual studies.of good quality and FDT can be a highly efficient diagnostic test for primary glaucoma based on Meta-analysis

Keywords： inclusion     sensitivity analysis     correction     specificity     appropriate    

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Conformal analysis of fundamental frequency of vibration of elastic clamped plates

QI Hongyuan, ZHU Hengjun

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 429-432 doi: 10.1007/s11465-007-0073-z

Abstract: To calculate the fundamental frequency of vibration of special-shaped and elastic clamped plates, theGalerkin method is used to obtain the solution of fundamental frequency in the vibrating differentialFinally, taking ellipse elastic clamped plates as an example, the effects on fundamental frequency coefficient

Keywords： direction     theory     vibration     odd     complicated boundary    

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Short-term prediction of influent flow rate and ammonia concentration in municipal wastewater treatment plants

Shuai MA, Siyu ZENG, Xin DONG, Jining CHEN, Gustaf OLSSON

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 1,   Pages 128-136 doi: 10.1007/s11783-013-0598-9

Abstract: A systematic data analysis method is presented in this paper in order to estimate and predict the periodicitywavelet decomposition and reconstruction; 2) typical cycle identification using power spectrum density analysisTo give meaningful information for feedforward control systems, predictions in different time scalesperiodicity, the decreasing of prediction accuracy is not distinct with increasing of the prediction time

Keywords： influent load prediction     wavelet de-noising     power spectrum density     autoregressive model     time-frequencyanalysis     wastewater treatment    

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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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Design and analysis of a new high frequency double-servo direct drive rotary valve

Muzhi ZHU,Shengdun ZHAO,Jingxiang LI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 344-350 doi: 10.1007/s11465-016-0406-x

Abstract: investigated direct drive valve for many years to solve problems, such as fluid force imbalance and switching frequencyThis paper studied the high frequency double-servo direct drive rotary valve (DDRV), and proposed a novelstructure and drive method satisfying high reversing frequency and adequate quantity of flow.

Keywords： direct drive rotary valve     computational fluid dynamics (CFD)     flow regulation    

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General expression for linear and nonlinear time series models

Ren HUANG, Feiyun XU, Ruwen CHEN

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1,   Pages 15-24 doi: 10.1007/s11465-009-0015-z

Abstract: The typical time series models such as ARMA, AR, and MA are founded on the normality and stationarityThis paper proposes a general expression for linear and nonlinear auto-regressive time series modelsThe modeling and prediction accuracy of the GNAR model is superior to the classical time series models

Keywords： linear and nonlinear     autoregressive model     system identification     time series analysis    

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Prediction of characteristic blast-induced vibration frequency during underground excavation by using

Tae Un PAK; Guk Rae JO; Un Chol HAN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 8,   Pages 1029-1039 doi: 10.1007/s11709-022-0861-x

Abstract: Then, wavelet analysis on the measured results was carried out to identify frequency bands reflectingchanges of blasting vibration parameters such as vibration velocity and energy in different frequencyFrequency characteristics are then discussed in view of blast source distance and charge weight per delayFrom analysis of results, it can be found that peak velocity and energy of blasting vibration in frequencyMost frequency bands were affected by blasting source distance, and the frequency band of 0–62.5 Hz reflected

Keywords： wavelet analysis     blast-induced vibration     frequency characteristics     underground excavation    

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Title Author Date Type Operation

Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

Journal Article

Non-stationary signal analysis based on general parameterized time--frequency transform and its application

Peng ZHOU, Zhike PENG, Shiqian CHEN, Yang YANG, Wenming ZHANG

Journal Article

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

Zhengqing CHEN

Journal Article

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

Journal Article

Analysis of frequency characteristics of compliant mechanisms

WANG Wenjing, YU Yueqing

Journal Article

Analysis of planetary gear transmission in non-stationary operations

Fakher CHAARI, Mohamed Slim ABBES, Fernando Viadero RUEDA, Alfonso Fernandez del RINCON, Mohamed HADDAR

Journal Article

Capacity limitation of nuclear units in grid based on analysis of frequency regulation

Yiping DAI, Pan JIANG, Lin GAO, Weimin KAN, Xiaoqing XIAO, Ge JIN

Journal Article

Meta-analysis of the diagnostic efficiency of frequency-doubling technology for primary glaucoma

LIU Ting, HE Xiangge

Journal Article

Conformal analysis of fundamental frequency of vibration of elastic clamped plates

QI Hongyuan, ZHU Hengjun

Journal Article

Short-term prediction of influent flow rate and ammonia concentration in municipal wastewater treatment plants

Shuai MA, Siyu ZENG, Xin DONG, Jining CHEN, Gustaf OLSSON

Journal Article

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

He Baosheng,Liu Gang,Wang Shuangping,Wen Min

Journal Article

Design and analysis of a new high frequency double-servo direct drive rotary valve

Muzhi ZHU,Shengdun ZHAO,Jingxiang LI

Journal Article

General expression for linear and nonlinear time series models

Ren HUANG, Feiyun XU, Ruwen CHEN

Journal Article

Prediction of characteristic blast-induced vibration frequency during underground excavation by using

Tae Un PAK; Guk Rae JO; Un Chol HAN

Journal Article

Si Jingjian: High Frequency Time Series Data Reconstruction of Energy Finance Based on Compressed Sensing

10 Jun 2022

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