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Simulation Research on PWM Control in Excitation System of Generator

Jia Guixi,Xu Wei,Guo Baoyue,Zhang Chentang

Strategic Study of CAE 2005, Volume 7, Issue 6,   Pages 50-53

Abstract:

A high quality excitation system not only plays an important role in the stability of power systembut also can improve the performance of generators and power system.In this paper, a PWM rectifier is applied to excitation system of synchronous generators.;s supply by achieving low harmonic current conversion and improving high power factor transform of excitationSimulation results about design system through MATLAB are presented to show the obvious effect on the

Keywords： PWM     high power factor     excitation system     Matlab simulation    

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Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2,   Pages 203-213 doi: 10.1007/s11465-011-0131-4

Abstract:

Crack on a shaft is one of the common damages in a rotor system.vibrations are calculated to compare the influences of transverse crack and slant crack on the rotor systemResults show that the vibration amplitude of the rotor system with a 45° slant crack on the shafttorsional excitation are analyzed by considering opening and closing of the crack.and when the two bending stiffness are identical, the multiple frequency components of the torsional excitation

Keywords： rotor dynamics     slant crack     stability     torsional excitation     open and close    

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Approximation of structural damping and input excitation force

Mohammad SALAVATI

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 244-254 doi: 10.1007/s11709-016-0371-9

Abstract: proposed methods has been carried out through analytical and numerical simulation of the lumped mass system

Keywords： structural modal parameters     damping identification method     input excitation force identification     Inverse    

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Interactions between metal ions and the biopolymer in activated sludge: quantification and effects of system

Yun Zhou, Siqing Xia, Binh T. Nguyen, Min Long, Jiao Zhang, Zhiqiang Zhang

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 1, doi: 10.1007/s11783-017-0898-6

Abstract: Interactions of Pb(II) and biopolymer were quantified at various system pH values.System pH values significantly affect the quenching constant values for both peaks.Removal mechanism of metal ions by activated sludge system was further disclosed.The quantification and effects of system pH value on the interactions between Pb(II) and the biopolymerThe Ka values of peak B were bigger than those for peak A at the same system pH values.

Keywords： Metal ions     Biopolymer     Activated sludge     Three-dimensional excitation emission matrix (3D-EEM)     Fluorescence    

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A subband excitation substitute based scheme for narrowband speech watermarking Article

Wei LIU, Ai-qun HU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 5,   Pages 627-643 doi: 10.1631/FITEE.1601503

Abstract: Furthermore, a practical system implementation is proposed.imposed on a passband watermark signal by forcing its power level to be the same as the original passband excitation

Keywords： Analysis filter     Linear prediction     Narrowband speech watermarking     Passband excitation replacement    

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Excitation-emission matrix (EEM) fluorescence spectroscopy for characterization of organic matter in

Jinlan Yu, Kang Xiao, Wenchao Xue, Yue-xiao Shen, Jihua Tan, Shuai Liang, Yanfen Wang, Xia Huang

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 2, doi: 10.1007/s11783-019-1210-8

Abstract: membrane fouling performances of MBRs are essentially related to the dissolved organic matter (DOM) in the systemThree-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy, a powerful tool for

Keywords： excitation-emission matrix (EEM)     dissolved organic matter (DOM)     membrane bioreactor (MBR)     fluorescence    

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Fundamental frequency and testing mode of complicated elastic clamped-plate vibration

QI Hongyuan, GUAN Yiduo

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 360-364 doi: 10.1007/s11465-008-0084-4

Abstract: analyzing the fundamental frequency; meanwhile, according to hamming testing method of multi-point excitation

Keywords： multi-point excitation     rectangle-plate     single-point     processing technology     trigonometric interpolation    

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Investigations concerning seismic response control of self-anchored suspension bridge with MR dampers

YANG Menggang, HU Jianhua

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 1,   Pages 43-48 doi: 10.1007/s11709-008-0011-0

Abstract: the seismic response of self-anchored suspension bridges, equations of motion governing the coupled systemof bridge- magneto-rheological (MR) dampers subject to seismic excitation are formulated by employing

Keywords： longitudinal displacement     corresponding computer     excitation     phenomenological     self-anchored suspension    

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Control mode selection for modal control of long-span arch bridge

Zhengying LI, Zhengliang LI,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 4,   Pages 401-406 doi: 10.1007/s11709-009-0052-z

Abstract: This approach takes into consideration the effect of external seismic excitation and is more reasonablemethod of maximal modal displacement better analyze long-span arch bridge when multisupport seismic excitationThe reduced-order system also is more in line with the performance of the original model.

Keywords： selection     reduced-order     excitation     long-span     simplified    

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Study on damping properties of magnetorheological damper

ZHOU Yu-feng, CHEN Hua-ling

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4,   Pages 452-455 doi: 10.1007/s11465-006-0057-4

Abstract: well; the damping properties of the ameliorated structure of the MR damper have improved; when the excitationis a trigonal signal, the MR damper reveals a thinning effect at high velocity; and when the excitation

Keywords： nonlinear hysteretic     force-velocity     unsolved     excitation     magnetorheological    

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A Blasting Sources-Based Approach to Inspection of Faults in Dam

Zhou Hougui,Tan Kaiyan

Strategic Study of CAE 2007, Volume 9, Issue 4,   Pages 79-82

Abstract: In this paper, inspection principles, system integrity and key items of the new blasting source-based

Keywords： blasting source     dam     inspection of incipient fault     elastic wave     dynamic monitoring     excitation signal    

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Identification of sources, characteristics and photochemical transformations of dissolved organic matter with EEM-PARAFAC in the Wei River of China

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 5, doi: 10.1007/s11783-020-1340-z

Abstract:

• The source of DOM in surface water and sediment is inconsistent.

Keywords： Dissolved organic matter     Parallel factor analysis     Excitation-emission matrices     Photodegradation    

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Application of an efficient stochastic calculation method on the seismic analysis of an isolated structure

Wei GUO, Zhiwu YU

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 4,   Pages 379-384 doi: 10.1007/s11709-012-0180-8

Abstract: on this drawback, a new, more efficient stochastic calculation method, an improvement on the pseudo-excitation

Keywords： isolated structure     stochastic response     non-proportional damping     efficient     accurate     pseudo-excitation    

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Chemical identification and genotoxicity analysis of petrochemical industrial wastewater

Jing ZHANG, Shigong WANG, Can WANG, Hongying HU

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 3,   Pages 350-359 doi: 10.1007/s11783-012-0404-0

Abstract: The actual harmful effects of industrial wastewater can not be reflected by the conventional water quality index. Therefore, the change in dissolved organic matter and the genetic toxicity of petrochemical wastewater were observed in the current study by examining the wastewater treatment plant of a large petrochemical enterprise in Northwest China. Using XAD-8, MSC, and DA-7 resins, the wastewater was separated into six fractions, namely, hydrophobic acid (HOA), hydrophobic neutral (HOB), hydrophobic alkaline, hydrophilic acid, hydrophilic alkaline, and hydrophilic neutral. Umu-test was used to detect the genetic toxicity of the wastewater samples, and fluorescence spectra were also obtained to examine genetic toxic substances. The results show that wastewater treatment facilities can effectively reduce the concentration of organic matter in petrochemical wastewater ( <0.05). However, the mixing of aniline wastewater can increase the amount of organic carbon ( <0.05) and can overload facilities. This finding shows that the mixed collection and joint treatment of different types of petrochemical wastewater can affect the water quality of the effluent. Particularly, hydrophobic substances can be difficult to remove and account for a relatively large proportion of the effluent. The mixture of aniline wastewater can increase the genetic toxicity of the effluent ( <0.05), and biologic treatment can not effectively decrease the toxicity. Most of the genetic toxicology may exist in the HOA and HOB fractions. Fluorescence spectroscopy also confirms this result, and tryptophan-like substances may play an important role in genetic toxicity.

Keywords： dissolved organic matter     resin fraction     genetic toxicity     fluorescence excitation and emission matrix    

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Detection of solder bump defects on a flip chip using vibration analysis

Junchao LIU, Tielin SHI, Qi XIA, Guanglan LIAO

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 1,   Pages 29-37 doi: 10.1007/s11465-012-0314-7

Abstract: In this paper a nondestructive detection method combining ultrasonic excitation with vibration analysisanalytical model is revised by considering the influence of spring mass on mechanical energy of the system

Keywords： flip chip     defect detection     ultrasonic excitation     vibration analysis    

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Title Author Date Type Operation

Simulation Research on PWM Control in Excitation System of Generator

Jia Guixi,Xu Wei,Guo Baoyue,Zhang Chentang

Journal Article

Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Journal Article

Approximation of structural damping and input excitation force

Mohammad SALAVATI

Journal Article

Interactions between metal ions and the biopolymer in activated sludge: quantification and effects of system

Yun Zhou, Siqing Xia, Binh T. Nguyen, Min Long, Jiao Zhang, Zhiqiang Zhang

Journal Article

A subband excitation substitute based scheme for narrowband speech watermarking

Wei LIU, Ai-qun HU

Journal Article

Excitation-emission matrix (EEM) fluorescence spectroscopy for characterization of organic matter in

Jinlan Yu, Kang Xiao, Wenchao Xue, Yue-xiao Shen, Jihua Tan, Shuai Liang, Yanfen Wang, Xia Huang

Journal Article

Fundamental frequency and testing mode of complicated elastic clamped-plate vibration

QI Hongyuan, GUAN Yiduo

Journal Article

Investigations concerning seismic response control of self-anchored suspension bridge with MR dampers

YANG Menggang, HU Jianhua

Journal Article

Control mode selection for modal control of long-span arch bridge

Zhengying LI, Zhengliang LI,

Journal Article

Study on damping properties of magnetorheological damper

ZHOU Yu-feng, CHEN Hua-ling

Journal Article

A Blasting Sources-Based Approach to Inspection of Faults in Dam

Zhou Hougui,Tan Kaiyan

Journal Article

Identification of sources, characteristics and photochemical transformations of dissolved organic matter with EEM-PARAFAC in the Wei River of China

Journal Article

Application of an efficient stochastic calculation method on the seismic analysis of an isolated structure

Wei GUO, Zhiwu YU

Journal Article

Chemical identification and genotoxicity analysis of petrochemical industrial wastewater

Jing ZHANG, Shigong WANG, Can WANG, Hongying HU

Journal Article

Detection of solder bump defects on a flip chip using vibration analysis

Junchao LIU, Tielin SHI, Qi XIA, Guanglan LIAO

Journal Article