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Parameter identification of interconnected power system frequency after trip-out of high voltage transmission

Xuzhan ZHOU,Shanshan LIU,Mingkun WANG,Yiping DAI,Yaohua TANG

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 386-393 doi: 10.1007/s11708-014-0323-9

Abstract: Accurate modeling and parameters of high voltage (HV) grid are critical for stability research of systemfrequency.In this paper, simulation modeling of the system frequency was conducted of an interconnected power systemThe results of this paper can provide reference for the stability research of HV power grid.

Keywords： high voltage (HV) grid     frequency stability parameter identification     primary frequency regulation (PFR    

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Variational mode decomposition based modal parameter identification in civil engineering

Mingjie ZHANG, Fuyou XU

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1082-1094 doi: 10.1007/s11709-019-0537-3

Abstract: An out-put only modal parameter identification method based on variational mode decomposition (VMD) isThe proposed identification method can straightforwardly extract the mode shape vectors using the modalconducted to demonstrate the efficiency and highlight the superiority of the proposed method in modal parameteridentification using both free vibration and ambient vibration data.The proposed method is proved to be efficient and accurate in modal parameter identification for both

Keywords： modal parameter identification     variational mode decomposition     civil structure     nonlinear system     closely    

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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: study was made to identify the flutter derivatives of each model by using a time-domain method and a frequency-domainIt was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domainMore 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    

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Experimental study of modal parameter identification in a simulated ambient-excited structure

JI Xiaodong, QIAN Jiaru, XU Longhe

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 281-285 doi: 10.1007/s11709-007-0036-9

Abstract: Structure modal parameter online identification was used to monitor the structural health as evidenced

Keywords： eigensystem realization     eigen-sensitivity analysis     realization algorithm     vibration     effective    

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Kinematic Model Building and Servo Parameter Identification of 3-HSS Parallel Mechanism

YANG Zhi-yong, WU Jiang, HUANG Tian, NI Yan-bing

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 1,   Pages 60-66 doi: 10.1007/s11465-005-0019-2

Abstract: at a parallel mechanism with three degrees of freedom, a method for dynamic model building and the parameteridentification of its servosystem is presented.Based on the above model, a method to identify the servo parameter of the parallel mechanism is put upIn this method, the triangle-shaped input with variable frequency is adopted to offset the disadvantagesof pseudorandom number sequence in parameter identification, such as dramatically changing the vibration

Keywords： building     acceleration     additive     workspace     optimum performance    

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Inverse identification of the mechanical parameters of a pipeline hoop and analysis of the effect of

Ye GAO, Wei SUN

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3,   Pages 358-368 doi: 10.1007/s11465-019-0539-9

Abstract: identifying such parameters was described based on the measured natural frequencies and amplitudes of the frequencyOn the premise of selecting initial values reasonably, an inverse identification algorithm based on sensitivityAfter introducing the identified values into the analysis model, the reliability of the identificationResults indicated that the support stiffness and damping of the hoop exhibited frequency-dependent characteristics

Keywords： inverse identification     pipeline hoop     frequency response function     mechanical parameters     preload    

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Influence factors on natural frequencies of composite materials

Bo WANG, Feng ZHAO, Zixu ZHAO, Kunpeng XU

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 4,   Pages 571-584 doi: 10.1007/s11465-020-0592-4

Abstract: polynomial methods were used to derive the dynamic equations of composite materials and obtain the natural frequencyThe correctness of the analytical model was verified by modal hammering and frequency sweep tests.

Keywords： composite material     hammering and frequency sweep test     structural parameter     natural frequency    

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Damage identification of a large-span concrete cable-stayed bridge based on genetic algorithm

ZHU Jinsong, XIAO Rucheng

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2,   Pages 170-175 doi: 10.1007/s11709-007-0018-y

Abstract: The global stability of a structure, the stiffness of its main girder and concrete tower, and the variationThe efficiency and rationality of local elaborate non-damage-identification could be enhanced by theprimary damage identification of cable-stayed bridges on the basis of periodic detection of the cableThe genetic algorithms of damage identification for cable-stayed bridges were investigated in this paperA damage detection program for complex civil structure was generated to implement the identification

Keywords： accurate     primary     global stability     complex     identification    

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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.Nyquist array methodology is used to analyze the stability of MIMO-GPC.The parameters of MIMO-GPC can be determined by stability criterion.

Keywords： MIMO-GPC     frequency domain analysis     stability criterion    

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State identification of home appliance with transient features in residential buildings

Frontiers in Energy 2022, Volume 16, Issue 1,   Pages 130-143 doi: 10.1007/s11708-022-0822-z

Abstract: The proposed method was tested on a high-resolution data set such as Labeled hIgh-Frequency daTaset for

Keywords： disaggregation     online load disaggregation     Kalman filtering     factorial hidden Markov model (FHMM)     Labeled hIgh-Frequency    

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Research of the aerostatic and aerodynamic stability of super long-span cable-stayed bridges

Zhang Xinjun and Sun Hailing

Strategic Study of CAE 2014, Volume 16, Issue 3,   Pages 50-58

Abstract: length，the cable-stayed bridge tends to be a more slender structural system，and consequently the wind stabilityThree-dimensional nonlinear aerostatic and aerodynamic stability analysis of long-span bridges is usedto investigate the aerostatic and aerodynamic stability of a super long- span cable- stayed bridge withwith those of a suspension bridge with the similar main span，and considering from the aspect of wind stabilityIn addition，parametric analysis on the aerostatic and aerodynamic stability of super long-span cable-stayed

Keywords： super long-span cable-stayed bridge     aerostatic stability     aerodynamic stability     design parameter    

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Variable stiffness and damping magnetorheological isolator

Yang ZHOU, Xingyu WANG, Xianzhou ZHANG, Weihua LI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 310-315 doi: 10.1007/s11465-009-0039-4

Abstract: This paper presents the development and characterization of a magnetorheological (MR) fluid-based variable stiffness and damping isolator. The prototype of the MR fluid isolator is fabricated, and its dynamic behavior is measured under various applied magnetic fields. The parameters of the model under various magnetic fields are identified, and the dynamic performance of the isolator is evaluated in simulation. Experimental results indicate that both the stiffness and damping capability of the developed MR isolator can be controlled by an external magnetic field.

Keywords： magnetorheological (MR) fluid     stiffness     damping     mathematical model     dynamic performance     parameter identification    

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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 regionThe author deduces an identification model of the dynamic stiffness matrix from the synthetic substructureThe 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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Kinetic-compartmental modelling of potassium-containing cellulose feedstock gasification

Attila Egedy, Lívia Gyurik, Tamás Varga, Jun Zou, Norbert Miskolczi, Haiping Yang

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 4,   Pages 708-717 doi: 10.1007/s11705-018-1767-y

Abstract:

Biomass is of growing interest as a secondary energy source and can be converted to fuels with higher energy density especially by pyrolysis or gasification. Understanding the mechanism and the kinetics of biomass pyrolysis (thermal decomposition) and gasification (conversion of organic material to gases) could be the key to the design of industrial devices capable of processing vast amounts of biomass feedstock. In our work real product components obtained in pyrolysis were took into consideration as well as char and oil as lumped components, and the kinetic constants for a biomass model compound (cellulose) pyrolysis and gasification were identified based on a proposed simplified reaction mechanism within a compartment model structure. A laboratory scale reactor was used for the physical experiments containing consecutive fast pyrolysis and gasification stages using alkali metal (K) containing feedstock, which has a significant effect on the cellulose pyrolysis and gasification. The detailed model was implemented in MATLAB/Simulink environment, and the unknown kinetic parameters were identified based on experimental data. The model was validated based on measurement data, and a good agreement was found. Based on the validated first principle model the optimal parameters were determined as 0.15 mL/min steam flow rate, and 4% K content.

Keywords： biomass pyrolysis     kinetic parameter identification     compartment modelling     optimisation    

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Hydrogeological Parameter Identification Based on the Radial Basis Function Neural Networks

Zhang Junyan,Wei Lianwei,Han Weixiu,Shao Jingli,Cui Yali,Zhang Jianli

Strategic Study of CAE 2004, Volume 6, Issue 8,   Pages 74-78

Abstract:

The problem of hydrogeological parameter identification is actually a complex one.With the limit of identifying the parameter by traditional methods, the radial basis function neuralNot only the parameter identification is automatically realized, but also th.e problem of local optimization

Keywords： groundwater     hydrogeological parameter     radial basis function (RBF) neural networks     BP neural networks    

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Title Author Date Type Operation

Parameter identification of interconnected power system frequency after trip-out of high voltage transmission

Xuzhan ZHOU,Shanshan LIU,Mingkun WANG,Yiping DAI,Yaohua TANG

Journal Article

Variational mode decomposition based modal parameter identification in civil engineering

Mingjie ZHANG, Fuyou XU

Journal Article

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

Zhengqing CHEN

Journal Article

Experimental study of modal parameter identification in a simulated ambient-excited structure

JI Xiaodong, QIAN Jiaru, XU Longhe

Journal Article

Kinematic Model Building and Servo Parameter Identification of 3-HSS Parallel Mechanism

YANG Zhi-yong, WU Jiang, HUANG Tian, NI Yan-bing

Journal Article

Inverse identification of the mechanical parameters of a pipeline hoop and analysis of the effect of

Ye GAO, Wei SUN

Journal Article

Influence factors on natural frequencies of composite materials

Bo WANG, Feng ZHAO, Zixu ZHAO, Kunpeng XU

Journal Article

Damage identification of a large-span concrete cable-stayed bridge based on genetic algorithm

ZHU Jinsong, XIAO Rucheng

Journal Article

MIMO-GPC Stability Analysis Based on Frequency Domain

Sun Qinglin,Chen Zengqiang,Yuan Zhuzhi

Journal Article

State identification of home appliance with transient features in residential buildings

Journal Article

Research of the aerostatic and aerodynamic stability of super long-span cable-stayed bridges

Zhang Xinjun and Sun Hailing

Journal Article

Variable stiffness and damping magnetorheological isolator

Yang ZHOU, Xingyu WANG, Xianzhou ZHANG, Weihua LI

Journal Article

Identification of dynamic stiffness matrix of bearing joint region

Feng HU, Bo WU, Youmin HU, Tielin SHI

Journal Article

Kinetic-compartmental modelling of potassium-containing cellulose feedstock gasification

Attila Egedy, Lívia Gyurik, Tamás Varga, Jun Zou, Norbert Miskolczi, Haiping Yang

Journal Article

Hydrogeological Parameter Identification Based on the Radial Basis Function Neural Networks

Zhang Junyan,Wei Lianwei,Han Weixiu,Shao Jingli,Cui Yali,Zhang Jianli

Journal Article