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A novel method to investigate voltage stability of IEEE-14 bus wind integrated system using PSAT

Satish KUMAR,Ashwani KUMAR,N. K. SHARMA

Frontiers in Energy 2020, Volume 14, Issue 2,   Pages 410-418 doi: 10.1007/s11708-016-0440-8

Abstract: When the load on the conventional grid system increases, various bus voltages of the system tend to decrease, causing serious voltage drop or voltage instability within the system.The wind energy system at one of the bus in the test system is integrated and the performance of thesystem is verified by calculating the power flow (PF) using the power system analysis tool box (PSAT)and line indices of the integrated test system.

Keywords： voltage stability     line indices     power system analysis tool box (PSAT)     wind system     line loading     power flow    

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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 shaftStability and dynamic characteristics of the rotor system with a 45° slant crack on the shaft underThe results are helpful for the understanding the dynamic behavior of a rotor system with a slant crack

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

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Analysis of stability and nonlinear response of rotor system with elliptical sliding bearing supports

LU Yanjun, LIU Heng, YU Lie, LI Qi, JIANG Ming, ZHANG Zhiyu

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 37-45 doi: 10.1007/s11465-007-0006-x

Abstract: The timescale, i.e., the unknown whirling period of Hopf bifurcation solution of bearing-rotor systemThe stability of the Hopf bifurcation solution can be detected when estimating Hopf bifurcation solutionThe nonlinear unbalanced periodic responses of the system are obtained by using PNF method and path-followingThe local stability and bifurcation behaviors of periodic motions are analyzed by Floquet theory.The numerical results revealed the rich and complex nonlinear behavior of the system, such as periodic

Keywords： computational     corrector mechanism     predictor corrector     multisolution     quasiperiodic    

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On the seismic stability analysis of reinforced rock slope and optimization of prestressed cables

Wenbo ZHENG, Xiaoying ZHUANG, Yongchang CAI

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 2,   Pages 132-146 doi: 10.1007/s11709-012-0152-z

Abstract: The evaluation of the seismic stability of high rock slopes is of vital importance to ensure the safepseudo-static force analysis based on the finite element method is developed to evaluate the seismic stabilityThe stabilization effects of prestressed cables on the seismic stability of the slope are studied, the

Keywords： high rock slope     reinforced system     optimization     prestressed cable     seismicity    

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Nonlinear analysis of pre-tensioned glass wall facade by stability function with initial imperfection

Siu-Lai CHAN, Yaopeng LIU, Andy LEE,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 3,   Pages 376-382 doi: 10.1007/s11709-010-0086-2

Abstract: The breakage of glass panes in this type of system occurs occasionally, likely to be due to error inin addition to other factors like glass impurity and stress concentration around opening in a spider systemThe resistance of lateral wind pressure of the system makes use of high tension force coupled with theThe stability function with initial curvature is used in place of the cubic function, which is only accurate

Keywords： tension system     glass wall     nonlinear analysis     pre-tensioning     second-order analysis    

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Multi-axle dynamic steering system of truck-howitzer

LI Yanliang, GAO Xiuhua, ZHANG Chunqiu, SUN Yubo

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1,   Pages 44-49 doi: 10.1007/s11465-008-0002-9

Abstract: Results indicate that the system stability is decided by the vehicle barycenter position and the lateralThe system rapidly responds, the vehicle smoothly steers, and its handling stability is prominently improved

Keywords： multi-axle     acceleration     relationship     smoothly     handling stability    

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Solvates and polymorphs of clindamycin phosphate: Structural, thermal stability and moisture stability

Junbo Gong, Dejiang Zhang, Yuanyuan Ran, Keke Zhang, Shichao Du

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 2,   Pages 220-230 doi: 10.1007/s11705-017-1624-4

Abstract: Clindamycin phosphate (CP), an antibacterial agent, has been reported to form several solid-state forms. The crystal structures of two CP solvates, a dimethyl sulfoxide (DMSO) solvate and a methanol/water solvate (solvate V), have been determined by single crystal X-ray diffraction. The properties and transformations of these forms were characterized by powder X-ray diffraction, Single-crystal X-ray diffraction, differential scanning calorimetry, thermo gravimetric analysis, hot-stage microscopy, and dynamic vapor sorption. Very different hydrogen bonding networks exist among the host-host and host-solvent molecules in the two crystal structures, resulting in different moisture stabilities. The thermal stabilities of the two solvates upon heating and desolvation were also studied. When the temperature was above the boiling point of methanol, solvate V converted to a polymorphic phase after a one step desolvation process, whereas the desolvation temperature of the DMSO solvate was below the boiling point of DMSO. At the relative humidity above 43%, the DMSO solvate transformed to a hydrate at 25 °C. In contrast, solvate V did not transform at any of the humidities studied.

Keywords： clindamycin phosphate     solvate     crystal structure     thermal stability     moisture stability    

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Evaluation and prediction of slope stability using machine learning approaches

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 821-833 doi: 10.1007/s11709-021-0742-8

Abstract: In this paper, the machine learning (ML) model is built for slope stability evaluation and meets the

Keywords： slope stability     factor of safety     regression     machine learning     repeated cross-validation    

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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 systemIn this paper, simulation modeling of the system frequency was conducted of an interconnected power systemBased on recorded tripping data of the HV transmission lines, system parameters were identified by usingbetween simulation results and recorded data verifies the validity of gird models and the accuracy of 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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Digitalization optical open loop test system for fiber optic gyroscope

ZHANG Deng-wei, SHU Xiao-wu, MU Xu-dong, LIU Cheng

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4,   Pages 434-438 doi: 10.1007/s11465-006-0053-8

Abstract: speedily, stably and expediently, and to realize the amity interface between human and machine, a digital systemAll the interface functions of GPIB and the hardware system are realized through FPGA.With a digital sampling and processing system designed with VC++ in Windows platform, the real-time controllingSo the design of the system is flexible, the reliability and the stability are improved, error rate isno more than 10, the highest bit rate is 8 MB/s and the open loop detection system for optic fiber gyros

Keywords： stability     real-time controlling     standardization     controlling procedure     complete digitalization    

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Theory and Method of Power System Integrated Security Region Irrelevant to Operation States: An Introduction Feature Article

Yixin Yu, Yanli Liu, Chao Qin, Tiankai Yang

Engineering 2020, Volume 6, Issue 7,   Pages 754-777 doi: 10.1016/j.eng.2019.11.016

Abstract:

How to comprehensively consider the power flow constraints and various stability constraints in aseries of power system optimization problems without affecting the calculation speed is always a problem, static voltage stability, and small disturbance stability.Based on this finding, the calculation time for power system probabilistic security assessment (i.e.,risk analysis) and power system optimization with security constraints can be decreased by orders of

Keywords： Security region     Composition     Power flow security     Static voltage stability     Small-disturbance stability     Transient stability     Dynamics nature     Topological and geometric characteristics Hyperplane    

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Modified Bishop method for stability analysis of weakly sloped subgrade under centrifuge model test

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 727-741 doi: 10.1007/s11709-021-0730-z

Abstract: The accuracy of traditional slice methods for computing the stability safety factor of weakly slopedIn this study, a novel modified Bishop method was developed to improve the accuracy of the stability

Keywords： weakly sloped subgrade     stability analysis     additional force     influential force     modified Bishop method    

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Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 522-532 doi: 10.1007/s11709-023-0930-9

Abstract: Engineering safety during maintenance outages is determined by the stability of the tunnel face.Disregarding the supporting effect of the cutterhead will result in a tunnel face with underestimated stability

Keywords： tunnel face stability     cutterhead configuration     aperture ratio     pressure gradient     support ratio    

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Stability and Instability of Systems—An Extended Discussion on Stir Kinetic Energy Conservation Law

Chen Gangyi,Ouyang Bolin,Yuan Dongsheng,Hao Liping,Zhou Lirong

Strategic Study of CAE 2005, Volume 7, Issue 8,   Pages 41-46

Abstract: authors think that stir kinetic energy conservation law is an important principle and analysis method for stabilityIt is not only an approach for explaining stability of system, but also the analysis method for evolutionismof system, and it points out some problems in Newton's theories as well.

Keywords： system construction     stir kinetic energy     stability and evolutionism    

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Recent research and development of PLGA/PLA microspheres/nanoparticles: A review in scientific and industrial aspects

Feng Qi, Jie Wu, Hao Li, Guanghui Ma

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 1,   Pages 14-27 doi: 10.1007/s11705-018-1729-4

Abstract: biocompatibility and biodegradability, they can be used in various areas, such as long-term release systemThere have been 15 products available on the US market, but the system still has many problems duringdevelopment and manufacturing, such as wide size distribution, drug stability issues, and so on.The review provides an overview on the development of the system in pharmaceutical industry.

Keywords： PLGA     microspheres     drug delivery system     stability     manufacturing    

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Title Author Date Type Operation

A novel method to investigate voltage stability of IEEE-14 bus wind integrated system using PSAT

Satish KUMAR,Ashwani KUMAR,N. K. SHARMA

Journal Article

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

Yanli LIN, Xiaohui SI, Fulei CHU

Journal Article

Analysis of stability and nonlinear response of rotor system with elliptical sliding bearing supports

LU Yanjun, LIU Heng, YU Lie, LI Qi, JIANG Ming, ZHANG Zhiyu

Journal Article

On the seismic stability analysis of reinforced rock slope and optimization of prestressed cables

Wenbo ZHENG, Xiaoying ZHUANG, Yongchang CAI

Journal Article

Nonlinear analysis of pre-tensioned glass wall facade by stability function with initial imperfection

Siu-Lai CHAN, Yaopeng LIU, Andy LEE,

Journal Article

Multi-axle dynamic steering system of truck-howitzer

LI Yanliang, GAO Xiuhua, ZHANG Chunqiu, SUN Yubo

Journal Article

Solvates and polymorphs of clindamycin phosphate: Structural, thermal stability and moisture stability

Junbo Gong, Dejiang Zhang, Yuanyuan Ran, Keke Zhang, Shichao Du

Journal Article

Evaluation and prediction of slope stability using machine learning approaches

Journal Article

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

Digitalization optical open loop test system for fiber optic gyroscope

ZHANG Deng-wei, SHU Xiao-wu, MU Xu-dong, LIU Cheng

Journal Article

Theory and Method of Power System Integrated Security Region Irrelevant to Operation States: An Introduction

Yixin Yu, Yanli Liu, Chao Qin, Tiankai Yang

Journal Article

Modified Bishop method for stability analysis of weakly sloped subgrade under centrifuge model test

Journal Article

Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Journal Article

Stability and Instability of Systems—An Extended Discussion on Stir Kinetic Energy Conservation Law

Chen Gangyi,Ouyang Bolin,Yuan Dongsheng,Hao Liping,Zhou Lirong

Journal Article

Recent research and development of PLGA/PLA microspheres/nanoparticles: A review in scientific and industrial aspects

Feng Qi, Jie Wu, Hao Li, Guanghui Ma

Journal Article