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Performance prediction of switched reluctance generator with time average and small signal models

Jyoti KOUJALAGI, B. UMAMAHESWARI, R. ARUMUGAM

Frontiers in Energy 2013, Volume 7, Issue 1,   Pages 56-68 doi: 10.1007/s11708-012-0216-8

Abstract: generator with time average and small signal models.The complete mathematical model is developed in three stages.Next, based on the switching behaviour, a time average model is obtained to measure the difference betweenthe excitation and generation time in each switching cycle.Finally, to track control voltage and current wave shapes, a small signal model is designed.

Keywords： generator     reluctance     switching model     small signal model     time average model    

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Concurrent fatigue crack growth simulation using extended finite element method

Zizi LU, Yongming LIU,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 3,   Pages 339-347 doi: 10.1007/s11709-010-0078-2

Abstract: paper, a concurrent simulation framework for fatigue crack growth analysis is proposed using a novel smalltime scale model for fatigue mechanism analysis and the extended finite element method (X-FEM) for fatigueThe proposed small time scale fatigue model does not require the cycle counting as those using the classicalThe small time scale fatigue model is integrated into the numerical simulation algorithm for concurrentModel predictions are compared with available experimental observations for model validation.

Keywords： small time scale model     extended finite element method (X-FEM)     crack growth     multiaxial    

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Multi-time scale dynamics in power electronics-dominated power systems

Xiaoming YUAN, Jiabing HU, Shijie CHENG

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 303-311 doi: 10.1007/s11465-017-0428-z

Abstract:

Electric power infrastructure has recently undergone a comprehensive transformation from electromagnetics to semiconductors. Such a development is attributed to the rapid growth of power electronic converter applications in the load side to realize energy conservation and on the supply side for renewable generations and power transmissions using high voltage direct current transmission. This transformation has altered the fundamental mechanism of power system dynamics, which demands the establishment of a new theory for power system control and protection. This paper presents thoughts on a theoretical framework for the coming semiconducting power systems.

Keywords： power electronics     power systems     multi-time scale dynamics     mass-spring-damping model     self-stabilizingand en-stabilizing property     multi-time scale power system stabilizer    

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Simulation and experimental improvement on a small-scale Stirling thermo-acoustic engine

Mao CHEN,Yonglin JU

Frontiers in Energy 2016, Volume 10, Issue 1,   Pages 37-45 doi: 10.1007/s11708-015-0390-6

Abstract: In this paper, the influence of the dimensions of the main parts of the small-scale Stirling thermo-acousticBased on the numerical simulation, a small-scale Stirling thermo-acoustic engine were constructed and

Keywords： thermo-acoustic Stirling engine     small-scale     simulation     experiment    

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Comprehensive comparison of small-scale natural gas liquefaction processes using brazed plate heat exchangers

Jitan WU, Yonglin JU

Frontiers in Energy 2020, Volume 14, Issue 4,   Pages 683-698 doi: 10.1007/s11708-020-0705-0

Abstract: The brazed plate heat exchanger (BPHE) has some advantages over the plate-fin heat exchanger (PFHE) when used in natural gas liquefaction processes, such as the convenient installation and transportation, as well as the high tolerance of carbon dioxide (CO ) impurities. However, the BPHEs with only two channels cannot be applied directly in the conventional liquefaction processes which are designed for multi-stream heat exchangers. Therefore, the liquefaction processes using BPHEs are different from the conventional PFHE processes. In this paper, four different liquefaction processes using BPHEs are optimized and comprehensively compared under respective optimal conditions. The processes are compared with respect to energy consumption, economic performance, and robustness. The genetic algorithm (GA) is applied as the optimization method and the total revenue requirement (TRR) method is adopted in the economic analysis. The results show that the modified single mixed refrigerant (MSMR) process with part of the refrigerant flowing back to the compressor at low temperatures has the lowest specific energy consumption but the worst robustness of the four processes. The MSMR with fully utilization of cold capacity of the refrigerant shows a satisfying robustness and the best economic performance. The research in this paper is helpful for the application of BPHEs in natural gas liquefaction processes.

Keywords： liquefied natural gas     brazed plate heat exchanger     energy consumption     economic performance     robustness    

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Large-scale model test study on the water pressure resistance of construction joints of karst tunnel

Frontiers of Structural and Civil Engineering   Pages 1249-1263 doi: 10.1007/s11709-023-0974-x

Abstract: Model tests and numerical calculations were adopted based on the New Yuanliangshan tunnel project toA large-scale model test was designed and conducted, innovatively transforming the external water pressureon the water pressure resistance of the construction joint were analyzed, and the reliability of the modelpressure resistance of the construction joint determined via numerical calculations is similar to the modeltest results, indicating that the model test results have high accuracy and reliability.

Keywords： karst tunnel     lining construction joint     water pressure resistance     large-scale model test     numerical    

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Cutting Force Model for a Small-diameter Helical Milling Cutter

LI Xiwen, YANG Shuzi, YANG Mingjin, XIE Shouyong

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 3,   Pages 272-277 doi: 10.1007/s11465-007-0047-1

Abstract: the milling process, the major flank wear land area (two-dimensional measurement for the wear) of a small-diameterBy analyzing the wearing characteristics of the cutter, a cutting force model based on the major flankThe cutting force model for the helical milling cutter is validated by experiments.The computational and experimental results show that the cutting force model is almost consistent withthe condition of a milling process that uses a small-diameter helical milling cutter.

Keywords： computational     corresponding     helical milling     theoretical foundation     Characteristic    

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Investigation on the integral output power model of a large-scale wind farm

BAO Nengsheng, MA Xiuqian, NI Weidou

Frontiers in Energy 2007, Volume 1, Issue 1,   Pages 67-78 doi: 10.1007/s11708-007-0006-x

Abstract: The integral output power model of a large-scale wind farm is needed when estimating the wind farm soutput over a period of time in the future.The actual wind speed power model and calculation method of a wind farm made up of many wind turbineThe calculation algorithms and steps of the integral output power model of a large-scale wind farm areThe characteristics of a large-scale wind farm are also discussed.

Keywords： power model     actual     energy     large-scale     practical measurement    

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Small-scale area survey and analyses of Xinjiang’s coal field fire in China

Zhong Maohua,Fu Tairan,Hu Zhongbin

Strategic Study of CAE 2010, Volume 12, Issue 1,   Pages 12-17

Abstract: Through a series of field surveys in Xinjiang, we made the small-scale area analysis of coal field fireThe results show that the method of small-scale area analysis is available for examining the extinguished

Keywords： coal field fire     thermal anomaly     temperature     small-scale     remote sensing    

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A small-scale silica gel-water adsorption system for domestic air conditioning and water heating by the

Y. YU, Q. W. PAN, L. W. WANG

Frontiers in Energy 2020, Volume 14, Issue 2,   Pages 328-336 doi: 10.1007/s11708-019-0623-1

Abstract: A small-scale silica gel-water adsorption system with modular adsorber, which utilizes solar energy toadsorption system is tested under different modes (different mass recovery, heat recovery, and cogeneration timeThe results show that the optimal time for cogeneration, mass recovery, and heat recovery are 600 s,

Keywords： silica gel-water     heat and mass recovery     solar energy     domestic cooling and heating    

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Time Series Diagnosing Analysis for the Fatigue Crack of Large-scale and Heavyburden Supporting Shafts

Li Xuejun,Bin Guangfu,Wang Yuqing

Strategic Study of CAE 2006, Volume 8, Issue 4,   Pages 50-53

Abstract:

Because of the unobserved sudden fatigue failure of the large-scale and heavyburden supporting shaftsthis type of supporting shafts construction characteristics and vibration signal characteristic, the modelof the vibration signal is established by the method of time series.Residual (timea2 and NRSS as the index to diagnose the fatigue crack of large-scale

Keywords： large-scale and heavyburden machine     supporting shaft     concealment part     fatigue crack     time series    

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Dynamic Coordinated Management Model of Programme in Large-Scale Construction Company

Feng Guo,Yi-qi Chen,Yi-qing Cai

Frontiers of Engineering Management 2015, Volume 2, Issue 3,   Pages 287-292 doi: 10.15302/J-FEM-2015041

Abstract: Large-scale construction companies develop rapidly when facing more and more opportunities and challengestheory to programme management according to the need of changing the existing management mode in large-scaleconstruction companies, then puts forward the dynamic coordinated management model composed of the dynamic

Keywords： large-scale construction company     programme     dynamic coordinated management     model    

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Piezoelectric inertial robot for operating in small pipelines based on stick-slip mechanism: modeling

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0697-z

Abstract: Small pipes exist in industrial and biomedical fields, and require microrobots with high operationalA dynamics model of the stick-slip system was established by combining the dynamics model of the drivingfoot system and the LuGre friction model, and the simulation analysis of the effect of system parameters

Keywords： pipeline robot     piezoelectric     inertial drive     stick-slip     large load capacity     dynamics model     small    

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A time−space porosity computational model for concrete under sulfate attack

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0985-7

Abstract: This study proposes a mechanical–chemical model to simulate the spatiotemporal distribution of the porosityIn addition, the expansion strain at the macro-scale is obtained using a stress analysis model of compositeand cement hydration on the diffusion of sulfate ions, the expansion deformation and porosity space−timeThe results demonstrate that the expansion strains calculated using the suggested model agree well withThe proposed model can forecast and assess the porosity of concrete covers and provide a credible approach

Keywords： deformation     porosity     internal expansion stress     external sulfate attack     mechanical–chemical coupling model    

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Regional seismic-damage prediction of buildings under mainshock–aftershock sequence

Xinzheng LU, Qingle CHENG, Zhen XU, Chen XIONG

Frontiers of Engineering Management 2021, Volume 8, Issue 1,   Pages 122-134 doi: 10.1007/s42524-019-0072-x

Abstract: Thus, the accurate and efficient prediction of aftershock-induced damage to buildings on a regional scaleof buildings under a mainshock–aftershock (MS–AS) sequence is proposed in this study based on city-scalenonlinear time-history analysis (THA).Moreover, city-scale nonlinear THA is adopted to predict building seismic damage subjected to MS–AS sequencesThe accuracy and reliability of city-scale nonlinear THA for an MS–AS sequence are validated by as-recorded

Keywords： regional seismic damage prediction     city-scale nonlinear time-history analysis     mainshock–aftershock sequence     multiple degree-of-freedom (MDOF) model     2014 Ludian earthquake    

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Title Author Date Type Operation

Performance prediction of switched reluctance generator with time average and small signal models

Jyoti KOUJALAGI, B. UMAMAHESWARI, R. ARUMUGAM

Journal Article

Concurrent fatigue crack growth simulation using extended finite element method

Zizi LU, Yongming LIU,

Journal Article

Multi-time scale dynamics in power electronics-dominated power systems

Xiaoming YUAN, Jiabing HU, Shijie CHENG

Journal Article

Simulation and experimental improvement on a small-scale Stirling thermo-acoustic engine

Mao CHEN,Yonglin JU

Journal Article

Comprehensive comparison of small-scale natural gas liquefaction processes using brazed plate heat exchangers

Jitan WU, Yonglin JU

Journal Article

Large-scale model test study on the water pressure resistance of construction joints of karst tunnel

Journal Article

Cutting Force Model for a Small-diameter Helical Milling Cutter

LI Xiwen, YANG Shuzi, YANG Mingjin, XIE Shouyong

Journal Article

Investigation on the integral output power model of a large-scale wind farm

BAO Nengsheng, MA Xiuqian, NI Weidou

Journal Article

Small-scale area survey and analyses of Xinjiang’s coal field fire in China

Zhong Maohua,Fu Tairan,Hu Zhongbin

Journal Article

A small-scale silica gel-water adsorption system for domestic air conditioning and water heating by the

Y. YU, Q. W. PAN, L. W. WANG

Journal Article

Time Series Diagnosing Analysis for the Fatigue Crack of Large-scale and Heavyburden Supporting Shafts

Li Xuejun,Bin Guangfu,Wang Yuqing

Journal Article

Dynamic Coordinated Management Model of Programme in Large-Scale Construction Company

Feng Guo,Yi-qi Chen,Yi-qing Cai

Journal Article

Piezoelectric inertial robot for operating in small pipelines based on stick-slip mechanism: modeling

Journal Article

A time−space porosity computational model for concrete under sulfate attack

Journal Article

Regional seismic-damage prediction of buildings under mainshock–aftershock sequence

Xinzheng LU, Qingle CHENG, Zhen XU, Chen XIONG

Journal Article