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Finite Element Implementation of the Exponential Drucker-Prager Plasticity Model for Adhesive Joints

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 1765-1778页

作者： Kerati Suwanpakpraek Baramee Patamaprohm Sacharuck Pornpeerakeat Arisara Chaikittiratana Department of Mechanical and Aerospace Engineering Faculty of EngineeringKing Mongkut’s University of Technology North BangkokBangkok10800Thailand Department of Teacher training in Civil Engineering Faculty of Technical EducationKing Mongkut’s University of Technology North BangkokBangkok10800Thailand KMUTNB–TU Chemnitz Collaborative center for Lightweight Structures Technologies(LiST) King Mongkut’s University of Technology North BangkokBangkok10800Thailand

This paper deals with the numerical implementation of the exponential Drucker-Parger plasticitymodel in the commercial finite element software,ABAQUS,via user subroutine UMAT for adhesive joint *** influence of hydrostatic pressure on adhesive strength was investigated by a modified Arcan fixture designed particularly to induce a different state of hydrostatic pressure within an adhesive *** developed user subroutine UMAT,which utilizes an associated plastic flow during a plastic deformation,can provide a good agreement between the simulations and the experimental *** numerical stability at highly positive hydrostatic pressure loads for a very high order of exponential function can also be achieved compared to when a non-associated flow is used.

关键词： Exponential Drucker-Prager model modified-Arcan test finite element analysis plastic potential function

Preparation and Characterization of Mg-Doped GaN Nanowires by Au-Catalyzed Magnetron Sputtering Deposition

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Preparation and Characterization of Mg-Doped GaN Nanowires b...

Collusion Potential Assessment in Electricity Markets Considering Generation Flexibility

2014中国功能材料科技与产业高层论坛

作者： Ruguo Liang Rui Liang Gang Cao Feng Shi Engineering training center Shandong University Chengxi Power Supply Branch State Grid Tianjin Power School of Management Science and Engineering Shandong University of Finance and Economics College of Physics and Electronics Shandong Normal University

Mg-doped GaN nanowires have been successfully synthesized on Si(111)substrates by magnetron sputtering deposition through ammoniating GaO/Au thin films at 900℃for 15 min.X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),and photoluminescence(PL)spectrum were carried out to characterize microstructure,morphology,and optical property of GaN *** results demonstrate that the nanowires are single-crystal Mg-doped GaN with hexagonal wurtzite structure and high crystalline quality,which have the size of 40 nm in diameter and several tens of microns in length and good emission *** growth procedure mainly follows the VLS mechanism,and Au plays an important role as catalyst,and more defect energy is formed due to metallic Au and thus promote the growth of GaN nanowires.

关键词： Mg-doped GaN nanowires Magnetronsputtering deposition Catalyst Optical property Growth mechanism

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1551-1566页

作者： Teng Tu Yi Ding Peng Ji Minglei Bao Nan Shang Yonghua Song Dan Zeng College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Beijing Power Exchange center Co.Ltd. Beijing 100000China the Institute of Energy Strategy and Policy China Southern Power GridGuangzhou 510663China state Key Laboratory of Internet of Things for Smart City University of MacaoTaipaMacao SARChina China Electric Power Research Institute Nanjing 210037China.

The collusion among various generating units has been a problematic issue affecting the fairness and transparency of electricity ***,it is of great significance to assess the potential of such collusion in the electricity ***,the previous assessment studies primarily focused on the bidding behaviors of collusive generating units,without considering the influences of generation flexibility,such as ramp *** this paper,a novel assessment method is proposed to evaluate the collusion potential in the electricity market considering generation ***,a bi-level optimization model is developed to simulate the collusive strategies of dif-ferent generating units,including the withholding of generation capacities and ramp rates,as well as the uplifting of minimum outputs and bidding *** the upper-level problem,collusive generating units optimize their offering strategies to optimize the generation profits without violating the regulatory *** lower-level problem is a day-ahead economic dispatch model which minimizes the dispatching *** on the optimal collusive strategies determined by the bi-level model,a framework is then proposed to assess the collusion potential in electricity ***,price-based and profit-based indices are proposed to quantitatively evaluate the collusion potential of different generating ***,the proposed assessment method is validated on a modified IEEE 39-node *** numerical results demonstrated that generation flexibility can be exploited collusively for making excessive profits,particularly during load peaks and *** Terms-Collusionpotential,economic cdispatch,generation flexibility,ramp rates,strategic withholding.

关键词： Collusionpotentiale conomiccdispatch generation flexibility ramp rates strategic withholding.

Pre-trained Mol2Vec Embeddings as a Tool for Predicting Polymer Properties

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Chinese Journal of Polymer Science 2024年第12期42卷 2059-2068,I0014页

作者： Ivan Zlobin Nikita Toroptsev Gleb Averochkin Alexander Pavlov center NTI“Digital Materials Science:New Materials and Substances” Bauman Moscow State Technical University2S1 Baumanskaya St.5/1105005MoscowRussia A.N.Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences Vavilova St.28Bld.1119334MoscowRussia

Machine learning-assisted prediction of polymer properties prior to synthesis has the potential to significantly accelerate the discovery and development of new polymer *** date,several approaches have been implemented to represent the chemical structure in machine learning models,among which Mol2Vec embeddings have attracted considerable attention in the cheminformatics community since their introduction in ***,for small datasets,the use of chemical structure representations typically increases the dimensionality of the input dataset,resulting in a decrease in model ***,the limited diversity of polymer chemical structures hinders the training of reliable embeddings,necessitating complex task-specific architecture *** address these challenges,we examined the efficacy of Mol2Vec pre-trained embeddings in deriving vectorized representations of *** study assesses the impact of incorporating Mol2Vec compound vectors into the input features on the efficacy of a model reliant on the physical properties of 214 *** results will hopefully highlight the potential for improving prediction accuracy in polymer studies by incorporating pre-trained embeddings or promote their utilization when dealing with modestly sized polymer databases.

关键词： Properties prediction High dimensional embeddings Machine learning Mol2Vec

Design and Modeling of Electromagnetic Impedance Surfaces to Reduce Coupling between Antennas

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Wireless Engineering and Technology 2012年第3期3卷 152-159页

作者： Yong S.Joe Jean-Francois D.Essiben Jangsik Cho Eric R.Hedin center for Computational Nanosciences Department of Physics and AstronomyBall State UniversityMuncieUSA Department of Electrical Engineering Advanced Teachers’Training College for Technical EducationUniversity of DoualaDoualaCameroon Department of Informational Statistics Kyungsung UniversityBusanKorea.

We study the coupling problem of two waveguide antennas using the design of a two-dimensional inhomogeneous impedance structure with a fixed reflected field. Since this structure enables electromagnetic compatibility between antennas located on a plane, the behaviors of the electromagnetic field along the impedance structure are investigated. The method of moments is used to solve the integral equations and the numerical results are presented and analyzed. To reduce coupling between antennas, we need to take into account both the amplitude distribution of the field along the structure and in the openings of the antennas. In addition, while designing the structure, it is necessary to control the coefficient of decoupling.

关键词： Coupling Waveguide Impedance Structure Electromagnetic Compatibility

柔性直流输电并网风电厂的低电压穿越能力改进(英文)

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电力系统自动化 2015年第3期39卷 14-22页

作者： Ranjan SHARMA Qiuwei WU Seung Tae CHA Kim Hφj JENSEN Tony Wederberg RASMUSSEN Jacob ΦSTERGAARD Siemens Wind Power A/S center for Electric Power and Energy Department of Electrical EngineeringTechnical University

To achieve active control of the AC voltage magnitude of wind power plant(WPP)collector network and improve the fault ride-through(FRT)capability,an FRT scheme based on feed forward DC voltage control is presented for voltage source converter-high voltage direct current(VSC-HVDC)connected offshore *** steady state operation,an open loop AC voltage control is implemented at the WPP-side VSC of the HVDC system so that any possible control interactions between WPP-side VSC and VSC of wind turbine are *** during any grid fault,a dynamic AC voltage reference is made according to both the DC voltage error and AC active current from the WPP collector system,thus ensuring fast and robust FRT of the VSC-HVDC-connected offshore *** the unbalanced fault condition in the host power system,the resulting oscillatory DC voltage is directly used in the VSC AC voltage controller at the WPP side so that the WPP collector system voltage also reflects the unbalance in the main *** domain simulations are performed to verify the efficacy of the FRT scheme based on the proposed feed forward DC voltage *** results show satisfactory FRT responses of the VSC-HVDC-connected offshore WPP under balanced and unbalanced faults in the host power system,as is shown under a serious fault in the WPP collector network.

关键词：电网故障连接海上能力直流输电系统电压控制器不平衡故障电厂

Stability and Accuracy Considerations in the Design and Implementation of Wind Turbine Power Hardware in the Loop Platform

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CSEE Journal of Power and Energy Systems 2017年第2期3卷 167-175页

作者： Kui Luo Wenhui Shi Yongning Chi Qiuwei Wu Weisheng Wang state Key Laboratory of Operation and Control of Renewable Energy&Storage System China Electric Power Research Institute(CEPRI)Beijing 100192China center for Electric Power and Energy(CEE) Department of Electrical EngineeringTechnical University of Denmark(DTU)Kgs.Lyngby 2800Denmark

There is increasing interest in the evaluation of wind turbine control capabilities for providing grid *** hardware in the loop(PHIL)simulation is an advanced method that can be used for studying the interaction of hardware with the power network,as the scaled-down actual wind turbine is connected with a simulated system through an *** consideration must be made in the design of the PHIL platform to ensure that the system is stable and yields accurate *** paper presents a method for stabilizing the PHIL interface and improving the accuracy of PHIL simulation in a real-time *** method factors in both the power and voltage scaling level,and a phase compensation *** uses the reactive power control capability of the wind turbine inverter to eliminate the phase shift imposed by the feedback current *** is accomplished with no negative impact on the dynamic behavior of the wind *** PHIL simulation results demonstrate the effectiveness of the proposed stability analysis method and phase compensation *** strength of the platform is demonstrated by extending the simulation method to wind turbine control validation.

关键词： Phase compensation power hardware in the loop stability and accuracy wind turbine

The Research and Development of Integrated Operation-Maintenance Simulation training System

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Journal of Power and Energy Engineering 2014年第4期2卷 470-476页

作者： Feng Gao Xiue Zhang Lianzheng Zhao Beijing Kedong Electric Control System Co. Ltd. Beijing China Datong Electric Power Senior technical School Datong China Jibei Electric Power training center Beijing China

With deep development of state grid’s system of "Three Sets of Five [1]", China is in urgent need of establishing an appropriate type of simulation system to rapidly improve operation efficiency and the level of maintainers, which aim at the integrated operation of substation operation and maintenance service. This article gives an introduction of a simulation training system which is designed for operation-skills training in electrical systems. By the composition of the multiple subjects and skills training for operations staff, this system can provide human guarantee and intellectual support for the "Big-Centralized Overhal".

关键词： Substation Operation and Maintenance Integration The Simulation training

Focus on the Chicken Manure Power Generation in China: How to Promote the Biomass Waste Industry?

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Energy and Power Engineering 2021年第4期13卷 127-145页

作者： Han Li Pinjie Xie Chao Wang Zhuowen Mu College of Economics and Management Shanghai University of Electric Power Shanghai China Beijing Electric Power Transmission and Transformation Co. Ltd. Beijing China state grid Jiangsu Marketing Service center (Metrology center) Nanjing China

With the vigorous growth of animal husbandry, animal feces in the agriculture sector gradually deteriorate the environment. The chicken manure power generation is becoming viable and useful for energy conversion to comply with the context of environmental protection in China. Based on resource endowments and technical conditions, this paper studies the current situation of chicken manure power generation in China. Combined with the policy environment, the research conducts a PEST-SWOT matrix analysis to thoroughly look into the strengths and weaknesses, the opportunities and challenges. Then, the paper analyzes the distribution of chicken manure and gives some solutions from respects of government regulatory behavior, industrial-organizational behavior and corporation strategic behavior. Finally, it is concluded that: 1) the government should strengthen policy support by actively improving the subsidy mechanism and lowering the threshold of financing and credit;2) enterprises should focus on improving power generation technology and boiler treatment technology.

关键词： Biomass Chicken Manure Power Generation PEST-SWOT Solutions