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Preparation and Anti⁃arc Erosion Property of Ag Matrix Electrical Contact Material Reinforced by Novel Ti2Cd 认领 引用
1
作者 SUN Wanjie SHI Yuxin +4 位作者 DING Jianxiang REN Wanbin PAN Zhixiong ZHANG Peigen SUN Zhengming 《材料导报》 EI CAS CSCD 北大核心 2024年第21期190-196,共7页
Due to their outstanding electrical contact properties,Cd-containing silver-matrix electrical contact materials can meet the requirements of high stability and long life for military defense and aerospace applications... Due to their outstanding electrical contact properties,Cd-containing silver-matrix electrical contact materials can meet the requirements of high stability and long life for military defense and aerospace applications.In order to further reduce the Cd content under the premise of meeting the high-performance requirements,in this study,high-purity intermediate Ti2Cd powder of MAX phase(Ti2CdC)was synthesized with a pressureless technique and then applied to reinforce the Ag matrix.The Cd content of the as-prepared Ag/Ti2Cd composites was actually reduced by 38.31%compared with conventional Ag/CdO material.Based on the systematic study of the effect of heat treatment temperature on the physical phase,morphology,interface and comprehensive physical properties of Ag/Ti2Cd composites,the preferred samples(heat treated at 400°C for 1 h)showed high density(97.77%),low resistivity(2.34μΩ·cm),moderate hardness(90.8HV),high tensile strength(189.9 MPa),and exhibited good electrical contact performance after 40000 cycles of arc discharging under severe conditions(DC 28 V/20 A).The results of microscopic morphological evolution,phase change and elemental distribution of the electrical contact surface show that the combination of high stability of Ti2Cd reinforcing phase,good interfacial bonding with Ag matrix and improved melt pool viscosity in the primary stage of arc erosion,results in low and stable contact resistance(average value 13.20 mΩ)and welding force(average value 0.6 N),low fluctuation of static force(2.2-2.5 N).The decomposition and absorption energy of Ti2Cd and the arc extinguishing effect of Cd vapor are the main reasons for the stable arcing energy and arcing time of electric contacts in the late stage of arc erosion. 展开更多
关键词 low-voltage apparatus Ag matrix composite Ti-Cd compound electrical contact properties arc erosion mechanism
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IGBT Temperature Field Monitoring Based on Reduced-order Model 认领 引用 被引量：3
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作者 Ziyu Zhou Yi Su +3 位作者 Xu Zhang Chengde Tong Ping Zheng Mingjun Zhu 《CES Transactions on Electrical Machines and Systems》 CSCD 2023年第2期129-136,共8页
With the rapid development of the world economy,IGBT has been widely used in motor drive and electric energy conversion.In order to timely detect the fatigue damage of IGBT,it is necessary to monitor the junction temp... With the rapid development of the world economy,IGBT has been widely used in motor drive and electric energy conversion.In order to timely detect the fatigue damage of IGBT,it is necessary to monitor the junction temperature of IGBT.In order to realize the fast calculation of IGBT junction temperature,a finite element method of IGBT temperature field reduction is proposed in this paper.Firstly,the finite element calculation process of IGBT temperature field is introduced and the linear equations of finite element calculation of temperature field are derived.Temperature field data of different working conditions are obtained by finite element simulation to form the sample space.Then the covariance matrix of the sample space is constructed,whose proper orthogonal decomposition and modal extraction are carried out.Reasonable basis vector space is selected to complete the low dimensional expression of temperature vector inside and outside the sample space.Finally,the reduced-order model of temperature field finite element is obtained and solved.The results of the reduced order model are compared with those of the finite element method,and the performance of the reduced-order model is evaluated from two aspects of accuracy and rapidity. 展开更多
关键词 IGBT Junction temperature Proper orthogonal decomposition Reduced-order model
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A Combined Alignment Method for Strapdown Inertial Navigation System on Stationary Base 认领 引用
3
作者 Shuai Chen Xinzhi Liu +1 位作者 Qian Sun Ya Zhang 《Journal of Harbin Institute of Technology(New Series)》 CAS 2020年第6期57-71,共15页
Owing to the weak observability of the azimuth misalignment angle,alignment accuracy and time are always the contradictory issues in the initial alignment process of Strapdown Inertial Navigation System(SINS),which re... Owing to the weak observability of the azimuth misalignment angle,alignment accuracy and time are always the contradictory issues in the initial alignment process of Strapdown Inertial Navigation System(SINS),which requires a compromise between them.In this paper,a combined alignment mechanism is proposed to construct an observable and controllable system model,which can effectively achieve higher azimuth alignment accuracy during the fixed time period.First,the Reduced Order Kalman Filter(ROKF)alignment algorithm was utilized to calculate the misalignment angles in parallel with the classical gyrocompass alignment algorithm.Then,the misalignment angles calculated by the gyrocompass alignment method were used to formulate the augmented measurement model with zero velocity models.Finally,the zero velocity model of the ROKF method was switched into the augmented measurement model when the azimuth misalignment angle of the gyrocompass alignment method was close to steady situation.The combined alignment method was analyzed reasonably by the observability and the mathematical deduction.The comparison results of the numerical simulation and the experimental data test showed that the combined method had good performance in terms of estimation accuracy and consistency of the alignment results. 展开更多
关键词 inertial navigation instrumentation and measurement gyroscopes accelerometers Kalman filter measurement errors
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Robust Damping Method For Voltage Source Converter with LCL-type Filter Under Weak Grid Conditions 认领 引用 被引量：2
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作者 Huaiyuan Liu Dianguo Xu +1 位作者 Lei Li Qiang Gao 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2022年第5期1428-1437,共10页
Power electronic converters under weak grid conditions may trigger new dynamic stability problems.Even though massive internal and external damping methods have been investigated,their system costs and robustness have... Power electronic converters under weak grid conditions may trigger new dynamic stability problems.Even though massive internal and external damping methods have been investigated,their system costs and robustness have not been solved in an effective way.This paper first proposes a sensorless active damping method based on the grid current feedback filter.The mid-frequency non-passive region of converters can be reduced effectively,thus system stability improvement in weak grids can be realized.Then this paper analyzes the feedback filter which may bring about additional non-passive regions in high frequency.What’s more,it has a poor robustness.The residual mid-frequency non-passive region can be enlarged under converter parameter variations.Furthermore,this paper proposes a hybrid active damping method.The grid voltage is fed forward through a low pass filter.The robustness against parameter variation is greatly improved and the non-passive region in high frequency is also totally eliminated.In order to further improve the system robustness in high frequency,a simple passive damping is also added.The damping resistor is designed small to reduce the damping loss.The simulation and experimental results prove that the proposed sensorless method can realize robust damping in an economic way. 展开更多
关键词 Impedance based method LCL filter passivity robust damping
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