期刊文献+
共找到73篇文章
< 1 2 4 >
每页显示 20 50 100
Synthesis of Ni/Al System Intermetallic Compound Under the Influence of Pulsating Electric Current
1
作者 胡建华 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2003年第2期38-40,共3页
Synthesis of Ni/Al system intermetallic compound under the influence of pulsating electric current is researched.Reactions of Ni/Al system intermetallic compound are analyzed.It is found that solid-state reactions occ... Synthesis of Ni/Al system intermetallic compound under the influence of pulsating electric current is researched.Reactions of Ni/Al system intermetallic compound are analyzed.It is found that solid-state reactions occur at Ni/Al interface and the main way of reactions is atoms diffusing each other under the influence of a high-density pulsating electric current. 展开更多
关键词 pulsating electric current self-propagating high-temperature synthesis Ni/Al system intermetallic compound
下载PDF
Tribological and electric-arc behaviors of carbon/copper pair during sliding friction process with electric current applied 被引量:18
2
作者 林修洲 朱旻昊 +3 位作者 莫继良 陈光雄 金学松 周仲荣 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第2期292-299,共8页
The tribological behaviors of carbon block sliding against copper ring with and without electric current applied were investigated by using an advanced multifunctional friction and wear tester, and the electric-arc be... The tribological behaviors of carbon block sliding against copper ring with and without electric current applied were investigated by using an advanced multifunctional friction and wear tester, and the electric-arc behaviors were analyzed in detail. The results show that the normal load is one of the main controlling factors for generation of electric arc during friction process with electric current applied. The strength of electric arc is enhanced with the decrease of normal loads and the increase of electric currents. The unstable friction process and the fluctuated dynamic friction coefficients are strongly dependent upon the electric arc. The wear volumes and the wear mechanism of carbon brush were affected by the electric arc obviously. As no electric arc occurs, no clear discrepancy of the wear volumes of the carbon samples with and without electric current applied could be detected. While the wear mechanisms are mainly mechanical wear. However, under the condition of the electric arc appearance, the wear volume of carbon with electric current applied increases much more rapidly than that without electric current applied and also increases obviously with the increase of electric current strengths and the decrease of normal loads. The wear mechanisms of carbon block are mainly electric arc ablation accompanying with adhesive wear and material transferring. 展开更多
关键词 friction wear electric current electric arc carbon/copper
下载PDF
Effect of electrical current on tribological property of Cu matrix composite reinforced by carbon nanotubes 被引量:9
3
作者 许玮 胡锐 +1 位作者 李金山 傅恒志 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第10期2237-2241,共5页
Cu matrix composite reinforced with 10%(volume fraction) carbon nanotubes(CNTs/Cu) and pure Cu bulk were prepared by powder metallurgy techniques under the same consolidation processing condition.The effect of ele... Cu matrix composite reinforced with 10%(volume fraction) carbon nanotubes(CNTs/Cu) and pure Cu bulk were prepared by powder metallurgy techniques under the same consolidation processing condition.The effect of electrical current on tribological property of the materials was investigated by using a pin-on-disk friction and wear tester.The results show that the friction coefficient and wear rate of CNTs/Cu composite as well as those of pure Cu bulk increase with increasing the electrical current without exception,and the effect of electrical current is more obvious on tribological property of pure Cu bulk than on that of CNTs/Cu composite;the dominant wear mechanisms are arc erosion wear and plastic flow deformation,respectively;CNTs can improve tribological property of Cu matrix composites with electrical current. 展开更多
关键词 CNTs/Cu composite pure Cu bulk electrical current tribological property
下载PDF
Migration behavior of solidification nuclei in pure Al melt under effect of electric current pulse 被引量:4
4
作者 李希彬 芦凤桂 +1 位作者 崔海超 唐新华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第1期192-198,共7页
A mathematical model considering free nuclei was developed to reveal the migration behavior of the free nuclei. Numerical simulation results show that most of the nuclei on the top surface of the melt move downwards a... A mathematical model considering free nuclei was developed to reveal the migration behavior of the free nuclei. Numerical simulation results show that most of the nuclei on the top surface of the melt move downwards and distribute randomly inside the Al melt, which induces more nucleation sites resulting in grain refinement. At the same time, the effect of nuclei size on the nuclei distribution and refinement employing electric current pulse (ECP) was also investigated. The smaller nuclei migrate a short distance with the Al melt at lower speed. But for the larger nuclei, the migration downwards with higher speed benefits the refinement of interior grains of the melt. The research results help to better understand the refinement process and provide a more reasonable explanation of the grain refinement mechanism using ECP. 展开更多
关键词 electric current pulse solidification process grain refinement mechanism migration behavior numerical simulation
下载PDF
Effect of electrodes and thermal insulators on grain refinement by electric current pulse 被引量:5
5
作者 尹振兴 梁冬 +2 位作者 陈玉娥 程誉锋 翟启杰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第1期92-97,共6页
The application of electric current pulse(ECP) to a solidification process refers to the immersion of electrodes into the liquid metal and the employment of thermal insulators on the upper surface of metal.In order ... The application of electric current pulse(ECP) to a solidification process refers to the immersion of electrodes into the liquid metal and the employment of thermal insulators on the upper surface of metal.In order to ascertain the effects of these two factors on the structure refinement by the ECP technique,three groups of experiments were performed with different types of electrodes or various thermal insulators.By the comparison between solidification structures under different conditions,it is followed that the electrode and the thermal insulator have an obvious influence on the grain refinement under an applied ECP,and further analysis demonstrates that the thermal conditions of the liquid surface play a vital role in the modification of solidification structure.Also,the results support the viewpoint that most of the equiaxed grains originate from the liquid surface subjected to an ECP. 展开更多
关键词 solidification structure grain refinement electric current pulse electrode thermal insulator
下载PDF
Effects of direct current electric field on corrosion behaviour of copper, Cl- ion migration behaviour and dendrites growth under thin electrolyte layer 被引量:11
6
作者 黄华良 潘志权 +1 位作者 郭兴蓬 邱于兵 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第1期285-291,共7页
Effect of direct current electric field (DCEF) on corrosion behaviour of copper printed circuit board (PCB-Cu), Cl-ion migration behaviour, dendrites growth under thin electrolyte layer was investigated using pote... Effect of direct current electric field (DCEF) on corrosion behaviour of copper printed circuit board (PCB-Cu), Cl-ion migration behaviour, dendrites growth under thin electrolyte layer was investigated using potentiodynamic polarization and scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS). Results indicate that DCEF decreases the corrosion of PCB-Cu;Cl-ions directionally migrate from the negative pole to the positive pole, and enrich on the surface of the positive pole, which causes serious localized corrosion; dendrites grow on the surface of the negative pole, and the rate and scale of dendrite growth become faster and greater with the increase of external voltage and exposure time, respectively. 展开更多
关键词 COPPER DENDRITES MIGRATION direct current electric field thin electrolyte layer copper printed circuit board
下载PDF
Analyses of Current Electricity Price and Its Changing Trend Forecast in the Coming Five Years
7
作者 黄少中 《Electricity》 2002年第2期5-8,共4页
This paper analyzes the level, characteristics and existing problems of current electricityprice in China. Under the present circumstances the overall orientation of power price reform inthe 10th Five-year Plan period... This paper analyzes the level, characteristics and existing problems of current electricityprice in China. Under the present circumstances the overall orientation of power price reform inthe 10th Five-year Plan period should satisfy the requirements of power industry restructuring.Therefore, it is necessary to set up an appropriate pricing mechanism and system including thelinks of sales price to network, transmission and distribution price (T&D price) and sales price.In the light of various factors influencing increase and decrease in price, a forecast of electricitytariff is given in the five years to come.[ 展开更多
关键词 current electricity price electricity price forecasting sales price to network T&Dprice sales price
下载PDF
Tribological behavior of CNTs-Cu and graphite-Cu composites with electric current 被引量:11
8
作者 XU Wei HU Rui +2 位作者 LI Jin-shan ZHANG Yong-zhen FU Heng-zhi 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第1期78-84,共7页
CNTs-Cu and graphite-Cu composites were separately prepared by powder metallurgy technique under the same consolidation processing. Tribological behavior of the composites with electric current was investigated by usi... CNTs-Cu and graphite-Cu composites were separately prepared by powder metallurgy technique under the same consolidation processing. Tribological behavior of the composites with electric current was investigated by using a pin-on-disk friction and wear tester. The results show that the friction coefficient and wear rate of the composites decrease with increasing the reinforcement content, and increase with increasing the electric current density; the effects of electric current are more obvious on tribological properties of graphite-Cu composites than on CNTs-Cu composites; for graphite-Cu composites the dominant wear mechanisms are electric arc erosion and adhesive wear, while for CNTs-Cu composites are adhesive wear. 展开更多
关键词 Cu matrix composite tribological behaviors electric current wear mechanisms
下载PDF
Effect of Electrical Current on the Tribological Behavior of the Cu-WS_2-G Composites in Air and Vacuum 被引量:8
9
作者 QIAN Gang FENG Yi +3 位作者 LI Bin HUANG Shiyin LIU Hongjuan DING Kewang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第2期384-392,共9页
As the traditional graphite-based composites cannot meet the requirement of rapid developing modern industry, novel sliding electrical contact materials with high self-lubricating performance in multiple environments ... As the traditional graphite-based composites cannot meet the requirement of rapid developing modern industry, novel sliding electrical contact materials with high self-lubricating performance in multiple environments are eagerly required. Herein a copper-based composite with WS2 and graphite as solid lubricant are fabricated by powder metallurgy hot-pressed method. The friction and wear behaviors of the composites with and without current are investigated under the condition with sliding velocity of 10 m/s and normal load of 2.5N/cm 2 in both air and vacuum. Morphologies of the worn surfaces are observed by optical microscope and compositions of the lubricating films are analyzed by XPS. Surface profile curves and roughness of the worn surfaces are obtained by 2205 surface profiler. The results of wear tests show that the friction coefficient and wear volume loss of the composites with current are greater than that without current in both air and vacuum due to the adverse effects of electrical current which damaged the lubricating film partially and roughed the worn surfaces. XPS results demonstrate that the lubricating film formed in air is composed of oxides of Cu, WS2 , elemental S and graphite, while the lubricating film formed in vacuum is composed of Cu, WS2 and graphite. Because of the synergetic lubricating action of oxides of Cu, WS2 and graphite, the composites show low friction coefficient and wear volume loss in air condition. Owing to the fact that graphite loses its lubricity which makes WS2 become the only lubricant, severe adhesive and abrasive wear occur and result in a high value of wear rate in vacuum condition. The formation of the lubricating film on the contact interface between the brush and ring is one of the factors which can greatly affect the wear performance of the brushes. The low contact voltage drop of the composites in vacuum condition is attributed to the high content of Cu in the surface film. This study fabricated a kind of new sliding electrical contact self-lubricating composite with dual-lubricant which can work well in both air and vacuum environments and provides a comprehensive analysis on the lubrication mechanisms of the composite. 展开更多
关键词 Cu-WS2-G composites electrical current air and vacuum environments friction and wear contact voltage drop
下载PDF
Microstructure and properties of ultra-fine tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering 被引量:10
10
作者 李小强 辛红伟 +1 位作者 胡可 李元元 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第3期443-449,共7页
The microstructure and properties of the 93W-4Ni-2Co-1Fe(mass fraction,%) tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering from mixed elemental powders were investigated.A... The microstructure and properties of the 93W-4Ni-2Co-1Fe(mass fraction,%) tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering from mixed elemental powders were investigated.After 15 h milling,the average W grain size in the powders is decreased to 120 nm.For the powders milled for 15 h,the density,hardness and transverse rupture strength of the alloys sintered only by an intensive pulse electric current are the maximum.When the total sintering time keeps constant,the properties of the sintered alloys can be obviously improved by optimizing the sintering time of pulse-and constant-currents.A bulk ultrafine alloy with an average W grain size of about 340 nm can be obtained by sintering 15 h-milled powders in a total sintering time of 6 min.The corresponding sintered density,hardness and transverse rupture strength reach 16.78 g /cm3,HRA84.3 and 968 MPa,respectively. 展开更多
关键词 93W-4Ni-2Co-1Fe alloy mechanical alloying electric current activated sintering
下载PDF
Single Bubble Behavior in Direct Current Electric Field 被引量:10
11
作者 彭耀 陈凤 +1 位作者 宋耀祖 陈民 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第2期178-183,共6页
The investigation on bubble behavior in electric field helps to analyze the mechanism of electric enhancement of boiling heat transfer. Experiments were performed to investigate the bubble deformation in direct curre... The investigation on bubble behavior in electric field helps to analyze the mechanism of electric enhancement of boiling heat transfer. Experiments were performed to investigate the bubble deformation in direct current (DC) electric field with bubbles attached to the orifice. The air bubbles were slowly generated in the transformer oil pool at different orifices, so that the effect of flow on bubble shape was eliminated. The results showed that the bubbles were elongated and the departure volume decreased when the electric field was intensified. The major and minor axes, aspect ratio and departure volume increased with increasing the orifice diameter. Both the electric field and orifice size have great influence on bubble behavior. The bubble deformation was also simulated to compare with the experimental results. The numerical and experimental data qualitatively agree with each other. 展开更多
关键词 electrohydrodynamic enhancement multiphase flow bubble behavior direct current electric field
下载PDF
Influences of pulse electric current treatment on solidification microstructures and mechanical properties of Al-Si piston alloys 被引量:6
12
作者 Ding Hongsheng Zhang Yong +5 位作者 Jiang Sanyong Chen Ruirun Zhao Zhilong Guo Jingjie Xu Daming Fu Hengzhi 《China Foundry》 SCIE CAS 2009年第1期24-31,共8页
Three kinds of AI-Si piston alloys were prepared and subjected to pulse electric current treatment (PECT) at different pouring temperatures. Some aspects of the solidification microstructures were examined including... Three kinds of AI-Si piston alloys were prepared and subjected to pulse electric current treatment (PECT) at different pouring temperatures. Some aspects of the solidification microstructures were examined including the morphology and the distribution of the matrix and the secondary phases by using of optical microscopy (OM), SEM and EDS methods. Results indicate that PECT can refine the grains of α-AI in the alloys as effectively as chemical modification by sodium salt. The processing parameters of PECT on the multi-component AI-Si alloys were then optimized through the testing of tensile strength, elongation and microhardness of the prepared alloys. A new theory was put forward to explain the mechanism of PECT. 展开更多
关键词 pulse electric current AI-Si piston alloys SOLIDIFICATION
下载PDF
Microstructure and Temperature Distribution in ZnAl_2O_4 Sintered Body by Pulse Electric Current 被引量:3
13
作者 Dongming ZHANG, Zhengyi FU and Jingkun GUOState Key Lab. of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第6期526-528,共3页
Microstructure of reaction sintering of ZnAl2O4 at 1500℃ by hot-pressing(HP) and pulse electric current was investigated. The results indicated that the existed cracks in sintered body were caused by structure mismat... Microstructure of reaction sintering of ZnAl2O4 at 1500℃ by hot-pressing(HP) and pulse electric current was investigated. The results indicated that the existed cracks in sintered body were caused by structure mismatch. It is the evidence that periodical temperature field existed during pulse electric current sintering of nonconductive materials. The distance between high temperature areas was related to die diameter. 展开更多
关键词 Pulse electric current sintering Reaction sintering ZnAl2O4 Microstructure Temperature distribution.
下载PDF
Electric Current-induced Failure of 200-nm-thick Gold Interconnects 被引量:1
14
作者 Bin ZHANG Qingyuan YU +1 位作者 Jun TAN Guangping ZHANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第6期895-898,共4页
200-nm-thick Au interconnects on a quartz substrate were tested in-situ inside a dual-beam microscope by applying direct current, alternating current and alternating current with a small direct current component. The ... 200-nm-thick Au interconnects on a quartz substrate were tested in-situ inside a dual-beam microscope by applying direct current, alternating current and alternating current with a small direct current component. The failure behavior of the Au interconnects under three kinds of electric currents were characterized in-situ by scanning electron microscopy. It is found that the formation of voids and subsequent growth perpendicular to the interconnect direction is the fatal failure mode for all the Au interconnects under three kinds of electric currents. The failure mechanism of the ultrathin metal lines induced by the electric currents was analyzed. 展开更多
关键词 Au interconnect electric current Thermal fatigue FAILURE
下载PDF
Photon-Assisted Heat Generation by Electric Current in a Quantum Dot Attached to Ferromagnetic Leads
15
作者 迟锋 孙连亮 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第11期87-91,共5页
Heat generated by electric current in a quantum dot device contacting a phonon bath is studied using the non- equilibrium Green function technique. Spin-polarized current is generated owing to the Zeeman splitting of ... Heat generated by electric current in a quantum dot device contacting a phonon bath is studied using the non- equilibrium Green function technique. Spin-polarized current is generated owing to the Zeeman splitting of the dot level. The current's strength and the spin polarization are further manipulated by changing the frequency of an applied photon field and the ferromagnetism on the leads. We find that the associated heat by this spin- polarized current emerges even if the bias voltage is smaller than the phonon energy quanta and obvious negative differential of the heat generation develops when the photon frequency exceeds that of the phonon. It is also found that both the strength and the resonant peaks' position of the heat generation can be tuned by changing the value and the arrangement configurations of the magnetic moments of the two leads, and then provides an effective method to generate large spin-polarized current with weak heat. Such a result may be useful in designing low energy consumption spintronic devices. 展开更多
关键词 by on heat is of in Photon-Assisted Heat Generation by electric current in a Quantum Dot Attached to Ferromagnetic Leads
下载PDF
Influence of Electric Current on Kirkendall Diffusion of Zn/Cu Couples
16
作者 Yingju LI Yuansheng YANG Xiaohui FENG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第3期410-414,共5页
The influence of electric current on Kirkendall diffusion in Zn/Cu couples was investigated. Under the action of different electric currents, the Zn/Cu diffusion couples were annealed at 785℃ for different holding ti... The influence of electric current on Kirkendall diffusion in Zn/Cu couples was investigated. Under the action of different electric currents, the Zn/Cu diffusion couples were annealed at 785℃ for different holding time. The experimental results show that the displacement of the Kirkendall plane increases with increasing holding time. However, the displacement of the Kirkendall plane with electric current is larger than that without electric current. The relationship between the displacement of the Kirkendall plane and the holding time is changed under the action of electric current. The likely reason for the electric current enhancing effect is the energy transfer from electron to jumping atom, increasing the integrated diffusion coefficient, which leads to the increase in the velocity of Kirkendall plane. 展开更多
关键词 electric current ELECTROMIGRATION Kirkendall effect Darken equations
下载PDF
NONLINEAR STABILITY ANALYSIS OF A CLAMPED ROD CARRYING ELECTRIC CURRENT
17
作者 程昌钧 杨骁 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1997年第9期825-834,共10页
This paper is devoted to the analysis of the nonlinear Stability of a clamped rodcarrying electric current in the magnetic field which is produced by the current frowingin a pair of inifinitely long parallel rigid wi... This paper is devoted to the analysis of the nonlinear Stability of a clamped rodcarrying electric current in the magnetic field which is produced by the current frowingin a pair of inifinitely long parallel rigid wires. The natural State of the rod is in theplane of the wires and is equidistant from them.Firstly under the assumption of apatial deformation, the governing equations of the problem are derived, and the linearizedproblem and critical currents are discussed. Secondly, it ls proved that the buckledstates of the rod are always in planes. Finally. the global responses of the bifurcationproblem of the rod are compuled numerically and the distributions of the deflections.axial forces and bending monents are obtained. The results show that the buckledslates of the rod may be either supercritical or Subcritical. depending on the distancebetween the rod and the wires. Furthermore, it is found that -there exists a limit pointon the branch solution of the supercritical buckled State. This is distinctively differentfrom the buckled slate of the elastic compressive rods. 展开更多
关键词 MAGNETOELASTICITY BIFURCATION limit point numerical method straight rod carrying electric current
下载PDF
Evolution of melt convection in a liquid metal driven by a pulsed electric current
18
作者 Yanyi Xu Yunhu Zhang +4 位作者 Tianqing Zheng Yongyong Gong Changjiang Song Hongxing Zheng Qijie Zhai 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第8期424-432,共9页
Gain refinement in metal alloy can be achieved by applying an electric current pulse(ECP)in solidification process.Forced flow inside the melt has been proved to be a key role in grain refinement.In this paper,the flu... Gain refinement in metal alloy can be achieved by applying an electric current pulse(ECP)in solidification process.Forced flow inside the melt has been proved to be a key role in grain refinement.In this paper,the fluid flow inside Ga 20 wt%-In 12 wt%-Sn alloy induced by a damping sinusoidal ECP flowing through two parallel electrodes into the cylindrical melt was investigated by both experimental measurements and numerical simulations.Experimental results showed that a strong descending jet was induced beneath the bottom of electrodes under the application of ECP.Besides,it was found that flow intensity increases with the increase of amplitude,frequency,and pulse width,respectively.In order to unlock the formation mechanism of flow pattern and the relevance of flow intensity varied with electrical parameters,a three-dimensional numerical model under the application of ECP was established.Meanwhile,a comparative study was conducted by numerical simulations to reveal the distributions of electromagnetic fields and forced flow.Numerical results showed that the downward Lorentz force induced by ECP was concentrated beneath the bottom of electrodes.This downward Lorentz force induces a descending jet and provokes a global forced flow.According to numerical simulations,the evolution of flow intensity with electrical parameters under the application of ECP can be understood by the time averaged impulse of Lorentz force. 展开更多
关键词 pulsed electric current flow measurement numerical simulation MAGNETOHYDRODYNAMICS
下载PDF
Equivalent Resistance in Pulse Electric Current Sintering
19
作者 张东明 FUZheng-yi +1 位作者 YUANRun-zhang GUOJing-kun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第2期30-32,共3页
The sintering resistance for conductive TiB2 and non-conductive A12O3 as well as empty die during pulse current sintering were investigated in this paper. Equivalent resistances were measured by current and valtage du... The sintering resistance for conductive TiB2 and non-conductive A12O3 as well as empty die during pulse current sintering were investigated in this paper. Equivalent resistances were measured by current and valtage during sintering the conductive and non-conductive materials in the same conditions. It is found that the current paths for conductive are different from those for non-conductive materials. For non-conductive materials, sintering resistances are influenced by powder sizes and heating rates, which indicates that pulse current has some interaction with non-conductive powders. For conductive TiB2 , sintering resistances are influenced by heating rates and ball-milling time, which indicates the effect of powders activated by spark. 展开更多
关键词 RESISTANCE pulse electric current sintering INTERACTION
下载PDF
Soft measurement model on torque of alternating current electrical dynamometer including copper loss and iron loss
20
作者 ZHONG Ding-qing WANG Ai-lun HE Qian 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第8期2272-2280,共9页
Alternating current electrical dynamometer is a common device to measure the torque of engines, such as the gasoline engine. In order to solve the problems such as high cost, high energy consumption and complicated me... Alternating current electrical dynamometer is a common device to measure the torque of engines, such as the gasoline engine. In order to solve the problems such as high cost, high energy consumption and complicated measurement system which exists in the direct measurement on the torque of alternating current electrical dynamometer, copper loss and iron loss are taken as two key factors and a soft-sensing model on the torque of alternating current electrical dynamometer is established using the fuzzy least square support vector machine (FLS-SVM). Then, the FLS-SVM parameters such as penalty factor and kernel parameter are optimized by adaptive genetic algorithm, torque soft-sensing is investigated in the alternating current electrical dynamometer, as well as the energy feedback efficiency and energy consumption during the measurement phase of a gasoline engine loading continual test is obtained. The results show that the minimum soft-sensing error of torque is about 0.0018, and it fluctuates within a range from -0.3 to 0.3 N·m. FLS-SVM soft-sensing method can increase by 1.6% power generation feedback compared with direct measurement, and it can save 500 kJ fuel consumption in the gasoline engine loading continual test. Therefore, the estimation accuracy of the soft measurement model on the torque of alternating current electrical dynamometer including copper loss and iron loss is high and this indirect measurement method can be feasible to reduce production cost of the alternating current electrical dynamometer and energy consumption during the torque measurement phase of a gasoline engine, replacing the direct method of torque measurement. 展开更多
关键词 TORQUE fuzzy theory least square support vector machine alternating current electrical dynamometer
下载PDF
上一页 1 2 4 下一页 到第
使用帮助 返回顶部