查询词典 electromagnetic induction

Numerical simulations were done for a bistable latch valve of the system by FLUENT, and three groups of datum for different fluids were obtained with the same effective exit sectional area. Besides, a static mathematic model for the electromagnetic valve was established based on the obtained datum. Secondly, the motion of the valve spool was realized by UDF file in FLUENT. Three kinds of motions, uniform, acceleration and motion driven by the coupling effect of the liquid resistance and the electromagnetic force, were calculated and compared. The dynamic characteristic of the electromagnetic valve was obtained by analyzing the relationship of the mass flow rate of the inside flow field of the electromagnetic valve, the change of the drop pressure of the passageway of the valve, and motion time.

并针对系统中的某双稳态电磁阀，使用商用CFD软件FLUENT对其进行内部流场的数值模拟，通过使用不同流体介质，不改变阀门有效出口截面积的情况下，分析得到的三组数据，建立了该电磁阀的静态数学模型；通过编写UDF文件，实现对阀芯运动方程的控制，在阀门做由闭合到开启、开启到闭合运动时，控制阀芯分别做匀速运动、匀加速运动以及阀芯受到液体阻力与电磁力作用力的耦合力的运动，分析了三种工况下电磁阀内部流场质量流率和阀门出口入口压降的变化以及运动时间，从而得到该电磁阀的动态特性。

Other transmission products 18, Tsubakimoto JAPAN: transmission chain, cable protective cover, slow motor, coupling, Tensioner kits, torque limiter, overrunning clutch, electric putt, buffers; 19, JAPAN Concord produced by: AC electric drum, DC roller; 20, Japan Concord Industry: universal coupling; 21,: The United States aerogenes fetal-type brake clutch, water-cooled oil-cooling brake clutch; 22, Asahi Seiko: pneumatic brakes, pneumatic clutches, fluid couplings, bearings with Block 23, shinko JAPAN: electromagnetic clutches, electromagnetic brakes, vibration equipment; 24, kokura JAPAN : electromagnetic clutches, electromagnetic brakes; 25, Japan Muto motor: a variety of fans, dust collection machines; 26, Showa Japan: Precision rotary joint, steam joints, hydraulic, coolant dedicated joint; 27, Seiko Kobayashi JAPAN: Block Bearing Belt; 28, Taiwan·×: indexing device; 29, Seiko Epson: Precision multi-joint manipulator.

其它传动系列产品18、日本椿本：传动链条，电缆保护套，减速电机，联轴器，涨紧套，扭力限制器，超越离合器，电动推杆，缓冲器；19、日本协和制作所：AC电动滚筒，DC电动滚筒；20、日本协和工业：万向联轴节；21、：美国产气胎式刹车离合器，水冷油冷式刹车离合器； 22、日本旭精工：气动刹车，气动离合器，液力偶合器，带座轴承23、日本神钢：电磁离合器，电磁刹车，振动设备；24、日本小仓：电磁离合器，电磁刹车；25、日本武藤电机：各种风机，集尘机；26、日本昭和：精密旋转接头、蒸汽接头、液压、冷却剂专用接头；27、日本小林精工：带座轴承；28、台湾谭子：分度装置；29、爱普生精工：多关节精密机械手。

Based on the electromagnetic theory, analyze the character of electromagnetic force using two linear electromagnetic stirrers which were designed by our department. Investigate the rule of electromagnetic force and how the different parameter of casting and stirring influnce the solidification structure.

本文采用理论分析与实验研究相结合的方法，在实验室条件下，采用本系最新自行研制的行波磁场搅拌器对在行波磁场电磁搅拌作用下钢液内的电磁力特性、各种不同浇铸工艺参数以及搅拌参数对铸坯凝固组织的作用规律，进行了深入的研究。

They include all kinds of super mini sealed DC electromagnetic relay, sealed electromagnetic relay, sensitive electromagnetic relay, mini sealed electromagnetic relay, super mini high-power relay, super mini sealed hold relay, coaxial relay, super mini sealed relay, mini sealed temperature relay, high temperature relay, heat protector, priming system safety protector, separation control overload switch, wind speed relay, time relay, sealed switch, program controller and protector for over loading, etc., which are used widely in aviation, aerospace, electronic communication, home appliance, etc.

各类超小型密封直流电磁继电器，密封电磁继电器，灵敏电磁继电器，微型密封电磁继电器，超小型大功率继电器，超小密封保持继电器，同轴继电器，超小型密封继电器，微型密封温度继电器，高温温度继电器，热保护器，火工品安全保护器，分离控制过载开关，风速继电器，时间继电器，风器，密封断路器，程序控制器，过载保护器等广泛用于航空，航天，电子通讯，家用电器等领域，其产品远销欧洲。

On the basis of different frequences, three electromagnetic wave logging methods widely used are Electromagnetic Propagated Resistivity Logging with several mega-hertz operation frequency, Ultrahigh-frequency Electromagnetic Wave Logging with above 200 mega-hertz operation frequency and High-frequency Electromagnetic Wave Logging with some dozens of megaherz operation frequency.

根据所选频率的不同，电磁波测井有三类：几兆赫兹电磁波传播电阻率测井、200 MHz以上的超高频电磁波传播测井、源频率为几十兆赫的高频电磁波测井。

On the basis of different behaviors of alternative electromagnetic field for induction and electromagnetic shaping, the process of dual frequency electromagnetic shaping of molten metal was firstly presented.

从固态金属感应加热熔化和液态金属电磁成形两个角度出发，讨论了金属熔体双频电磁成形中的频率选择，物理量的分布以及两种双频电磁成形的试验过程。

Firstly, according to electromagnetic field theory, the 2-dimensional (2-D) mathematical model of a three phase squirrel-cage Y802-2 induction motor is developed. Then general equations can be deduced from finite element discrete and functional analysis. The motor's 2D solving region of electromagnetic field is given based on the boundary conditions and assumption conditions of the squirrel-cage induction motor. Through finite element mothod and inner–outer convergence method, magnetic field distributions and magnetic forces of bars can be calculated in following rotor conditions: health rotor, one single broken bar, two adjacent broken bars, two broken bars with one good interval, two broken bars with two good interval and four adjacent broken bars.

本文首先根据电磁场理论建立Y802-2型三相笼型感应电动机二维电磁场的数学模型，并对其进行了有限元离散以及泛函分析，推导出总体方程；在基本假设和边界条件基础上，给出笼型感应电动机二维电磁场的求解区域，然后应用有限元并结合内外双收敛方法，对样机稳态运行进行数值计算，得出电机在转子完好、一根导条断裂、连续两根导条断裂、间隔一根两根导条断裂、间隔两根两根导条断裂及连续四根导条断裂六种情况下的磁场分布和导条所受电磁力的变化情况。

The electromagnetic responses of the finite size induction coils were evaluated, and the effects of the borehole mud ,casing pipe and radius of the induction coils were analyzed, the sensitivity of the electromagnetic response to the formation resistivity was checked against the crosshole measurements.

分析了金属套管井中有限尺寸线圈的电磁响应特征，讨论了井眼泥浆参数﹑套管参数和不同线圈尺寸对电磁测井响应的影响，考察了金属套管中电磁测井对地层电阻率变化的灵敏度。

All in all, the opinion of this article is: General Lorentz magnetic force is the physical essence of electromagnetic induction, while Faraday's law is just the phenomenon of electromagnetic induction.

总之，本文的观点是：广义洛伦兹磁力是电磁感应的物理本质，而法拉第定律只是电磁感应的现象。

That is to say, during the starting process of induction motor, hold-off angle of current has gradually decreased from initial value to zero. The method can always make the displacement angle less than thyristor's firing angle. So the voltage of the induction motor won't oscillate. Therefore, the oscillation of current, electromagnetic and speed can be eliminated during the soft-starting process of induction motor. This paper verifies the correctness of the method by simulation at first.

根据上述原因，本文提出了采用关断角控制的新型控制策略，这种控制策略是使电动机在起动过程中的电流关断角由某一初始值逐渐减小到零，利用该方法可以使感应电动机起动过程中的续流角始终小于晶闸管的触发角，这样续流角的变化就不会引起电动机端电压的振荡，因而就从根本上消除了感应电动机软起动过程中的振荡现象。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。