查询词典 electromagnetic contact

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It introduces a kind of novel loading test system, based on the operation principle of damper. this loading system is operated by the driving motor. it realizes the loading, in that the damper has a negative drive force that puts on the motor. Based on the ordinary electromagnetic damper, the thesis presents a novel hybrid excitation electromagnetic damper which has adjustable work characteristic, analyses the working principle and structural feature of the electromagnetic damper, deduces the formulas to calculate the eddy current density through the Electromagnetic theory, analyses the distribution of the eddy current in the cotyloid rotor, and also studies the method of calculating the damp torque, establishes the mathematical model of the electromagnetic damper, analyses the relationship between the electromagnetic damper structural parameter and damp torque, researches the engineering design and analysis method of the electromagnetic damper, provides theory foundation for the design and analysis of the electromagnetic damper, contrives a hybrid excitation electromagnetic damper that satisfies the target request, designs a set of compound excitation electromagnetic damping loading control system whose control core is AT89C51 monolithic integrated circuit, analyses the electric circuit part, and carries on the experimental test to this set of electric circuits. Finally it debugs this electromagnetic damping loading system, this system satisfies the target request proposed.

论文提出了一个全新的加载测试系统种类，该加载系统是在阻尼器工作原理基础上，利用电动机拖动阻尼器运转，从而阻尼器产生一个与运动方向相反的阻尼力矩，该力矩作用在电动机上实现对电动机加载测试；同时，论文在一般电磁阻尼器基础上提出了一种新型的可调式复合励磁电磁阻尼器结构，该种阻尼器的工作特性在一定范围内可进行调节；论文分析了电磁阻尼器的工作原理和结构特点，运用电磁场理论分析推导了电磁阻尼器的涡电流密度公式，分析了涡电流在转子杯内的分布图，并对阻尼力矩计算方法进行了研究，建立了电磁阻尼器的数学模型，分析了电磁阻尼器结构参数和阻尼力矩之间的关系，对电磁阻尼器的设计和分析方法进行了研究，为电磁阻尼器的工程设计建立了理论基础；设计了满足技术指标要求的复合励磁电磁阻尼器和一套以AT89C51单片机为控制核心的复合励磁电磁阻尼加载控制系统，对该控制系统硬件电路各部分进行了分析和设计，对软件进行了设计，并对控制电路进行了试验调试，该系统满足所提出的加载指标要求。

Compared with the initial value problems of scalar conservation laws with smooth flux function, the global weak entropy solutions for the initial-boundary value problems of scalar conservation laws with weak discontinuous flux function include the following new interaction types: a rarefaction wave collides with the boundary and is absorbed compltetely or partially by the boundary; a rarefaction wave collides with the boundary and the boundary will reflect a contact or non-contact shock wave; a contact or non-contact shock wave collides with the boundary and is absorbed by the boundary; a contact or non-contact shock wave collides with the boundary and a new non-contact shock will rebound from the boundary simultaneously or later.

与具有光滑流函数的单个守恒律的初始值问题相比，具有弱间断流函数的单个守恒律初边值问题的整体弱熵解中包括下列新的相互作用类型：稀疏波碰到边界并被边界部分或全部吸收；稀疏波与边界相撞，边界反射出一个接触或非接触激波；接触或非接触激波碰到边界并被边界吸收；接触或非接触激波与边界相撞，边界同时或稍后反射出一个新的非接触激波。

In addition, total wheel/rail contact calculation with divided rail outline method are raised. Under the condition of considering the displacement, bouncing, yaw, roll of wheelsets and displacement, bouncing, roll of rails, minimum gap between rail and wheel were calculated by the trochoid method and divided rail outline method, we can easily judge totally real contact states of the wheel/rail such as normal one-point contact, nonnormal one-point contact, two-point contact and wheel complete lift. Wheel/rail normal forces in the two contact point are respectively calculated by nonlinear Hertz contact theory, and then, result of simulation more close to reality on actual track.

另外，提出了轨廓分区法全面计算轮轨接触状态法，在考虑轮对的横移、浮沉、摇头、侧滚和左右钢轨的横移、浮沉、侧滚的条件下，可全面地分别计算左右侧轨顶和轨侧区域与车轮的最小轮轨间隙量，以此来判断轮轨的真实接触状态：正常的一点接触、非正常的一点接触、两点接触和车轮完全悬浮，并根据非线性赫兹接触理论分别求得两接触点处的轮轨法向力，从而使仿真结果更接近于车辆在实际线路上的运行状态。

In this thesis, the research and the development of electromagnetic safety materials have been reviewed. On the basis of the theory of the electromagnetic field, the electromagnetic wave and the interaction between the materials and the electromagnetic wave, several kinds of new composites have been prepared by adopting new methods, electroless plating and a kind of method of Fe replacement chemical aggradation, and studied by advanced measuring and analyzing components.

对电磁防护材料的国内外研究现状进行了研究，从电磁场与电磁波理论及电磁波与材料之间的交互作用出发，采用新的思路和方法，采用化学镀和一种Fe置换化学沉积法制备了新型的电磁防护材料，并采用先进的测试分析手段研究了材料在2～18GHz电磁波频段范围的电磁波吸收性能和在100KHz～1.5GHz电磁波频段范围的电磁波屏蔽性能。

This thesis contributed to the comprehensive study of the Finite-Difference Time-Domain method and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies. The work includes mainly three parts: the study on the performance of PML absorbing boundary condition applied to pseudo low frequency electromagnetic problems; the validation of the FDTD method with PML absorbing boundary conditions and the corresponding computer software based on the numerical study of the electromagnetic field of an electric dipole antenna, and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies; the development of an improved alternating direction implicit finite-difference time-domain method.

在综合前人工作基础上，本文对时域有限差分法及其在开关电源辐射电磁场数值计算中的应用进行了系统的分析和研究，其核心内容包括：伪低频电磁场数值计算中PML吸收边界条件性能的研究；基于基准问题—电偶极子天线三维辐射电磁场，验证了本文构造的基于PML吸收边界条件的三维FDTD法及其计算软件，并应用于高频开关电源辐射电磁场的数值分析；提出了一种改进的交替方向隐格式时域有限差分法。

The author points out: if lots of the conflicts of philosophical foundation the 20th century's quantum mechanics faced with, well-known to everybody, should be logically attributed to the confusions of the some fundamental concepts in the classical electromagnetic field theory, the series of logic inconsistencies implied in the classical electromagnetic theory and the forms of difficulties the modern computational electromagnetism encounters while solving time-varying electromagnetic field should be also logically attributed to an anomalous fact that series of fundamental mathematical propositions relating with bispinor differential operator, which naturally appears in the formal expression about dynamic electromagnetic field, have not be solved really while the related complete mathematic physical models or well posed boundary value problems have not been built.

著者指出：如果说20世纪的量子力学之所以面对哲学基础众所周知的矛盾，在逻辑上最终不能不归咎于经典电磁场理论体系的一些基本概念并没有真正得到澄清的话，那么，经典电磁场理论体系隐含的众多逻辑不自洽问题与目前计算动态电磁场所面对的困境，则必须逻辑地归咎于与双旋度微分算子相关的一系列基本数学命题并没有解决，而相关的恰当数学物理模型至今没有真正建立起来的缘故。

These reviews include three search fields: the equipment of electromagnetic riveting,the process of electromagnetic riveting and the deformation mechanism of adiabatic shear : the low voltage electromagnetic riveter is in the works and the simulation of electromagnetic riveting will be more and more importance in the analysis.

从原理出发，对国内外电磁铆接设备、工艺及绝热剪切变形机理的研究进行了分析比较，指出电磁铆接设备将走低电压发展的道路，数值模拟将在今后的研究中发挥越来越重要的作用，最后对该领域的发展趋势提出自己的观点。

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。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。