大型消磁站设计中消磁兼容性分析

针对大型消磁站的消磁兼容性，基于通电线圈磁场计算，分析大型消磁站补偿线圈安匝组合，提出磁探头的布局问题，为大型消磁站消磁线圈的计算设计方案提供了参考依据．     

大型舰船分区消磁理论研究

针对以往舰船消磁系统采用单一消磁电流回路所带来的诸多弊端，对某型舰首次提出分区消磁的思想，在理论分析计算的基础上，进行了模型试验研究，所得有关数据和结论对于舰船消耗磁系统设计，建造及调整等都有重要的参考价值。     

聚变反应堆校正场结构优化及性能分析

针对核聚变反应堆校正场线圈的结构进行了优化,确定了满足物理和工程装配的线圈结构。针对校正场线圈进行电磁分析,并得到线圈磁场和电磁力分布。根据广义胡克定律,利用有限元方法将线圈绕组材料属性等效,以简化结构计算模型。通过建立结构分析模型,计算电磁力载荷下的校正场线圈强度,确定了线圈盒厚度,支撑位置及支撑数目。最后为保证校正场线圈始终处于低温工作环境,根据校正场线圈结构和热负载,提出并确定线圈液氦冷却管方案。     

舰船动态消磁方法初步研究

传统消磁方法存在舰船系留时间长、机动性和隐蔽性差等弊端，舰船动态消磁法是解决这些弊端的有效手段。其基本思想是：使舰船慢速通过由平铺在海底的组合式消磁线圈所产生的磁场空间，从而达到在运动中消磁的目的。模型实验证明，动态消磁法能够在很短的时间内使舰船磁场得到明显的改善。     

基于Maxwell 3D的汽车空调压缩机电磁离合器电磁力仿真研究

以SEBX15汽车空调压缩机为设计原型,应用Ansoft Maxwell对基于三维静磁场的汽车空调压缩机电磁离合器的电磁力进行仿真计算,旨在研究线圈安匝数、气隙、吸盘隔磁槽槽宽、间距和内圈半径等几个因素对电磁离合器所产生的电磁力的影响,为汽车空调压缩机电磁离合器的设计和选配工作提供理论依据。     

螺旋焊管剩磁的研究与运用

结合剩磁理论对螺旋焊管生产及施工中出现的剩磁现场做出一定的研究,并探讨、拟定了切实、可靠的消磁方法.在实际工作中,设计并制造了消磁线圈,应用于工地与生产车间的消磁工作,取得了令人满意的效果.     

大型汽轮发电机定子绕组端部模态仿真与试验研究

大型汽轮发电机运行时会受到端部电磁力的作用,当电磁力的频率或者二倍工频与定子绕组端部的固有频率接近时,容易发生较大的振动,产生安全隐患,故需要对定子绕组端部振动情况进行研究。本文建立了定子端部准确的三维模型;为方便计算,对有限元模型进行了简化,进行了模态分析,获得了前两阶的振型;采用试验法进行模态测试,并将仿真计算结果与试验结果进行对比,并进行了误差分析,二者误差在合理范围内,从而验证了本文仿真的合理性,为汽轮发电机的设计和安全运行提供依据。     

励磁线圈磁场约束金属射流变形的作用机理研究

为探究励磁线圈磁场对金属射流变形的作用机理,提出了励磁线圈脉冲磁场作用下,金属射流中感应电流密度、磁感应强度及电磁力密度分布的理论模型,建立了励磁线圈约束金属射流的有限元模型,进行了电磁-温度-结构多物理场耦合分析,最后进行了试验验证。结果表明,励磁线圈磁场能够对金属射流进行有效约束,电磁力做功和欧姆热效应的累积,引起金属射流发生有效变形,使金属射流整体更加均匀,进而可延缓金属射流劲缩部分断裂的过程,增强破甲弹对目标的侵彻穿深能力。     

模糊-专家控制在智能消磁中的应用研究

综合消磁是处理舰船固定磁性的重要手段，长期以来，由于综合消磁工艺的复杂性，使得这项工作在很大程度上依赖人工，实现消磁自动化，就是要将工作人员从繁重的脑体劳动中解放出来，提高工作效率，目前的新型消磁站已经实现了数据采集，统计自动化，不仅基本免除了工作人员的体力劳动，也从一定程度上减轻了消磁技师的脑力劳动，然而由于需要人工参与决策，综合消磁的效果和效率仍然十分依赖于人的因素，所以，实现综合消磁工作的完全自动化，补偿电流值组合的智能化决策是关键问题，本文在分析以前所做工作的基础上，运用模糊控制理论构造模糊-专家控制器，替代人工决策过程以实现自动化消磁。     

强磁体结构的磁场和应力同步分析方法

在强磁体结构中，电磁力是主要载荷。由于磁场计算和结构分析属不同学科，这两部分研究一般都是孤立地、分别进行的。本文指出了这样研究的弊病，提出了磁场和应力同步分析的方法。并以中国ＨＬ－１托卡马克磁体为例，采用有限元应力分析和三维磁场计算同步进行的方法，得到了托卡马克环向场线圈的磁体力、应力和变形分布。     

求解舰船消磁系统S矩阵的一种新方法

利用舰船感应干扰系数矩阵和消磁系统传感器检查绕组电磁常数定义了舰船消磁系统模拟特征矩阵——S矩阵，进一步阐述了用S矩阵模拟产生舰船消磁系统在任意地点和任意姿态下的真实消磁电流的原理方法，在定义消磁系统电流状态矩阵基础上，推导了S矩阵各元素新的数学表达式，从而得到S矩阵一种新的求解和测量方法。     

Novel Electromagnetic Actuation Scheme for Multiaxis Nanopositioning

In this paper, we present a novel electromagnetic actuation scheme for nanoscale positioning with a six-axis magnetic-levitation (Maglev) stage, whose position resolution is 3 nm over an extended travel range of 5$,times,$5 mm in the$x$-$y$plane. We describe the conceptualization of the actuation scheme, calculation of forces, and their experimental verification in detail. This actuation scheme enables the application of forces in two perpendicular directions on a moving permanent magnet using two stationary current-carrying coils. The magnetic flux generated by the magnet is shared by the two coils, one right below and another on one side of the magnet. The magnitudes and directions of the currents in the coils govern the forces acting on the magnet, following the Lorentz-force law. We analyzed and calculated the electromagnetic forces on the moving magnet over a large travel range. We used feedback linearization to eliminate the force-gap nonlinearity in actuation. The new actuation scheme makes the Maglev stage very simple to manufacture and assemble. Also, there is no mechanical constraint on the single moving platen to remove it from the assembly. There are only three NdFeB magnets used to generate the actuation forces in all six axes. This reduces the moving-part mass significantly, which leads to less power consumption and heat generation in the entire Maglev stage. We present experimental results to demonstrate the payload and precision-positioning capabilities of the Maglev nanopositioner under abruptly and continuously varying loads. The potential applications of this Maglev nanopositioner include microfabrication and assembly, semiconductor manufacturing, nanoscale profiling, and nanoindentation.     

从探头阵列到标准测量点的磁场值转换

针对目前在消磁站对舰船进行磁场测量时，探头阵列所测磁场值不是舰船标准测量点的磁场值这一情况，讨论依据探头阵列（基准测量点）测量出来的磁场值，采用二次二雏插值算法计算舰船标准测量点上的磁场值．实验结果表明，该方法计算精度高，具有较高的应用价值．     

Rotating shutters: a mechanical way of flattening gaussian beam profiles in time average

A mechanical method of flattening the Gaussian intensity distribution of laser beams in time average is presented. Specially shaped rotating shutters are the key feature of this method, which has been applied to achieve homogeneous submicrometer patterning of macroscopically large samples by laser interference exposure. This method represents a simple yet useful alternative to applying beam broadening or degaussing plates (apodizing filters).     

DEALS: a demountable superconducting magnet system for fusion reactors

A new type of superconducting magnet system (DEALS) for large fusion reactors is described. Instead of winding large planar or multi-axis coils, as has been previously proposed in fusion reactor designs, the demountable superconducting coils would be made by joining together several prefabricated conductor sections. Conductor types, fabrication processes, and joining schemes are described. The magnet sections would be made at a central factory and shipped to the reactor site for assembly.The magnetic forces on the conductors would be transmitted to an external room temperature support structure via low thermal conductivity bearing blocks. This reduces conductor tensile stresses to very low levels. Differential and mechanical thermal movements between the magnet coil and the external support structure would be accommodated by the use of moveable joints between magnet sections. These pressure type contact joints carry current during magnet operation, and do not carry tensile loads.Finite element analyses on the magnet and its support structure are presented together with analyses of magnet cooling requirements. Results of experiments on small movable pressure type joints at liquid helium temperatures are described.These indicate that adequately low joint losses should be achievable in large magnet systems. Current carrying capcity is not affected by relative motion, and friction coefficients are reaonable. Based on these results and the analyses, the DEALS concept appears feasible for fusion magnet systems.     

Magnetic attitude actuation for passive satellites

The orientation of a passive communications satellite with respect to the earth can be adjusted by using an electromagnetic actuator which is rigidly mounted on the structure of the satellite. The actuator consists of three mutually-orthogonal air-cored coils on the skin of the satellite. If any one of the coils is excited by current, the magnetic field generated by it tends to rotate the satellite until the generated field and the terrestrial magnetic field are aligned. The activation of the coils also produces various undesirable forces which must be supported by the satellite structure. If the actuator is mounted on an ultra-thin structure, such as the Echo II Satellite balloon, these forces can have damaging effects. In this paper equations are derived for the adjusting torque and for the undesirable forces. The conclusion reached is that the compressive force upon the coil loops caused by the terrestrial field poses the most serious danger to the satellite structure.     

Design and analysis of passive homopolar flux bearings

Electrodynamic Maglev systems (EDSs) and passive magnetic bearings (PMBs) generate magnetic forces by induction through the movement of permanent or superconducting magnets past conducting coils. Nearly all EDSs and PMBs use a flux coil exposed to changing magnetic fields in the rotation or travel direction. An unusual variant eliminates discrete coils by using field structures that do not vary in the direction of rotation. We discuss the design and analysis of this homopolar variant in this paper. We believe that this is the first combined passive damper/axial support bearing, and we present here the first generalized solution of its governing equations. Actuated brushes during motoring and generating simplify energy exchange when the device is used for flywheel energy storage.     

Das Vakuumsystem der TOSKA-Spulentestanlage

Plasma confinement in fusion reactors requires large magnetic fields which are generated by superconducting solenoids. The coils of the future reactor ITER have a size of some 18 m × 10 m. Their construction is a technical challenge: the body of the coil suffers from large mechanical forces, originating from the magnetic field, as well as substantial thermal stress resulting from the cooling to 4.2 K. Nevertheless, the coils are required to be absolutely vacuum tight since no loss of the refrigerant helium is permissible. In the Research Center Karlsruhe (FZK) prototype coils are tested in operation under high vacuum conditions. The test chamber has a volume of 170 m³. It is pumped by an oil diffusion pump with a nominal pumping speed of 16 000 l/s. As fore and roughing pumps, a combination of Roots and rotating vane pump are employed. The available effective pumping speed of the oil diffusion pump has been measured by two different procedures: via the resulting equilibrium pressure in case of an injected stationary gas flow, and via the time-dependent decrease of pressure during pump-down. The measurements give an effective pumping speed of some 2 000 l/s. The main reason for the small pumping speed (as compared to the nominal value) is the small conductances of the inserted vacuum components and baffles. When the heating power of the oil diffusion pump is reduced to one half, the pumping speed decreases only slightly, whereas the maximum throughput decreases to one third.     

Ten years of cryomagnetic W7-X test facility construction and operation

The construction, commissioning, and operation phases of the W7-X cryomagnetic test facility in CEA Saclay lasted ten years. The large diversity of equipments called, specialties involved and problems solved attest the expertise that was required to operate the test facility and test the coils. Nearly one hundred cryogenic tests were performed on the seventy W7-X coils, at a rate always increasing, using two cryostats each holding two coils.This paper presents the test facility and its operation first, the cryogenic difficulties that were confronted with their solutions, the electro-magnetic difficulties encountered along with corrective actions, and finally the instrumentation and data acquisition aspects.     

发电机复合材料护环的强度刚度分析和铺层设计

本文考虑了横向剪切变形的影响,采用“退化”的三维等参单元,建立承受非均匀表面力、离心体积力和热应力联合作用的一般层合各向异性壳的有限元公式和程序,并用它对25MW发电机玻璃纲护环进行刚度、强度分析。提出铺层缠绕的优化设计方案。