Determination of a Compensation Current for a Non-measurable Component by Measuring Geomagnetic Field Components with a Proton Magnetometer

A method for determining a compensation current for the magnetic field H-component by measuring the Z-component by means of the nuclear magnetic resonance method is described. The current is applied via serially connected windings of the Helmholtz coil system, which guarantees equal induction magnitudes before and after the field switching-on. The windings are then connected so that a half-value current flows via them to compensate for the perpendicular component of the field. Similar circuits are presented for three-coil compensation and Brownback coil systems.     

厚壁筒型泵体减重优化设计

泵的结构设计时应满足水压及工作条件下的强度和刚度条件。但为了节省材料、降低成本,提高市场竞争力,泵体尺寸不能设计得过大。本文提出了厚筒型泵的优化设计方法。优化设计的目标是减轻泵的质量,约束条件是泵的强度,优化设计变量是泵壳及泵盖厚度。将Isight优化软件与ANSYS结构分析软件集成起来,基于壳单元模型开展了减重优化设计。针对初始优化方案,使用实体模型校核其在工作条件下的强度,最终得到可行的减重优化设计方案。     

Reconstructing the Topography of Surface Defects of Ferromagnets in a Normal Magnetization Field

Russian Journal of Nondestructive Testing - The method of reconstructing the topography of defects in a ferromagnet in a normal magnetization field is considered. It is shown that with such...     

一种齿轮箱悬挂装置的优化设计

随着载荷的增大,现有齿轮箱悬挂装置中的主要承载金属部件的极限强度和疲劳强度安全系数越来越小,其配套弹性支撑的疲劳寿命安全系数也越来越低.本文对齿轮箱悬挂装置的整体结构进行了优化设计,对现有结构和优化结构的整体强度进行了极限工况和疲劳工况仿真分析对比,对现有结构和优化结构的主要金属部件进行了疲劳寿命预测对比,对现有结构和...     

The Model of a Surface Flaw and the Calculation of the Topography of Its Magnetic Field for Normal Magnetization by an Alternating Field. A Quasi-Stationary Case

A surface flaw model is proposed. The model describes the magnetic field topography H _d for normal magnetization by an alternating field H of frequency . It is shown that H _d can be presented as two cofactors: one cofactor describes a dependence of the topography on coordinates x, z and parameters of a flaw (depth h, opening width 2b), and another cofactor describes its dependence on the electrophysical properties of a tested material containing the surface flaw (specific conductivity , and the relative magnetic susceptibility ). Transition from the magnetostatic field of a flaw = 0 to a quasi-stationary field for magnetization under an alternating field H _0s of frequency is carried out using the model proposed for the magnetic field of a surface flaw under normal magnetization.     

小型液动瓦斯吹排装置的优化研究

为解决煤矿上隅角瓦斯吹排装置中液压马达滑靴外周的过度磨损及风机的效率较低、风量不足的状况,在滑靴底面的环状带内开设规则的沿径向收敛的凹坑对马达滑靴进行结构优化,通过计算流体动力学数值试验改进了叶轮、导叶、整流罩、轮毂和整流体。结果表明:新的设计改善了液压马达滑靴外周的过度磨损状况,总磨损量降低了28.77%;风机全压效率由71.3%提高到了76.6%。     

Model of a Surface Flaw and Calculation of Topography of Its Magnetic Field for Tangential Magnetization by Alternating Magnetic Fields. Quasi-Stationary Case

A model of a surface flaw is proposed. The model describes topography of the magnetic field for tangential magnetization by an alternating magnetic field H at a frequency . It is shown that H can be represented in the form of two multipliers: one describes the dependence on the (X, Z) coordinates and the flaw parameters (the depth h and the opening width 2b) and the other describes the dependence on the electrophysical properties of the tested material in which the surface flaw is located (the specific conductivity and the relative magnetic permeability ). The computational model proposed makes it possible to describe the magnetic field topography ( = 0) reducing it to the quasi-stationary case and extend representations on the formation of magnetic fields induced by surface flaws with allowance of the magnetization frequency . The data on processing the experimental dependences in accordance with the proposed computational formulas give satisfactory results which confirm the validity of the computational model proposed in the study.     

Calculating the Strength of Magnetic Field from a Homogeneous Cylinder of Finite Dimensions Placed in an Arbitrary External Field

Russian Journal of Nondestructive Testing - An algorithm is presented for finding the strength of the resulting magnetic field inside and outside a homogeneous cylinder of finite dimensions placed...     

基于PCI总线的含电子元件安全电路试验装置的研究设计

对含电子元件安全电路的试验要求进行了分析,研究设计了一套基于PCI总线的试验装置,该装置能完成GB7588-2003对含电子元件安全电路所要求的所有试验,对整个试验过程进行监控和分析,控制试验的进行,并对样品合格与否做出正确判断。     

废油再生装置冷却设备涡旋压缩机结构参数优化

涡旋压缩机结构参数直接影响到润滑油分子蒸馏再生装备的效率。以基于泛函通用涡旋型线构成的变壁厚涡旋盘为研究对象,建立了以能效比为目标函数的结构参数优化模型。分析了涡旋压缩机压缩过程中由排气容积变化引起的热能变化及能效比变化。以能效比为目标函数,以涡旋盘结构参数及型线方程为变量,利用遗传算法得到能效比最优化时的变量。给出具体算例,并与等壁厚的涡旋型线构成的压缩机进行性能比较,得知前者更优。基于泛函的通用涡旋型线为涡旋压缩机型线设计拓展了思路。     

Calculation of the Spectral Function of Magnetic Field due to a Surface Flaw and Reconstruction of Magnetic Field due to a Flaw of Corresponding Dimensions in a Ferromagnetic Plate

The spectral function of the magnetic field generated by a flaw in a ferromagnetic plate has been calculated, and feasibility of reconstructing magnetic field due to a flaw on the other side of the plate has been demonstrated.     

Inspection of the Strength Characteristics and Heat-Treatment Quality of Ferromagnetic Articles Based on Parameters of the Residual-Magnetization Hysteresis Loop upon Their Local Magnetization and Magnetization Reversal in a Pulsed Magnetic Field with a Variable Amplitude: II. Steel 60C2

Effects of the tempering temperature on specimens’ hardness and on the anomalous-hysteresis loop’s and the recovery curves’ parameters for residual magnetization are experimentally studied. Test specimens made of steel 60C2 intended for laminated springs were subject to local magnetization and magnetization reversal by a pulsed magnetic field with a variable amplitude. Parameters enabling tests of the hardness of steel within three ranges of the tempering-temperature variation (0–300, 300–600, and 0–600°C) are determined.__________Translated from Defektoskopiya, Vol. 41, No. 5, 2005, pp. 14–23.Original Russian Text Copyright © 2005 by Matyuk, Mel’gui, Pinchukov, Lyubarets.     

现场智能测控仪表软件组件集成技术的研究

本文以“SHCAN2000型现场总线控制系统”的开发为背景,探讨了现场智能测控仪表软件系统的体系结构、组态原理、扩充方法等软件组件集成技术的重要内容。本软件组件集成技术已在调节器、巡检仪、积算器、PLC等20种现场智能仪器仪表产品开发中获得了成功的应用。     

Inspection of the Strength Characteristics and Heat-Treatment Quality of Ferromagnetic Articles Based on Parameters of the Residual-Magnetization Hysteresis Loop upon Their Local Magnetization and Magnetization Reversal in a Pulsed Magnetic Field with a Variable Amplitude: I. Parameters of the Hysteresis Loop

Results of an experimental study of the anomalous behavior of the residual-magnetization hysteresis of ferromagnetic articles that, under local magnetization and magnetization reversal in a pulsed magnetic field with a variable amplitude, were subjected to heat treatment under different conditions are reported. Parameters of the hysteresis and their dependence on the magnetization and magnetization-reversal conditions, as well as on the magnetic properties of a material, are considered.__________Translated from Defektoskopiya, Vol. 41, No. 5, 2005, pp. 3–13.Original Russian Text Copyright © 2005 by Matyuk, Mel’gui, Pinchukov, Lyubarets.All papers in this issue are devoted to the 100th anniversary of the birth of the late M.N. Mikheev, corresponding member of the Russian Academy of Sciences and one of the founders of magnetic structural analysis.     

圆柱内壁件下压装配机械手结构实现及弹簧参数优选

根据特定产品生产工艺要求,设计了一种用于圆柱内壁件作业的内撑式抓取与下压装配机械手。该机械手在手指系统与筒状手掌之间采用弹性连接。在高速作业过程中,这类弹性连接形成手指系统的残留振动。在对机械手结构设计思想与结构介绍的基础上,对机械手系统采用Adams运动仿真,分析了弹簧系统参数对手指系统的残留振动的影响,并对影响机械手振动特性的关键参数——连接弹簧的参数进行了优化选择。实际机械手的运行结果表明,该机械手结构与弹性参数的选择可以很好地满足特定对象的作业要求。     

One Approach to the Numerical Solution of the Basic Equation of Magnetostatics for a Finite Cylinder in an Arbitrary External Field

Russian Journal of Nondestructive Testing - We consider the direct problem of magnetostatics of calculating the strength of the resulting magnetic field of a uniform cylinder of finite dimensions...     

直筒型导叶直流式三相旋流器气相流场的试验研究与数值模拟

采用FLUENT软件对三相旋流器的内部气相流场进行了数值模拟。分别选用标准k-ε模型、RNG k-ε模型及RSM模型进行了模拟计算,并将模拟计算结果与实验值进行了对比。结果表明,采用RSM模型得到的模拟结果同实验值吻合良好,可以采用该模型对三相旋流器的内部气相流场进行预测。     

油田抽油机用带传动弹性张紧装置的技术研究

提出了一种油田游梁式抽油机(俗称"磕头机")带传动系统中带使用的弹性张紧装置,介绍了现在使用的张紧装置的结构形式和存在的问题,分析了弹性张紧装置的技术研究和产品特点。     

基于Fluent的小型人工气候室出风口风场的模拟及优化

为了使小型人工气候室内的风场更加均匀,采用Fluent软件对13种不同的出风口结构进行风场模拟和结果比较,得出最佳出风口结构。运用MRF多重参考系法建立风扇的动域产生不均匀风场,不均匀风场经过出风口得到优化。对模拟结果的假人室横截面进行截取获得该截面风速分布矢量图,计算截面速度的CV值比较分析。结果表明:导流板加圆形出风格栅的出风口结构对气候室内的风场均匀性有很大提高,当圆形格栅的直径为30 mm,宽度为70 mm时出风口的风场均匀性优于其它方案。     

Nodal Lines of Normal Components of Scattered Fields on Surfaces of a Flawless Steel Pipe Slightly Bent in a Weak External Magnetic Field

A component of scattered magnetic field normal to the surface of a awless steel pipe has been calculated taking account of the elastic stress distribution in the bent pipe. Nodal lines of the resulting scattered field induced by the weak magnetic field components, both longitudinal and transverse with respect to the pipe axis, have been obtained.