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...     

混杂样品各组分顺次电离装置的研制与应用

本工作研发了能与质谱联用的混杂样品顺次电离装置,用于在分子层次获取样品中不同组分的分子结构、丰度以及空间分布等信息。本装置设计了包括试剂选择与混配、形貌显微分析、微量样品电解与电离等多个模块。在微型反应池内,不同溶剂选择性地溶出样品中物理化学性质各异的组分,在时序触发与智能控制模块的调控下实现混杂样品的顺次电离与质谱分析。利用该装置实现了对合金、矿石、生物样品中有机及无机组分的顺次检测,获得了丰富的组分信息,在材料、能源、地球、生命等科学领域具有良好的应用前景。     

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.     

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...     

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%。     

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。     

离心场下电液伺服振动装置液压系统的关键技术

在分析离心场下电液伺服振动装置运行工况的基础上,提出了电液伺服振动装置液压系统的总体设计框架。详细分析了液压系统中所涉及的静压支承、伺服液压缸、蓄能器组和过滤器等关键技术,并提出了相应的设计方案。该研究对高倍重力加速度离心场下电液伺服振动装置液压系统的设计和应用具有一定的指导意义。     

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.     

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.     

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。     

双叶片套型电解加工流场设计及优化

具有大小双叶片的扩压器能够改善压气机的性能,在航空发动机中得到广泛应用。此类构件多采用高温合金等难切削材料制造,传统铣削加工存在刀具损耗等问题。电解加工技术具有无机械切削力、工具阴极无损耗等特点。提出一种双叶片套型电解加工的方法,基于法向流程等距的原则设计了叶间出液通道,建立了出液通道宽度递增的流道模型,开展了流场仿真研究,当出液通道的宽度为0.9 mm时,加工区域内电解液的流速分布最均匀。选择GH4169材料进行了双叶片套型电解加工的对比试验,试验结果表明,采用叶间出液的电解液流动方式,加工稳定性得到提高,阴极进给速度由0.6 mm/min提高至1.0 mm/min,材料去除速率达到1 396.5 mm³/min,叶片锥度降低至1：14.29以下,轮毂表面形貌得到改善。     

包装机八杆机构式灌装开袋装置的优化设计

在包装机上设计了一种适用于纸塑复合袋(双层袋)的八杆机构式灌装开袋装置,实现了黄皮纸外袋和塑料薄膜内袋的同步开袋和封袋,从而解决了双层袋灌装包装生产线设计中如何同步开袋顺利灌装难题。研究了八杆机构式灌装开袋装置特点,分析了八杆机构优化设计的方法,建立了以机构相位角最小值为目标函数的优化模型,运用MATLAB确定了八杆机构设计尺寸,在ADAMS中建立了虚拟机构模型并进行了运动仿真;当机构运转时,得到了末端连杆角度-时间曲线,符合黄皮纸外袋和塑料薄膜内袋同步开袋和封袋的设计要求,验证了优化设计结果的合理性,对多杆机构装置的机械设计提供了一定参考价值。     

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...