插入式电磁流量计的研制

文中介绍了插入式电磁流量计的特点以及它的设计难点,给出了设计方案和样机的初步试验结果.     

Coriolis mass flowmeters: Overview of the current state of the art and latest research

This paper is an update of the overview given by Baker RC [Coriolis flowmeters: Industrial practice and published information. Flow Meas Instrum 1994;5(4):229–46]. Overviews about mass flowmetering are also given in Baker RC [Flow measurement handbook. Cambridge University Press; 2000]. Furthermore, Drahm W and Linnartz H [Coriolis-massflowmeters: State of the art review and innovations. In: Proceedings FLUCOME 2003. 2003] reported about latest innovations in Coriolis technology.

The published information of the last decade is reviewed and the conclusions of the different papers are briefly described.     

多头钻床轨迹规划和仿真软件的开发

针对多主轴头的数控钻床钻孔路径规划问题进行了分析,在充分考虑机床的机械结构和加工效率要求的前提下,提出了多头数控钻床的钻孔路径规划算法。首先分析了DXF文件的结构,接下来将二维空间中的孔群分解成一维空间中的孔群进行钻孔路径的规划。为了验证算法和真实加工的可行性,还开发了仿真软件,针对某工程中的某管板类零件规划了钻孔路径,并进行了仿真加工。仿真加工结果证明,开发的算法正确可靠,可以用来进行多头钻的钻孔路径规划。     

氯碱装置常用流量计原理及选型使用探讨

介绍氯碱装置中常用转子、电磁、涡街、靶式流量计的原理及其选型使用注意事项。     

煤粉质量流量计的选择与应用

介绍了煤粉固体质量流量测量技术及产品,总结了固体质量流量计在粉煤气力输送过程中的应用情况,探讨了电容式固体流量计工业规模下试验标定方法和结果,对于气固两相流工业在线测量提供了参考。     

车削加工轴受弹性约束的变温应力计算

本文计算了车削加工中工件承受弹性(或部分)约束及主轴热伸长影响情况下轴的变温应力.文章将工艺系统刚度和热变形两个因素引入变温应力计算公式中,提高了轴受弹性(或部分)约束的变温应力计算精度,为提高零件加工精度提供了理论依据.     

流量计在大型水煤浆制氨装置上的选型及应用

结合水煤浆加压气化制合成氨的工艺流程和特点，提出流量计选型和安装时着重考虑的问题，介绍流量计在渭河化肥厂合成氨装置上的应用情况。     

相互重叠的油气泡对流量计敏感场影响分析

运用有限元软件ANSYS对电磁流量计中存在相互重叠的油气泡建立仿真模型,在此模型下对电磁流量计敏感场进行了数据分析,研究了流量计中含有两个相互重叠的球形油气泡与一个与其等大的油气泡对电磁流量计的响应特性之间的关系,进而揭示多个重叠油气泡与一个与其等大的油气泡对电磁流量计响应特性的影响,研究结果可为电磁感应测量多相流中的气包油、油包气及油气包水等情况提供一定参考依据。     

水厂的同步计量技术的研究

介绍了一种基于先进的现场总线技术和以太控制网络技术的水厂出水量统计方法,达到了计算机同步读取流量表计读数的目的.实际应用表明该技术更具合理性.     

Error correction in hydrostatic spindles by optimal bearing tuning

In this paper a high precision grinding wheel is considered as a rigid rotor mounted on two hydrostatic bearings. The equations for small perturbations of the wheel on the bearings are derived in the form of a multi-input, multi-output transfer function matrix, enabling the frequency response function of the wheel to be determined. Thereafter an optimisation algorithm is proposed which considers speed, load and dimensions of the spindle, and computes optimal stiffness and damping of the bearings. The dynamic characteristics of the bearings, tuned for minimum radial displacement of the spindle, is achieved maximising thereby the accuracy of the grinding process. Simulation results show that by stiffness coarse adjustment, and fine adjustment of the damping in the bearings, a spindle with 35 μm manufacturing error, can produce components with 3 μm accuracy.