基于SOA的敏捷策略的系统架构的研究

随着企业信息化和市场的发展,企业应对环境的变化能力成为头等大事。通过研究SOA的现状,发现SOA在认识和实施中存在的问题,结合敏捷策略的机动性的优点,构建了基于SOA的敏捷策略的系统框架。利用先进的Web Services作为技术基础,充分发挥团队的能力,将敏捷、信息流和模块的优点结合在一起,解决企业实施中的问题,适应了市场的变化。结合生产实际,证实了二者结合的有效性和实用价值。     

精简的IT方便的协同

企业信息化要真正以企业为主体,由企业主导,尤其在总体集成上,提倡“精简IT”,同时,要注重提供真正方便的协同手段,协同工具,实现企业内部及企业间的协作沟通,提高产业链的灵活性。     

倒立摆的PID神经元网络的间接控制系统的研究

摆系统是一个典型的强耦合、非线性、高阶次的不稳定系统.由于摆系统的数学模型是在忽略了次要因素的基础上得出来的,而实际上是一个非线性的系统,当系统受到外部的干扰时,这些次要因素的影响比较突出.实验采用PID神经元,设计一个神经网络间接自适应控制系统,首先用一个神经网络对摆系统模型进行辨识,辨识完成后,辨识模型的权值与隐层积分元的数值传递给具有同样结构的PID神经元的神经网络控制器,对倒立摆进行自适应控制.最后根据以上算法,采用6.0编写控制程序,实现对平面一级摆系统的实时控制.     

回暖的季节 复苏的距离

去年这个时候,正是金融危机肆虐全球的时候,各行各业都受到了猛烈的冲击,一种山雨欲来风满楼的态势,令全球的空气都变得异常紧张,似乎连那个冬天都特别的寒冷。我们就像一棵棵寒风中的树,小心翼翼的站在那里,希望下一个倒下的不是自己。大家都搓着手、哈这气,想尽办法来取暧,企盼着春天的到来。     

艰难的历程 辉煌的成绩

在《中国设备工程》杂志创刊20周年之际, 作为杂志的忠实读者和长期从事设备维修工程的科技工作者,我的心情十分激动,感慨万千! 回顾杂志走过的20年历程,不难看出, 《中国设备工程》杂志是伴随着国家的改革开放、开拓创新、克服困难、与时俱进而逐步发展起来的。党的十一届三中全会结束以后,全党全国的工     

成熟的市场该是什么样的

这2天在衡阳走,最切身的感受是,这座城市较发达城市来看还有诸多的不成熟,一如它的空调市场,还有很长的路要走。你听说过高铁站正规的出租车通道,打车是需要议价的吗？而且说不定不给小票。没错,以小见大,这是衡阳许多现象的一个具化反应。早在中部地区还不像现在被重视时,我们对湖南的了解可能除了芒果台就所知甚少了,更别说衡阳。其实,衡阳作为整个湖南GDP第三大的市场（和第二名差距很小）,在未来所拥有的潜力是巨大的,只是挖掘潜力需要的是时间和耐心，当然还得有科学合理的手段。     

基于VB的虚拟应变仪的设计

为解决传统应变仪测量中存在的设备匹配,调试麻烦等不足,采用虚拟仪器技术,以VB为开发平台,设计了虚拟应变仪。系统由应变检测模块,数据采集模块,人机接口模块组成。系统充分利用了AD7710的特点简化了硬件设计,使用虚拟仪器技术拓展了应变仪的功能,满足了应变测量内容多样性的要求。试验表明,系统不仅具有较高的测量精度和稳定性,取得理想效果,而且具有较大的拓展空间。     

基于SolidWorks的气动离合器的设计

为解决烟草切丝机启动或停止,刀辊与输送链的速比不匹配造成烟丝宽度不均匀的问题,需在输送链中设置离合器,利用SolidWorks2010软件建模,并在模型确定的参数条件下进行离合器分离和结合的校核计算,再利用尺寸驱动和干涉检查等功能不断修改设计模型,最终确定各零件的参数,以较短的时间和较低的费用设计出了气动机械式离合器,它的工作面采用三角牙齿形,结合直接由气缸驱动,分离由复位弹簧实现。该离合器安装于切丝机上,已广泛用于烟厂制丝线。     

时间的纹理岁月的奇迹

木质工艺在制表领域的运用,早就不是什么新鲜事。去年百达翡丽推出了木质细工镶嵌的老虎手表,卡地亚推出了珍木细工镶嵌的棕熊手表,积家的空气座钟表面是细木镶嵌的绘画艺术,2011年爱马仕用细工镶嵌工艺再现了她的丝巾,豪门世家也在木质细工镶嵌方面做出了成绩。今年。帕玛强尼一口气推出了三款木质细工镶嵌工艺的作品,这不得不引起我们对古老木质工艺的重视。当然,帕玛强尼不是最先吃螃蟹的人,但毫无疑问,今年,帕玛强尼是吃螃蟹最多的人。     

基于ANSYS的光碟机的热量分析

机电产品随着使用时间的持续增加,许多发热电子元器件需要及时散热。否则,将影响产品的正常功能。目前散热方式有：辐射散热,传导散热,对流散热和蒸发散热等,本文针对光碟机的散热垫,利用有限元分析软件ANSYS进行了传导散热的相关分析,供散热分析者学习借鉴。     

A review of the fundamental concepts of measurement

The paper surveys the current state of the theory of the fundamental concepts of measurement which is based on the model theory of logic. A brief review is given of the historical development of measurement theory. The model-theoretic definition of measurement is presented, together with a discussion of representation and uniqueness conditions. Nominal, ordinal, extensive and interval measurement structures are outlined. The classification of scale types and the problem of meaningfulness are considered. A survey is given of conjoint and derived measurement. A brief review is made of the applications of measurement theory. Consideration is given to the treatment of uncertainty. The setting-up of systems of scales of measurement for a domain of science and its relation to theories for that domain are discussed. It is argued that measurement as defined is related to other forms of symbolic representation such as is involved in computer data representation and natural language.     

Distribution curves of sectional areas through some families of convex particles

We outline the results of a computer program which calculates frequency distributions of functions of cross-sectional regions of convex planar-faced polyhedra, ‘sphero-polyhedra’, and populations of perturbed polyhedra. This is done by ‘cutting’ a computer representation of the figure by a large number of random planes. The procedure is applied to cubes, dodecahedra, truncated octahedra, and approximate β-tetrakaidecahedra. Certain aspects of the shape of the object, e.g. sharpness of corners, angularity, compactness, and degree of symmetry are related to aspects of the shape of the distribution curves, e.g. beginning and ending points of the curves, rate of rise of the peak, relative location of the peak, and height and width of the peak.     

高速动车组减振器载荷特征研究

减振器的主要功能是提供阻尼力以衰减和抑制车辆系统振动,对高速动车组动力性能有十分重要的影响。既有研究主要将减振器处理为阻尼力以研究车辆系统动力性能,极少从动力学和结构可靠性角度关注减振器自身承受的载荷。制作某型高速动车组转向架抗蛇行减振器、轴箱减振器、二系横向和垂向减振器测力元件,在大同-西安高速线路上测试并获得该型动车组运行过程中四种减振器载荷引起的应变信号。对测试数据进行处理和分析,获得高速动车组运行工况下四种减振器载荷的时间历程,分析减振器载荷的时域和频域特征。采用雨流计数法统计减振器载荷峰谷值和频次,获得不同速度等级下载荷分布。结果表明,高速动车组抗蛇行减振器载荷最大、二系横向减振器载荷最小。轴箱减振器相对速度最大、二系横向减振器相对速度最小。减振器载荷总体上呈正态分布,而且一般有列车运行速度越高减振器载荷越大。列车正线行驶时曲线半径对轴箱减振器、二系垂向减振器以及二系横向减振器载荷影响不明显,列车速度和线路小半径曲线对抗蛇行减振器载荷影响明显。     

混合驱动机构研究进展与发展趋势

混合驱动机构是可控机构的一种,其适度柔性以及降低驱动与控制成本的特性与优势使其成为现代机构学的重要研究分支之一。随着对混合驱动机构研究的深入,混合驱动机构理论和应用也不断地发展和创新。对现有的研究成果加以分析和总结将有利于促进混合驱动机构理论和应用的进一步发展。分析混合驱动机构的内涵,分别论述双自由度和多自由度混合驱动机构的研究进展,主要包括:混合驱动机构的构型设计与可动性、混合驱动机构的轨迹特征、混合驱动机构的运动学、混合驱动机构的动力学及混合驱动机构的应用等方面的研究进展。提出混合驱动机构研究的关键问题,总结了混合驱动机构的未来发展趋势。研究成果对拓展混合驱动机构的设计空间、开辟混合驱动机构新的应用领域具有重要意义。     

Evaluating the Wear in Steel-Steel and Iron-Iron Friction Pairs by the Eddy-Current Method

Results of a study of steel-steel and iron-iron friction pairs by eddy-current and X-ray methods are reported. An eddy-current transducer is shown to yield a generalized characteristic of changes in the properties of a surface layer in the process of its wearing. Similar results are obtained by the X-ray investigation of the same layer. A correlation between readings of an eddy-current device and the magnitude of the linear wear in the contact zone of tribological coupling is shown to exist at the stage of steady-state and intensive wear.__________Translated from Defektoskopiya, Vol. 41, No. 4, 2005, pp. 17–24.Original Russian Text Copyright © 2005 by Gorkunov, Kharlamov, Kogan, Zadvorkin.Dedicated to the 100th Anniversary of the Birthday of Corresponding Member of the Russian Academy of Sciences M. N. Mikheev     

机械结构液体层厚度超声谐振的测量方法

针对机械结构安全运行的需要,进行机械结构液体层厚度超声谐振测量方法研究。基于垂直入射纵波在三层介质中传播的连续模型,通过对不同厚度液体层超声反射系数分析,提出一种基于超声反射系数谐振频率的液体层厚度测量方法。在对超声谐振测量系统进行标定的基础上,进行机械结构液体层厚度超声谐振测量试验研究,同时研究了3层介质的声学特性对液体层超声反射系数及厚度测量的影响。结果表明,液体层反射系数的谐振频率能够表征其厚度。在对测量系统进行标定的基础上,测量误差基本保持在5%以内。液体层两侧介质材料的变化对液体层的测量基本没有影响,但液体层介质材料的变化将对测量系统产生影响,需要重新对测量系统进行标定。     

纳米CeO2/Zn-4.5Al-RE复合材料的力学性能及表观粘度

测试了不同增强颗粒质量分数的纳米CeO2/Zn-4.5Al-RE复合材料的力学性能,测定了柱形试样熔化前后的高度变化率,讨论了复合材料的表观粘度,并研究了纳米CeO2含量对两者的影响规律.结果表明:CeO2的加入提高了基体的力学性能,当其含量为3%时,复合材料的维氏硬度、弹性模量和抗拉强度分别达到96.7 HV,17.1 GPa和176.5 MPa,较基体分别提高了41.2%,34.6%和34.2%,而伸长率则降低了4.6%;随着CeO2含量的增加,复合材料的高度变化率△H/H0大大降低,粘度急剧增大.     

Effect of manufacturing and assembly defects on two-stage gear systems vibration

The modeling of the dynamic behavior of a two-stage gear system is made for a general configuration of wheels location. The excitation is induced by the periodic variation of the mesh stiffness. This case describes the real working of the gearings. The variation of the mesh phasing is related to the number of teeth and also to the wheels location. We developed a plane model of a two-stage gear system. The modal analysis of the system was then treated. The calculation of the dynamic response was done by a step-by-step time integration method (Newmark algorithm). Three cases of wheels location are treated. The solutions are presented both in the frequency domain and in the time domain. Three types of geometric defects of the toothed wheels are introduced in the model: defect of eccentricity, profile error and assembly defect. An analysis of the effects of these defects on the gear system dynamic behavior is then treated.     

Development of standard reference materials for air quality measurement.

The National Bureau of Standards is engaged in a continuing program involving gaseous Standard Reference Materials for air pollution measurements. Preparation of such materials requires definition of the stability, homogeneity, and accuracy of the samples. This information is obtained by long term studies of the gas systems, by development of absolute methods of analysis, and by analysis of large numbers of samples prepared in bulk. The results of studies, extending over several years, of low concentration of carbon monoxide in nitrogen and nitric oxide in nitrogen are reported. Over one thousand samples of these materials have been analyzed and the stability with time and the within-batch homogeneity have been characterized. Accuracy is achieved by use of gravimetric standards and with dynamic dilution systems. Accuracy attainable by either method is described. The use of permeation tubes of sulfur dioxide and nitrogen dioxide is necessary in some situations because of the reactivity of the gases. Data covering the stability and accuracy of these devices has been collected over a period of several years.     

动压气体润滑在精密仪器上的研究发展

本文综述了动压气体润滑在精密仪器上的研究发展情况。动压气体润滑在精密仪器上研究应用在气体润滑的研究领域中开展得最早,五十年代已在惯性导航用陀螺仪表上应用了动压气体润滑,从而对美国第一颗人造卫星的成功发挥了作用。这些年来在其它精密仪器上的应用取得了不少成效。例如:在大型电子计算机用的磁鼓、磁头和激光打印机上都有成效。本文就动压气体润滑的特点、动压气体轴承的设计、材料、加工方法等方面以及动压气体螺旋槽式轴承的实例进行了综述。