基于Modbus的PLC与多台电量智能仪表的通信研究

采用PLC实现远程数据的采集已被广泛应用。文中通过应用实例，介绍在Modbus上PLC与多台电量测量仪表（3300ACM）之间单主站多从站通信的实现。     

自适应控制技术在CNC机床上的应用

以在西门子840D系统中集成以色列OMAT公司的ACM自适应控制监视系统为例,论述了ACM自适应控制监视系统的工作原理及其安装调试,并以典型实际应用范例阐述了自适应控制技术在优化金属切削加工中的功效和特色.     

ACM 油封新产品试制

本文主要对美国和日本的几种型号的ACM 油封胶料进行了配方设计以及基本性能测试和比较试验;研究制造了内露骨架双向螺旋沟槽流体动力油封;并对该油封进行台架试验以及装车实际考核应用。     

组合航向系统中数字磁罗盘的罗差补偿研究

研制了一种由数字磁罗盘和角速度陀螺组成的组合航向系统.为了提高系统的航向精度,本文提出了两种有效的误差补偿方法八位置最小二乘法和椭圆假设补偿法.通过将两种算法应用在HMR3300型数字磁罗盘进行航向测量,分析并比较了两种算法的可行性和有效性.实验结果表明椭圆假设补偿法是一种更为智能的误差补偿算法,它能够实现数字磁罗盘的自动误差补偿和自动校准,误差补偿效果良好.     

新薄膜循环利用光

化工巨头3M公司称，如果液晶电视机厂商使用它开发的一种新型薄膜，全球将为此每年节约3300万加仑石油。     

基于视觉的板材自动攻丝机设计

为了提高板材多孔攻丝的质量和效率,设计了一种基于视觉的板材自动攻丝机,系统核心为工业控制计算机和M P3300运动控制器.工业控制计算机利用图形识别技术,实现板材的自动定位;通过读取板材DXF文件获取板材中孔的位置和大小信息;根据孔的位置和大小信息获取板材多孔加工路径.M P3300运动控制器与安川伺服系统组成闭环控制...     

金刚石铰刀加工精密孔的方法

金刚石铰刀具有加工精度高、寿命长和生产率高等优点,目前已广泛用于加工液压分配器壳体和定量泵机体等精密阀孔。金刚石铰刀的结构如图1a所示,它是由带螺旋形切口槽的铸铁套2、锥形刀杆3、前导向套5和后导向套1等组成。在套2的表面上电镀一层细小金刚石颗粒4(ACM40/28,ACM是人造金刚石微粉的牌号,40/28是粒度代号,相当于我国W40粒度,颗粒     

V_2-1250数控机床的镜象功能

V2-1250双主轴数控龙门铣床产于法国FOREST重型机床厂。两主轴分别装在龙门架前后两面的Z轴拖板上。数控系统为美国A·B 3300;伺服系统为液压伺服驱动。 A· B3300数控系统具有镜象功能。通过X、Y1、Z1、Y2和Z2镜象开关的选择,可用一条程序带加工出与坐标轴对称的两种零件。机床在使用中,由于不清除对第二主轴镜象功能的操作,造成许多加工件报废。为了正确掌握这一功能,我们对控制原理进行了分析,并对程序进行了试验。 一、故障现象及分析 应用第二主轴加工 Y,-0117-08零件时,该零件的加工与原程序零件是以X轴相对称的。采用原零件…     

透明台阶的白光干涉测量方法研究

Veeco NT3300表面轮廓仪是基于白光干涉原理的一种非接触测量设备,它的垂直扫描干涉模式可以实现对物体表面形貌的非接触测量。在利用垂直扫描干涉模式对光刻胶形成的透明台阶测量时,设置不同的测量参数会导致较大的测量误差,通过对垂直扫描干涉模式的原理和测量系统的分析,找到了误差产生的原因,并通过合理的测量参数的设置,实现了对透明台阶的准确测量,满足了应用需求。     

地铁车辆辅助供电系统论述

本文阐述了地铁车辆辅助供电系统的交叉供电、扩展供电和并网供电三种主要供电方式原理,比较其优缺点。并网供电由于切换方式简单,布线少,能最大程度保证列车辅助系统优点运行正在越来越多地被推广应用。重点介绍并网供电在网络正常和无网络控制方案,包含并网供电实现的条件,设置辅助负载接触器作用,各台ACM启动时序控制,和如何在并网时序找主ACM。简要介绍避免当母线发生短路故障导致辅助系统供电瘫痪,母线设置母线接触器并网供电。     

新技术经济范式与聚合制造的兴起

分析新技术经济范式对制造系统的发展要求，提出聚合制造方式的概念。分析聚合制造的基本特征与存在形式。阐述聚合制造功能链的概念与特征，并通过对其静态和动态回路的论述以及对功能链断裂与维护的分析来揭示聚合制造的运行过程。     

周期性机械振动主动控制算法

为提高周期性机械装置的隔振性能,减少其对底座(或地面)及周围环境的影响,采用由弹性橡胶和压电堆作动器组成的主动悬置(active control mount, ACM).针对压电堆作动器输出位移较小的情况,设计液压位移放大机构.通过对压电作动器和橡胶主簧性能的分析,建立由主动悬置构成的隔振系统的力学模型.周期性机械振动系统,其周期振动信号可用作控制同步信号,因此控制系统采用基于同步滤波-X LMS(least mean square)算法的自适应控制策略,传递到机座的残余力作为误差信号,实现对周期性机械振动系统的主动控制.计算机仿真实验结果表明,采用这种主动悬置和同步滤波-X LMS算法的主动控制系统,相对于采用普通橡胶悬置的被动系统,明显减少了对底座的力传递,减振效果明显.     

Quality assurance model in mechanical assembly

The uncertainty of mechanical assembly process usually brings great challenge to product quality control and assurance. The systematic approach should be employed in the research to find a comprehensive solution. The quality assurance model for assembly (QAMA), based on the analysis of the major problems in the mechanical assembly process and the factors that affect the quality of products, is established by means of three working models: the assembly process model (APM), the activity control model (ACM), and the quality data model (QDM). The APM formulates the assembly process starting with the analysis of process flow, logical scheme, and key factors. The ACM is built by defining the attributes of control activity, mapping relationship between the control activities and its objects in the multiview space and layers. The ACM presents the control flow with the logical relations among control activities as well as the control rules. Based on the two models mentioned above, the QDM supports the acquisition of quality data through data-collecting carriers along assembly process and defines the data structure to support the system model. All of the three models are grouped into a framework which integrates the technical approaches and solutions for quality assurance in mechanical assembly. Based on modeling studies, a computer-integrated and internet-based system called quality assurance system in mechanical assembly (QAS/MA) has been developed. And the development of QAS/MA proves that APM, ACM, QDM, and QAMA are practical and feasible.     

An electromagnetic calorimeter prototype module using scintillating fibers immersed in a Bi-Pb alloy

The development of Saclay of scintillating fibers allows new compact structures for calorimetry. The construction of a prototype module designed and built at Saclay is described. It contains 3300 scintillating fibers regularly positioned and immersed in a low melting point BiPb alloy, giving a global radiation length of X₀ = 11.2 mm. Results of tests performed on an electron beam at DESY are presented and discussed. In addition, some ideas for industrial production are proposed.     

先进复合材料在航空航天领域的应用

复合材料是当今科技发展的重要物质基础,特别是先进复合材料已经成为应用于航空航天的基本材料之一.本文简要概述了先进复合材料的特性,着重介绍了先进树脂基复合材料、金属基复合材料、陶瓷基复合材料、碳/碳复合材料等的特点和研究进展,以及先进复合材料在航空航天领域的应用.     

Finite element analysis of the head–neck taper interface of modular hip prostheses

The purpose of this paper was to identify which parameters influence the micromotion at the head–neck taper interface of modular hip prostheses. Finite element analysis was performed where 3D models of the head–neck taper interface were subjected to an assembly force, 3300 N of compression, and 100 N of tension. The micromotion increased as the head size, assembly force, and taper size increased. The micromotion also increased when a mixed alloy material combination (CoCr head and Ti6Al4V neck) was used instead of all CoCr alloy prosthesis and when the center of the femoral head was in a more superior position relative to the center of the neck taper.     

Preliminary characterization of a low-powered microwave induced flame plasma for direct organic solvent nebulization

A low powered (<90 W) microwave-induced plasma has been generated at atmospheric pressure by using a Beenakker cavity, a laboratory constructed torch, and a gas mixture of argon (400 ml/min), hydrogen (100 ml/min), and air (130 ml/min). This plasma has an excitation temperature of 3300-3500 K, electron number density of 7 × 10(14) cm(-3), and easily accepts direct methanol and ethanol introduction with a 1 ml/min solution nebulization rate. Detection limits (3σ) obtained from the atomic emission signals of Li, Sr, and Cr in water are 15, 120, and 290 ng/ml, respectively. Similarly, detection limits for the metals in methanol are 15, 120, and 260 ng/ml, respectively, and in ethanol they are 25, 360, and 330 ng/ml, respectively. The linear dynamic range is greater than three orders of magnitude.     

Calibration strategy and generality test of three-axis magnetometers

Calibration strategy will influence the calibration performance of three-axis magnetometers. In this paper, three different calibration strategies (symmetrical calibration, orthogonal calibration and random calibration) are introduced and verified by simulation and experiments. The experimental system mainly consists of three-axis fluxgate magnetometer (MAG3300), 2D nonmagnetic rotation equipment and proton magnetometer. The scalar value of magnetic field was obtained with proton magnetometer and considered to be the true value. Calibration performance of three different calibration strategies were analyzed and compared. Experimental results show that after calibration the scalar RMS error has dropped 88.5%, 85.5% and 87.6% respectively. To check the generality of the estimated error parameters, another site was chosen to be a validation position, and the calibration performance of three calibration strategies were tested and compared. After calibration, the scalar RMS error has dropped 83.2%, 78.9% and 78.8% respectively. Thus the symmetrical calibration is considered to be the best calibration strategy among three calibration strategies.     

A comparison between the use of a high-resolution CCD camera and 35 mm film for obtaining coloured micrographs

In light microscopy, colour CCD cameras are now capable of generating image data sets that contain more information than can be captured with slow 35 mm colour reversal film. The resolution of colour CCD cameras with a high density of sensor elements ( 3300 × 2200 per channel of colour) is equivalent to that of slow 35 mm colour film over typical fields of view for objectives with a wide range of magnifications and numerical apertures. The contrast that can be achieved in images derived from the data sets obtained with colour CCD cameras far exceeds that found with film and can exceed that of human vision. Finally, the data sets collected with high-resolution colour CCD cameras are capable of being displayed at a wide range (four-fold) of different magnifications easily and interchangeably. Consequently, the combination of a data set that describes a relatively large field of view with one or two data sets that describe specific details taken with an eight-fold increase in magnification are all that is necessary to describe the salient features of the vast majority of stained specimens examined with transmitted light microscopy.