直线式箱体全自动无氟发泡线充注机械手的设计

介绍了直线式全自动箱体发泡线充注机械手的结构及其驱动系统,该系统可直接应用在新箱体发泡线的制造上,又可用在老箱体发泡线的改造上,因此具有极大的推广价值和显著的经济效益.     

铜线替代金线在晶体管封装中的压焊工艺研究

通过比较铜线与金线的性能,论述了铜线压焊的特点、设备的改造、铜线产品质量检验与常见不良产品等,在晶体管产量较大时,使用铜线压焊能有效地降低生产成本,因而在通用民品中有着非常广阔的应用前景.     

金亿机械有限公司:玉米收获机创造新纪录

11月18日,山东金亿机械制造有限公司在美丽的海滨城市日照举办了山东省玉米机械化发展与推广研讨会暨2008年商务年会.原计划600多人参加的会议却来了900多人,这在金亿公司是史无前例的,让公司领导及员工忙得不亦乐乎.金亿公司董事长马金英满面春风对记者说:"人气旺盛,一是得益于党的政策好,二是今年金亿公司拥有喜人的表现,小麦机产销1600台,市场占有率由去年的5%提升为15%,玉米机销售1200台,占行业内同类机型首位.同时,金亿产品也是获得政府补贴最多的产品."     

SIMATIC IT助力制造

西门子中国有限公司的业务结构涉及的行业和领域主要包括:信息通讯、自动化与控制、医疗、照明、能源、交通、金融和房地产等.西门子MES属于西门子自动化与驱动集团,这个业务集团是西门子最古老的集团之一,在中国的业务也发展非常好,产品覆盖各行业客户的自动化需求.自动化与驱动集团分为七个部门,MES隶属于其中的自动化与系统部.整个集团全球有近10万种产品,每个月约有18种新产品问世.自动化与驱动集团将其年销售额的约9%用于研发投资,尤其在工业软件方面很多人都认为自动化是一个硬件设备,但随着现在软件的发展,西门子也提供大量的软件开发.     

为推动国内实验室离心机行业升级而努力——专访上海安亭科学仪器厂董事长陆永泉先生

我国的实验室离心机产业近年来在研发生产方面取得了进步,但由于大部分企业的规模较小等原因,整体上与国外产品尚有一定差距。《中国仪器仪表》杂志记者专访了上海安亭科学仪器有限公司董事长陆永泉先生,陆先生评述了实验室离心机行业现状并提出了提高产品水平的措施,为推动国内实验室离心机行业升级提供了很好的建议。     

"数字化组织"迈出智能化敏捷制造第一步

PTC这支在船舶领域雄立多年的老牌劲旅,早在1992年就开始涉足船舶业,并取得了不错的成绩,1998年收购CV公司后更加强了其在船舶业的发展势头.目前在中国,军船市场一直占主导地位,民船虽然近几年才开始兴起,但市场表现也不俗.2007年我国的船舶业迎来了前所未有的井喷时期,也为PTC船舶业绩的提升带来了发展良机,而这一切早已洋溢在了PTC中国船舶业销售总监王慧杰的脸上.     

颅骨解剖机械设备的研制

本文针对目前法医解剖人体颅骨用设备存在的问题,探讨研究一种科学实用的颅骨解剖专用设备,用以提高解剖人员的工作效率,提高解剖质量,改善工作环境.     

防雨、防暴晒、夜晚能自动收缩的智能晾衣架设计

智能晾衣架的机械部分是在普通拉杆式晾衣架两支撑杆的端部各安装一个滑轮,再穿入钢丝绳.钢丝绳与最前外面的晾衣杆固定连接.钢丝绳的另一端连接到与直流电动机相连的转轴上,通过电动机的正反转达到晾衣架的伸缩效果.其控制部分的电路CPU采用89C2051单片机.利用温度、雨水、光敏等传感器,达到下雨时自动收回,雨后自动伸展;气温高于设定值时自动收回,低于设定值时自动伸展;夜晚自动收回,白天自动伸展的功能.     

基于WTK冷冻缸产品设计及加工虚拟现实软件的开发

在虚拟环境中利用数字化产品模型来代替实物模型进行仿真、分析,实现产品设计和制造过程的集成,已成为目前产品开发技术的重要发展方向.文中应用SolidWorks实现产品零配件和虚拟车床、夹具的实体造型,在VC 6.0开发平台上采用与World Tool Kit软件相结合的方法,同时利用与实体造型连接的技术实现虚拟设计和运动视景仿真并虚拟加工过程.     

AutoCAD下幻灯片文件的应用及其批量制作幻灯片文件的方法

AutoCAD环境下的幻灯片文件是一个屏幕显示的快照,目前主要应用在AutoCAD环境下进行二次开发所涉及的用户化界面设计方面.本文尝试了AutoCAD环境下幻灯片文件在零件资料库和用脚本文件播放幻灯片两方面的应用,研究了使用VisualLISP批量制作幻灯片的方法.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.