某型两座标联动数控车床改造及测试系统

基于某厂的旧式重型卧式车床整体结构、静压托架及导轨、刀架导轨和磨削装置等进行改造,并搭建相应测试系统,对其主要技术参数、几何精度、噪音、温度等进行测试。功能测试结果表明,主要技术参数保持不变,几何精度有所提高,噪音、温度符合功能要求,满足生产需求,对类似车床改造具有一定参考价值。     

基于伺服机构模拟装置的仿真模型分析

伺服机构是控制系统中关键的控制执行机构，其组成较为复杂且成本较高，测试试验时流程繁琐，不利于重复测试。提出一种用于仿真的伺服机构模拟装置，主要用于替代价格较为昂贵且工作寿命有限的真实伺服系统，可模拟伺服系统极限工作状态和特性变化范围，重点对实现该模拟装置的仿真模型进行分析论述。伺服机构模拟装置由一台伺服控制器和一套主要以NI公司硬件为基础的PXI总线控制器作为硬件平台，其中， PXI总线控制器用于模拟真实伺服系统其他硬件特性和负载特性。伺服系统的系统仿真模型主要包括控制算法模块、执行机构模块、能源模块、负载模块，其中，控制算法模块运行于伺服控制器中，执行机构模块、能源模块、负载模块运行于PXI总线实时测控系统中。通过开发的模拟装置各部分软件对控制器及其硬件板卡进行各种操作，以满足系统的需求。通过对系统性能测试结果分析，全部数据满足相关技术指标要求，与真实产品测试结果相比相差较小，能够满足使用要求。     

通信线缆自动架空装置设计CSCD

针对人工架设通信线缆所带来的高空坠落风险、效率低、人力成本大等问题,设计了一款可高空作业的通信线缆自动架空装置。通过分析线缆架空的需求以及人工安装过程,明确了自动作业装置的功能需求,提出了装置的总体设计方案;对装置的结构设计、电气选型、控制电路及控制软件等关键技术进行了详细研究。研制了通信线缆自动架空装置原理样机,并进行了功能测试及实验验证,满足了通信线缆的自动架空需求。     

第二十一届多国仪器仪表展览会展商动态（2010年9月6-9日国家会议中心）

北京中科泛华测控技术有限公司推出智能角位移传感器测试系统 智能角位移传感器测试系统主要用于对磁电式弧形或圆形传感器的标定和功能测试。采用测试台、机柜分离的设计,可与泛华早期推出的“智能直线位移传感器标定与功能测试平台”共用除测试台外的其他设备,满足了用户对设备高复用性的要求。     

通信线缆自动架空装置设计

针对人工架设通信线缆所带来的高空坠落风险、效率低、人力成本大等问题,设计了一款可高空作业的通信线缆自动架空装置。通过分析线缆架空的需求以及人工安装过程,明确了自动作业装置的功能需求,提出了装置的总体设计方案;对装置的结构设计、电气选型、控制电路及控制软件等关键技术进行了详细研究。研制了通信线缆自动架空装置原理样机,并进行了功能测试及实验验证,满足了通信线缆的自动架空需求。     

水下控制系统测试台设计及试验研究

针对水下控制模块测试需求,文中设计了一种多功能水下控制模块测试台。水下控制模块(SCM)作为水下生产系统的核心部分,其安装成本高、难度大,且不便于在水下维护,因此,在其入水前必须对其进行严格的功能测试,确保在水下工作的可靠性。首先,对关于水下控制模块测试的相关技术和标准进行研究,得出水下控制模块在测试台上进行的测试主要包括内部静水压力测试、液压内部泄漏测试和液压系统功能测试;然后,基于被测水下控制模块的性能指标对测试台的机械结构和液压系统进行了设计,并对上述测试内容的测试方法进行了研究;最后,通过试验对测试台的测试功能进行验证。文中研究为我国设计和研制国产水下生产系统测试设备提供了宝贵经验。     

内窥镜使用的聚酰亚胺涂覆层的纤维束包括双包层光纤

本文研究了一种适用于临床前研究的小型化（<0.4 mm）、低成本纤维束内窥镜装置。该装置包含有一个渐变折射率（GRIN）透镜,它安装在光纤图像引导器的近端。提出了一种简化、低成本的装置连接方案,并讨论了可应用的连接方案。装置中使用的纤维束表面包覆有聚酰亚胺,其在长期和短期植入时都具有生物相容性。最终制备的装置能够承受化学清洗、消毒和高压灭菌,满足普通实验室和临床程序的需求,并且对整体性能有较小的影响。为了验证纤维束的成像质量,本文使用标准测试靶标和荧光微球进行评估。结果表明,光纤与自发荧光之间的串扰对成像质量的影响很小,该纤维束无需复杂光路和激光扫描即可实现荧光样品分子级的分辨率。     

应用于内窥镜的聚酰亚胺涂覆双包层光纤束(英文)

本文研究了一种适用于临床前研究的小型化(0.4mm)、低成本纤维束内窥镜装置。该装置包含有一个渐变折射率(GRIN)透镜,它安装在光纤图像引导器的近端。提出了一种简化、低成本的装置连接方案,并讨论了可应用的连接方案。装置中使用的纤维束表面包覆有聚酰亚胺,其在长期和短期植入时都具有生物相容性。最终制备的装置能够承受化学清洗、消毒和高压灭菌,满足普通实验室和临床程序的需求,并且对整体性能有较小的影响。为了验证纤维束的成像质量,本文使用标准测试靶标和荧光微球进行评估。结果表明,光纤与自发荧光之间的串扰对成像质量的影响很小,该纤维束无需复杂光路和激光扫描即可实现荧光样品分子级的分辨率。     

仿生测试理论与仪器工程

提出了一个面向 2 1世纪的测试理论与仪器创新研究的新领域——仿生测试理论与仪器工程。从 2 1世纪测试理论与仪器的特征和需求出发 ,论述仿生测试理论与仪器研究的科学依据、发展历史和科学问题 ,指出结构和运动仿生、功能仿生、智能仿生 ,特别是生命过程和智能行为模拟 (仿生 ) ,对未来测试理论与仪器科学的发展将产生巨大影响     

多功能温湿度现场校验装置的设计

本文的主要内容是主要利用虚拟仪器技术设计一套多功能温湿度现场校验装置,该装置可连接铂电阻和热电偶测量温度、连接湿度传感器测量湿度、同时还可以测量电压和电流,具有便携、高效、功能多等特点,可用于工作现场的温湿度的校准及测试。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.