我国农机检测仪器设备的现状及发展趋势

我国是农业大国，农机设备的研究和发展已经到了一个非常繁荣的地步各种高科技的农机产品层出不穷。因此，农机检测设备发展已经成为我国农业发展中重要的环节，农机检测设备的研究和发展能够提高农机产品的检测质量。本文简单的介绍了我国农机检测设备的发展之路，深入分析了农机检测设备的应用现状以及不足之处，并针对这个问题，提出了几个参考性的意见。     

钢轨连续非接触硬度检测的研究

本文简述了电磁检测硬度的机理，利用电磁无损检测对钢轨双频淬火后的全长连续接触硬度检测进行测试研究，对钢轨纵向硬度的区分度已达到铁道部部标准，对该研究成果转化为生产力进行了初步探讨。     

基于石油机械结构检测中超声波方法的实践研究

石油机械结构检测工作与产业经济效益联系密切，采用高效的无损检测方法有助于提升检测效率，同时也可帮助相关企业降低生产风险。无损检测中，超声波方法因其精确检测的特点成为主要检测方式之一。本文通过探讨石油机械结构检测中存在的问题，表述了无损检测对于石油产业发展的重要性，重点分析了超声波方法在石油机械结构检测中的应用内容。     

超声波检测螺栓头下裂纹的检测概率曲线测定

确定维修检测中可检裂纹的尺寸是制定维修大纲的需要，同时也是损伤容限耐久性分析所必须的重要依据。文中针对飞机机翼大梁的螺接结构，研究其裂纹检测的方法，并完成一条超声波检测裂纹的检测概率曲线。     

建立质量体系是提高检测机构检测质量的重要保证

一．概述检测机构的工作，在于通过检测，向社会或委托方提供客观、公正的检测结果或数据，以表明某个产品或某个项目是否符合规定要求。因此一个错误的检测结果或数据除了影响到产品或项目的质量真实性外，更重要的是可能影响到某个组织（企业或公司）的声誉，乃至组织的生存。因此，一个检测机构，通过建立质量体系，除了可保证检测工作的客观性和公正性外，主要在于确保检测的质量，本文主要论述了检测机构建立质量体系的含义，如何建立质量体系和建立质量体系对检测机构的积极意义。二．检测机构建立质量体系的含义按照ISO8402的定义…     

相序检测的极速算法

醉提出了一种相序检测的新算法，该算法运算极快，使相序检测的速度提高了1000至10000倍，可广泛运用于数字化检测之中。     

基于机器视觉的齿轮缺陷快速检测

结合齿轮缺陷自身的特点，论述了齿轮缺陷检测系统的构成、图像处理及检测流程，提出了一种基于机器视觉的齿轮缺陷快速检测方法。实例分析表明．该检测系统能够快速、准确地实现齿轮缺陷的检测，满足自动化生产的需要，可在实际生产中代替人工检测；     

建筑结构工程质量检测中的无损检测技术探究

现代化建筑作为城市建设的重要标志，随着社会大众对建筑各方面性能的要求不断提高，各种功能性建筑、高层建筑已经成为当前城市建设的主要建筑形式，建筑结构工程质量检测难度也在不断提高。基于现代科技时代背景下，建筑结构工程质量无损检测技术凭借其自身的优势，是当前开展建筑结构检测的主要方式之一，其不仅能够在不破坏建筑结构的前提下，借助科学技术精准检测建筑结构的整体质量，同时能够有效保障其检测结果的科学性与全面性。本文首先简要阐述，当前比较常用的建筑结构无损检测技术及其技术特点，然后重点分析了无损检测技术的应用及效果，并对此进行探究。     

水下结构物磁检测新技术研究进展

本文重点阐述了满足水下结构物检测要求的磁检测新技术，如磁粉检测技术、涡流检测技术、漏磁场检测技术、交流电磁场检测技术、磁记忆检测技术、Magfoils磁膜检测技术等。本文分析了磁检测新技术现状，并指出当前研究中所存在的问题及其发展方向。     

生物芯片技术在食品安全检测中的应用

介绍了国内生物芯片在食品安全检测中的应用情况，特别是食源性致病菌检测、动物疫病病原体检测和兽药残留检测等。     

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...     

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...     

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.     

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。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

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。     

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.     

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.     

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...