一种高灵敏度的激光衍射传感器

本文利用激光衍射计量技术,测定了铜的热线胀系数,找出温度和位移的变化规律,分析了它作为一种光传感器广泛适用于小量程、高精度、高灵敏度的测量,显示出装置简单、操作方便、测定快速、造价低廉等优点。     

莫尔偏转法测量相位物体的基本公式导出

本文从几何光学和傅里叶光学中最基本的公式和理论出发,推导出用莫尔偏转法测量相位物体的基本公式,为在用莫尔偏转法测量相位物体时,提供了处理实验结果的理论依据。     

金属切削温度测量方法研究

金属切削温度的测量在整个金属切削工艺中承担着举足轻重的作用。本文综述了金属切削温度测量的各种方法以及优缺点,同时详细介绍了测量温度的各种方法在操作时所需要的适宜环境。     

空间三反相机调焦范围的确定

为了提高空间相机对温度的适应能力,改善相机成像质量,研究了如何通过调焦放宽相机的热控指标,降低相机热控难度的问题.推导出了纯反射离轴三反光学系统中后截距及相机受温度影响下焦面离焦的数学公式;分析证明了相机离焦量与温度变化是线性关系,并计算得到了常数项K值.计算显示,当反射镜材料的线胀系数与相机支撑框架材料线胀系数一致时,焦面不产生离焦;而两种材料线胀系数差距越大,离焦量就越大.利用离焦传递函数公式证明了当相机温度水平变化超过±1℃时(对应离焦量0.05 mm),就必须采用机械调焦的方法对其加以补偿;利用光机热集成仿真的方法,得出保证相机成像质量的温度范围At,完成了从光学指标到温度指标的转换.利用离焦公式,得出了相机的调焦范围.最后,在热真空环境下试验验证了上述焦面离焦的数学公式及相机温度水平变化±4℃时离焦量为±0.184mm是相机合适的调焦范围.     

自然对流冷却条件下油箱油温变化规律研究

高寒环境中,测试设备只能间断性地测量飞机油箱燃油温度,如果要获得温度连续变化的趋势,只能通过试验数据拟合的办法。本文以传热学理论为基础,以飞机油箱基本参数为条件,推导出了油箱油温变化的理论公式,并以此公式为指导来拟合温度变化趋势,所得的拟合方程与试验数据变化规律一致,且误差较小,表明机翼油箱油温变化符合自然指数形式的变化规律。另外,结合理论推导的数据拟合,工程实用性很强,具备较大的推广价值。     

ATZ—8型双面度盘秤示值误差在—20～40℃范围内的补偿

ＡＴＺ－８型双面度盘秤在－２０￣４０℃温区内的示值误差采用热双金属片进行补偿，使之达到国家标准所规定的允差限内。本文提出先测秤用弹簧的温度系数，再计算改变杠杆比所需双金属的变形量，最后由变形量计算出热双金属片的热物性参数，由此确定热双金属的牌号。本文的理论计算与实验结果是吻合的。     

基于真空管式炉的金属线胀系数测定仪的研究

为满足理工类高校中开设热学教学实验课程对相关仪器设备的要求,综合上海交通大学物理教学实验中心十年的实际相关教学与设备使用改进的经验,介绍了一种以玻璃真空管式炉为平台的新型金属线胀系数测定仪。玻璃真空管式炉为实验提供了温度均匀且足够大的等温场,产品具有透明直观、实验内容丰富、可拓展性强等优点。     

用小孔法测量焊缝残余应力的研究

本文根据在焊缝上钻孔前后所测得的应变值就化,借助弹性理论推导出计算残余应力的公式;研究了实测残余应力的方法,并测量出开槽焊缝残余应力的分布状况。     

金属波纹管力学特性的计算

本文主要讨论应用于机械密封装置中的焊接金属波纹管力学性能的计算。文章从超薄板的变形理论出发,推导出计算焊接金属波纹管刚度系数的公式,并利用虚位移原理推导出计算波纹管有效直径的公式。文中还推导出在介质不同的压力下,波纹管有效直径变化的计算方法。     

双辉等离子渗金属中的光电高温计测温研究

分析比较了几种应用在双辉等离子渗金属中的测温手段存在的问题，指出了准确控制工件温度的重要性。为准确测量出工件温度，借助自制的一套热电偶测温实验装置，对光电高温计测温进行了比对实验，探讨了工件温度、保温时间等工艺参数对光电高温计测温精度的影响。实验结果表明：在双辉等离子渗金属过程中，光电高温计测温过程分动态和稳态两个阶段；对不同的工件温度，应用不同的ε值来测量。     

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...     

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。     

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.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

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。     

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...