AOD转炉氧枪喷头国产化研制

国产化的φ168 mm氧枪喷头在试用过程中,完全达到了进口氧枪喷头的使用寿命.通过在实际冶炼过程中的性能比较,国产化氧枪喷头完全可以替代进口.     

基于SIMP及应变能理论的高速动车齿轮箱结构优化

为获得高速动车齿轮箱最优结构设计方案,针对目前国产高速动车牵引齿轮箱箱体特点及存在的问题,基于SIMP(solid isotropic material with penalization)材料插值模型及应变能理论,利用软件HyperMesh中的拓扑优化与形状优化模块对动车齿轮箱箱体结构进行拓扑优化和局部形状优化.优化结果表明:优化后的动车齿轮箱结构的最大变形和最大应力有大幅度降低,能有效提高齿轮箱箱体的刚度和强度.文中结果可为设计性能优异的国产化高速动车齿轮箱提供数据支持.     

高速齿轮修形技术在大功率新型高速齿轮箱上的应用

通过高速齿轮修形技术在大功率新型高速箱上的应用,对不同修形进行了对比试验,验证了高速修形技术对高速齿轮箱噪声、振动及对载荷分布的有利改善作用。     

挤压脱水机齿轮箱国产化实践

对该型首次国产化齿轮箱的齿轮损伤，末级大齿轮的联接键槽及平键的损伤进行失效分析。参考原进口齿轮箱结构进行二次国产化设计，齿轮采用优质合金渗碳钢，采用磨齿工艺，提高齿轮精度，改善润滑冷却系统，减少维修工作量，达到安全稳定运行。     

大功率高速齿轮箱设计与制造中的几个问题

本文对我国大功率高速齿轮设计与制造中所使用的工艺方法:(1)渐开线齿形、渗碳后磨齿。(2)渐开线齿形、精滚后进行氮化热处理。(3)调质热处理后、精滚加工圆弧点啮合齿轮,然后进行逐级加载跑合。以及这几种工艺方法目前所达到的水平等作扼要的介绍。另外,还对高速大功率齿轮箱的关键问题:动载荷、齿轮强度校核、滑动轴承的制造等提出了一些看法。大功率高速齿轮箱往往在燃气轮机装置及其试验台上、化工用的压气机组、高炉用的鼓风机等产品上遇到。这类齿轮箱要求功率大(一千至二万马力以上)、转速高(每分钟三千至二万转以上),因而在设计中必然会产生齿轮圆周线速度高(50至140米/秒),轮齿和轴承负荷大,小齿轮的总变形大等一系列问题。所以必须在设计与制造的过程中,采取相应的措施,才能达到设计的要求。     

我国核电循环泵齿轮箱的发展概况

简要概述了国内外核能发电业的发展状况,及核电循环泵齿轮箱的国产化应用情况,指出了目前制约我国核电齿轮箱国产化的主要问题,展望了核电齿轮箱国产化的发展前景。     

宝钢冷轧厂1420拉矫机用KGX500行星叠加齿轮箱国产化研究

综述了原德国进口KGXS00行星叠加齿轮箱锥齿轮失效,轴承烧圈等现象的系统分析,通过优化设计,从箱体结构,齿轮材料,公差配合上进行了国产化改进设计。     

上海地铁5号线司机控制器国产化开发

介绍了上海地铁5号线司机控制器国产化研制背景、研制要求及研制方案,并对进口司机控制器存在的问题进行了优化改进。国产化后的司机控制器通过了客户试验和型式试验验证,性能满足设计要求,可替代进口司机控制器进行工作。     

GJK250型高速重载增速齿轮箱的研制

本文介绍了一台由国内自行设计制造,业已在大型化工企业中成功地长期运行的大功率高速重载增速齿轮箱的研制情况,从设计上与工艺上叙述取得成果的措施,具体介绍了齿顶曲线修缘技术.     

ECK2150A数控活塞变椭圆车床的研发与应用

正一、概述大功率船用柴油机是船舶的关键设备,此领域基本上由MAN BW和Wartsila两大国外巨头垄断。虽然我国造船量约占世界市场份额的40%,但大功率船用柴油机有70%依赖国外进口。特别是受进口限制,我国海军舰艇的发动机必须国产化。如果发动机的功率达不到先进水平,舰艇速度就难以与敌舰抗衡,就会在局部战争中处于被动挨打的地位。     

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。     

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.     

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.     

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。     

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.