偏心摆式飞剪机剪切过程及机械参数的优化设计

本文依据对飞剪机的剪切过程中机构位置角、水平速度、轨迹的要求，确定优化设计变量，建立目标函数和约来函数，完成了基于Powell内点惩罚函数法的剪切机构优化设计模型，通过该模型对实际偏心摆式飞剪机剪切机构进行优化设计，使飞剪机的机械参数满足了剪切过程要求，同时提高了飞剪机剪切性能和轧件的剪切质量。     

镀彩生产线飞剪的控制方法

以唐钢彩涂生产线为基础,介绍了飞剪对带钢进行剪切的控制算法。在飞剪进行剪切过程中,飞剪剪刃位置是由与飞剪电动机同轴安装的凸轮开关发出的指令进行控制的,采用所述控制方法进行剪切带钢剪切断面光滑。     

起停式曲柄飞剪剪切机构运动学性能分析

起停式曲柄飞剪，设计思路新颖，是目前较先进的飞剪机之一。针对起停式曲柄飞剪剪切机构的运动学模型，采用MATLAB程序设计语言将其程序化，得出了飞剪剪刃运动轨迹和剪刃速度变化曲线，对于了解飞剪剪切过程、定量分析剪切机构的工作性能和设计同类飞剪具有参考价值。     

螺旋剪刃滚筒式飞剪剪切过程数值模拟

螺旋剪刃滚筒式飞剪是一种新型的滚筒式飞剪,是连续生产线上用于金属板材剪切的重要设备,其性能直接影响到金属板材的剪切质量和精度。飞剪的剪切力是设计飞剪的重要参数,为了获得较准确的剪切力,首先对螺旋剪刃滚筒式飞剪剪切过程进行数值模拟,将获得的平均剪切力与实测数据进行对比和分析,验证了数值模拟计算的可靠性。同时运用有限元方法分析了不同剪刃重叠量、侧间隙、剪切速度等重要工艺参数对剪切力的影响,结果发现剪切速度、剪刃侧间隙对飞剪剪切力的影响较大,而剪刃的重叠量对剪切力影响较小。     

基于虚拟技术的摆式飞剪剪切过程优化

应用虚拟样机技术,在ADAMS中建立了摆式飞剪机构优化设计的参数化模型,并通过ADAMS内置的DOT优化工具,采用序列线性规划法(SLP)对飞剪的剪切过程进行了运动学优化.优化后的飞剪机构满足剪切过程要求,同时提高了飞剪的剪切性能和轧件的剪切质量.     

飞剪机剪切机构动力学性能分析

在对飞剪机剪切机构进行运动分析和动态静力分析的基础上,运用Matlab/Simulink软件建立了其仿真模型.通过仿真计算,获得了飞剪机剪切机构的动力学性能参数,为进一步对飞剪机剪切机构性能优化奠定了基础.     

滚筒式飞剪的设计与结构分析

对滚筒飞剪设计和研制的总结,介绍了这种飞剪的技术参数和工作原理,对滚筒飞剪的剪切工作制度进行了描述,对滚筒飞剪的机械结构进行了说明。     

一种新型飞剪机构运动性能分析与优化改进

用复数矢量法对一种新型飞剪机构做运动性能分析,为了提高飞剪机构的剪切性能和轧件的剪切质量,并使得飞剪的机械参数满足剪切过程的要求,对这种飞剪机构的运动学参数予以优化,从而得出一组合理的机构尺寸,并对优化前后的飞剪机构运动性能加以比较.     

曲柄摇杆飞剪剪切趴头原因分析

本文通过对某带钢厂曲柄摇杆飞剪投用初期飞剪剪切不良出现的不能将头部切掉现象进行理论分析、数据测量及飞剪剪切过程中刀片侧间隙变化的因素分析,将摇杆挂轴和动销轴处原铜瓦改进为轴承,定期检查和更换密封件和磨损轴承等,最终使得飞剪处于良好状态。     

IHI摆式飞剪剪切机构优化设计

飞剪是连续轧制生产线上的重要贵重设备，其结构、控制与调整极其复杂，其运行情况直接影响着轧制生产线的生产效率。作者深入分析了IHI摆式飞剪系统结构组成，并以传动结构简图形式清晰表达了IHI摆式飞剪剪切本体和同步机构之间的协作关系，并以剪切区域内剪刃水平速度与喂料速度误差、摆角误差2个重要性能指标为分目标函数，用加权方式建立了剪切机构优化数学模型。所得优化设计结果，对提高摆式飞剪性能具有重要的价值。     

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.     

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.     

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.     

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....