基于GTN损伤模型对含边部缺陷硅钢薄板冷轧时边裂的预测

采用拉伸试验和显微组织观测的方法确定了GTN损伤模型中的9个损伤参数,运用GTN损伤模型对冷轧硅钢薄板边部缺陷的扩展及边裂的产生进行了有限元模拟,并与预置缺口的钢板轧制试验进行对比。结果表明:轧制过程中边部缺陷是造成钢板边部裂纹萌生和扩展的一个重要原因,GTN损伤模型可用来预测含边部缺陷硅钢薄板在冷轧过程中边裂的产生;预测结果与试验结果基本一致。     

深入开展＂万点受控＂管理工程为创硅钢品牌奠定基础

武钢冷轧晶粒取向、无取向磁性钢带(片)在2005年9月1日北京举办的中国名牌产品颁奖大会上获"中国名牌产品"殊荣.在创名牌的过程中,开展"万点受控"管理工程功不可没.分三个阶段开展的"万点受控"管理工程,为武钢冷轧硅钢片厂的生产提供了性能优良、工作可靠的物质技术基础,成为打造硅钢精品诸多成功因素中的重要一个.     

用四辊轧机冷轧0.08mm硅钢带

冷轧硅钢带是一种重要的磁性材料。磁钢片越薄,产生的电涡流就越小,铁损越低,磁感强度也越好。我们在生产中摸索、总结出用四辊轧机冷轧薄硅钢带的经验,现介绍如下,供参考。用四辊轧机轧0.2mm以上的厚板比较容易,但要轧出0.08mm的就比较难,因钢带越薄,变形抗力就越大,断辊的现象就严重。如采用粗辊,变形区钢带与轧辊的接触面积显著增大,引起轧制压力上升,轧辊弹性变形大而导致钢带不能轧得更薄。如采用细辊轧制,必须增加粗支撑辊。因此,轧     

冷轧板表面起皮缺陷研究

为了提高冷轧薄板的成材率,研究了冷轧薄板表面条痕缺陷的宏观和微观特征,提出夹杂物、铸坯表面裂纹、气泡是形成表面缺陷的主要原因.严格工艺操作可减少或消除缺陷.     

1420mm冷轧机组吹扫器对钢带质量的影响

通过改进1 420 mm冷轧机组吹扫器结构,使钢带表面的乳化液斑、黑带明显减少,提高了钢带的表面质量。     

电工钢磁时效研究

对太钢生产的冷轧无取向硅钢的磁时效做了初步研究。试验选取不同碳含量试样 ,在不同温度下 ,保温不同时间 ,测量其铁损 (如 P10 /50 )的变化 ,计算出时效率 ,从而估算其磁时效性。结果表明 ,冷轧无取向硅钢的磁时效与钢的碳含量有显著的趋向性。     

基于BP神经网络的冷轧带钢表面质量检测研究

针对传统的方法在冷轧带钢表面缺陷图像模式识别中存在的问题,在小波变换提取特征的基础上,提出了基于BP神经网络的非线性模式识别方法.结合国内实例,对5种典型冷轧带钢表面缺陷图像进行了实验研究,实验结果表明,该方法能够对冷轧带钢表面缺陷图像进行有效识别,具有更好的适应性.     

冷轧硅钢片模具的设计和制作

电动机用硅钢片按生产加工工艺可分热轧和冷轧两种。热轧硅钢片生产过程污染环境、劳动强度大、钢片质量难以提升;冷轧硅钢片厚度均匀、表面质量好、磁性较高。因此,随着工业发展,热轧被冷轧取代。但是,冷轧硅钢的各项性能与热轧硅钢有所不同,在设计上个别项就要有所改动。其中,冷轧硅钢片冲裁后,毛刺要求变小,由原来热轧的≤0．15mm变成了≤0．08mm,这就给冲裁模具的设计和制造提出了更高要求。     

罩式退火中钢带表面氧化缺陷分析

针对罩式退火中钢带的表面氧化缺陷问题,在详细分析了钢带表面氧化缺陷的宏观特征与微观特征以及缺陷形成条件的基础上,根据现场实际设备及工艺特点,给出了钢带表面氧化缺陷的主要成因,提出了相应的控制措施,取得了良好的使用效果.     

冷轧硅钢厂酸再生(ARP)项目自动控制系统

简要介绍了太钢冷轧硅钢厂酸再生项目全厂供配电、传动、自动化、仪表系统的构成以及基本控制功能.系统设计先进,可靠性好,便于维护,具有一定的参考价值.     

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.     

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。     

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.     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.