基于角色的车间人员绩效考核研究

员工绩效评价是企业改进人力资源管理工作的一个关键环节。针对制造业车间员工绩效考核的问题,在综合分析车间组织结构及员工职能范围的基础上,建立了基于角色的车间绩效考核模型,并以物料配送人员为例,应用层次分析法,给出了绩效考核的方法,为车间绩效评价提供了参考。     

基于LS-SVM残差控制图的失控信号诊断

针对多变量统计过程控制中失控信号的诊断问题,提出了一种基于最小二乘支持向量机（LS-SVM）残差控制图的诊断方法,给出了基于LS-SVM残差控制图的构造方法与诊断程序,进行了实例分析与模拟分析,并与基于主成分分析的诊断方法进行了对比。研究结果表明：基于LS-SVM残差控制图的方法可以准确地诊断出失控变量,同时在小样本情况下依然适用。     

供应链可靠性管理研究综述与展望

为避免因发生供应链中断事件而带来的严重后果,从可靠性设计、可靠性评估以及可靠性分析这3个方面,对供应链可靠性管理这一领域的国内外研究现状进行了总结,重点评述了各种可靠性设计途径、评估模型与分析方法在供应链中的适用条件、相互关系以及优缺点。最后指出了目前面,临的主要问题,并对未来的研究作出了展望。     

基于CosmosWorks的折弯机液压补偿能力的分析

建立了折弯机的三维模型,分析了下横梁液压补偿机构的原理并对其进行了设计计算.采用有限元软件CosmosWorks对折弯机下横梁进行了静力分析,定量地描述了下横梁的变形和应力分布状态.通过折弯角度的误差分析以及折弯机滑块与下横梁上表面的挠度曲线的对比研究,得到液压补偿装置的变形规律,验证了液压补偿系统具备对下横梁的挠曲变...     

微切削加工中材料微观结构效应的有限元分析

为了研究材料微观组织结构对微切削加工中尺寸效应的影响,建立了一种基于材料微结构特征的正交切削有限元模型,工件采用非均质材料模型。仿真结果表明：当材料微观组织结构一定时,不同的加工尺度下产生不同的切屑形态;当切削厚度从上百微米下降到几个微米时,切屑由连续状向准静态挤压状转换,切削厚度越接近最小金相颗粒的尺寸,挤压状切屑越明显;在应力分布图上可看出,加工中最大的应力不仅出现在刀刃周围,还出现在异相颗粒之间的晶界处,说明多相材料在微尺度加工下微观结构效应显著。     

Friction and Wear Properties of MoS<Subscript>2</Subscript>-Overcoated Laser Surface-Textured Silver-Containing Nickel-Based Alloy at Elevated Temperatures

The solid lubricant that is coated on a flat surface is easily removed during friction. Surface texture dimples, which act as reservoirs of solid lubricant, can prolong the wear life of solid lubricant films. We textured silver-containing nickel-based alloys by a pulse laser and filled the micro-dimples with molybdenum disulfide powders. The tribological properties of the alloys were tested by rubbing against alloyed steel on a ring-on-disk tribometer at temperatures ranging from room temperature to 600°C . After laser surface texturing, the friction coefficients of the silver-containing nickel-based alloy smeared with molybdenum disulfide powders were reduced at temperatures ranging from room temperature to 400°C. With increasing dimple density, the wear life of the MoS₂ film increased while the wear rate of the nickel-based alloy decreased. The wear life of the textured surface with a dimple density of 11.2% exceeded 10,000 m at room temperature. We conclude that molybdenum disulfide and its oxides stored in the micro-dimples play a role in lubrication at room temperature and high temperatures, respectively.     

Protection of low carbon steel in phosphoric acid by potassium iodide

The corrosion of low carbon steel in 2.5 M phosphoric acid at temperature range of 30–60°C in presence and absence of potassium iodide as an inorganic inhibitor in the range of 0.02–0.05 M at static condition has been investigated. Weight loss and polarization techniques were employed in this investigation. The maximum value of inhibitor efficiency obtained was 99.95% at 50°C in presence of 0.05 M inhibitor concentration. The fraction of surface covered calculated from corrosion rates followed the Langmuir adsorption isotherm. Polarization experiments showed that for a given temperature, the curves were shifted towards the potential axis leading to lower the corrosion rates as the inhibitor concentration increased. Potassium iodide inhibits carbon steel corrosion in H₃PO₄ acid by affecting both anodic and cathodic partial reactions with the anodic reaction being more prevailing.     

超宽带穿墙SAR对目标运动参数的估计和位置矫正

利用超宽带穿墙雷达跟踪运动目标在军事和民用领域的应用日益广泛.目标运动参数估计和位置矫正是超宽带穿墙合成孔径雷达(UWB TW-SAR)对运动目标跟踪的两大关键部分.针对传统方法只能对匀速运动目标参数估计的不足,研究了一种基于乘积型高阶模糊度函数(PHAF)算法的加速运动目标参数估计新方法,并分析了墙体折射对运动目标聚焦位置的影响,对目标运动轨迹进行矫正.仿真结果证明了该方法能较准确地估计加速运动目标参数并实现目标的跟踪.     

应用于磁致伸缩传感器的SSI-USB转换器

为了实现磁致伸缩传感器与上位机的交互,研制了一种由高档8位单片机ATmega128控制的SSI-USB转换器.通过对SSI协议规范的研究,以及对由PDIUSBD12实现的USB接口电路的研究,提出了相关的软硬件设计.最终实现了SSI信号与USB信号的相互转换,从而实现了磁致伸缩传感器与上位机的通信.     

火力发电厂自整流二次风调节阀研究

针对目前国内绝大多数火力发电厂使用翻板阀对二次风进行调节存在的缺点,设计了一套新型二次风调节阀.首先通过数值模拟的方法,对翻板阀和新型二次风调节阀主要结构建模仿真,通过比较结果指出新型二次风调节阀在结构上的合理性.然后通过使用SolidWorks软件对新型二次风调节阀进行结构设计并做必要的分析.最后在实验室搭建实验台,...