单斗轮取料机斗轮轴密封装置改造

分析了单斗轮取料机斗轮轴密封装置存在的问题,介绍了改进后的密封装置的密封原理、设计方案及使用效果.     

Study on Numerical Simulation of Mold Filling and Solidification Processes under Pressure Conditions

The mold filling and solidification simulation for the high pressure die casting (HPDC) and low pressure die casting (LPDC) processes were studied.A mathematical model considering the turbulent flow and heat transfer phenomenon during the HPDC process has been established and paralled computation technique was used for the mold filling simulation of the process.The laminar flow characteristics of the LPDC process were studied and a simplified model for the mold filling process of wheel castings has been developed.For the solidification simulation under pressure conditions,the cyclic characteristics and the complicated boundary conditions were considered and techniques to improve the computational efficiency are discussed.A new criterion for predicting shrinkage porosity of Al alloy under low pressure condition has been developed in the solidification simulation process.     

机械镀锌工艺及设备

简要介绍了机械镀锌的原理、工艺及其设备.     

Radiant Image Simulation of Pulverized Coal Combustion in Blast Furnace Raceway

The numerical si mulation of combustion processhas been performed[1,2],but thereis still no suitabletemperature measuring technique for three-di men-sional analysis[3].Nowadays,the radiant i mage pro-cessing technique has been developed at home and a-broad[4,5].The relation between radiant i mage andpulverized coal combustion process in blast furnaceraceway was studiedin present work withthis meth-od to examine three-di mensional temperature distri-butionin blast furnace raceway.1Radiant Image…     

钛合金表面激光熔凝一步制备复合生物陶瓷涂层

在经过渡层预处理的ＴＣ４钛合金表面上预置设定配比的ＣａＨＰＯ４·２Ｈ２Ｏ、ＣａＣＯ３混合粉末，比较少量Ｙ２Ｏ３粉末对合成与涂覆生物陶瓷涂层的影响。经优化激光工艺处理后，成功地实现了一步激光束合成与涂覆生物陶瓷涂层。该涂层具有优良的力学性能，且改善了值入材料弹性模量与生物硬组织的匹配性。Ｙ２Ｏ３对生物陶瓷涂层的合成及性能改善均有重要作用。     

iViewer:利用数据服务即时生成跨域数据视图

越来越多的企业和组织选择通过广域、开放的互联网作为其协作平台,业务决策者往往需要即时汇聚并综合分析来自多个部门的资源信息以进行临机决策。如何即时构建满足用户需求的跨组织数据视图,动态维护视图和数据源之间的一致性是需要求解的一个关键问题。提出了一种互联网环境下跨组织业务数据视图的动态生成方法iViewer,利用数据服务来封装自治、异构和动态变化的数据源;通过可视化和易用的数据服务组合操作来动态构建数据视图;提出了一种基于轮询的视图动态更新算法,维护数据源和数据视图的一致性,从而使得数据视图能够随数据源的变化而自主变化;详述了iViewer方法的原理和过程,并通过一个火灾应急处置场景中,面向指挥中心的跨部门火灾救援设备数据视图的动态生成过程例证了iViewer方法的效果。     

A new DSmT combination rule in open frame of discernment and its application

A new combination rule based on Dezert-Smarandache theory (DSmT) is proposed to deal with the conflict evidence resulting from the non-exhaustivity of the discernment frame. A two-dimensional measure factor in Dempster-Shafer theory (DST) is extended to DSmT to judge the conflict degree between evidence. The original DSmT combination rule or new DSmT combination rule can be selected for fusion according to this degree. Finally, some examples in simultaneous fault diagnosis of motor rotor are given to illustrate the effectiveness of the proposed combination rule.     

基于Simulink的永磁同步电机矢量控制系统研究

根据永磁同步电机(PMSM)在d-q坐标系下的数学模型,在Matlab/Simulink环境下,构建了永磁同步电机磁场定向矢量控制的仿真模型,并对PMSM控制系统进行了仿真研究,同时用仿真结果表明了该仿真模型的有效性以及控制算法的正确性,为永磁同步电机控制系统设计和调试提供了理论基础。     

Kaman协议的形式化验证

Kaman协议是移动Ad Hoc网络安全认证机制,然而,协议设计者未对该协议的安全性作严格的形式化分析。协议复合逻辑PCL是验证协议安全属性的形式化方法,PCL逻辑能够简化协议安全分析过程。本文在协议复合逻辑PCL中描述Kaman协议并分析Kaman协议的安全属性,证明Kaman协议能够实现其安全目标。