An Evaluation of Starting-Load Capacity and Static Friction in Babbitt-Lined,Hydrodynamic Journal Bearings

A recent application called for starting 127-mm (5-in) diameter, babbitt-lined hydrodynamic journal bearings under unit loads of about 10.34 MPa (1500 psi). In this application, the load was imposed only a few seconds before rotation could be started and hydrostatic jacking was not permitted. This paper presents the results of a test effort in which one full-size bearing was subjected to several hundred starts under unit loads ranging from 3.4 to 15.5 MPa (500 to 2250 psi). The dwell time between load application and start of rotation was varied in the test from less than one second to more than one hour. The paper also provides a review of the relevant literature, as well as calculations of the contact zone temperature during starts under boundary lubrication conditions.     

双摆台五坐标铣削后置处理软件Star-Fpost研究

针对MIRON UCP800双摆台立式五坐标加工中心,研究其五坐标加工的数学模型.推导出刀心和刀轴矢量六坐标转换成AC双摆台式五坐标的算法公式.利用坐标矩阵转换的方法实现直线圆弧插补刀轨源文件到机床代码的后置处理过程.使用面向对象程序,采取逐行读取刀轨文件关键字触发的方式,开发了专用的五坐标铣削后置处理软件Star-Fpost,在VERICUT仿真环境中完成五坐标机床的建模,在UGNX通过三元整体轴径流式叶轮的仿真加工,仿真结果验证了后置处理软件的功能,可以为MIKRON UCP800五坐标机床实际加工提供参考.     

S7-300 PLC在立式锥形穿孔机顶杆小车电气控制系统中的应用

介绍立式锥形穿孔机顶杆小车电气控制系统中硬件组态、直流传动装置与PLC的通信、软件编程等内容,以及在实际运行中遇到的问题及解决办法。     

四风道煤粉燃烧器常见问题分析及解决措施

介绍了水泥回转窑用四风道煤粉燃烧器的结构及其原理,以及四风道煤粉燃烧器在水泥厂实际使用过程中常见的一些问题,并针对这些问题提出了解决或改进的方法和措施。     

弹丸垂直侵彻陶瓷/金属复合靶板的简化模型

根据薄板在冲击载荷作用下的动力响应理论，利用能量法建立了陶瓷／金属复舍靶板抵抗小型穿甲弹侵彻的理论分析模型．在给定的靶板条件下，该模型可以模拟在冲击载荷作用下的复合靶板的弹道极限速度，并分别对铝板和钢板做背板的复合靶板进行了试验验证；同时，在相同的面密度下，比较了不同背板的抗弹效果，实验结果和数值结果吻合较好．     

冰箱内胆冲孔切边模设计

分析了冰箱内胆安装孔的特点与制作工艺,介绍了冰箱内胆冲孔切边模的结构和设计要点,采用模块化设计,缩短了模具设计时间,提高了设计质量。实践验证:模具结构设计合理,工作平稳、可靠。     

Static research of flow in rotor channels of the regenerator

One demonstrates here the results of static experiments which suggest the pulsating flow in rotating channels of the rotor of heat regenerators occurs. Electrolytic technique was used to measure distribution of the mass transfer coefficient for one of many straight, round, radial ducts of the rotor for different angle positions at mean Reynolds number as a parameter. The use of the Chilton–Colburn analogy made it possible to state the angle-distribution of flow-velocity. The Reynolds number deviation was about ±30% in comparison with its mean value which suggests that the phenomenon should be taken into account in formulating the models of rotary heat exchangers. An equality – approximately – of the mean velocity of an out-gassed electrolyte in the opposite ducts of the rotor of the model, working in a closed hydraulic system, was stated which was justified theoretically for one-dimensional flow.     

皮日休对儒家传统的继承与突破

首先肯定了皮日休对儒家“经世致用”思想的继承，然后分析了皮日休对古文运动的代表韩愈等人“文以明道”观点的发扬，最后着重论述了皮日休通过对统治者的讽刺、鞭挞和对人个体生命的尊重，实现了对儒家中庸思想的突破。     

Development of a new rotary demister

The collection efficiency of a new helicoidal rotary demister, a novel technology for removing persistent fine droplets from gases, was evaluated using a tracer-based method. The demister uses a helicoidal element, which consists of a metal sheet wound as a spiral, designed to rotate at high speed within a cyclone body. Larger droplets are separated as they enter the cyclone housing, while the smaller droplets are carried by the gas into the helicoidal path of the rotating element, where they are centrifuged towards the outer collecting walls and, due to a baffle, flow counter-currently to the gas and are drained out from the bottom of the helicoidal element. The mist-free gas leaves through a channel located at the center of the spiral. The droplets collection efficiency and the pressure drop of the demister were measured under various conditions, to determine the impact of rotation speed and of gas flow rate.     

回转焙烧炉在催化裂化催化剂行业的应用及其结构优化

介绍了回转焙烧炉在催化裂化（FCC）催化剂行业的应用，根据实际应用情况进行了设备结构优化，实现节能降耗，提高产品收率。