灰色关联投影法在公路网综合评价中的应用

在建立用于公路网综合评价指标体系的基础上,论述灰色关联投影法在公路网方案综合评价的应用,并根据实际数据,应用灰色关联投影模型对吉林省各地区2002年现状公路网方案进行评价并排序比较。结果表明,该方法用于公路网综合评价和排序是可行有效的。     

GYK设备V1.1版软件在特殊情况下的控制方式

介绍了GYK设备V1.1版软件在半自动闭塞区段“距离进站信号机小于500m时,机车信号由黄/双黄灯掉白灯再变为红/黄灯、连续进站、连续出站、线路所”等几种特殊情况下的控制方式.     

海军舰船电子装备维修保障系统网络化研究

随着当前网络技术的发展和舰船电子装备维修保障的需求,网络化已经成为海军舰船电子装备维修保障系统的发展趋势和特征。论文就实现海军舰船电子装备维修保障系统的网络体系结构及其所涉及的关键技术进行了详细阐述。     

舰船电子装备的状态监测与故障诊断

现代舰船电子装备迅猛发展,推动了装备检测技术的不但进步。论文从舰船电子装备状态监测和故障诊断维修的特点出发,提出了实现舰船电子装备状态监测和故障诊断技术的基本构想与设计方案以及实现途径,指出了系统的优点与发展方向。     

Solving conformal contacts using multi-Hertzian techniques

Recently, publications aiming at wheel–rail contact surveys let readers think that multi-Hertzian methods present severe drawbacks with respect to ‘virtual penetration’ methods. These surveys criticise multi-Hertzian solutions mainly because presenting ‘larger contacts overlaps’ and ‘frequent secondary contacts near the border of the first contact’, both obvious geometric possibilities of which the practical occurrence and eventual inconvenience would remain purely theoretical unless established over definite methods demonstrating poor practical results. Recent surveys all quote Piotrowski–Chollet 2005 survey of wheel–rail contact models that attempted to illustrate defective multi-Hertzian techniques by concentrating on the method initiated by Sauvage in the 1990s and further developed by Pascal. The 2005 paper not only gives no evidence of practical inconveniences of Sauvage’s method but also confuses static geometric contact overlaps with the dynamical overlapping of forces. In reality it mixes Sauvage method up with a quite different technique. Thus a clarification is now necessary by reminding what the proper Sauvage technique really is and by showing some of its practical successful applications. The present paper, focusing on determination of normal contact forces in conformal situations, intends to explain clearly the advantages of the unequivocal localisation of secondary ellipses in that multi-Hertzian method which has been developed in INRETS VOCO codes in the 1990s and successfully used by SNCF and ALSTOM in the INRETS-SNCF code, VOCODYM, and later in Pascal’s online calculation of railway elastic contacts code. It proved its effectiveness for studying freight wagons derailments as well as rail wear and head-check, unrounded wheels wear, high-speed lines’ deformations or TGV comfort. While simulating American ACELA trainsets’ behaviour on the US North-East Corridor tracks, prior to actual tests, as part of the commercial contract. It has been also a major tool for bringing back together French and American Safety Standards.     

“通程”号超大型耙吸挖泥船开发设计

阐述了708研究所自主开发设计的国内第一艘超大型挖泥船,采用全通甲板,适用于深、远海作业;泥舱舱容达18374m3,最大挖深可达85m,为目前中国设计建造的最大舱容、最大挖深的深水疏浚工程船;疏浚设备(即:泥泵、水下泵、高压冲水泵等)采用全变频电力驱动,泥舱首次采用箱形泥门形式。