漯河市泰山路沙河大桥病害成因及加固

该文以漯河市泰山路沙河大桥为例,针对中承式拱桥在运营十多年后,出现的各类病害进行分析,及加固处理。     

浅谈摩托车减震器油封与防尘封的匹配

防尘封对油封有正负两方面的作用,因此有必要对油封和防尘封进行匹配使用。通过产品结构和橡胶的改进,减小油封与连杆之间的摩擦力,在减震器连杆上形成尽可能薄的油膜,避免被防尘封刮去;增加防尘封的防尘能力,在薄的油膜条件下,避免假性漏油的产生。通过油封与防尘封匹配耐久漏油试验及耐久泥水试验,选出匹配效果最佳的油封与防尘封,并按此种匹配进行生产。     

发展轻轨交通的意义与操作方法

结合我国城市的一般现状，分析了发展城市轻轨的意义，介绍了建设城市轨道交通的几种观念和资金来源，并对此提出了建议。     

武荆高速公路桥梁优化设计

通过对高速公路桥梁的优化设计,提出在平原路段缩孔的原则,即将桥台从地质不良或较差的地段移至地质良好或较好地段;在微丘路段应选择地势平坦的位置设置新桥台,确保桥台稳定性,以路代桥;淤泥质粘土或淤泥质亚粘土的软基地段桥头填土高度不超过6.5 m.地质良好地段不超过9 m.实践证明其优化设计技术可行,经济最优.     

An improved model updating method of reduced-models for finite element model

Most of exiting model updating methods based on the substructure matrices did not consider the effect of model reduction process on model updating which led to the updating results could not become more and more accurate with the improvement of the model reduction precision and the convergence rate was greatly reduced. In order to solve this problem, this paper analyses the basic reason about this problem, and proposes an improved model updating method of reduced-models, named as improved reduced cross-model cross-mode (IRCMCM) method. The proposed method eliminates the disadvantageous effect by adding a correction term to the model updating formula and employing an iterative process. The results obtained by the referenced method and IRCMCM method are compared by numerical examples of satellite’s plates, which indicate the model updating results are more accurate by using the proposed method, and the model updating precision becomes better with the precision of the model reduction upgraded and the convergence rate is improved to a large extent at the same time.     

对集装箱堆场消防设计的建议

通过对集装箱堆场水消防系统设计的分析,结合工程实例,对集装箱堆场消防设计优化提出建议。     

Orders of Automorphism Groups of the p~6 Groups of Family Φ_(24)

Using the metabelian property, regularity, p-commutativity and some properties of congruence, this paper gave the orders of automorphism groups of family Φ24, which are the groups of order p6 determined by Rodney James, where p denotes an odd prime.     

南水北调东线分流区通航水流条件及改善措施

采用平面二维水流数学模型,对南水北调东线某工程调水分流区通航水流条件进行了计算分析,提出了改善通航水流条件的方案.计算结果表明,现状条件下分流区通航水流条件不能满足规范要求,方案2通过扩挖金宝河及分流区南侧对回流区和横向流速的改善效果较好,推荐其作为工程改善措施.     

动车空心轴探伤设备存在的问题及措施和建议

高速动车组普遍采用空心轴，对空心轴探伤质量的好坏将直接影响动车的安全。介绍了目前空心轴探伤设备存在的主要问题，提出了解决措施和建议。