UM71无绝缘轨道电路的调试及联锁关系

介绍UM71模拟电路的制作过程,设备调试步骤,并举例说明联锁试验的技术条件,区间信号联锁的相互关系.     

海底犁式挖沟机犁体曲面优化设计(英文)

The plow of the submarine plowing trencher is one of the main functional mechanisms, and its optimization is very important. The design parameters play a very significant role in determining the requirements of the towing force of a vessel. A multi-objective genetic algorithm based on analytical models of the plow surface has been examined and applied in efforts to obtain optimal design of the plow. For a specific soil condition, the draft force and moldboard surface area which are the key parameters in the working process of the plow are optimized by finding the corresponding optimal values of the plow blade penetration angle and two surface angles of the main cutting blade of the plow. Parameters such as the moldboard side angle of deviation, moldboard lift angle, angular variation of the tangent line, and the spanning length are also analyzed with respect to the force of the moldboard surface along soil flow direction. Results show that the optimized plow has an improved plow performance. The draft forces of the main cutting blade and the moldboard are 10.6% and 7%, respectively, less than the original design. The standard deviation of Gaussian curvature of moldboard is lowered by 64.5%, which implies that the smoothness of the optimized moldboard surface is much greater than the original.     

黑色路面早期损坏原因

最近，我们对安徽省滁州市所辖干线公路面层质量进行了考察，发现部分黑色路面面层出现早期剥落、开裂、松散、软弹等。经就地取样试验分析，发现造成早期损坏的原因主要包括材料、级配、油石比、混合料温度等几个方面。１材料的选用在１０４国道滁州段已损坏的面层取样分...     

用等效惯矩法计算铁路轻型桥墩的B值

某些形式的轻型墩的横向宽度不能直接量取,因此可以虚拟一实体墩,以建立虚拟实体墩与轻型墩的惯性矩等量方程,解出虚拟实体墩的横向宽度,并以此做为轻型墩的横向宽度,计算出墩顶横向振幅及桥墩横向自振频率通常值。     

历尽艰险话桥检

依旧时习俗,人们把医生称作“郎中”。如今则心系敬仰地把他们比作是“白衣天使”,从中道出了这份工作的圣洁和人们对救死扶伤的希冀。 而桥梁检定队被称作是为桥梁诊病的“郎中”。可是这一“郎中”却全无彼一“郎中”的从容和翩翩风度。医生为患者诊病,或是     

论绿色道路施工

基于可持续发展思想，提出了绿色道路施工的模式，阐述了该模式的目标，贯穿的过程及其包含的主要内容。     

久旱之年忧洪水

“宜未雨而绸缪,勿临渴而掘井。”这是我国古老的谚语。当前我国经济建设呈现腾飞之势,铁路基建也是勃勃生机。京九、宝中、兰新等铁路干线如遍地春笋,铁路网络把东西南北交织汇通。神思未来的铁路版图,你自可领略毛泽东所说的“坐地日行八万里”的那种欣喜。但是欣喜之余,切要沉静深思:前年     

山区公路线形设计因素分析

结合实地勘测情况,指出山区公路实地定线应遵循的原则,根据不同情况,综合考虑各种因素,科学合理确定路线方案。现有的山区公普遍存在技术等级低、行车安全性差等弊端。     

黄海DD6118S系列客车散热器导流仓改进设计

分析了现有散热器导流仓结构对客车冷却系统产生的影响及不足,提出了DD6118S系列客车导流仓结构的改进方案.