隧道施工红外探水干扰分析与预防研究

隧道红外探水预报受多种因素的干扰,其准确性往往受到影响。通过红外探水的原理分析,对广大铁路扩能改造工程祥和隧道进口段进行现场试验,针对每一项影响因素做详细的试验测试,分析发现灯源、初喷混凝土对红外探测造成的影响最大,产生干扰的根本原因是干扰源产生的热量改变了原来的环境温度,并探讨了减小干扰的主要方法:1)探测时选择干扰源最少的时间段;2)若干扰无法避免,可按最高温度为标志点建立干扰温度场,即可明显排除干扰产生的影响;3)探测时应保持在隧道中轴线上,保持接收孔与每一条测线各测点夹角相同。通过以上方法,可以有效提高隧道红外探水的准确性。     

使用氢气作为内陆水路燃料调查研究(英文)

Escalating apprehension about the harmful effects of widespread use of conventional fossil fuels in the marine field and in internal combustion engines in general, has led to a vast amount of efforts and the directing of large capital investment towards research and development of sustainable alternative energy sources. One of the most promising and abundant of these sources is hydrogen. Firstly, the use of current fossil fuels is discussed focusing on the emissions and economic sides to emphasize the need for a new, cleaner and renewable fuel with particular reference to hydrogen as a suitable possible alternative. Hydrogen properties, production and storage methods are then reviewed along with its suitability from the economical point of view. Finally, a cost analysis for the use of hydrogen in internal combustion engines is carried out to illustrate the benefits of its use as a replacement for diesel. The outcome of this cost analysis shows that 98% of the capital expenditure is consumed by the equipment, and 68.3% of the total cost of the equipment is spent on the solar photovoltaic cells. The hydrogen plant is classified as a large investment project because of its high initial cost which is about 1 billion US$; but this is justified because hydrogen is produced in a totally green way. When hydrogen is used as a fuel, no harmful emissions are obtained.     

基于CST的金属腔体电磁环境仿真分析

本文将CST电磁仿真软件应用于金属腔体电磁兼容问题的研究中,利用该软件构建物理模型,并对金属腔体内的电磁环境进行仿真计算。仿真结果与理论计算、实测数据吻合较好,为金属腔体电磁环境的预测和评估提供了有效的依据,可以作为相关工程应用参考。     

基于ANSYS的开关杠杆焊接工艺研究

杠杆在焊接过程中由于温差及焊后冷却方式的不同均会出现不同程度的焊接应力,本文通过ANSYS高斯热源的加载算法对杠杆焊接及焊后冷却方式的不同情况进行数值对比分析,确定合适的焊接工艺参数,形成最优焊接工艺方法指导生产,提高开关焊接质量.     

公路隧道施工中的安全风险评估及防范对策

隧道工程具有施工难度大、隐蔽性、复杂性和不确定性因素多等特点,施工过程中存在巨大的安全风险。按照风险源辨识、风险分析、风险估测和风险控制的流程,以建设中的寨仔山隧道为对象,采用指标体系法进行安全风险总体评估与专项评估。在确定重大风险源后,以矩阵法对重大风险源进行动态估测,并提出风险防范对策,其可为隧道工程安全风险评估与控制提供良好的借鉴。     

谈重大危险源信息管理系统的城市安全控制

本文首先阐述重大危险源的概念,重大危险源系统的组成,然后结合重大危险源信息管理系统,介绍了对重大危险源的辨识和控制技术,以及当危险源事故发生时的事故预案的方法,最后还提出了相关的解决方案。