TMIS应用数据转换工具的设计

根据ＴＭＩＳ的需求，给出了应用数据转换工具系统的总体结构，并在应用环境中实现了该系统。本数据转换系统具有较好的通用性，实时性，可用性，完全可满足ＴＭＩＳ应用的要求。     

Lightweight mixture faults detection method for gasoline engine using on-line trend analysis

Mixture faults detection is meaningful for gasoline engines because proper mixture is the basic prerequisite for healthy running of a combustion engine. Among existing methods for faults detection, the data-driven trend analysis technique is widely used due to the simplicity and efficiency in time-domain. The CUSUM (Cumulative Sum Of Errors) algorithm is good at real-time trend extraction, but it’s easy to be costly on the fuel trim signal during the engine in normal working conditions, which will increase battery energy consumption because engine failure is rarely occurs. Hence, the conventional treatment methods of artifacts in the CUSUM algorithm are modified by means of decay function and detection time analysis. The thresholds are tuned according to the characteristics of artifacts instead of residual variability, which leads to better results of trend extraction and less computation. Then, the revised CUSUM algorithm is used for monitoring the mixture abnormal behaviors, and the mixture faults can be detected in real time through analyzing the variation features of fuel trim signal. The lightweight faults detector using the advanced CUSUM algorithm (FD-A-CUSUM) is evaluated on the experimental data collected from a Ford engine. The validation results show that while engine works under normal conditions, the computation of FD-A-CUSUM has decreased by 72.79 % in comparison with the detection method using the original CUSUM algorithm (FD-O-CUSUM), and the false alarm ratio of FD-A-CUSUM is 3.37 %. Futhermore, the detection results of FD-A-CUSUM for two leakage faults have achieved 91.18 % test accuracy.     

提高通信设备供电系统质量的措施

介绍了提高铁路通信设备系统质量的措施及其效果。     

知识管理研究

知识管理是知识经济时代政企单位运作的主要管理体系和管理工具。本文结合大型企业综合信息系统设计实践经验，针对我国目前政府和企业信息化建设现状，对知识管理系统建设过程中的一些问题，提出了几点初步的设想。     

Numerical method for simulating tire rolling noise by the concept of periodically exciting contact force

For the numerical simulation of tire rolling noise, an important subject is the extraction of normal velocity data of the tire surface that are essential for the acoustic analysis. In the current study, a concept of periodically exciting contact force is introduced to effectively extract the tire normal velocity data. The ground contact pressure within contact patch that is obtained by the static tire contact analysis is periodically applied to the whole tread surface of stationary tire. The periodically exciting contact forces are sequentially applied with a time delay corresponding to the tire rolling speed. The tire vibration is analyzed by the mode superposition in the frequency domain, and the acoustic analysis is performed by commercial BEM code. The proposed method is illustrated through the numerical experiment of 3-D smooth tire model and verified from the comparison with experiment, and furthermore the acoustical responses are investigated to the tire rolling speed.     

强基固本筑牢公交发展根基

“基础不牢，地动山摇”。没有强有力的基层就难以落实好各项工作。新时期，要推进公交企业持续健康发展，必须本着继承与创新相结合原则，通过抓基层、打基础、苦练基本功，真正增强基层实力，提高队伍素质，提升管理水平。近年来，大庆油田公共汽车公司继承发扬大庆精神、铁人精神，坚持从公交行业特点和企业实际出发，创新工作，强基固本，着力加强基层文化建设、队伍建设和机制建设，全公司基层建设整体水平不断提高，公司先后荣获“全国职业道德建设十佳单位”、“全国城市公共交通文明企业”和“全国建设系统企业文化建设先进单位”等荣誉称号。     

Feasibility study for the application of air inflated membrane structure in China National Stadium

China National Stadium, also known as “Bird’s Nest”, is the main stadium of the 29th Olympic Games in Beijing in 2008, which has successfully held not only the Opening and the Closing ceremonies but also the track and field events. A new problem of rain preventing is brought out to improve the utilization of the Bird’s Nest after the Olympic Games. The scheme of installing an air inflated membrane at the opening of the steel structure is proposed in this paper to solve the rainproof problem of the Bird’s Nest. The form-finding and mechanical analyses of the air inflated membrane are carried out. Comparison between the mechanical performance and dynamical character before and after installing the air inflated membrane structure is given. To verify the analysis results, based on the practical structure of the Bird’s Nest, a test of a 1:20 model membrane is worked out.     

在R＜250m小半径曲线上铺设特种混凝土轨枕

金城江工务段管辖的黔桂线金城江～麻尾区段,地处桂西北山区,系解放前修建的一条技术标准极低的山区铁道线,沿线山峦起伏,线路沿山盘绕.全长151.6km正线中,共有曲线302个,其中半径≥250m的曲线有170个;半径＜250m的曲线有132个,延长78.8km,占正线全长52.0%;曲线最小半径为175m……     

施工风险管理的探讨

通过对施工风险及管理的阐述,提出施工风险管理中应注意的问题,并说明将风险管理理论和方法引入工程施工中的可行性.