基于工作分解结构法的高铁研发试验工程装备采购管理实践

中国标准高速动车组及高铁关键装备研发试验工程项目是一项典型的涉及多系统、多目标、多阶段的大型项目。从介绍项目特点入手,分析项目装备采购管理主要影响因素,系统、全面地提出基于工作分解结构法的项目装备采购管理方案。结合项目装备采购管理实践,介绍项目构成、组织、任务、进度、质量和经费共6个方面的分解结构,提出关于质量、进度和经费控制的管理措施或对策。构建的装备采购管理体系,可为类似大型工程项目装备采购实施提供借鉴。     

Modeling commuting mode choice jointly with work start time and work duration

This paper presents a joint trivariate discrete-continuous-continuous model for commuters’ mode choice, work start time and work duration. The model is designed to capture correlations among random components influencing these decisions. For empirical investigation, the model is estimated using a data set collected in the Greater Toronto Area (GTA) in 2001. Considering the fact that work duration involves medium- to long-term decision making compared to short-term activity scheduling decisions, work duration is considered endogenous to work start time decisions. The empirical model reveals many behavioral details of commuters’ mode choice, work start time and duration decisions. The primary objective of the model is to predict workers’ work schedules according to mode choice, which is considered a skeletal activity schedule in activity-based travel demand models. However, the empirical model reveals many behavioral details of workers’ mode choices and work scheduling. Independent application of the model for travel demand management policy evaluations is also promising, as it provides better value in terms of travel time estimates.     

Contrastive Analysis of Working Face Stability in Cases of Climbing Excavation and Horizontal Excavation北大核心CSCD

Restricted by site and construction period of ancillary structure of metro project, climbing excavation is often adopted. In order to determine tunnel face’s stability, the stabilities of working face in the cases of climbing ex- cavation and horizontal excavation were analyzed by theoretical analysis and numerical simulation. With upperbound limit analysis, the affected scope and positions of failure zone were compared; the position of equivalent strain zone and the law of horizontal displacement changes were studied by simulation analysis. The results show that the scope of failure zone caused by climbing excavation was slightly larger than that by horizontal excavation and the po- sition of affected zone is slightly lower than that by horizontal excavation; the horizontal displacement caused by climbing excavation within a scope of 0-1/3 height of tunnel face is slightly larger than that by horizontal excavation while it is slightly smaller beyond the scope of 0-1/3 height of tunnel face; the maximum horizontal displacements in the cases of climbing and horizontal excavation both occur at the place where is 1/3 height of work face and the de- formation of work face in the case of climbing excavation is not larger than that of horizontal excavation; the work face stabilities are mostly the same in the cases of climbing and horizontal excavation without regard to advanced support, and the work face stability is to be guaranteed with proper advanced support. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

系三点式安全带驾驶员手伸及界面分析

考虑驾驶员系三点式安全带,根据运动学、驾驶舒适性和车辆安全性建立了基于铰链转动极限的4自由度手臂运动学模型,提出了雅克比奇异性的奇异表面的识别方法,并得出了系三点式安伞带驾驶员手伸及界面的解析解,利用可视化技术对驾驶员手伸及界面进行了可视化处理。     

西延高速铁路引入西安铁路枢纽方案研究

在国家中长期铁路网规划中西安铁路枢纽具有重要的地位。为研究其空间布局优化问题,首先研究枢纽客运布局,缺少衔接南北向高速铁路的主客运站。其次西延高速铁路、西渝高速铁路引入西安铁路枢纽宏观走向方案,综合比较后建议采用城市东侧布线方案,银西高铁与西武高铁也从枢纽东侧连接贯通;再次研究枢纽内主要客运站布局和分工,西安北承担东西向始发和通过动车作业,西安东调整为主客运站,承担南北向的始发和通过动车作业;最后研究南北向高铁引入西安东站后,还应设置引入西安北站、西安站的联络线。结果表明:西安铁路枢纽内各条线路间互连互通、运输效能可以得到有效发挥。     

CO2 emissions correction of light-duty vehicles based on an energy deviation analysis method

In present study, a total of 3 types of light-duty vehicles were tested for 7 types of driving modes by using a vehicle dynamics-based simulation method. Deviations between the target and actual test vehicle speed and inaccurate chassis dynamometer road load settings are selected as the two main factors affecting the CO₂ emission measurement test. 126 cases of simulations were conducted to analyze the effects of the deviation between the target and actual test vehicle speed on CO₂ emissions and 63 cases of simulation were conducted to analyze the effectiveness of inaccurate road load test conditions on CO₂ emissions. Then, the CO₂ correlation method proposed by World Forum for Harmonization of Vehicle Regulations (WP.29, UN) was applied for simulated results in original simulation cases, and a correction to performance was validated by comparative analysis. From the simulation results, it is revealed that velocity and road load deviation are related to distinct changes in fuel efficiency and CO₂ emission rates of test vehicles. Also, it is revealed that CO₂ correction method show good performance to reduce the relative error lower than 2% in all test cases.     

浅析高速公路建设企业如何做好新闻宣传工作

文章基于高速公路建设发展实际,分析了新闻宣传工作在提升高速公路建设企业软实力中的重要作用,指出新闻宣传工作必须做到"快、准、宽、精"四字要诀,阐述了做好高速公路建设新闻宣传策划工作的具体思路。     

浅谈船舶驾驶人员工作责任心的培养

一个人如果没有责任心,就没有工作激情和动力。责任心体现在对本职工作的高度负责上,身处什么样的岗位,就必须尽好什么样的职责。本文根据作者多年的航海工作经历和高校教学经历,就如何培养船舶驾驶员的工作责任心进行粗浅的探讨。     

论新时期铁路局技术监督工作

阐述新时期铁路局技术监督工作在标准化管理、计量管理和质量管理3个方面的关键点，提出新时期铁路局技术监督工作的实施建议。     

铁通江西分公司办公自动化系统的设计与实现

为了提高办公效率、加强省公司和市分公司的信息沟通，综合现代的数据库技术和计算机控制技术，采用B／S（浏览器／服务器）的模式，提供了一整套的办公自动化管理系统解决方案。文章简要介绍了该系统的功能和结构，并对其中的部分关键技术问题进行了详细的阐述。