碎裂岩质高边坡锚杆应力的监测分析

高边坡的现场监测是一个系统工程,文章以西攀高速公路为例,结合高边坡施工期监测锚杆的应力状态和受力原因,建立锚杆应力测值统计模型,分析了开挖、温度、时效变形这三种因素对锚杆应力影响的规律,并对锚固效果和边坡稳定性进行了评价。     

桥梁受船只撞击的安全稳定性计算判别模式

桥—船相撞是困扰工程界已久的复杂灾害性问题,虽然其发生频率较低,但一旦出现即会带来桥梁或船只的损伤甚至毁灭。现有对这一问题的理论分析和处理手段还很不完善。针对这一严峻现实,在前人已有成果的基础上,探讨了桥梁抗撞稳定性判别模式。     

从结构设计的角度分析桥头跳车的影响和防治

桥头跳车对桥梁的振动影响,通过分析得知其结果会导致桥梁结构冲击系数增大,为了有效控制这种影响,本文在桥梁设计、搭板设计、软基沉降等方面加以阐述防治桥头跳车的相关措施。     

超大型矿船定点抛锚的方法和技巧

超大型矿船由于惯性大,受到的风、流影响也大,靠泊难度大。为保证大型矿船安全靠泊,采用定点抛锚。分析超大型矿船的操纵特性,结合抛锚过程中外界因素的影响,论述超大型矿船定点抛锚的方法和技巧。     

基坑宽度效应对坑底隆起的影响研究

该文通过不同宽深比基坑坑底隆起的数值模拟,分析了基坑宽度效应对坑底隆起的影响.研究揭示了不同宽深比基坑坑底隆起变形的规律,表明随着基坑宽深比的不断增加,坑底最大降起量不断增大.结合上海东西通道上跨地铁二号线的工程实例分析,指出对环境保护要求极高的宽大基坑,可通过将大基坑划分为小基坑的方式有效地控制坑底隆起.     

Active yaw damper for the improvement of railway vehicle stability and curving performances: simulations and experimental results

To further increase passenger train comfort and handling performances, a mechatronic approach to the design of railway vehicles is necessary. In fact, active systems on board a railway vehicle allow to push design barriers beyond those encountered with just passive systems. The article deals with the development of an electro-mechanical actuator to improve the running behaviour of a railway vehicle, both in straight track and curve. The main components of the active system are a brushless motor and a mechanical transmission, used to apply a longitudinal force between the carbody and the bogie of the vehicle. The actuator is operated in force control. Different control strategies were developed for straight track running, where the aim is to increase the vehicle critical speed, and for curve negotiation, where the goal is to reduce the maximum values of track shift forces. A mathematical model of the railway vehicle incorporating the active control device has been developed and used to optimise control strategies and hardware set-up of the active device and to estimate the increase in operating performances with respect to a conventional passive vehicle. The active control device has then been mounted on an ETR470 railway vehicle, and its performances have been evaluated during in-line tests in both straight and curved tracks.     

鹤大高速公路桥头跳车的处治和体会

对高速公路容易产生的桥头跳车现象进行分析,提出桥头跳车防治措施,介绍鹤大高速公路桥头跳车处治的施工过程。     

色彩在船舶上的应用与安全

船舶上的色彩应用会直接影响海员的情绪、情感,进而影响到海员的身心健康和工作效率。分析和研究色彩的特性,将有利于揭示色彩与环境以及色彩与情绪、行为的关系,为色彩设计提供依据,给海员一个温馨的生活和安全的工作环境,以消除色彩搭配不当对海员造成的不良影响,减少人为因素导致的海上事故的发生。     

船舶润滑油和液压油水分现场测量研究

文章通过比较油液水分测量的几个国家或行业标准,分析了油液水分现场测量的5种方法,所采用的热板气泡法可现场有效判别含水量大于0．1％的油液。     

30 000 DWG散货船码头系泊模型试验研究

对30 000 DWG散货船在开场水域码头系泊开展了模型试验研究。在风浪流组合工况中,对不同系泊方式的系缆张力和船舶运动进行了分析。分析结果表明,流向和缆绳长度对系缆张力有显著影响。试验结果可为类似船舶码头安全系泊提供重要技术参考。