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全比尺模型试验 1

图像测量技术 1

累积沉降 1

轨道振动 1

道砟颗粒运动 1

高速铁路 1

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Technical feasibility study of an onshore ballast water treatment system

Shengjie LIU, Manxia ZHANG, Xiang LI, Xiaojia TANG, Lingling ZHANG, Yimin ZHU, Chengyu YUAN

《环境科学与工程前沿（英文）》 2011年第5卷第4期页码 610-614 doi: 10.1007/s11783-011-0379-2

摘要： To fulfill the requirements of (G8), a set of onshore ballast water treatment equipment utilizing micro-pore ceramic filtration (MPCF) and UV radiation (MPCF&UV) system was designed and set up with a maximum flow rate of 80 m ·h . Technical feasibilities of MPCF&UV system were evaluated in three areas: removal efficiencies of indicator organism and oceanic bacteria, perdurability of a ceramic filter, and application on native seawater. The results showed that no indicator organism ( ) or oceanic bacteria was detected after treatment of 20 L MPCF and UV radiation at 1.3× 10 μW·s·cm . A 20 L ceramic filter can run continuously for 5.3 h at the flow rate of 15 m ·h before its pressure drop up to 0.195 MPa. The removal percentage of total plankton amounts were 91.9% at a flow rate of 70 m ·h by 80 L MPCF and UV radiation at 1.3× 10 μW·s·cm .

关键词： ballast water ceramic filter UV plankton oceanic bacteria

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基于图像测量技术的高速铁路有砟道床道砟颗粒运动分析 Article

边学成, 蔡文清, 罗政, 赵闯, 陈云敏

《工程（英文）》 2023年第27卷第8期页码 161-177 doi: 10.1016/j.eng.2022.08.006

摘要：

有砟轨道是国内外高速铁路主要轨道形式之一，由级配碎石组成的道砟层在高速列车荷载下会产生比普通铁路更明显的道砟颗粒运动，易于引发过大的道床沉降，对列车安全运行产生不利影响。但由于缺乏有效测量手段和分析方法，道砟颗粒的运动行为研究仍不多见。本课题基于数码相机和图形识别方法，在全比尺模型试验中开发了道砟颗粒运动追踪技术，将1274个道床层表层道砟染色并设定为追踪目标；在试验中以垂直向下的角度陆续拍摄道砟层照片，通过追踪目标显示的像素变化特征，对表层道砟颗粒运动进行追踪，定量地分析了不同列车速度和轴重工况下道砟颗粒的运动行为。试验结果表明：表层道砟颗粒运动在低速列车荷载作用下较微弱且主要集中于轨枕附近，但当列车时速提升至360 km时，道砟运动明显加剧并扩展至整个道床层；此外，经统计发现道砟颗粒位移和旋转的发展规律类似；轨道振动会诱发道砟颗粒运动，竖向加速度和水平加速度分别是轨道中心和轨道边缘附近道砟颗粒运动产生的主要原因。道砟颗粒运动和轨道沉降在长期加载中的发展趋势相似，两者同时达到稳定状态；轨道服役性能（如振动特性、累积沉降与轨枕支承刚度）在高速列车荷载的长期作用下会部分劣化，其与道砟颗粒流动的方向和分布密切相关。

关键词：高速铁路全比尺模型试验图像测量技术道砟颗粒运动轨道振动累积沉降

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Flexible resonant tank for a combined converter to achieve an HPS and LED compatible driver

Jin HU,Hui-pin LIN,Zheng-yu LU,Feng-wu ZHOU

《信息与电子工程前沿（英文）》 2015年第16卷第8期页码 679-693 doi: 10.1631/FITEE.1500054

摘要： High pressure sodium (HPS) lamp has been widely used in street lighting applications because of its maturity, reliability, high lighting efficiency, long life-time, and low cost. Light emitting diode (LED) is expected as the next generation lighting source due to its continuously improving luminous efficacy, better color characteristic, and super long life-time. The two lighting sources may coexist in street lighting applications for a long time. A novel HPS and LED compatible driver is proposed which is rather suitable and flexible for driving HPS and LED in street lighting applications. The proposed driver combines the LLC and LCC resonant circuits into a flexible resonant tank. The flexible resonant tank may change to LLC or isolated LCC circuit according to the lighting source. It inherits the traditional HPS and LED drivers’ zero voltage switching (ZVS) characteristics and dimmable function. The design of the proposed flexible resonant tank considers the requirements of both HPS and LED. The experiments of driving HPS and LED on a prototype driver show that the driver can drive the two lighting sources flexibly with high efficiency.

关键词： High pressure sodium (HPS) Light emitting diode (LED) Compatible driver Ballast