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A Rogowski coil was designed to measure partial discharge (PD) signal with low currents and high frequency. The possibilities of obtaining better measurements of PDs were explored by changing the inductance, mutual inductance, resistance, and capacitance of the coil. The designed Rogowski coil was calibrated under square wave voltage and arbitrary sine wave voltage. Then, according to the parameters of the Rogowski coil, the effect of changing some of these variables was simulated using a bode plot. Compari... 相似文献
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广深铁路桥桩基托换施工技术 总被引:5,自引:2,他引:3
李彦明 《铁道标准设计通讯》2004,(5):47-50
针对具体工程 ,介绍暗挖隧道穿越铁路桥进行桩基托换施工技术 ,为在复杂施工环境和复杂地质条件下 ,进行既有铁路桥梁的桩基托换和承载力的转换积累了宝贵的经验 相似文献
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为解决231A_4G型化油器在不稳定工况下存在的问题,采用了一种化油器附加控制系统.介绍了该系统的结构与效果. 相似文献
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用脉冲波形的宽带检测及分类技术解决常规局部放电检测系统难以处理的多局部放电源和抑制随机干扰脉冲信号问题.针对在局部放电检测中的某些特殊工况,给出了提高检测系统分类性能的方法——基于波形峰值.时间序列的阈值判别法、基于小波软阈值的脉冲波形去噪法以及基于脉冲波形二维特征平面的极限坐标分类法.局部放电试验结果表明,提出的方法在直流下可提高宽带检测系统的分类性能. 相似文献
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李彦明 《交通世界(建养机械)》2014,(23):100-101
近年来,随着经济全球化的发展,我国路桥软土路基施工质量已得到很大提高,但是难免还会存在不足之处,若是没有得到有效解决,则会影响到整个工程的施工质量,同时也将阻碍我国建筑企业的长期发展,掌握好路桥施工中软土路基施工技术是关键。 相似文献
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Vehicle traveling time prediction is an important part of the research of intelligent transportation system. By now, there have been various kinds of methods for vehicle traveling time prediction. But few consider both aspects of time and space. In this paper, a vehicle traveling time prediction method based on grey theory (GT) and linear regression analysis (LRA) is presented. In aspects of time, we use the history data sequence of bus speed on a certain road to predict the future bus speed on that road by GT. And in aspects of space, we calculate the traffic affecting factors between various roads by LRA. Using these factors we can predict the vehicle's speed at the lower road if the vehicle's speed at the current road is known. Finally we use time factor and space factor as the weighting factors of the two results predicted by GT and LRA respectively to find the fina0l result, thus calculating the vehicle's travehng time. The method also considers such factors as dwell time, thus making the prediction more accurate. 相似文献
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李彦明 《交通世界(建养机械)》2014,(26):83-84
近几年来,随着我国社会经济的快速发展,我国的交通行业也得到了一定发展,钻孔灌注桩技术在交通建筑工程的应用也已越来越广泛,钻孔灌注桩技术施工的过程中具有一定的隐蔽性,这就要求施工的过程中必须科学而有效的方法,此外,相关的施工人员必须具备一定的专业水平及责任心,这样才能在最大程度上避免工程在施工的过程中出现埋钻、钻孔倾斜、断桩以及坍塌等现象,从而使工程的整体质量得到有效保证。 相似文献
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