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西安地铁5号线地铁车辆牵引系统频繁预充电问题造成正线救援,针对问题深入分析,找出其根本原因是由于司机频繁操作方向手柄导致紧急制动发生,造成预充电故障致使牵引系统停止工作。为此提出车辆电路设计及软件优化方案,通过静态模拟和现场验证,优化效果良好,提高了车辆运营安全可靠性。 相似文献
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[Objectives]Aiming at the current situation in which it is difficult to efficiently evaluate protection probability through traditional lightning rod evaluation methods, an efficient numerical evaluation algorithm is developed on the basis of an electrogeometric model (EGM) and attractive volume to realize the efficient calculation of lightning protection probability at any point in space.[Methods]This method first determines the attractive volume boundary of the lightning rod and protection object according to the interception process of the upward and downward leaders. The collection surface and exposure arc of the lightning stroke distance are then calculated, enabling the attractive risk and interception effect of the lightning rod to be quantified. Finally, the attraction and interception characteristics of the lightning rod are integrated to establish a numerical evaluation model of protection probability. To verify the accuracy of this method, the general rule of lightning rod protection probability is analyzed and the results compared with the existing analysis method.[Result]The evaluation results of this method show good agreement with those of classical leader progression model (LPM) theory.[Conclusions] The method proposed herein has a high degree of quantification and can realize the efficient calculation of lightning protection probability at any point in space, which can provide useful references for lightning protection design work. © 2023 Authors. All rights reserved. 相似文献