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一种基于非均匀有理B样条曲线和Kriging模型的钢轨打磨廓形预测方法 预览
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作者 杨岳 丘文生 +2 位作者 曾威 解欢 谢素超 《中南大学学报:英文版》 SCIE EI CAS CSCD 2018年第1期230-240,共11页
铁路钢轨打磨可以改善车辆运行质量,延长钢轨使用寿命。为了保证钢轨打磨后可以获得预定的打磨目标廓形,需要在打磨之前对钢轨打磨廓形进行预测,为打磨施工中打磨模式的优选提供依据。本文设计了一种基于NURBS-Kriging模型的钢轨打... 铁路钢轨打磨可以改善车辆运行质量,延长钢轨使用寿命。为了保证钢轨打磨后可以获得预定的打磨目标廓形,需要在打磨之前对钢轨打磨廓形进行预测,为打磨施工中打磨模式的优选提供依据。本文设计了一种基于NURBS-Kriging模型的钢轨打磨廓形预测方法,实现了不同打磨模式下钢轨打磨廓形的预测。具体包括:考虑磨损钢轨断面廓形为自由曲线,应用三次NURBS曲线构建了钢轨廓形的参数化模型;基于三次NURBS曲线面积精算公式,设计钢轨打磨量的计算模型;为预测单个砂轮的打磨量,将钢轨断面打磨面积作为打磨量衡量指标,以打磨角度、打磨压力和打磨速度三个打磨参数为变量,以打磨面积为响应量,构建单砂轮打磨量的Kriging模型;根据钢轨打磨顺序成形原理,提出基于NURBS-Kriging模型的钢轨打磨廓形预测方法,并通过工程应用验证了该方法的有效性。 展开更多
关键词 钢轨打磨 非均匀有理B样条(NURBS)曲线 KRIGING 磨损钢轨 目标廓形
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Multi-Objective Optimization of Rail Pre-Grinding Profile in Straight Line for High Speed Railway
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作者 曾威 丘文生 +2 位作者 任涛 孙文 杨岳 《上海交通大学学报:英文版》 EI 2018年第4期527-537,共11页
Causes, effects and control of seasonal frost action in railways 预览
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作者 Antti Nurmikolu Mika Silvast 《寒旱区科学:英文版》 CSCD 2013年第4期363-367,共5页
Seasonally cold climate and resulting frost action set great demands to railway track substructure in order to maintain track geometry. Challenges culminate on high-speed lines, where the tolerances for roughness are ... Seasonally cold climate and resulting frost action set great demands to railway track substructure in order to maintain track geometry. Challenges culminate on high-speed lines, where the tolerances for roughness are the tightest. Problems may result in highly increased track maintenance and need for temporary speed restrictions. The causes of frost action can be associated with subsoil, subballast or ballast. The major concern in frost protection is to avoid the freezing of frost susceptible subsoil by using sufficient thickness of subballast and relying on non-frost-susceptible subballast material. This paper provides an overview of the main research findings on the role of ballast, subballast and subsoil in frost action. In new construction the material specifications, design procedures and construction methods have been developed to ensure adequate performance of track substructures, but special challenges exist in managing existing tracks that were not designed for modern requirements. In order to perform cost-effective and sustainable track maintenance, it is necessary to recognize the problem areas and define the root-causes of problems. For locating the problem sections and defining the causes of defects, a sophisticated analysis based on integration of track geometry and ground penetrating radar (GPR) data has been developed and is summarized in this paper. 展开更多
关键词 季节性冻土 原因 铁路 控制 轨道维修 设计程序 调制解调器 下部结构
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Microstructure-Fatigue Crack Propagation Kinetics Relationships of Rail Steels 预览
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作者 Heshmat A. Aglan Mahmood Fateh 《土木工程与建筑:英文版》 2010年第9期 1-12,共12页
关键词 疲劳裂纹扩展 微观结构分析 钢轨钢 动力学 奥氏体锰钢 贝氏体钢 珠光体钢 电火花加工
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