山地齿轨交通系统试验线总体设计

齿轨交通是一种在传统轮轨系统走行结构中增加齿轮-齿轨传动系统的创新轨道交通系统。该系统可解决大坡度线路适应性问题,提高山区、丘陵等复杂地形地貌环境轨道交通选线的灵活性,充分满足山地旅游轨道交通需求,应用前景广泛。为满足齿轨交通系统商业应用前的车辆性能及关键工程技术验证,建设一条山地齿轨交通系统试验线,最大坡度达120‰。通过详细介绍该试验线的建设情况、试验列车概况、试验需求分析、总平面设计,以及轨道、路基、工艺、供变电、附属试验设施等主要工程内容,可为类似项目提供参考。     

Reliability analysis of electrical system of computer numerical control machine tool based on bayesian networks

The core of computer numerical control (CNC) machine tool is the electrical system which controls and coordinates every part of CNC machine tool to complete processing tasks, so it is of great significance to strengthen the reliability of the electrical system. However, the electrical system is very complex due to many uncertain factors and dynamic stochastic characteristics when failure occurs. Therefore, the traditional fault tree analysis (FTA) method is not applicable. Bayesian network (BN) not only has a unique advantage to analyze nodes with multiply states in reliability analysis for complex systems, but also can solve the state explosion problem properly caused by Markov model when dealing with dynamic fault tree (DFT). In addition, the forward causal reasoning of BN can get the conditional probability distribution of the system under considering the uncertainty; the backward diagnosis reasoning of BN can recognize the weak links in system, so it is valuable for improving the system reliability.     

基于向量范数的公交场站布局方案评价

针对目前公交场站布局规划方案评价多采用模糊综合评价的方法所缺乏客观性的问题,提出一种基于希尔伯特空间向量范数的公交场站布局方案评价模型。首先构建公交场站布局方案评价指标体系,而后对定量、定性指标进行量化处理,最后运用空间向量泛数对评价值予以分析计算,并通过偏导计算求得各指标的弹性因子,用以反映各指标对总体方案的影响度。运用该评价模型对成都市公交场站布局规划实例进行试算,结果一致,证明方法可行。