基于地源热泵的高速道岔融雪系统设计研究

道岔融雪系统对于铁路列车运行安全和效率具有重要意义。针对目前我国铁路线路普遍安装使用的电加热道岔融雪设备存在的缺陷和不足,提出一种新型的基于地源热泵技术的高速铁路道岔融雪系统。该系统是将地源热泵和铁路道岔融雪相结合的一种更节能、环保、有效的用能方式。通过对道岔融雪耗能和热流体传热基本性能的分析研究,提出系统设计的常规方法,为铁路道岔融雪新技术的研究与应用提供新思路。     

华北丘陵区某隧道岩溶发育特征及处理措施研究

以华北丘陵区某岩溶隧道为例,为探明该隧道岩溶发育规律及成因,并据此提出具体的施工处治措施。对该隧道工程地质及水文地质特征进行综合分析,并在勘测及施工期间进行地质测绘、超前地质预报及地质雷达等一系列工程地质和物探工作。结论:该隧道岩溶为地下水沿裂隙溶蚀形成的竖向为主、弱发育、裂隙型无充填物岩溶;探地雷达及超前水平钻相结合的超前预报对隧道岩溶探测效果良好有效;采用"超前预报、注浆固结、超前支护、堵排结合、加强监测"等手段,对不同位置不同类型的溶腔进行针对性处理,现场显示处治措施效果良好。     

长沙磁浮快线低置结构关键技术标准优化研究

长沙磁浮快线低置结构技术标准主要包括轨道梁结构和路基工程两方面内容,其中轨道梁的梁型、防错台构造、垫层以及路基工程的路基面宽度、基床厚度、线间排水等关键技术标准存在一些问题,主要表现为存在技术缺陷、设计偏于保守、工程投资偏高等。针对这些问题进行理论分析和研究,并提出优化措施。研究成果及结论为:(1)低置结构轨道梁宜采用U形梁,轨道梁节间伸缩缝处宜采用传力杆防错台措施,轨道梁基底宜设置碎石垫层,施工时可掺5%水泥填筑;(2)路肩宽度一般取为1.5 m,当两侧路肩有信号灯等站后设备时,可局部加宽路基面;(3)路基基床厚度可采用1.8 m,其中基床表层厚度为0.3 m,基床底层厚度为1.5 m;(4)线间汇水宜利用轨道梁上部梁体的节间缝进行排水,同时线间回填层顶面应做好防排水措施。     

地铁折返道馆故障处理时行车组织方案探讨

道岔是用于列车转线的重要轨道设备,也是轨道上的薄弱环节。正线上的道岔一旦发生故障,将对地铁正常运行、折返作业造成很大影响,会降低地铁运营的效率和质量。文章结合西安地铁2号线一期线路情况,探讨地铁折返道岔故障处理及行车组织调整方案,提出处理流程和行车组织中的关键点。     

铁路道口预警安全系统在徐沛铁路中的应用

铁路道口预警安全系统是由中央处理系统、机车移动信息终端、地面无源应答器、道口监控和无线传输网络组成。介绍道口监控和无线网络传输的工作原理,以及在徐沛铁路的具体应用和效果。     

Motion cueing in high-performance vehicle simulators

The majority of motion cueing algorithms have been developed for passenger car applications, with correspondingly less research dedicated to race-car and high-performance vehicle simulators. In the high-performance context, the focus is on cueing the vehicle's behavioural and handling characteristics, particularly when driving near the limits of performance. In race-car simulators the cueing requirements are therefore quite different, with the problem made all the more challenging by the presence of large accelerations. To understand the drivers' cueing needs, the vehicle's stability and handling response characteristics must be examined near the performance boundary. Frozen-time eigenvalue analyses are used to determine stability and response characteristics across all vehicle operating conditions, including accelerating and braking under cornering, with the results used to determine motion cueing algorithm requirements. Lateral acceleration and yaw cueing filters are designed in order to retain information critical to understanding the vehicle's behaviour on its performance boundary. Cueing filters are then tested, with the help of a professional race-car driver, and are found to provide the cues necessary for the driver to control the vehicle on the limit of performance.     

驾驶员PO预瞄模型参数的时域辨识

本文通过斜坡响应不变法实现离荼到连续传递函数间的转换，运用Ｍａｒｑｕａｒｄｔ阻尼最小二乘法辨识驾驶员ＰＯ预瞄模型的物理参数。辨识结果中，当信噪比为２０ｄＢ、４ｄＢ时，最大偏差分别为１．６％及１０％，从而表明斜坡响应不变法具有很高的辨识精度，且因采用阻尼最小二乘法致使物理参数识精度进一步提高。     

Development of a generalised equivalent estimation approach for multi-axle vehicle handling dynamics

This paper devotes analytical effort in developing the 2M equivalent approach to analyse both the effect of vehicle body roll and n-axle handling on vehicle dynamics. The 1M equivalent vehicle 2DOF equation including an equivalent roll effect was derived from the conventional two-axle 3DOF vehicle model. And the 1M equivalent dynamics concepts were calculated to evaluate the steady-state steering, frequency characteristics, and root locus of the two-axle vehicle with only the effect of body roll. This 1M equivalent approach is extended to a three-axle 3DOF model to derive similar 1M equivalent mathematical identities including an equivalent roll effect. The 1M equivalent wheelbases and stability factor with the effect of the third axle or body roll, and 2M equivalent wheelbase and stability factor including both the effect of body roll and the third-axle handling were derived to evaluate the steady-state steering, frequency characteristics, and root locus of the three-axle vehicle. By using the recursive method, the generalised 1M equivalent wheelbase and stability factor with the effect of n-axle handling and 2M equivalent generalised wheelbase and stability factor including both the effect of body roll and n-axle handling were derived to evaluate the steady-state steering, frequency characteristics, and root locus of the n-axle vehicle. The 2M equivalent approach and developed generalised mathematical handling concepts were validated to be useful and could serve as an important tool for estimating both the effect of vehicle body roll and n-axle handling on multi-axle vehicle dynamics.     

旅顺新港客货滚装码头后方陆域布置及规划

根据项目所在地的客滚运输特点,分析旅顺新港客货滚装作业区的周边环境、与相邻工程的关系、主要交通类型、交通组织形式以及停车场布置形式等总体布置时考虑的主要因素,介绍旅顺新港客货滚装作业区的总体布置思路,阐述客货滚装作业区的装卸工艺、停车场布置、交通组织等平面布置方面的要点。