Cross-comparison of measurement techniques for the determination of train-induced aerodynmic loads on the trackbed
Cross-comparison of measurement techniques for the determination of train-induced aerodynmic loads on the trackbed
复制标题
确定道床上列车引起的空气动力载荷的测量技术的交叉比较
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
M. Weise
中科院分区：
文献类型：
--
作者：
P. Deeg;M. Jönsson;H. Kaltenbach;M. Schober;M. Weise
作为法德DEUFRAKO方案的一部分，在“露天空气动力学”(AOA)研究合作范围内，在意大利开展了一项轨道侧测量活动，重点是通过列车在轨道床上施加的载荷。罗马/费伦泽高铁的试验场包括有碴轨道和板式轨道两部分。从ETR 500系列每条轨道上通过约30列常规列车所记录的时间序列已根据一种通用方法进行了后处理，该方法被认为是未来战役的标准。计算和分析了几种类型的平均，包括集合平均、“序列”平均和相位平均。已证明，经典压力探头和高频超声波风速计是测量轨道床上方平均风速的合适装置。然而，如果主要车辆鼻部区域的细节进入发生局部流动反转的地方，则必须小心。压力探头信号会因油管中出现共振而受到破坏。低通滤波是获得有物理意义的信号的合适方法。可以分辨频率高达100赫兹的波动，从而能够区分相干贡献和随机贡献。对于平均轴向流速，不同类型的探头的偏差高达5%。
Within the research cooperation “Aerodynamics in Open Air” (AOA) as part of the French-German DEUFRAKO programme a track-side measurement campaign has been carried out in Italy focusing on the loads imposed by passing trains on the trackbed. The test site on the high-speed line Roma/Firenze included both segments of ballasted track and slab track. The time series recorded from the passage of about 30 regular trains per track of the ETR 500 family have been postprocessed according to a general approach which is proprosed as a standard for future campaigns. Several types of averages, including ensemble mean, “train” average, and phase averaging have been computed and analyzed. It has been demonstrated that classical pressure probes as well as high-frequency ultrasonic anemometers are suitable devices for the assessment of the average air speed above the trackbed. However, care has to be taken if details in the nose region of the leading vehicle come in to focus where local flow reversal occurs. Pressure probe signals are spoiled by the occurrence of resonances in the tubing. Low-pass filtering is a suitable way to arrive at physically meaningful signals. Fluctuations up to a frequency of 100Hz could be resolved, allowing to distinguish coherent and stochastic contributions. With respect to the mean axial flow speed different probe types deviate by up to 5%.