Oscillation of Flexible Tubes - High Speed Video of Onset

These experiments provide a detailed record of the oscillation of flexible rubber tubes as air flows through them. The tubes are mounted in an experimental rig illustrated in the text file "Oscillation of Flexible Tubes - High Speed Video of Onset.txt" The suction is gradually increased until the flexible tube just starts to oscillate, at which point high speed video is recorded of the tube from 2 cameras, and pressure recordings are made up and downstream of the tube. The pressure recordings and cameras are all triggered at the same time for simultaneous results. The average flow rate is also recorded from a rotameter at the inflow. Pressures are measured relative to the external atmospheric pressure. The flexible tubes are held in place under a prescribed axial strain. For each experimental run we have pressure traces and high speed video, the formats of which are given in "Oscillation of Flexible Tubes - High Speed Video of Onset.txt". Numerical data is stored in a csv file called "runX_numericdata.csv" containing 11 rows. The first column of the csv file contains the labels of the data, and the remaining columns contain the data itself. The order of the rows is as shown in the above table. The video and image files are named "runX_video1.avi", "runX_video2.avi", "runX_unstrainedtube_camera1.tiff", "runX_unstrainedtube_camera2.tiff", "runX_calimageY_camera1.tiff", and "runX_calimageY_camera2.tiff", where X is the run number, and Y is the calibration image number. These imaging files are compressed into a zip file called "runX_videodata.zip". Hence for each run there are 2 files: runX_numericdata.csv runX_videodata.zip which contain all of the experimental data. In addition there is a summary csv file called "run_summary.csv" which replicates some of the data already stored in the individual run files, but in a more accessible format. The data for these experiments was collected in April 2016 in the Acoustics Laboratory in Cambridge University Engineering Department (http://acoustics.eng.cam.ac.uk).本实验数据集详细记录了空气流经柔性橡胶管时的振荡行为。实验装置的安装方式详见文本文件"Oscillation of Flexible Tubes - High Speed Video of Onset.txt"。实验过程中，抽吸力逐渐增大，直至柔性橡胶管刚刚开始发生振荡，此时通过两台摄像机同步录制管体的高速视频，并采集管段上游与下游的压力数据。所有压力采集设备与摄像机均采用同步触发，以保证结果的时序一致性。入口处的转子流量计会记录平均流量。所有压力测量值均以外界大气压为基准。柔性橡胶管通过预设轴向应变固定就位。每次实验均可获得压力迹线与高速视频数据，其数据格式详见上述文本文件。数值数据存储于名为"runX_numericdata.csv"的逗号分隔值（Comma-Separated Values，CSV）文件中，该文件包含11行数据：第一列为数据标签，其余列存储具体数值，行顺序如前述表格所示。视频与图像文件的命名规则为：runX_video1.avi、runX_video2.avi、runX_unstrainedtube_camera1.tiff、runX_unstrainedtube_camera2.tiff、runX_calimageY_camera1.tiff以及runX_calimageY_camera2.tiff，其中X为实验编号，Y为校准图像编号。所有成像文件均压缩至名为"runX_videodata.zip"的压缩包中。因此，每个实验对应两个数据文件：runX_numericdata.csv与runX_videodata.zip，二者包含了该次实验的全部实验数据。此外，数据集还包含一个名为"run_summary.csv"的汇总CSV文件，该文件复刻了各单次实验文件中的部分数据，采用更便于读取的格式进行存储。本实验数据于2016年4月在剑桥大学工程系声学实验室（http://acoustics.eng.cam.ac.uk）采集完成。