Atmospheric winds and their implications for microair vehicles
Atmospheric winds and their implications for microair vehicles
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DOI：
10.2514/1.22670
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发表时间：
2006-11-01
期刊：
影响因子：
2.5
通讯作者：
Melbourne, William H.
中科院分区：
文献类型：
--
作者：
Watkins, Simon;Milbank, Juliette;Melbourne, William H.
低速微光的主要挑战是由大气边界层引起的瞬时和时间平均速度，特别是地面以上几米处的湍流。在本文中，以前的工作的时间和空间特性的大气边界层，接近地面，和相对湍流的移动的工艺，被认为是。新的测量文件的时间，平均和瞬态速度在4在地面以上的高度。这些是使用一组四个多孔压力探针，横向间隔150和50毫米的桅杆上的测试车。研究了俯仰角的瞬态变化，发现随着横向间距的减小，俯仰角随横向间距的总体变化相对缓慢地减小，但这种变化和俯仰角的相干性都可以无量纲地描述。由于俯仰变化随横向间距的缓慢减小意味着由垂直波动引起的横摇输入将随跨度的减小而增加，因此推测需要越来越主动和权威的控制系统。
Major challenges to low speed microllight are the transient and time-averaged velocities arising from the atmospheric boundary layer, particularly turbulence a few meters above the ground. In this paper, prior work on the temporal and spatial characteristics of the atmospheric boundary layer, close to the ground, and the relative turbulence as perceived by a moving craft, are considered. New measurements are described that document the time-, averaged and transient velocities at a height of 4 in above the ground. These were made using a bank of four multihole pressure probes laterally separated by 150 and 50 mm on a mast above a test car. Transient How pitch angles were investigated and it was found that the overall variation with lateral separation decreased relatively slowly with reducing separation, but that both this and the pitch angle coherence may be described nondimensionally. As the slow decrease in pitch variation with lateral spacing implies that the roll inputs arising from vertical fluctuations would increase with reducing span, it is speculated that increasingly active and authoritative control systems are required.