Tunable compression of wind tunnel data
Tunable compression of wind tunnel data
复制标题
风洞数据的可调压缩
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
E. Simiu
中科院分区：
文献类型：
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作者：
A. Possolo;M. Kasperski;E. Simiu
同步风致压力，在风洞测试中测量的模型建筑仪表与数百个测压口，是一个宝贵的资源，有效地设计安全的建筑物。与传统的表格和图表相比，它们能够更详细、更准确地表示驱动工程设计的力和力矩。然而，这种测试通常产生的大量数据对其在实践中的广泛使用构成了挑战。本文解释了如何小波表示的时间序列的压力测量在每个抽头可以用来压缩数据大幅同时保留这些功能是最有影响力的设计，以及它如何使增量数据传输，适应每个特定的应用程序的精度需求。在这种压缩中产生的损耗是可调的并且是已知的。高达90%的压缩率引起的畸变在统计上与风洞试验的固有变异性无法区分，我们根据在相同风洞条件下进行的大量重复试验进行测量。
Synchronous wind-induced pressures, measured in wind-tunnel tests on model buildings instrumented with hundreds of pressure taps, are an invaluable resource for designing safe buildings efficiently. They enable a much more detailed, accurate representation of the forces and moments that drive engineering design than conventional tables and graphs do. However, the very large volumes of data that such tests typically generate pose a challenge to their widespread use in practice. This paper explains how a wavelet representation for the time series of pressure measurements acquired at each tap can be used to compress the data drastically while preserving those features that are most influential for design, and also how it enables incremental data transmission, adaptable to the accuracy needs of each particular application. The loss incurred in such compression is tunable and known. Compression rates as high as 90% induce distortions that are statistically indistinguishable from the intrinsic variability of wind-tunnel testing, which we gauge based on an unusually large collection of replicated tests done under the same wind-tunnel conditions.