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首页> 外文会议>First Joint Conference IAHR-IWA on Pumps, Electromechanical Devices and Systems Applied to Urban Water Management Vol.2; 2003; Polytechnic University of Valencia Spain >Frequency-domain transient pipe flow solution including unsteady friction
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Frequency-domain transient pipe flow solution including unsteady friction

机译：包括非定常摩擦的频域瞬态管道流动解决方案

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摘要

Recently a number of papers have used the effect of leakage on certain frequency components of a transient signal for the detection of leaks in pipeline systems. These papers typically use a steady-state approximation of the unsteady frictional behaviour. The effect of steady-state friction is frequency-independent. However, it is widely known that the effects of unsteady friction are frequency-dependent and thus affect the leak detection methods. In this paper, the analysis of flow in the frequency domain provides an insight into the behaviour of unsteady friction for different frequency transients. An analytic solution for the inclusion of unsteady friction effects in the frequency-domain is presented herein. Two weighting function unsteady friction models are considered ― one for laminar flow and the other for smooth pipe turbulent flow.
机译：最近，许多论文已经使用泄漏对瞬态信号的某些频率分量的影响来检测管道系统中的泄漏。这些论文通常使用非稳态摩擦行为的稳态近似。稳态摩擦的影响与频率无关。但是，众所周知，不稳定摩擦的影响与频率有关，因此会影响泄漏检测方法。在本文中，通过对频域中的流动进行分析，可以洞悉不同频率瞬变下的非定常摩擦行为。本文提出了一种在频域中包含非定常摩擦效应的解析解决方案。考虑了两个加权函数非稳态摩擦模型-一个用于层流，另一个用于平滑的管道湍流。

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