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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Inertance ： ウィキペディア英語版 Inertance Inertance is a measure of the pressure difference in a fluid required to cause a change in flow-rate with time. The base SI units of inertance are kg m−4 or Pa m−3 s2 and the usual symbol is I. The inertance of a tube is given by: :$I\; =\; \backslash ,$ where :$\backslash rho$ is the density (with dimensionality of mass per volume) of the fluid :$\backslash ell$ is the length of the tube :$A$ is the cross-sectional area of the tube The pressure difference is related to the change in flow-rate by the equation: :$\backslash Delta\; p\; =\; I\; \backslash cdot\; =\; I\; \backslash cdot\; \{\backslash mathrm\; d\; Q\; \backslash over\; \{\backslash mathrm\; d\; t\}\}$ where :$p$ is the pressure of the fluid :$Q$ is the volumetric flow-rate (with dimensionality of volume per time) This equation assumes constant density, that the acceleration is uniform, and that the flow is fully developed "plug flow". This precludes sharp bends, water hammer, and so on. To some, it may appear counterintuitive that an increase in cross-sectional area of a tube reduces the inertance of the tube. However, for the same mass flow-rate, a lower cross-sectional area implies a higher fluid velocity and therefore a higher pressure difference to accelerate the fluid. In respiratory physiology, inertance (of air) is measured in cmH2O L−1 s2. 1 cmH2O L−1 s2 ≈ 98100 Pa m−3 s2. Using small-signal analysis, an inertance can be represented as a fluid reactance through the relation: :$X\; =\; j\; \backslash omega\; I$ where :$\backslash omega\; =\; 2\; \backslash pi\; f$ :$f$ is the frequency in Hz. ==References== * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Inertance」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.