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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 Stokes' law of sound attenuation ： ウィキペディア英語版 Stokes' law of sound attenuation Stokes law of sound attenuation is a formula for the attenuation of sound in a Newtonian fluid, such as water or air, due to the fluid's viscosity. It states that the amplitude of a plane wave decreases exponentially with distance traveled, at a rate $\backslash alpha$ given by :$\backslash alpha\; =\; \backslash frac$ where $\backslash eta$ is the dynamic viscosity coefficient of the fluid, $\backslash omega$ is the sound's frequency, $\backslash rho$ is the fluid density, and $V$ is the speed of sound in the medium:〔Stokes, G.G. "On the theories of the internal friction in fluids in motion, and of the equilibrium and motion of elastic solids", ''Transaction of the Cambridge Philosophical Society'', vol.8, 22, pp. 287-342 (1845〕 The law and its derivation were published in 1845 by physicist G. G. Stokes, who also developed the well-known Stokes' law for the friction force in fluid motion. ==Interpretation== Stokes' law applies to sound propagation in an isotropic and homogeneous Newtonian medium. Consider a plane sinusoidal pressure wave that has amplitude $A\_0$ at some point. After traveling a distance $d$ from that point, its amplitude $A(d)$ will be :$A(d)\; =\; A\_0e^$ The parameter $\backslash alpha$ is dimensionally the reciprocal of length. In the International System of Units (SI), it is expressed in neper per meter or simply reciprocal of meter ($\backslash mathrm^$). That is, if $\backslash alpha\; =\; 1\; \backslash mathrm^$, the wave's amplitude decreases by a factor of $1/e$ for each meter traveled. 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「Stokes' law of sound attenuation」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.