StartFraction upper A Subscript ref Baseline Over 4 pi r squared EndFraction right-brace EndLayout"/>yields
Entering typical values for air with ρ0=1.23 kg/m 3 and c0=343 m/s using Aref=1 m 2 we get
matching well to the reference value of acoustic power.
Bibliography
1 W.R. Graham. BOUNDARY LAYER INDUCED NOISE IN AIRCRAFT, PART I: THE FLAT PLATE MODEL. Journal of Sound and Vibration, 192(1): 101–120, April 1996. ISSN 0022-460X.
2 Finn Jacobsen. PROPAGATION OF SOUND WAVES IN DUCTS. Technical Note 31260, Technical University of Denmark, Lynby, Denmark, September 2011.
3 Reinhard Lerch and H. Landes. Grundlagen der Technischen Akustik, September 2012.
4 P.M.C. Morse and K.U. Ingard Theoretical Acoustics. International Series in Pure and Applied Physics. Princeton University Press, 1968. ISBN 978-0-691-02401-1.
Notes
1 1 Keeping v0≠0 would lead to the convective wave equation that is used in the context of flow related acoustic problems, which is more a topic of aero acoustics
2 2 Negative k means propagation in positive x-direction, because of the jωt convention. This is the reason why pure acoustic textbooks usually take the −jωt convention in order to get positive wavenumber for positive propagation.
3 3 This can be proven using the relationship between the δ and exponential functions
Конец ознакомительного фрагмента.
Текст предоставлен ООО «ЛитРес».
Прочитайте эту книгу целиком, купив полную легальную версию на ЛитРес.
Безопасно оплатить книгу можно банковской картой Visa, MasterCard, Maestro, со счета мобильного телефона, с платежного терминала, в салоне МТС или Связной, через PayPal, WebMoney, Яндекс.Деньги, QIWI Кошелек, бонусными картами или другим удобным Вам способом.
