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:: year 2, Issue 1 (Journal of Acoustical Engineering Society of Iran 2014) ::
مجله علمی پژوهشی انجمن مهندسی صوتیات ایران 2014, 2(1): 1-7 Back to browse issues page
Analytical model of sound transmission through infinitely long thin cylindrical shells made of functionally graded materials (FGMs)
Ali Nouri *, Mohammad Kazemi Nasrabadi, Sohrab Astarki
Abstract:   (6665 Views)

Functionally Graded Materials (FGMs) are a class of composites that have continuous variation of material properties from one surface to another. So, unlike composite laminates, there is no stress concentration. FGMs offer great promise in applications where the operating conditions are severe, including spacecraft heat shields, heat exchanger tubes, plasma facings for fusion reactors and engine components. In the present study, sound transmission through FGM cylindrical thin shell is investigated. The shell is assumed to be infinitely long and subjected to harmonic plane waves. The shell is immersed in a fluid medium and an external fluid (air) passes over it with a uniform speed. An exact solution is obtained by solving the shell equations in three directions and acoustic wave equations simultaneously. The transmission losses (TLs) obtained from the numerical solution are compared with those of other authors. Comparison shows a good agreement between the results. Because the pressure and displacement terms are expressed in infinite series form, the convergence checking is performed. Numerical results are used to show the effects of structural properties and flight conditions such as Mach number, flight level and volume fraction. The results shows as volume fraction exponent increases the TL decreasesin stiffness region, but the TL increases at in frequency higher than the ring frequency (mass-controlled region).

Keywords: Acoustic, Transmission loss, FGM cylindrical shell, Vibration
Full-Text [PDF 502 kb]   (566 Downloads)    
Type of Study: Research | Subject: Hydroacoustics
Received: 2014/04/10 | Accepted: 2014/09/12 | Published: 2014/09/22
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Nouri A, Kazemi Nasrabadi M, Astarki S. Analytical model of sound transmission through infinitely long thin cylindrical shells made of functionally graded materials (FGMs). مجله علمی پژوهشی انجمن مهندسی صوتیات ایران. 2014; 2 (1) :1-7
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year 2, Issue 1 (Journal of Acoustical Engineering Society of Iran 2014) Back to browse issues page
مجله علمی-پژوهشی انجمن مهندسی صوتیات ایران Journal of Acoustical Engineering Society of Iran
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