Development of nonlinear acoustic propagation analysis tool toward realization of loud noise environment prediction in aeronautics

2015 ◽  
Author(s):  
Masashi Kanamori ◽  
Takashi Takahashi ◽  
Takashi Aoyama
Keyword(s):  
Acoustic Propagation ◽  
Analysis Tool ◽  
Loud Noise ◽  
Noise Environment ◽  
Propagation Analysis ◽  
Nonlinear Acoustic

Wave Propagation Analysis of Piping Structures

2009 ◽  
Author(s):  
Akemi Nishida
Keyword(s):  
Wave Propagation ◽  
Dynamic Behavior ◽  
Nuclear Power ◽  
Power Plants ◽  
Three Dimensional ◽  
Beam Theory ◽  
Spectral Element ◽  
Analysis Tool ◽  
Propagation Analysis ◽  
Piping Systems

It is becoming important to carry out detailed modeling procedures and analyses to better understand the actual phenomena. Because some accidents caused by high-frequency vibrations of piping have been recently reported, the clarification of the dynamic behavior of the piping structure during operation is imperative in order to avoid such accidents. The aim of our research is to develop detailed analysis tools and to determine the dynamic behavior of piping systems in nuclear power plants, which are complicated assemblages of different parts. In this study, a three-dimensional dynamic frame analysis tool for wave propagation analysis is developed by using the spectral element method (SEM) based on the Timoshenko beam theory. Further, a multi-connected structure is analyzed and compared with the experimental results. Consequently, the applicability of the SEM is shown.

scholarly journals Nonlinear acoustic propagation in bubbly liquids: Multiple scattering, softening and hardening phenomena

2016 ◽  
Vol 139 (4) ◽  
pp. 1703-1712 ◽  
Author(s):  
Jean-Baptiste Doc ◽  
Jean-Marc Conoir ◽  
Régis Marchiano ◽  
Daniel Fuster
Keyword(s):  
Multiple Scattering ◽  
Acoustic Propagation ◽  
Bubbly Liquids ◽  
Nonlinear Acoustic
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