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Acoustic Injection Into a Pressurized Gas Through a Metallic Wall

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Injection of acoustic power from a piezoelectric transducer into a pressurized gas was studied in two cases.

1) Direct injection into the gas i.e. the acoustic system is placed in contact with the gas. 2) Injection through a metallic wall (the gas tank). We defined several indicators by which the acoustic injection could be quantified: the maximum injection efficiency (IEmax), the mean injection efficiency in a defined frequency range (MIE), the relative bandwidth of the injection (RBW), and a combined performance (CP) for the system, which combines MIE and RBW. The CP indicator efficiency was tested in case 1), of direct injection, where the optimal stack was found to be several λ/4 layers. In cases 2), the injection through a high impedance wall was more complex to investigate and less efficient in bandwidth. Several optimal designs were found with λ/4 or λ/2 matching layers, depending on whether the indicator was considered. High injection efficiency and wide bandwidth are difficult to obtain simultaneously. One of the best matching lines is a single λ/2 layer, with low impedance compared to the transducer or wall impedance.
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Document Type: Research Article

Publication date: September 1, 2007

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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