Results 1 to 10 of about 21,419 (265)
A Review of Acoustic Impedance Matching Techniques for Piezoelectric Sensors and Transducers [PDF]
Sensors, 2020 The coupling of waves between the piezoelectric generators, detectors, and propagating media is challenging due to mismatch in the acoustic properties. The mismatch leads to the reverberation of waves within the transducer, heating, low signal-to-noise ...
Vivek T. Rathod
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Modelling Turbine Acoustic Impedance [PDF]
International Journal of Turbomachinery, Propulsion and Power, 2021 We quantify the sensitivity of turbine acoustic impedance to aerodynamic design parameters. Impedance boundary conditions are an influential yet uncertain parameter in predicting the thermoacoustic stability of gas turbine combustors.
James Brind, Graham Pullan
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Acoustic impedance-based surface acoustic wave chip for gas leak detection and respiratory monitoring [PDF]
Communications EngineeringAcoustic impedance enables many interesting acoustic applications. However, acoustic impedance for gas sensing is rare and difficult. Here we introduce a micro-nano surface acoustic wave (SAW) chip based on the acoustic impedance effect to achieve ultra ...
Baile Cui +7 more
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The influence of impedance mismatch of the medium with gradient change of impedance on acoustic characteristics [PDF]
MATEC Web of Conferences, 2019 Medium with gradient change of acoustic impedance is a new type acoustic structure. It is composed of several materials and has a continuous gradient composition and structure whose specific acoustic impedance varies smoothly across the layer.
Hu Bo, Wang Moran, Du Yimei
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Acoustic impedance of orifices with grazing flow [PDF]
MATEC Web of Conferences, 2020 The paper presents an overview of the results of studies of acoustic impedance of orifices with grazing airflow. Empirical models of orifice impedance, which take into account the grazing flow, and the existing methods of measuring the acoustic impedance
Bejsenbaeva Diana +3 more
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JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2020 This research ilustrate the generation of acoustic impedance inversion in the absence of well log using stacking velocity input in Salawati Basin, Papua, Indonesia using data obtained from seismic lines and stacking velocity section.
Handoyo +2 more
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Acoustics, 2020 Scanning acoustic microscopy reveals information on histology and acoustic impedance through tissues. The objective of the present study was to investigate whether acoustic impedance values in the liver over time reflect the progression of ...
Hideki Kumagai +5 more
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Evaluation of the acoustic impedance of a screen [PDF]
The Journal of the Australian Mathematical Society. Series B. Applied Mathematics, 1977 AbstractA direct numerical computation is provided for the impedance of a screen consisting of a regular array of slits in a plane wall. The problem is solved within the framework of oscillatory Stokes flow, and results presented as a function of porosity, frequency and viscosity.
Macaskill, C., Tuck, E. O.
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Acoustic behavior of composites with gradient impedance
Materials & Design, 2020 Conventional acoustic materials with uniform media which are of fixed impedance and density are unable to satisfy the requirements of the development of modern acoustic technology in volume, weight, pressure resistance and stealth performance.
Yiwen Feng, Jing Qiao, Longqiu Li
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Acoustics, 2023 A comparison is considered of the experimentally obtained impedance of locally reacting acoustic liner samples with the impedance calculated using semi-empirical Goodrich, Sobolev and Eversman models. The semi-empirical impedance models are outlined.
Vadim Palchikovskiy +3 more
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