Equivalent acoustic impedance model. Part 2: analytical approximation
نویسندگان
چکیده
منابع مشابه
Impedance-Acoustic Tomography
In this work we present a new hybrid imaging technique that combines electrical impedance tomography (EIT) with acoustic tomography. The novel technique makes use of the fact that the absorbed electrical energy inside the body raises its temperature, thus leading to expansion effects. The expansion then induces an acoustic wave which can be recorded outside the body and consequently be used to ...
متن کاملInterplay of Electron Cloud and Impedance in an Analytical Model
In the SPS the electron cloud is mainly produced in the dipoles. This leads to specific beam instabilities which are * [email protected] quite different in horizontal and vertical plane. The influence geometry of, both the wake field and the electron cloud, are discussed.
متن کاملMeasurement of Eardrum Acoustic Impedance
In this paper we describe a system which we have developed to measure cat ear canal specific acoustic impedance Zsp, magnitude and phase, as a function of frequency, for frequencies between 200 Hz and 33 kHz, and impedance magnitude between 4.0 to 4.0×105 [Rayles] (MKS). The object to be measured is placed at the end of a 3.5 mm diameter sound delivery tube. After a simple calibration procedure...
متن کاملApproximation by Generalized Impedance Boundary Conditions of a Transmission Problem in Acoustic Scattering
This paper addresses some results on the development of an approximate method for computing the acoustic field scattered by a three-dimensional penetrable object immersed into an incompressible fluid. The basic idea of the method consists in using on-surface differential operators that locally reproduce the interior propagation phenomenon. This approach leads to integral equation formulations w...
متن کاملApproximation formulae for the acoustic radiation impedance of a cylindrical pipe
Useful approximation formulae for radiation impedance are given for the reflection coefficients of both infinitely flanged and unflanged rigid-walled cylindrical ducts. The expressions guarantee that simple but necessary physical and mathematical principles are met, like hermitian symmetry for the reflection coefficient (identical behaviour of positive and negative frequencies) and causality fo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Sound and Vibration
سال: 2004
ISSN: 0022-460X
DOI: 10.1016/j.jsv.2003.08.054