Radiation of higher order modes from circular ducts with flow
نویسندگان
چکیده
This work aims to predict the transfer function of a given modal content inside circular duct with bellmouth inlet in presence mean flow. The is relation amplitude and phase between mode an observer located far-field. numerical solution obtained by finite element simulation which flow input data. Verification provided comparison analytical unbaffled uniform Influence from various parameters such as geometry Mach number on radiated pressure field investigated. good approximation for finding principal lobe, found be more important than other when static configuration studied.
منابع مشابه
Higher order vortex gyrotropic modes in circular ferromagnetic nanodots
Magnetic vortex that consists of an in-plane curling magnetization configuration and a needle-like core region with out-of-plane magnetization is known to be the ground state of geometrically confined submicron soft magnetic elements. Here magnetodynamics of relatively thick (50-100 nm) circular Ni80Fe20 dots were probed by broadband ferromagnetic resonance in the absence of external magnetic f...
متن کاملTurbulent Pulsating Flow through Circular Ducts
In the present paper, a numerical method has been demonstrated which works on an overall NewtonRaphson type algorithm and is capable of solving the “inverse” problem for turbulent, fullydeveloped, pulsating pipe flows, where the mass flow rate, rather than the pressure gradient is prescribed as a periodic function of time. The momentum equation, governing the transient, fullydeveloped pulsating...
متن کاملHigher Order Sliding Modes
One of the most important control problems is control under heavy uncertainty conditions. While there are a number of sophisticated methods like adaptation based on identi cation and observation, or absolute stability methods, the most obvious way to withstand the uncertainty is to keep some constraints by "brutal force". Indeed any strictly kept equality removes one "uncertainty dimension". Th...
متن کاملDetermination of Resonance Frequency of Dominant and Higher Order Modes in Thin and Thick Circular Microstrip Patch Antennas with Superstrate by MWM (RESEARCH NOTE)
An accurate model named as the Modified Wolff Model (MWM) is presented as an efficient CAD tool for determination of resonant frequency of the dominant and higher order modes under the multi-layer condition in thin and thick circular microstrip patch antennas. The effects of dielectric cover on the resonant frequency obtained from MWM have been compared against the result of theoretical method ...
متن کاملEffects of Higher Order Modes
The surface currents on a two-wire transmission line induced by incident field excitations are investigated using the spectral concept. A simple solution is obtained for plane wave excitation. A solution for voltage source excitation, in which the induced current may be given, at least approximately, by means of the so-called leaky-wave concept, is considered. The influence of the electrical di...
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: Acta acustica
سال: 2023
ISSN: ['2681-4617']
DOI: https://doi.org/10.1051/aacus/2023011