Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 2

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
EN
The main aim of this study is to calculate magnitudes describing the sound radiation by a system containing two vibrating circular pistons located in tree-wall corner. It is assumed that there is no influence of the surrounding medium on the sources vibrations and the vibration velocities of the pistons are time-harmonic. Making use of the known form of the Green function valid for tree-wall corner area the formulae presenting the acoustic pressure radiated by considered sources has been obtained. In order to characterize the sound radiation of the examined system of sources the self and the mutual powers in the integral form have been also expressed. Employing the well known integral expressions the obtained formula for the self power can be presented in the form of the fast convergent sum. The investigations presented herein can be very useful for a projection systems containing some vibrating pistons. On the basis of the presented in this paper formulae the acoustic properties of the vibrating pistons embedded in tree-wall corner can be predicted. It can be very advantageous to design vibrating systems and helpful to reduce harmful noise.
2
Content available remote The acoustic power of a circular plate excited by non-uniform surface pressure
EN
This work is focused on the analysis of the influence of a non-uniformly distributed surface excitation on sound radiation by a clamped circular plate embedded in a flat rigid baffle. It is assumed that the vibrations and radiations are axisymmetric and time-harmonic, moreover, the losses of energy into the plate's material are neglected. The influence of the surrounding medium on the vibration of the plate is not taken into account. The distribution of the exciting pressure is assumed in the form of a function whose shape can be modeled by fitting suitable values of parameters. The approximation of the distribution of the forcing pressure by the use of an analytical function makes it possible to consider practical cases. Integral formulae for describimg the active power have been obtained. The solution of the equation of motion is achieved by employing an expansion into series of eigenfunctions. An analysis of the influence of the parameters characterizing the surface excitation on the radiation power has also been presented. The low and high frequency elementary form asymptotics can be obtained by using the reached herein formulae and the known approximated expressions.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.