Читать книгу Vibroacoustic Simulation - Alexander Peiffer - Страница 80

The radiation efficiency is a quantity that relates the power of a plane wave to the radiated power of a vibrating surface with same surface averaged velocity. The definition of the radiation efficiency was motivated by experimental procedures because it allows the estimation of the radiated power from the measurements of the vibration velocity. The squared average velocity of a vibrating surface is

(2.162)

and the power radiated by a plane wave through the same area S is given by (2.47)

(2.163)

The radiation efficiency is defined as the ratio between the radiated power of a velocity profile vz(r) of a surface S and the standardized power of the plane wave:

(2.164)

The radiation efficiency is used to determine the radiated power of vibrating structures from calculated, estimated, or measured radiation efficiency of specific surfaces

(2.165)