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"All these frequencies, in my view, contribute to the sound radiation".
This can dramatically reduce the sound radiation from such structures.
Concerning the sound radiation, numerical results are compared with measurements.
Also the sound radiation from the duct wall is increased.
The results showed that SEA is applicable for calculation of sound radiation above 40 Hz and that sound radiation calculation results below 40 Hz can be inaccurate.
Accordingly, BEM in the frequency domain takes the velocity of the structural vibration as a sound radiation boundary condition; thus, sound radiation can be estimated using the BEM.
The harmonic vibration and sound radiation of such structures can be simplified by their axial symmetry.
In this paper, sound radiation of a rotating train wheel is studied only from the train.
Sound radiation occurs due to hull and propeller vibrations as well as dipole sound radiation caused by the operation of the propeller in a non-uniform wake.
In addition, vibratory velocity provides a useful description of the sound radiation from the vibrating structure.
The 2.5D BEM used to calculate wheel sound radiation characteristics is presented in Sect.
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