Exact(5)
In the expression, the spherical harmonic functions are interpreted as the radiating modes and their superposition results in various radiation patterns.
The orthonormal property of the radiating modes also allows a general expression of the multipole radiated sound power.
In order to control the sound radiation by a structure, one aims to control vibration of radiating modes of vibration using "Energy Pumping" also named "Targeted Energy Transfer".
Nevertheless, due to the theoretical formulation, the method was not able to study radiating modes.
Thus, the present paper presents a modification of the previous method, with a view to finding either propagating modes or radiating modes.
Similar(55)
Relationships between these new concepts and the more classical one of radiating and non-radiating modes are presented.
In this work, the radiation modes for external radiating cylinders which account for both axial and circumferential dependence are presented.
The radiation modes determine the specific distribution of normal velocity of the shell that independently radiates sound to the surrounding space.
Because the concept of radiation modes can reveal the mechanics of radiation/vibration, it is appropriate to the problem of low-frequency noise radiated from highway bridges.
The static and dynamic properties of a smart trim panel are studied, verifying that when subjected to low-frequency (<500 Hz) excitation, it vibrates in the efficiently radiating piston mode.
Then a genetic algorithm is used to minimise the sound power radiated by different modes on the plate by finding the optimum design for the constraints.
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