Makarenko V. Methods of vibration and sound radiation reduction control of elastic structures

The active, passive and combined methods of vibration and noise attenuation of flexible mechanical structures are offered on low frequencies. These methods include elaboration of mathematical model of flexible structure, optimization of the concentrated masses parameters, parameters of compensative forces and moments and development of control system by compensative excitations. The mathematical modeling is executed on the row of examples of flexible structures, which include beams, plates and curved panels with different boundary conditions and excitation types. Optimization, depending on the set task, is executed for integrated along frequency objective functions, which take into account: structure vibration in a separate point, vibration on all surface, acoustic power, sound transmission loss. For the synthesis of automatic control system the optimization of the above mentioned criteria was performed by changing the parameters of the concentrated masses, forces, moments. Optimization carried out both individually for each parameter, and by means of all parameters simultaneously, allowing to demonstrate the synergy of active and passive methods for noise and vibration reduction.