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Variable Sound Insulation Structure with MFC Elements

Górski P., Kozupa M.

Archives of Acoustics

2012

Vol. 37, No. 1

115-120

Additional sound sources are used as actuators in the vast majority of active noise reduction systems. One of the possible opportunities to extend the field of applications of active noise reduction systems is using active structures of variable sound insulation. The paper presents an analysis of ways of reducing noise with a structure of variable sound insulation consisting of a metal plate, active elements (Macro Fiber Composite), and a control system. The paper presents results of acoustic radiation simulations and measurements of sound intensity generated by the structure under the influence of stimulation by an acoustic wave. Simulations of mechanical vibrations and acoustic radiation for the plate were performed with the finite element method and ANSYS software. Simulation results made it possible to select locations for gluing the active elements and sensors. Analyses of the sound pressure level in the space to which the plate is radiating made it possible to determine dominant frequencies in the characteristics and, as a result, indicate vibration modes that can be reduced. Sound intensity measurements were performed with a three-way probe of USP mini Microflown. Results of simulations and measurements show that it is possible to achieve an improvement of the insulating power of a metal plate by approx. 10 dB.

Active Vibration Suppression by Application of Macro Fiber Composite

Mitura A., Warmiński J., Bocheński M.

Machine Dynamics Research

2011

Vol. 35, No. 2

55-61

Application of the macro fiber composite (MFC) as an active element to suppression of reduction by the nonlinear saturation control (NSC) method is solved analytically an numerically. Effectiveness of the proposed algorithm is optimised by minimising time transient dynamics and also amplitudre in the steady state.

Vibration Suppression of Composite Plate with MFC Active Elements

Mitura A., Kaźmir T., Warmiński J., Augustyniak M., Jarzyna W.

Machine Dynamics Research

2010

Vol. 34, No. 2

86-92

Application of the Macro Fiber Composite (MFC) as active elements for suppression of composite plate vibrations is presented in this paper. Vibrations are reduced by the Nonlinear Saturation Control (NSC) method. Effectiveness of the algorithm is tested in Matlab package using a reduced model of a plate. The numerical results are verified experimentally.