Ashok Kumar
ABSTRACT
An important problem in systems such as automobile passenger compartments, aerospace interiors, helicopters, marine vehicles, launch vehicles and other enclosed spaces and cavities is the control of low frequency interior noise. In many of these systems the elastic structure surrounding the cavity vibrates under the action of mechanical and/or acoustic disturbances. These vibrations couple with the enclosed medium leading to generation of interior noise. Passive and active noise control methods can be used to reduce the interior noise. Active structural-acoustic control (ASAC) is a technique of active noise control (ANC) in which secondary sources of excitation are used on the structure itself with the objective of reducing the sound. In this paper, direct output feedback control strategy is experimentally evaluated on a 3-D rectangular box cavity. The modal analysis of the rectangular plate is carried out. The direct output feedback controller gain is calculated based on the pole-zero map. It is found that the actuation voltage adds damping at the resonance; also add stiffness, due to that the peaks are shifting towards right direction. It is observed that the noise inside the cavity has been reduced when direct output feedback control strategy is used.
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