ACTIVE CONTROL OF SOUND RADIATION FROM A RECTANGULAR PLATE EXCITED BY A LINE MOMENT

✍ Scribed by J.-C. Lee; J.-C. Chen

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 159 KB
• Volume: 220
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1998.1934

✦ Synopsis

This paper analytically investigates the active control of sound radiation from a simply supported rectangular plate with line moment excitation. This model simulates ship hull vibration due to the flutter of the ship's deck or the vibration of a fuselage due to the flutter of an aircraft wing. Two control strategies, volume velocity cancellation and radiated sound power minimization, are applied to drive a long and narrow piezoelectric actuator to reduce the radiated power. The result shows that a reduction of radiated power by these two control strategies is made possible by the mechanisms of modal suppression and modal restructuring. A numerical analysis shows that the performance of the active control method is related to the location of the line moment and an actuator. For the case in which the line moment is excited at the midline of the plate, the strategy of volume velocity cancellation is unable to reduce the sound radiated power. However, in the case where the actuator is located at the midline of the plate, both control strategies lead to the same reduction in radiated power except the control of the radiation of modes (even, 1). On the other hand, there exists a large amount of sound power radiation near the low frequency resonant mode (even, 1) when the line moment and the actuator are located off the midline of a plate and volume velocity cancellation is applied to control the radiated power from the plate.