Structural Vibration Control for Broadband Noise Attenuation in Enclosures

• Published in: Journal of mechanical science and technology Vol. 19; no. 7; pp. 1414 - 1423
• Main Authors: KRISHNASWAMY, Kailash, RAJAMANI, Rajesh, JONG JIN WOO, YOUNG MAN CHO
• Format: Journal Article
• Language: English
• Published: Seoul 대한기계학회 01-07-2005; Korean Society of Mechanical Engineers; Springer Nature B.V
• Subjects: Accelerometers; Acoustics; Actuators; Attenuation; Broadband; Control systems; Dynamic models; Enclosures; Exact sciences and technology; Feedback control; Fundamental areas of phenomenology (including applications); Mathematical models; Noise; Noise control; Physics; Robustness; Solid mechanics; Strategy; Structural acoustics and vibration; Structural and continuum mechanics; Structural vibration; Studies; Vibration control; Vibration mode; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); Vibration; Feedback regulation; Enclosure; Noise control; Modeling; Acoustic Enclosure; Structural Control; Wide band; Vibration control; Robustness; Vibrational mode; Dynamic model; Monitoring control system; Noise Attenuation; Structural acoustics; Actuator; Modal control
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/BF03023900

This paper develops and evaluates several strategies for structural vibration control with the objective of attenuating broadband noise inside a rectangular enclosure. The strategies evaluated include model-independent collocated control, model-based feedback control and a new “modal-estimate” feedback strategy. Collocated control requires no knowledge of model parameters and enjoys the advantage of robustness. However, effective broadband noise attenuation with colocated control requires a large number of sensor-actuator pairs. Model-based controllers, on the other hand, can be theoretically effective even with the use of a single actuator. However, they suffer from a lack of robustness and are unsuitable from a practical point of view for broadband structural vibration applications where the dynamic models are of large order and poorly known. A new control strategy is developed based on attenuating a few structural vibration modes that have the best coupling with the enclosure acoustics. Broadband attenuation of these important modes can be achieved using a single actuator, a limited number of accelerometers and limited knowledge of a few modal functions. Simulation results are presented to demonstrate the effectiveness of the developed strategy.