The use of laminated composite materials in aircraft or automobile structures, though very common due to various advantages of these materials, often escalates the overall noise and vibration level. An active structural acoustic control (ASAC) strategy based on a frequency weighted optimal H2 controller is developed in the present work to attenuate the transmitted sound into an enclosure surrounded by laminated composite panels. A state-space model based on a two-way coupled fluid-structure interaction analysis using Green’s theorem is proposed to include the influence of the flexible panels on the enclosed fluid (air) and vice-versa. Few points within the cavity are identified as the observer locations based on the maximum sound pressure level (SPL) within the enclosure due to external mechanical excitation. The SPL averaged over these locations is used as the performance vector for the proposed H2 controller. A feedback control strategy is then developed using surface bonded collocated IDE-PFC actuators and PVDF sensors while optimizing the quadratic H2 norm between the external excitation and the performance vector with a limit on the actuation voltage. Numerical simulation shows a maximum of 11.4 dB of averaged SPL reduction achieved inside the enclosure for a particular configuration.
- Aerospace Division
Active Structural Acoustic Control of Sound Transmission Into a Laminated Composite Enclosure Using Piezoelectric Actuator-Sensor Pair With a Frequency Weighted Optimal H2 Controller
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Sahu, A, & Bhattacharya, P. "Active Structural Acoustic Control of Sound Transmission Into a Laminated Composite Enclosure Using Piezoelectric Actuator-Sensor Pair With a Frequency Weighted Optimal H2 Controller." Proceedings of the ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 1: Development and Characterization of Multifunctional Materials; Mechanics and Behavior of Active Materials; Modeling, Simulation and Control of Adaptive Systems. Colorado Springs, Colorado, USA. September 21–23, 2015. V001T03A028. ASME. https://doi.org/10.1115/SMASIS2015-9113
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