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  • Aircraft Design, Testing and Performance  (2)
  • 2020-2023
  • 2020-2022
  • 2005-2009  (2)
  • 1985-1989
  • 1940-1944
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  • 1
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    Decentralized Control of Sound Radiation from an Aircraft-Style Panel Using Iterative Loop Recovery (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A decentralized LQG-based control strategy is designed to reduce low-frequency sound transmission through periodically stiffened panels. While modern control strategies have been used to reduce sound radiation from relatively simple structural acoustic systems, significant implementation issues have to be addressed before these control strategies can be extended to large systems such as the fuselage of an aircraft. For instance, centralized approaches typically require a high level of connectivity and are computationally intensive, while decentralized strategies face stability problems caused by the unmodeled interaction between neighboring control units. Since accurate uncertainty bounds are not known a priori, it is difficult to ensure the decentralized control system will be robust without making the controller overly conservative. Therefore an iterative approach is suggested, which utilizes frequency-shaped loop recovery. The approach accounts for modeling error introduced by neighboring control loops, requires no communication between subsystems, and is relatively simple. The control strategy is validated using real-time control experiments performed on a built-up aluminum test structure representative of the fuselage of an aircraft. Experiments demonstrate that the iterative approach is capable of achieving 12 dB peak reductions and a 3.6 dB integrated reduction in radiated sound power from the stiffened panel.
    Keywords: Aircraft Design, Testing and Performance
    Type: Acoustics ''08 Paris Conference and Exhibition - 155th Acoustical Society of America; Jun 29, 2008 - Jul 04, 2008; Paris; France
    Format: application/pdf
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  • 2
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    A High-Authority/Low-Authority Control Strategy for Coupled Aircraft-Style Bays (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents a numerical investigation of an active structural acoustic control strategy for coupled aircraft-style bays. While structural coupling can destabilize or limit the performance of some model-based decentralized control systems, fullycoupled centralized control strategies are impractical for typical aircraft containing several hundred bays. An alternative is to use classical rate feedback with matched, collocated transducer pairs to achieve active damping. Unfortunately, due to the conservative nature of this strategy, stability is guaranteed at the expense of achievable noise reduction. Therefore, this paper describes the development of a combined control strategy using robust active damping in addition to a high-authority controller based on linear quadratic Gaussian (LQG) theory. The combined control system is evaluated on a tensioned, two-bay model using piezoceramic actuators and ideal point velocity sensors. Transducer placement on the two-bay structure is discussed, and the advantages of a combined control strategy are presented.
    Keywords: Aircraft Design, Testing and Performance
    Type: AIAA Paper a06_032 , ACTIVE 2006: 6th International Symposium on Active Noise and Vibration Control; Sep 18, 2006 - Sep 20, 2006; Adelaide; Australia
    Format: application/pdf
    Location Call Number Expected Availability
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