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Optimization of actuator arrays for aircraft interior noise controlA numerical procedure for grouping actuators in order to reduce the number of degrees of freedom in an active noise control system is evaluated using experimental data. Piezoceramic actuators for reducing aircraft interior noise are arranged into groups using a nonlinear optimization routine and clustering algorithm. An actuator group is created when two or more actuators are driven with the same control input. This procedure is suitable for active control applications where actuators are already mounted on a structure. The feasibility of this technique is demonstrated using measured data from the aft cabin of a Douglas DC-9 fuselage. The measured data include transfer functions between 34 piezoceramic actuators and 29 interior microphones and microphone responses due to the primary noise produced by external speakers. Control inputs for the grouped actuators were calculated so that a cost function, defined as a quadratic pressure term and a penalty term, was a minimum. The measured transfer functions and microphone responses are checked by comparing calculated noise reductions with measured noise reductions for four frequencies. The grouping procedure is then used to determine actuator groups that improve overall interior noise reductions by 5.3 to 15 dB, compared to the baseline experimental configuration.
Document ID
19940034697
Document Type
Conference Paper
Authors
Cabell, R. H. (Virginia Polytechnic Inst. and State Univ. Blacksburg, United States)
Lester, H. C. (NASA Langley Research Center Hampton, VA, United States)
Mathur, G. P. (NASA Langley Research Center Hampton, VA, United States)
Tran, B. N. (McDonnell Douglas Aerospace Long Beach, CA, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1993
Subject Category
AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Report/Patent Number
AIAA PAPER 93-4447
Meeting Information
AIAA, Aeroacoustics Conference(Long Beach, CA)
Distribution Limits
Public
Copyright
Other