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Record Details

Record 10 of 7736
Analytical investigation of adaptive control of radiated inlet noise from turbofan engines
Author and Affiliation:
Risi, John D.(Virginia Polytechnic Inst. and State Univ., Blacksburg, VA, United States)
Burdisso, Ricardo A.(Virginia Polytechnic Inst. and State Univ., Blacksburg, VA, United States)
Abstract: An analytical model has been developed to predict the resulting far field radiation from a turbofan engine inlet. A feedforward control algorithm was simulated to predict the controlled far field radiation from the destructive combination of fan noise and secondary control sources. Numerical results were developed for two system configurations, with the resulting controlled far field radiation patterns showing varying degrees of attenuation and spillover. With one axial station of twelve control sources and error sensors with equal relative angular positions, nearly global attenuation is achieved. Shifting the angular position of one error sensor resulted in an increase of spillover to the extreme sidelines. The complex control inputs for each configuration was investigated to identify the structure of the wave pattern created by the control sources, giving an indication of performance of the system configuration. It is deduced that the locations of the error sensors and the control source configuration are equally critical to the operation of the active noise control system.
Publication Date: Jan 01, 1994
Document ID:
19950004864
(Acquired Dec 28, 1995)
Accession Number: 95N11277
Subject Category: ACOUSTICS
Document Type: Conference Paper
Publication Information: Inst. of Noise Control Engineering, Noise Con 1994: Proceedings of the 1994 National Conference on Noise Control Engineering. Progress in Noise Control for Industry; p 395-402
Publisher Information: United States
Contract/Grant/Task Num: NAG1-230
Financial Sponsor: NASA; United States
Organization Source: Virginia Polytechnic Inst. and State Univ.; Vibration and Acoustics Labs.; Blacksburg, VA, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ADAPTIVE CONTROL; AERODYNAMIC NOISE; AIRCRAFT NOISE; CONTROL SIMULATION; CONTROL SYSTEMS DESIGN; ENGINE INLETS; ENGINE NOISE; FAN BLADES; FAR FIELDS; FEEDFORWARD CONTROL; NOISE REDUCTION; TURBOFAN ENGINES; ALGORITHMS; ERRORS; MATHEMATICAL MODELS; SYSTEMS ENGINEERING
Imprint And Other Notes: In Inst. of Noise Control Engineering, Noise Con 1994: Proceedings of the 1994 National Conference on Noise Control Engineering. Progress in Noise Control for Industry p 395-402 (SEE N95-11259 01-71)
Availability Source: Other Sources
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