Flight investigation of cabin noise control treatments for a light turboprop aircraftThe in-flight evaluation of noise control treatments for a light, twin-engined turboprop aircraft presents several problems associated with data analysis and interpretation. These problems include data repeatability, propeller synchronization, spatial distributions of the exterior pressure field and acoustic treatment, and the presence of flanking paths. They are discussed here with regard to a specific aeroplane configuration. Measurements were made in an untreated cabin and in a cabin fitted with an experimental sidewall treatment. Results are presented in terms of the insertion loss provided by the treatment and comparison made with predictions based on laboratory measurements.
Document ID
19850067958
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wilby, J. F. (Bolt Beranek and Newman, Inc. Canoga Park, CA, United States)
Oneal, R. L. (Gulfstream Aerospace Corp. Bethany, OK, United States)
Mixson, J. S. (NASA Langley Research Center Hampton, VA, United States)