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NASA NTRS · Other
Helicopter engine core noise
Attribution
This is the abstract and citation. Full text lives at NASA NTRS — we link out rather than host. All credit to the authors and Legacy CDMS.
Abstract
Verbatim from NASA NTRS. Not paraphrased, not summarized.
Calculated engine core noise levels, based on NASA Lewis prediction procedures, for five representative helicopter engines are compared with measured total helicopter noise levels and ICAO helicopter noise certification requirements. Comparisons are made for level flyover and approach procedures. The measured noise levels are generally significantly greater than those predicted for the core noise levels, except for the Sikorsky S-61 and S-64 helicopters. However, the predicted engine core noise levels are generally at or within 3 dB of the ICAO noise rules. Consequently, helicopter engine core noise can be a significant contributor to the overall helicopter noise signature.
Author
- Vonglahn, U. H. NASA Lewis Research Center
Citation: Vonglahn, U. H. (2011). Helicopter engine core noise. Legacy CDMS. NASA NTRS ID 19840021607. https://ntrs.nasa.gov/citations/19840021607 ↗