Project 35 - Sound/Emission Propagation (GaTech)

Recent increases in fuel prices have driven the commercial aviation industry to focus on fuel efficiency. The efficiency of propellers and prop-fans has produced renewed interest in advanced "open rotor" engine designs. To contribute to the design process, noise predictions need to accurately identify the issues associated with these new designs and must forecast the annoyance of the population near airports due to the new noise sources. Spectra from propeller designs are typically dominated by tones at harmonics of the blade passage frequency, whereas turbofans generate much smoother spectra. Disagreement already exists regarding the need for tone corrections for turbofans, with certification noise levels including a tone correction and community noise contours not including one through the use of Day-Night Level (DNL). A tone-corrected DNL (DNLT) is presented and compared to alternative metrics, including those with and without tone and duration corrections, for turbofan, turbo-prop, and open rotor engines. The compatibility of DNLT with existing DNL contours will be demonstrated, as well as the predictive capability of the certification points with respect to various contour metrics. The results will show the variance between the contours from the different metrics as well as the need for regulatory bodies to consider the potential for increased annoyance above that predicted by DNL. In addition, the applicability of the identified metrics within the Federal Aviation Administration's (FAA's) Aviation Environmental Design Tool will be addressed.

• Record URL:
  http://partner.mit.edu/projects/open-rotor-noise-impact-%0Bairport-communities
• Supplemental Notes:
  • Program Information: Energy and Environment, Noise Impacts and Mitigation. Final report is available at: http://ntl.bts.gov/lib/54000/54400/54460/proj35-finalreport.pdf

Language

• English

Project

• Status: Active
• Funding: $174999.00
• Sponsor Organizations:

  Federal Aviation Administration

  800 Independence Avenue, SW
  Washington, DC  United States  20591
• Project Managers:

  Hileman, James

  Maurice, Lourdes

• Performing Organizations:

  Georgia Institute of Technology, Atlanta

  School of Building Construction
  280 Ferst Drive
  Atlanta, GA  United States  30332
• Principal Investigators:

  Waitz, Ian

• Start Date: 20120510
• Expected Completion Date: 0
• Actual Completion Date: 0
• Source Data: RiP Project 30585

Subject/Index Terms

• TRT Terms: Aircraft exhaust gases; Aircraft noise; Environmental impacts; Noise; Pollutants
• Subject Areas: Aviation; Environment; I15: Environment;

Filing Info

• Accession Number: 01572638
• Record Type: Research project
• Source Agency: Department of Transportation
• Files: RIP
• Created Date: Aug 11 2015 1:00AM