Research Projects

Determining Feasibility of Applying Active Noise Reduction/Cancellation to Jet Aircraft Departures

Conduct research to update the state-of-the-science regarding the feasibility of reducing or eliminating noise in communities from aircraft departures, specifically behind the start of takeoff roll, with active noise reduction technology.

Background (Describe the current situation or problem in the industry, and how your idea would address it.)

Active noise reduction (ANR) is the production of sound at the same magnitude and opposite phase of the offending noise source so as to reduce or cancel the offending noise source, in real-time. The technology has been common in headphones for decades.

Jet aircraft departures produce a lot of low-frequency noise (rumble) at the start of their takeoff roll, in a swath to the side and to the rear of the aircraft. Low-frequency noise can propagate long distances and is a primary source of noise annoyance for adjacent communities.

ANR has had documented success with stationary jet engines but research into a moving source has been limited or non-existent. The bulk of ANR research is nearly 20 years old, not leveraging today's computer speeds and speaker technology. Current research is needed in this area

Objective (What is the desired product or result that will help the airport industry?)

Determine if active noise reduction of the start of takeoff roll of jet aircraft departures would be a viable and practical solution for commercial and general aviation airports, with existing computer and speaker technology. Feasibility would be judged in terms of cost and benefit. A demonstration would be performed.

Approach (Describe in general terms the steps you think are needed to achieve the objective.)

The steps, in general terms, to achieve the objective are:

  1. Identify required system components -- controllers, speakers, microphones, etc.
  2. Identify candidate airports based on proximity and orientation of residential areas to departure runways where active noise reduction could provide a noise benefit and candidate sites for testing
  3. Develop a test plan for conducting a test of a potential ANR system
  4. Acquire representative equipment
  5. Perform demonstration and quantify noise reduction
  6. Estimate final costs and a system specification
  7. Prepare report
Cost Estimate and Backup (Provide a cost estimate and support for how you arrived at the estimate.)

18 mos, $500k

Related Research - List related ACRP and other industry research; describe gaps (see link to Research Roadmaps above), and describe how your idea would address these gaps. This is a critical element of a synthesis topic submission.

Eisses, A. 2015. Ridges Against Ground Noise. Ground Noise Mitigation at Amsterdam Airport Schiphol. TNO, The Netherlands. Presentation at UC Davis Aviation Noise and Air Quality Symposium, April 2015.

Gibson, Robert G., Stusnick, Eric, Smith, Jerome P., Burdisso, Ricardo A. and Fuller, Christopher R. 1994. "An Investigation of Active Noise Reduction of Jet Engine Runup Noise." Wyle Research Report WR 94-26, Wyle Laboratories, Inc. and Virginia Polytechnic Institute and State University, October.

Gibson, Robert G. and Stusnick, Eric 1995a. "Experimental Investigation of Low-Frequency Noise from USAF Hush Houses, Volume I: Noise Source Characterization." Wyle Research Report WR 95-28. Wyle Laboratories Inc., June.

Gibson, Robert G. and Stusnick, Eric 1995b. "Experimental Investigation of Low-Frequency Noise from USAF Hush Houses," Volume II: Active Noise Reduction. Wyle Research Report WR 95-29. Wyle Laboratories Inc., June.

Hobbs, C., Karantonis, K., and Sharp, B. 2000."Active Reduction of Airport Noise," The 29th International Congress and Exhibition on Noise Control Engineering. Nice, France. August.

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Idea No. 162