Aircraft noise

About: Aircraft noise is a research topic. Over the lifetime, 3051 publications have been published within this topic receiving 32039 citations.

Department of Navy Jet Noise Reduction Project Overview

Abstract: : High performance military aircraft represent the single largest noise source for Sailors on board aircraft carriers resulting in health issues, compromised operations and costly litigation. Unfortunately, tactical aircraft have not been able to leverage much of the available significant noise reduction technologies from commercial aircraft due to their low bypass ratio jet engines and resulting high temperature, high velocity exhaust streams. Tactical aircraft noise remains a problem from both community noise and personnel exposure perspectives. In response to the problem and recent Senior Leadership direction, the Office of Naval Research initiated the Jet Noise Reduction (JNR) Project as part of the Noise-Induced Hearing Loss (NIHL) Program. The JNR Project's over-arching objective is to realize and transition significant jet noise reduction technologies through coordinated S&T efforts. This objective will be accomplished through establishing a sustained S&T effort in fundamental jet noise understanding, predictive capability and measurement/validation capability and through developing, demonstrating and transitioning jet noise reduction technologies in support of the Warfighter and the Community. In fiscal year 2010, initial funding was allocated to support the basic program structure and for the two main tasks given high priority- developing a physics-based understanding of jet noise and developing standards to facilitate high quality jet noise measurements. An overview of the JNR Project will be presented as well as some preliminary results and a strategic outlook.

The Effects of Surfaces on the Aerodynamics and Acoustics of Jet Flows

Abstract: Aircraft noise mitigation is an ongoing challenge for the aeronautics research community. In response to this challenge, low-noise aircraft concepts have been developed that exhibit situations where the jet exhaust interacts with an airframe surface. Jet flows interacting with nearby surfaces manifest a complex behavior in which acoustic and aerodynamic characteristics are altered. In this paper, the variation of the aerodynamics, acoustic source, and far-field acoustic intensity are examined as a large at plate is positioned relative to the nozzle exit. Steady Reynolds-Averaged Navier-Stokes solutions are examined to study the aerodynamic changes in the field-variables and turbulence statistics. The mixing noise model of Tam and Auriault is used to predict the noise produced by the jet. To validate both the aerodynamic and the noise prediction models, results are compared with Particle Image Velocimetry (PIV) and free-field acoustic data respectively. The variation of the aerodynamic quantities and noise source are examined by comparing predictions from various jet and at plate configurations with an isolated jet. To quantify the propulsion airframe aeroacoustic installation effects on the aerodynamic noise source, a non-dimensional number is formed that contains the flow-conditions and airframe installation parameters.

Advanced Study for Active Noise Control in Aircraft (ASANCA)

Abstract: Aircraft interior noise and vibration measurements are included in this paper from ground and flight tests. In addition, related initial noise calculations with and without active noise control are conducted. The results obtained to date indicate that active noise control may be an effective means for reducing the critical low frequency aircraft noise.

Airport Noise Pollution: Is There a Solution in Sight?

Abstract: Airport noise pollution is a widespread and growing problem in the United States. Traditionally the regulation of airport noise was left to state and local regulatory efforts as well as judicial actions brought under nuisance and inverse condemnation theories of liability. With the enactment of several pieces of federal legislation beginning in the 1970s, however, Congress has clarified its intent to preempt local control of airport noise. Local governments and airport proprietors have to comply with a complicated scheme of federal regulation and rely on insufficient funds to fully address the airport noise problem in their communities. This Comment suggests changes should be made to the regulatory framework governing the control of aircraft noise through reestablishment of the Office for Noise Abatement and Control within the Environmental Protection Agency, additional funds for noise mitigation projects, and research on the effects of aircraft noise, as well as a shift in the liability structure for noise violations.