@article{140727c12b1e4f07b34445a6042108fa,
title = "A maneuvering flight noise model for helicopter mission planning",
abstract = "A new model for estimating the noise radiation during maneuvering flight is developed in this paper. The model applies the quasi-static acoustic mapping (Q-SAM) method to a database of acoustic spheres generated using the fundamental rotorcraft acoustics modeling from experiments (FRAME) technique. A method is developed to generate a realistic flight trajectory from a limited set of waypoints and is used to calculate the quasi-static operating condition and corresponding acoustic sphere for the vehicle throughout the maneuver. By using a previously computed database of acoustic spheres, the acoustic impact of proposed helicopter operations can be rapidly predicted for use in mission planning. The resulting FRAME-QS model is applied to near-horizon noise measurements collected for the Bell 430 helicopter undergoing transient pitch-up and roll maneuvers, with good agreement between the measured data and the FRAME-QS model. ",
author = "Eric Greenwood and Robert Rau",
note = "Funding Information: Much of the research described in this article was conducted by the authors while employed at the NASA Langley Research Center and was supported by the Revolutionary Vertical Lift Technology (RVLT) project. The authors would like to acknowledge the entire Bell 430 Maneuver Acoustics Flight Test team for providing the extensive data and analysis on which this paper is based, in particular Test Director Michael E. Watts, NASA Langley Research Center (ret.), and Bell Project Lead Royce Snider, Bell Helicopter Textron. Thanks to David A. Conner, U.S. Army (ret.), Charles D. Smith, Analytical Mechanics Associates, Christopher Hobbs, KBRwyle, and Ben May, formerly KBRwyle, for helpful discussions in the preparation of this paper. In addition, a special thanks to Dr. Richard D. Sickenberger, whose research at the University of Maryland forms much of the basis for the model developed in this paper. Funding Information: Much of the research described in this article was conducted by the authors while employed at the NASA Langley Research Center and was supported by the RevolutionaryVertical Lift Technology (RVLT) project. The authors would like to acknowledge the entire Bell 430 Maneuver Acoustics Flight Test team for providing the extensive data and analysis on which this paper is based, in particular Test Director Michael E. Watts, NASA Langley Research Center (ret.), and Bell Project Lead Royce Snider, Bell Helicopter Textron. Thanks to David A. Conner, U.S. Army (ret.), Charles D. Smith, Analytical Mechanics Associates, Christopher Hobbs, KBRwyle, and Ben May, formerly KBRwyle, for helpful discussions in the preparation of this paper. In addition, a special thanks to Dr. Richard D. Sickenberger, whose research at the University of Maryland forms much of the basis for the model developed in this paper. Publisher Copyright: {\textcopyright} 2020 AHS International.",
year = "2020",
month = apr,
doi = "10.4050/JAHS.65.022007",
language = "English (US)",
volume = "65",
journal = "Journal of the American Helicopter Society",
issn = "0002-8711",
publisher = "American Helicopter Society",
number = "2",
}