Open Access
Maneuver Acoustic Flight Test of the Bell 430 Helicopter
Michael E. Watts,Royce Snider,Eric Greenwood,Joel Baden +3 more
- pp 24-40
Reads0
Chats0
TLDR
A cooperative flight test by NASA, Bell Helicopter and the U.S. Army to characterize the steady state acoustics and measure the maneuver noise of a Bell helicopter 430 aircraft was accomplished.Abstract:
A cooperative flight test by NASA, Bell Helicopter and the U.S. Army to characterize the steady state acoustics and measure the maneuver noise of a Bell Helicopter 430 aircraft was accomplished. The test occurred during June/July, 2011 at Eglin Air Force Base, Florida. This test gathered a total of 410 data points over 10 test days and compiled an extensive data base of dynamic maneuver measurements. Three microphone configurations with up to 31 microphones in each configuration were used to acquire acoustic data. Aircraft data included DGPS, aircraft state and rotor state information. This paper provides an overview of the test.read more
Citations
More filters
Journal ArticleDOI
Time frequency analysis of sound from a maneuvering rotorcraft
TL;DR: In this paper, the acoustic signatures produced by a full-scale, Bell 430 helicopter during steady-level flight and transient roll-right maneuvers are analyzed by way of time-frequency analysis.
Journal ArticleDOI
Development of a tunnel-in-the-sky display for helicopter noise abatement procedures
TL;DR: In this article, a pilot assistant display for following prescribed noise-optimised landing procedures is presented, which allows the pilot to anticipate the coming flight path and reduce pilot workload during complex manoeuvres.
A Maneuvering Flight Noise Model for Helicopter Mission Planning
TL;DR: In this paper, a new model for estimating the noise radiation during maneuvering flight is developed, which 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.
Measurement and Characterization of Helicopter Noise at Different Altitudes
TL;DR: In this paper, the authors present an overview of a flight test campaign performed at different test sites whose altitudes ranged from 0 to 7000 feet above mean sea level (AMSL) between September 2014 and February 2015.
References
More filters
Journal ArticleDOI
Flight-Path Management/Control Methodology to Reduce Helicopter Blade-Vortex Interaction Noise
TL;DR: In this article, a quasi-static acoustic mapping method was developed to predict rotorcraft extern noise by taking advantage of an expansion, to first order, about a solution to the helicopter no dimensional-state trim equations to include the effects of acceleration parallel to the flight path and X-fo c anges on radiated noise.
Flight Acoustic Testing and Data Acquisition For the Rotor Noise Model (RNM)
TL;DR: In this paper, the RNM/ART (Acoustic Repropagation Technique) process is demonstrated using measured acoustic data for the MD600N, and modifications are proposed to more accurately define vehicle and rotor orientation.
Measurement and Characterization of Helicopter Noise in Steady-State and Maneuvering Flight
Fredric H. Schmitz,Eric Greenwood,Richard D. Sickenberger,Gaurav Gopalan,Ben Well-C Sim,David A. Conner,Ernesto Moralez,William A. Decker +7 more
TL;DR: It is shown experimentally, that microphones close to the helicopter can be used to estimate the specific noise sources that radiate to the far field, if the microphones are positioned correctly relative to the noise source.