An Optics-Based Tip-Path Plane Tracking System for Rotorcraft Applications

Sickenberger, Richard; Schmitz, Fredric H.

doi:10.2514/6.2008-7315

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Fast Pitch Up From Descending Flight1

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2020

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“…The rotor tip-path-plane was shown to maintain its orientation with respect to the fuselage within 1 throughout the maneuver using an optical tip-path-plane tracking system (Ref. 23) developed by the University of Maryland. Figure 6 shows the predicted OASPL time histories for the three levels of modeling, as compared to the measured values at each microphone location.…”

Section: Fast Pitch Up From Descending Flightmentioning

confidence: 99%

A Maneuvering Flight Noise Model for Helicopter Mission Planning

Greenwood¹,

Rau²

2020

j am helicopter soc

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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.

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Section: Fast Pitch Up From Descending Flightmentioning

confidence: 99%