详情

原文传递 Noise Measurements from Ground Tests of the Moog SureFly Vehicle.

题名：	Noise Measurements from Ground Tests of the Moog SureFly Vehicle.
作者：	Huff, D. L; Henderson, B. S; Cluts, J. D; Bennett, J; Jantzen, J.
关键词：	Acoustics##Rotorcraft##Urban air mobility
摘要：	Noise measurements from a ground test of a small vertical lift research vehicle are presented. Theproof-of-concept all-electric vehicle called “SureFly” was developed by Moog, Inc. A cooperative effortbetween NASA and Moog, Inc. has led to one of the first acoustic test datasets from an Urban AirMobility (UAM) vehicle being developed for passenger and cargo. Results show propeller and possiblymotor tones are important for the overall noise levels. The vehicle has four support arms each with a pairof contra-rotating propellers. Noise measurements show higher noise levels from the lower propellers,likely due to inflow distortion from the arms and top propellers. Possible motor noise was identified bycalculating harmonics of the line frequency and comparing to the tones in the narrowband acousticspectra and phased microphone array data. The acoustic far field was found to be about 100 ft away fromthe vehicle, but additional microphones are needed to provide a better assessment. Results show thepresence of modulation for some test conditions. The work reported here is only for ground tests.
总页数：	60 pages