Acoustic performance evaluation of an advanced UH-1 helicopter main rotor systemAn experimental investigation of the high-speed impulsive noise characteristics of an advanced main rotor system for the UH-1 helicopter has been conducted. Models of both the advanced main rotor system and the UH-1 main rotor system were tested at one-quarter scale in the Langley 4- by 7-meter (V/STOL) Tunnel using the General Rotor Model System (GRMS). Tests were conducted over a range of simulated flight and descent velocities. The tunnel was operated in the open-throat configuration with acoustic treatment to improve the acoustic characteristics of the test chamber. In-plane acoustic measurements of the high-speed impulsive noise demonstrated a 7 to 8 dB reduction in noise generation is available by using the advanced rotor system on the UH-1 helicopter.
Document ID
19810049548
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hoad, D. R. (NASA Langley Research Center Hampton, VA, United States)
Conner, D. A. (NASA Langley Research Center Structures Laboratory, Hampton, Va., United States)