AHS and Royal Aeronautical Society, Technical Specialists' Meeting on Rotorcraft Acoustics/Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings
Abstract
The present conference discusses helicopter blade-vortex interaction (BVI) sound generation and directionality, shock waves in high speed helicopter rotors, higher-harmonic control of BVI noise, blade elasticity effects in VBI prediction, transonic BVI noise reduction, far-field acoustic characteristics of tilt-rotor advanced blades in hover, tilt-rotor ground-noise reduction, and the validation of 'quiet tail rotor' technology. Also discussed are the 'NOTAR' system, an acoustical analysis of gear housing vibration, tilt-rotor interior noise, human response to helicopter noise, frequency-shaped control of active isolators, a CFD potential method for tilt rotors, rotor wake modeling for noise prediction, passive drag reduction for a helicopter rotor airfoil, and helicopter noise standards. (For individual items see A93-29402 to A93-29430, A93-29432 to A93-29443)
- Publication:
-
AHS International Specialists' Meeting on Rotorcraft Basic Research
- Pub Date:
- 1991
- Bibcode:
- 1991ahs..proc......
- Keywords:
-
- Aeroacoustics;
- Conferences;
- Noise Prediction (Aircraft);
- Noise Reduction;
- Rotary Wings;
- Acoustic Propagation;
- Aerodynamic Loads;
- Blade Slap Noise;
- Blade-Vortex Interaction;
- Computer Programs;
- Harmonic Control;
- Helicopter Design;
- Interactional Aerodynamics;
- Propeller Noise;
- Rotor Aerodynamics;
- Shock Discontinuity;
- Shock Wave Interaction;
- Tilt Rotor Aircraft;
- Unsteady Aerodynamics;
- Wind Tunnel Tests;
- Acoustics