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NASA-CR-114761: Component noise variables of a light observation helicopte
Abstract: A test program was conducted to isolate and evaluate the individual noise sources of a light helicopter. To accomplish this, the helicopter was mounted on a special test rig, at a 6-foot skid height, in a simulated hover. ...
NASA-CR-1712: Study and development of turbofan nacelle modifications to minimize fan-compressor noise radiation. Volume 2 - Acoustic lining development
Abstract: Development of acoustic lining for turbofan nacelle modification to minimize fan compressor noise radiation.
NASA-CR-114760: Noise levels of operational helicopters of the OH-6 type designed to meet the LOH mission
Abstract: Formulas relating overall sound pressure level (OASPL) to parameters such as horsepower required, tip speed, and thrust for main and tail rotors are presented for standard and quieted helicopters. Formulas relating OASPL ...
NASA-CR-3813: Propeller aircraft interior noise model
Abstract: A computer program entitled PAIN (Propeller Aircraft Interior Noise) has been developed to permit calculation of the sound levels in the cabin of a propeller-driven airplane. The fuselage is modeled as a cylinder with a ...
NASA-CR-114649: Aircraft noise source and contour estimation
Abstract: Calculation procedures are presented for predicting the noise-time histories and noise contours (footprints) of five basic types of aircraft; turbojet, turofan, turboprop, V/STOL, and helicopter. The procedures have been ...