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NASA-CR-2066: Computer program user's manual for advanced general aviation propeller study
Abstract: A user\'s manual is presented for a computer program for predicting the performance (static, flight, and reverse), noise, weight and cost of propellers for advanced general aviation aircraft of the 1980 time period. Complete ...
NASA-TM-83199 PART 3: Aircraft Noise Prediction Program theoretical manual: Propeller aerodynamics and noise
Abstract: The prediction sequence used in the aircraft noise prediction program (ANOPP) is described. The elements of the sequence are called program modules. The first group of modules analyzes the propeller geometry, the aerodynamics, ...
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-198300: Aircraft Noise Prediction Program (ANOPP) Fan Noise Prediction for Small Engines
Abstract: The Fan Noise Module of ANOPP is used to predict the broadband noise and pure tones for axial flow compressors or fans. The module, based on the method developed by M. F. Heidmann, uses empirical functions to predict fan ...
NASA-TM-83199 PART 4: Aircraft noise prediction program theoretical manual: Rotorcraft System Noise Prediction System (ROTONET), part 4
Abstract: This document describes the theoretical methods used in the rotorcraft noise prediction system (ROTONET), which is a part of the NASA Aircraft Noise Prediction Program (ANOPP). The ANOPP code consists of an executive, ...
NACA-TM-1195: On the Sound Field of a Rotating Propelle
Abstract: The sound field of a rotating propeller is teated theoretically on the basis of aerodynamic principles. For the lower harmonics, the directional characteristics and the radiated sound energy are determined and are in ...