 | United States. Office of Noise Abatement and Control - 1971 - 488 pages
...a discussion of the resources allocated to the noise program. Source Noise Research Rotating blade noise; - The generation and prediction of rotating...near the rotors and propagation of noise through the blade rows is being eupplemented with analytical studies to predict oscillating pressure loads and... | |
 | United States. Congress. House. Committee on Science and Astronautics - 1971 - 1222 pages
...70 and FY 71 in the areas of source, propagation and reception. SOURCE NOISE RESEARCH Rotating blade noise. — The generation and prediction of rotating...turbines. Tests of a multistage laboratory compressor to deter54 mine noise loads on the compressor case near the rotors and propagation of noise through the... | |
 | United States. Office of Noise Abatement - 1970 - 258 pages
...University (secondary airflows), and Pennsylvania State University (ionized particles). Rotating Blade Noise The generation and prediction of rotating blade...helicopter rotors, fans, compressors and turbines. Studies that relate particularly to propellers include the acoustic evaluation of resonators for ducted... | |
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... published in NASA SP 189, SP 207, and SP 220. Past congressional presentations also contain details of the NASA noise research programs. There follows a description of noise research conducted by NASA in FY 70 and FY 71 in the areas of source, propagation... 