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A study of sound generation in subsonic rotors, volume 2
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Clark, L. T. Chalupnik, J. D. |
| Copyright Year | 1975 |
| Description | Computer programs were developed for use in the analysis of sound generation by subsonic rotors. Program AIRFOIL computes the spectrum of radiated sound from a single airfoil immersed in a laminar flow field. Program ROTOR extends this to a rotating frame, and provides a model for sound generation in subsonic rotors. The program also computes tone sound generation due to steady state forces on the blades. Program TONE uses a moving source analysis to generate a time series for an array of forces moving in a circular path. The resultant time series are than Fourier transformed to render the results in spectral form. Program SDATA is a standard time series analysis package. It reads in two discrete time series and forms auto and cross covariances and normalizes these to form correlations. The program then transforms the covariances to yield auto and cross power spectra by means of a Fourier transformation. |
| File Size | 4103557 |
| Page Count | 64 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19760011033 |
| Archival Resource Key | ark:/13960/t4vj0b009 |
| Language | English |
| Publisher Date | 1975-01-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Correlation Fourier Transformation Subsonic Speed Time Series Analysis Rotors Airfoils Noise Spectra Computer Programs Fortran Sound Propagation Covariance Rotor Blades Turbomachinery Aircraft Noise Wakes Mathematical Models Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
