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Discrete gust model for launch vehicle assessments
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Leahy, Frank B. |
| Copyright Year | 2008 |
| Description | Analysis of spacecraft vehicle responses to atmospheric wind gusts during flight is important in the establishment of vehicle design structural requirements and operational capability. Typically, wind gust models can be either a spectral type determined by a random process having a wide range of wavelengths, or a discrete type having a single gust of predetermined magnitude and shape. Classical discrete models used by NASA during the Apollo and Space Shuttle Programs included a 9 m/sec quasi-square-wave gust with variable wavelength from 60 to 300 m. A later study derived discrete gust from a military specification (MIL-SPEC) document that used a "1-cosine" shape. The MIL-SPEC document contains a curve of non-dimensional gust magnitude as a function of non-dimensional gust half-wavelength based on the Dryden spectral model, but fails to list the equation necessary to reproduce the curve. Therefore, previous studies could only estimate a value of gust magnitude from the curve, or attempt to fit a function to it. This paper presents the development of the MIL-SPEC curve, and provides the necessary information to calculate discrete gust magnitudes as a function of both gust half-wavelength and the desired probability level of exceeding a specified gust magnitude. |
| File Size | 700827 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20080014847 |
| Archival Resource Key | ark:/13960/t0ns5qt4w |
| Language | English |
| Publisher Date | 2008-01-20 |
| Access Restriction | Open |
| Subject Keyword | Launch Vehicles And Launch Operations Launch Vehicles Spectral Theory Specifications Space Shuttles Probability Theory Dynamic Models Gusts Discrete Functions Gust Loads Curve Fitting Wind Meteorology Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
