Production of synthetic winds for the Global Reference Atmosphere Model (GRAM)

Walterscheid, Richard L.; Sako, Brian H.; Aerospace Corporation

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Production of synthetic winds for the Global Reference Atmosphere Model (GRAM)

2010-12-15
By Walterscheid, Richard L. ; Sako, Brian H.

[PDF-824.15 KB]

English

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Creators:

Walterscheid, Richard L. ; Sako, Brian H.

Walterscheid, Richard L. ; Sako, Brian H. Less -
Corporate Creators:

Aerospace Corporation
Corporate Contributors:

John A. Volpe National Transportation Systems Center (U.S.) ; United States. Federal Aviation Administration. Office of the Associate Administrator for Commercial Space Transportation

John A. Volpe National Transportation Systems Center (U.S.) ; United States. Federal Aviation Administration. Office of the Associate Administrator for Commercial Space Transportation Less -
Subject/TRT Terms:

[+]

Commercial Spaceports Commercial Space Transportation Launch Vehicles Licensing Regulation Simulation Synthetic Winds Temporal Wind Effects Trajectory Wind
Publication/ Report Number:

ATR-2011(5585)-1
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Contractor final report; Feb 2010-Oct 2010
Corporate Publisher:

Aerospace Corporation
NTL Classification:

NTL-AVIATION-AVIATION
Abstract:

The Aerospace Corporation was tasked by the Volpe National Transportation systems Center to provide technical support to the Federal Aviation Administration, Office of Commercial Space Transportation (FAA/AST), in developing a method based on Principal Component Analysis (PCA) to generate synthetic winds that may be used for studies of aerodynamic loads and the dispersion of rocket trajectories. A notable feature of the analysis is that it is performed on winds separated in time by certain time deltas (30, 60, 120 minutes, etc.). This approach produces synthetic winds that preserve relevant statistics on the observed winds. These include the variance, spatial spectra, correlations between win components, and temporal decorrelation. This is different from synthetic winds computed with the Global Reference Atmosphere Model (GRAM) for example. The GRAM output has two main components: a deterministic monthly mean component . The two components are combined to give a realization that can be used for trajectory simulations. A difficulty with the present GRAM formulation for calculating temporal effects is that each realization of is uncorreleated with any other realization. In addition, the present GRAM predicts that the north-south and east-west components of the wind, u' and v', respectively, are uncorrelated and that the power spectral density of the wind components falls off less rapidly with decreasing wavelength than observed. We have developed an approach for calculating based on PCA that resolves all of these difficulties and that may be used with the deterministic part of GRAM to produce more realistic synthetic winds. The methodology and first results are presented herein.
Format:

PDF
Funding:

DTRT57-05-D-30103, Task 28;FA88B2/HS998
Collection(s):

Volpe Center
Main Document Checksum:

[+]

urn:sha256:7ca5680aee53fa6335f28a75ca49a5a366e7671678cd9bf2b92f6086266b0d7f
Download URL:

https://rosap.ntl.bts.gov/view/dot/34246/dot_34246_DS1.pdf
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Production of synthetic winds for the Global Reference Atmosphere Model (GRAM)

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