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Updated Results for the Wake Vortex Inverse ModelNorthWest Research Associates (NWRA) has developed an Inverse Model for inverting aircraft wake vortex data. The objective of the inverse modeling is to obtain estimates of the vortex circulation decay and crosswind vertical profiles, using time history measurements of the lateral and vertical position of aircraft vortices. The Inverse Model performs iterative forward model runs using estimates of vortex parameters, vertical crosswind profiles, and vortex circulation as a function of wake age. Iterations are performed until a user-defined criterion is satisfied. Outputs from an Inverse Model run are the best estimates of the time history of the vortex circulation derived from the observed data, the vertical crosswind profile, and several vortex parameters. The forward model, named SHRAPA, used in this inverse modeling is a modified version of the Shear-APA model, and it is described in Section 2 of this document. Details of the Inverse Model are presented in Section 3. The Inverse Model was applied to lidar-observed vortex data at three airports: FAA acquired data from San Francisco International Airport (SFO) and Denver International Airport (DEN), and NASA acquired data from Memphis International Airport (MEM). The results are compared with observed data. This Inverse Model validation is documented in Section 4. A summary is given in Section 5. A user's guide for the inverse wake vortex model is presented in a separate NorthWest Research Associates technical report (Lai and Delisi, 2007a).
Document ID
20100003341
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Robins, Robert E. (Northwest Research Associates, Inc. Redmond, WA, United States)
Lai, David Y. (Northwest Research Associates, Inc. Redmond, WA, United States)
Delisi, Donald P. (Northwest Research Associates, Inc. Redmond, WA, United States)
Mellman, George R. (Northwest Research Associates, Inc. Redmond, WA, United States)
Date Acquired
August 25, 2013
Publication Date
October 1, 2008
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
LF99-9847
NWRA-SEA-08-R368
Funding Number(s)
WBS: WBS 411931.02.61.07.01
CONTRACT_GRANT: NNL06AC78T
Distribution Limits
Public
Copyright
Public Use Permitted.

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