Updated Results for the Wake Vortex Inverse ModelReport as inadecuate

 Updated Results for the Wake Vortex Inverse Model

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NorthWest 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 users guide for the inverse wake vortex model is presented in a separate NorthWest Research Associates technical report Lai and Delisi, 2007a.

Author: Robins, Robert E.; Lai, David Y.; Delisi, Donald P.; Mellman, George R

Source: https://archive.org/

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