Results of Eddy Current Analysis

Of the DCLL TBM

June 23, 2005

M. UlricksonPresented on the TBM Conference Call

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,for the United States Department of Energy’s National Nuclear Security Administration

under contract DE-AC04-94AL85000.

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• There is a considerable torque about the center of the TBM

• There is a large twisting force trying to make a propeller blade

• The grids and the back plate have the greatest forces

• Forces are in the range of 100-1000 MN

Summary

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Background Info

• Time slice shown is at the time of maximum eddy current (20 ms into a 40 ms linear decay)

• The units on the plots are force density (N/mm3)• The force pattern is very complex and must be

input into a finite element program to calculate stresses and loads.

• A fully time dependent calculation will have to be done eventually.

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Fmod Backplate

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FX Backplate

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Fz Backplate

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Fmod Grid

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Fx Grid

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Fy Grid

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Fz Grid (front)

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Fz Grid (reverse side)