1. Results of Eddy Current Analysis
Of the DCLL TBM
June 23, 2005
M. Ulrickson
Presented 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.

2. Summary 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 MN

3. 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.

4. Fmod Backplate

5. FX Backplate

6. Fz Backplate

7. Fmod Grid

8. Fx Grid

9. Fy Grid

10. Fz Grid (front)

11. Fz Grid (reverse side)