1. SO RPW Antenna FEM Details
Paul Turin
9/30/14

2. Materials

3. Materials Stacer Frame 6061-T6 Al Cleat 6061-T6 Al Stacer Insulator
Peek 450G (2)
Stacer Adapter Ti 6Al-4V
Hinge Yoke 6061-T6 Al
Hinge socket 6Al-4V Ti
Cage Base Ti 6Al-4V
Hinge Base 6061-T6 Al (2)
Cage Dog 303 SS (2)
Cage adaptor 6061-T6
Hinge Flexure Ti 6Al-4V
PZ Adapter 6061-T6 Al

4. Shells – Stacer Canister
Stacer canister is a .040” thick 6061-T6 tube

5. Shells - Boom Tube [(0/90)T300 / ((0)M60J)7 ]s From THEMIS:
Designed Lay-up
[(0/90)T300 / ((0)M60J)7 ]s
T300 = high-strength carbon fiber/epoxy woven (0.005”/ply), M55J = high-modulus carbon fiber/epoxy tape (0.002”/ply)
Boom tube modeled as a shell with isotropic properties. Currently 2.500”OD X
.035” thick to achieve 150Hz 1st mode using the properties developed for THEMIS
Tube Design
Thickness = in.
Outside diameter = in.
Effective Modulus = 33 x 106 psi (230 GPa)
Mass per unit length = 43 g/in (1.68 g/cm)

6. Remote Masses
SolidWorks Simulation accounts for the mass properties of non-modeled components using “Remote Masses”. The following slides depict all of the required remote masses for the nonstructural components of the antenna assembly. Masses are divided up between attachment points to avoid stiffening the structure.
For all of the following the origin is ” below (along Y) the center of the bolt pattern on the bottom of the Hinge Base (as shown at right). The STEP model should be in this coordinate system.
Note the magenta spheres denote the CG as given in the tables. Table dimensions are from the origin.
Hinge base

7. Hinge Mechanism

8. Preamp
Load shown is also applied to each of the mounting points shown with red arrows

9. Stacer Front

10. Stacer Rear

11. Main Heat Shield
Load shown is also applied to each of the mounting points shown with red arrows

12. DAD Heat Shield

13. Tube Heat Shield Rear

14. Tube Heat Shield Rear

15. Connectors
SolidWorks uses “Connectors” to model bearings, pins, bolts etc. The following slides depict all of the required connectors that control the interaction of the parts. Any touching faces are globally bonded. The shell elements od the CF tube and Stacer canister are bonded

16. Hinge Bearings
ball bearings – modeled as self-aligning with 3 rotational degrees of freedom

17. Caging Mechanism Latch Dog Pins
Latch Dogs (one each side) Swivel on pins
Pins same on the other side
Caging mechanism base
Single rotational degree of freedom SS pins

18. Caging Mechanism Latch Dogs
Spherical interfaces modeled as self-aligning ball bearings with 3 rotational degrees of freedom