Geometry Model Comparison

Old xmlGeoDbs tag v1r37p1 has homogeneous cylindrical “spacecraft”

Newest tag v1r39p3 has spacecraft consisting of several components. Also has additions to LAT mass (mechanical and electrical components).

Solar panels are unchanged

Component Comparison

Moving from old model to new

eliminate 1000 kg cylinder

add radiators, LAT electronics, XLAT plate to LAT (330 kg)

add spacecraft components primary structure, skirt, optical bench, propellant and tank, batteries (about 850 kg)

v1r39p3 Geometry

Batteries are boxes near

+Y and -Y sides of SC,

inside primary structure.

Orange panels are radiators

Optical bench is red box

just outside -X side of

primary structure, near LAT

Hydrazine tank is not

visible. It's just above

batteries.

LAT shell
+ electronics
+ prim. struct.

LAT Mass Comparison

Known missing

BEA

See also

http://www.slac.stanford.edu/exp/glast/ground/LATSoft/geometry/notes/massSummary.shtml

Geometry laundry list

More SC volumes (GBM, SC electronics boxes, reaction wheels)

ACD base frame and electronics assembly. Would account for about ½ of missing ACD mass

ACD screws and holes (overly symmetric acceptable?)

ACD side shingling

Better TKR tower model.

Better grid (current one is too light)

B1

B2

B3

B4

B5

B6

Side Shingling

inside

LAT

row 0

row 1

row 2

row 3

Actual shingling.

Rows 1 & 2 slanted

row 0

row 1

row 2

row 3

Current model. No

slant, no shingling

row 0

row 1

row 2

row 3

Shingling without

slant. This might

be easier to

implement.

Is it good enough?

Support

structure

Ribbon

Tile

2007-03-02T15:43:47