after considerable pushing and shoving, this configuration show some promise. i have taken some...

After considerable pushing and shoving, this configuration show some promise.

I have taken some liberties with the geometry and turned mounts inside-out from earlier versions.

Long Primary struts

Fold-Flat mounts on both sides

FIDO face mounts

Tertiary edge mountsQuad “Butterfly” Filter Pack

Long Primary struts

Hard Points Lined up along common axes

All mounts have 6 point mounts to the Optical element,3 point mounts to the structural element

Face and Edge mounted Optical elements

Ignore the HexapodA Newer better actuator is on the way

The Yellow elements areEnvelopes that defineLoad paths and vertexes

When their positions settle down, real hardware will be inserted

Yellow Envelopes also define Fiducials and reference planes, the CAD equivalent of GSE( Ignore them )

CFRP Triangular Beams

Quad “Butterfly” Filter/Shutter Package

The 3 beams pick up all Optical mountsTertiaryFoldFlatFIDO and Quad Filter assemblyCosmic Ray ShieldCryostat

CFRP Shear panels and Bulkhead “Candybox”

Note Filter housing

Candybox Interface occursAt or near Primary hard points

CFRP Triangular Beam Assembly

CFRP webbed pan integrated onto the Beam assembly

Top face is not shown

Spacecraft structure picks up OTAAt three points on a hard ring

This surface forms the platform for the Secondary Assembly

This surface forms the platform for the Baffle and Solar array

This approach works for most of our earlier metering concepts

Solves some of the 3x vs 4x symmetry problems

3-Vane ,Trapezoid section

This approach works for most of our earlier metering concepts


6-strut, tubular section, Full-length

4-Vane ,Trapezoid sectionThis approach works for most of our earlier metering concepts


Shown here is a 4-Vane (trapezoidal cross-section) secondary metering structureOn a spacer ring

This configuration allows us to tune the resonant frequency of the strut by adjusting the spacer height

The build-up sequence looks like this from the bottom

“Candybox” Beam Assembly

Primary Bench Beam assembly

Primary Benchintegrated

1 of 3 points that index the Primary Bench to the Candybox

Candybox Indexed to Primary Bench beams

Candybox

Primary Bench

25dm Baffle Assembly

Envelope for Baffle structure, MLIAnd Solar Array

Note that the hard Ring is Lower than earlier versions

6 strut assembly3 point mount at OTA,6 point mount and S/C pan

THE FITUP looks like this….

25dm Baffle

Support structure and MLI not shown

Solar Array

Spacecraft structure

VOILA !

No obvious interferences.

Plenty of room for FIDO electronicsclose to the detector.

Tuneable secondary structure

Room for FIDO radiator.

Thermal and kinematic isolation between Baffles, Spacecraft, and OTAseems doable

Really lousy interface between the ‘Candy box’ and the Primary bench

So………

Here it is in rough form.

My immediate question is:

Can these radical mounts be made to work ? Have I violated good-practice conventions, or overlooked something?

If this works for you, the next thing to do is to integrate it with the current Baffle, and the Current Secondary structure.

Details for the mount geometry

Are previewed on the following pages.

CAD files are available in several formats

At: http://www-eng.lbl.gov/~lafever/SNAP/Snap_13/

Details and True-Length dimensions for

FIDO

Dimensioned CAD versions of this file are also available in several formats: .pdf, .mi, and .dxfAt: http://www-eng.lbl.gov/~lafever/SNAP/Snap_13/


FoldFlat



Primary



Tertiary


after considerable pushing and shoving, this configuration show some promise. i have taken some...

Documents

point mounts

baffle structure

primary benchsohere

radical mounts

current secondary structure

current baffle

common axesall mounts

shownspacecraft structure