Test readiness review ESA ’s prototype

BLANC P-E LAMLyon October 2003

Mechanical test plan

Schedule

•Behavior of the clamp and Zerodur bar in the cold condition

•Sine low level (check the numerical analysis)

•Qualification sine test and random test (after optical test)

•Implementation for the cold test

•Conclusions

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Dummy mirror line

Shim (under clamp)

Behavior of the clamp (and the Zerodur)in the cold condition

Temperature probe (5)

Liquid nitrogen entrance

Icebox

Specimen (inside)

Specimen equipped

How

Star the test Check the parameters

Specimen in the liquid nitrogen view from outside

Temperature probe

Clamp

Dummy mirror line

Vibration test

•Sine low level (check the numerical analysis) done

•Qualification sine test and random test (after optical test)

Dummy (aluminum) stack

Shaker interface

4 x 3 screw M4

Dummy (zerodur) mirror line

X

Z

Displacement probe

Displacement probe Y

Driver 1

Driver 2

Driver 3

Dummy (aluminum) mirror line

Probe 3 axis (5)

Specimen equipped

Driver (3)

Hz

g

0,5g

20Hz 2000Hz2oct/mn = 3’19"

Hz

g

20g

20Hz 100Hz2oct/mn = 2’10"

5Hz

1g

Sine low level (on each axis) done

Qualification sine (on each axis)

-15dB

-12dB

-9dB

-6dB

-3dB

0dB

s

dB

30s 30sTiming = 3 mn

1,86g RMS

10,5g RMS

2 mn

2,63g RMS

3,72g RMS

5,26g RMS

7,43g RMS

Hz

g2/Hz

0,15g2/Hz

100Hz 400HzTiming = 2’

20Hz

0,03g2/Hz

2000Hz

0dB

3dB/oc

t -5dB/oct

10,5g RMS

0,01g2/Hz

Random(on each axis)

Vacuum chamber

Radiation shield 500 x 460 (aluminum)

Cold plate 500 (aluminum)

Entrance window150

Exit window 150

Cryostat of the university of Durham

Cryogenic cooler (2)

Implementation forthe cold test

Cold plate 500

(aluminum)

Ring interface (aluminum)

Foot (aluminum)

Bipod arm (G10)

Screw

Bipod node(Stainless steel or invar)

Isostatic 3 point mount

Bracket(invar)

Conclusions

• Test of the clamping done Nothing broken so the result is OK

•Sine low level doneI haven’t enough time to give an conclusion (see the report)

•Vibration test (qualification sine and random)in accordance to our shaker, we suggest this profile (qualification sine and random) to test the prototype

•Implementation status (in progress)