Alveolar Envelop

cageysyndicateUrban and Civil

Nov 15, 2013 (3 years and 6 months ago)

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CCLRC Engineering and Instrumentatio
n Department


Project Engineering Division


Mechanical Design Group

TEST REPORT

ADR050/014





CANTILEVER STAND

ATLAS SCT EC Assembly and Integration Tooling 14
TH

July 2005


Location: ADR050/Documents/

P
rint Date:
16/11/2013

@
07:57


Page
1

of
3


OBJECTIVE

Using the lead blankets, load up the Cantilever Stand beam and measure the actual deflection for the
given load.

The analysis carried out using ANSYS, showed t
hat with a load of 300kg at

the centre of
gravity of the SCT EC,
gave a 10mm movement

at the end of the beam,
due to a small deflecti
on at the
tower.
This early analysis showed that without the platform, the stand

arms have a safety factor of 5,
the beam and tower parts

a safety factor of 10 to 15.


CANTILEVER STAND DESIGN

0
-
TB
-
0065
-
012
-
00
-
C Cantilever Stand Scheme

0
-
TB
-
00650100
-
00
-
A Cantilever Stand Assembly


The cantilever stand is a welded construction using mild steel hollow sections. The sections 50x50x6
square and 250x150x5 rectangular cold
-
formed hollow sections EN10210.


The t
wo Cantilever Stands were manufactured by The Wantage Engineering CO LTD,

Reference: ADR050/Job389


The cantilever stand has been designed so that th
e centre of gravity of the SCT End C
ap is inside the
front arms. The beam is attached to the tower and has

an overhang of 2885mm and would be set at a
height of 1687mm to match the TRT. For our test the initial height may differ.



Approx overall mass of Cantilever Stand is 1140kg



The beam mass of 120kg is included in the overall mass


There are four main jacks

located at the end of each platform arm, these
provide stability and
adjustment

and take the main loading
. Two further jacks have been added to prevent unwanted
movement of the platform during final assembly of the SCT.



LOADING

The SCT End Cap has mass
of 250kg with the centre of gravity mid point along cylinder.


TEST PLAN

1.

Step one set up the Cantilever Stand to be fully supported on the main four jacks only.

2.

Take measurement at the beam end to the floor (to improve
the accuracy of this
measurement
a me
tal plate was positioned on the floor at the measurement point).

3.

Load the beam with the lead
blanke
t
s

at 1000mm from the end (the lead blankets were placed
either side of this position).

4.

Take measurement with beam under normal load.

5.

Move lead blankets to
end of beam position,

either side of the 275
mm position.

6.

Take measuremen
t with beam under this moved

load.

7.

Rem
ove lead blankets and take measurement reading

under no load to compare with initial
measurement

We have 28
lead blankets at 10kg each =

280kg



R
ESULTS


Load


Mass (kg)

Position of Load

from end of beam (mm)

Measurement (mm)

Zero

None

1624

280

1000

(blankets either side of this point)

1619

280

275 (blankets either side of this point)

1616

Zero

None

1624




Normal position deflection was (1624
-
1
619=
5mm) 5mm



Load close to end of beam (1624
-
1616=8mm) 8mm


CCLRC Engineering and Instrumentatio
n Department


Project Engineering Division


Mechanical Design Group

TEST REPORT

ADR050/014





CANTILEVER STAND

ATLAS SCT EC Assembly and Integration Tooling 14
TH

July 2005


Location: ADR050/Documents/

P
rint Date:
16/11/2013

@
07:57


Page
2

of
3

PHOTOS








Figure 1


End of beam measurement with no load (1624mm recorded)







Figure 2


Cantilever Stand Beam loaded with lead blankets
either side of 1000mm,

nominal position
for
C
entre
of

G
ravity

of SCT EC.






Figure 3 & 4


End of beam
measure under nominal load of 28
0kg (actual measurement was 1619mm
difficult to keep rule still during photo)


CCLRC Engineering and Instrumentatio
n Department


Project Engineering Division


Mechanical Design Group

TEST REPORT

ADR050/014





CANTILEVER STAND

ATLAS SCT EC Assembly and Integration Tooling 14
TH

July 2005


Location: ADR050/Documents/

P
rint Date:
16/11/2013

@
07:57


Page
3

of
3









Figu
re 5 & 6


Lead blankets moved to 275mm position and measurement taken.



CONCLUSION

The stand design was strengthened after the initial FEA analysis, which would account for the reduced
deflection from the predicted 10mm to only 5mm.


The stand performs
as predicted and will support the SCT EC as required. Care will be needed
during
the

fitting of the front support
, when
the load is transferred from the beam to the bridge support. Two
types of beam holding devices are under consideration to

prevent the be
am movement

during this
operation.


The stand has a mass of 1140kg and is not easy to move, once positioned it should remain in place
until no longer required. The jack system works, but has limited mechanical advantage, the jacks are
stiff to operate/move

fully loaded, will need to be well greased for this operation. The side adjustment
system should also be greased for the setting up operation for the same reason.



B Smith

R66 Mechanical Design Group (RAL)