Results of vertical and horizontal shock tests on type 200 VLR nitrogen tank are given

Wevers, L. J.

English

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NASA TECHNICAL MEMORANDUM
	
NASA TM-77747
SHOCK TESTING Of A NITROGENTANK(CRYO DIFFUSION
TYPE 220 VLR)ON THE MIDDLE WEIGHT SHOCK STAND
L.J. Wevers
(NASA-TM-77747)	 S11OLK '11,STING OF A NI3FCGEN
	 1465-151 63
TANK (CRYO DIFFCSICN 4YPE 220 VLR) CN THE
RIDDLE WLIGUT SNCLK SAND (Naticnal
Aeronautics and $Face Administration)
	 16 p	 Unc.LaE
NC A02/MY Aul
	 CSCL 20K G3/39 11019
Translation of "Schokbeproeving van can stikstofvat (Cryo Diffusion
Type 220 VLR) op de middengewicht schokbank," Institute TNO for Mechani-
cal Constructions, Delft (Netherlands), November 1972.
Report-4848/27, pp. 1-15
a
q6
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
WASHINGTON, D.C. 20546	 DECEMBER 1.984
CSTANDARD T ITLE PAGE
I. Repel No.
NASA TM-77747
I. Goverment Acceaelon N•. ). Redplenl'i C•t•bo me.
A. TUb and SuNitb S. Repoli Dole
December 1984
/. l awfasaIno Droonfulfon Code
SHOCK TL'STINgor A NITROGEN TANK ^RYO DIPPUSION
TYPE 220 VLR)ON THE MIDDLE WEIGHT SHOCK STAND
7. AuC+•r(d L	 Repast No.
L. J. Wevers
ID. Mork Unit No.
i. Petlotming Drgoni ration Hems and Addnu
Leo Kanner Associates
11.	 Contacts of Giant No.
NASW-4005
17. Typo of Report coil Period coviaARedwood City, California 94063
Translation
17. ipensoung Agency Home and Address
National Aeronautics and Space Administration
Washington, D.C. 20546
id.	 Sp•ne•ring Agency Code
IS,	 Su;;ler•.entcry Notes
Translation of t'Schokbeproeving van een stikstofvat (Cryo Diffusion
Type 220 VLR) op de middengewiclit schokbank, t' Institute TNO for Mechani-
cal Constructions, Delft (Netherlands), November, 1972. Report-4848/27,
PP • 	1-15.
L5 X o k
le.	 ^atra^t
Results of shock tests on type 200 VLR nitrogen tank are given.
t
4Keyt 17.	 Was" (Stlecte0 by Author(l)) 10.	 Dlsttibution Statement
Unclassified - Unlimited
It.	 lscunly Ctasell. (ol rhle
	
.P"'l) 79.	 Secaruy Cloesll. (of this pave) 71. N•. of Page$ 77.
Unclassified Unclassified 14
u
I
Pl.`
SHOCK TESTING OF A NITROGEN TANK (CRYO DIFFUSION TYPE. 220 VLR)ON THE
MIDDLE WEIGHT SHOCK STAND
L. J. Weavers
Institute TNO for Mechanical Constructions, Delft
I. INTRODUCTION
	 /1*
At the order of the Federal defense organization TNO in behalf of
the Ministry of Defense (Navy), a nitrogen tank, type 200 VLR, of the
Cryoson Technical Laboratory at Mididenbeemster was shock tested. The test
was performed in the laboratory of the Institute TNO for Mechanical
Constructions at Delft on the Middle weight Shock stand.
The dates of the test were May 24 and 25, 1972.
The Ministry of Defense (Navy) had determined that the maximal
increase on the nitrogen tank, mounted on YS 50-75-LES springs, had to
be in the area between 6 and 8 g. (g = increase of the force of
e
gravitation). The apparatus had to be shocked in two directions
perpendicular to each other.
Altogether two shock tests have been made.
During the shocktests the movement of the surface and the movement
of the nitrogen tank were registered on a magnetic tape. The measuring
system is discussed extensively in /3/.
The filling degree of the nitrogen tank with the vertical test was
approximately 75%. For the horizontal test the filling degree was reduced
to 25%. The manufacturer Cryoson deemed this necessary for safety reasons.
*Numbers in the margin indicate pagination in the foreign text.
1
The damage inspection after each shocktest was done by the IWECO-TNO
as far as this was possible.
There was not found any indication of visible exterior damage.
The nitrogen tank was returned to the Optical Industry N.V. at Delft
after the tests.
2. MOUNTING OF THE NITROGEN TANK
	
/2
The IWECO has the nitrogen tank mounted to springs of the type
Yielding Strip 50-75 LES-decktype for the vertical as well as for the
horizontal test. The springs were somewhat modified by making normal
holes of the slits.
The pictures, figures 1 to 5, give a clear picture of the mounting.
It is indicated at the pictures where the movements of the nitrogen tank
are measured during the shocktests.
9
n
3
'	 4W 'yoa	 q
3. SETUP OF THE MIDDLE WEIGHT SHOCK STAND
	 /3
The work method of the shock stand is not discussed in the present
report. Reference to this has been made to /1/ and /3/.
The setup of the stand with the tests performed is found in Table I.
TABLE I
a b e f Voorspanning g h	 Masse Is
Schok Schotelveren Slag Rubber-
NO. Druk	 Trek Inn)
01
Trek	 Oruk vere^
Hul -	 AD	 DD.
,constr.
c	 d Ikal	 Rgl
246 16/32 12/24 10 2 2 6 300 208
247 16/32 12/24 10 2 2 6 300 146
Key: (a) Shock No.; (b) Disk springs; (c) Pressure; (d) Pull;
(e) Beat; (f) Advance tension; (g) Rubber springs; (h) Masses;
(i) Auxiliary construction
4
4. MEASUREMENT RESULTS
	
/a
In the figures 6 to 9 the time functions are found of the signals
measured. In Table 2 the maximum values are given.
The maximum increase on the nitrogen tank was for the vertical and
for the horizontal test in the increase area between 6 and 8 g. The
remaining deformations of the YS-springs were between I and 3 mm.
TABLE i
d
e
f
8
Beweging van heta
pUteau
c Schok 246	 Schok 247
b	 Beweging van het
stikstof at
	 rx
Schok 246	 Schok 247
Versnelling Im.s 21 330 280 54 80/47
Snelheld	 Im.s' ll 0,95 1,10 0,59 0,41/0,44
Verplaatsing	 110" 3 2.2 16/21)" 19
Vertraging	 lo o s-2 1 110 loo 54 93/60
T 1
	(10"3s 10 70 30 22/30
T2
	
110-3s 9 BO -
) x The first and the second figure indicate the value of the first and
the second recorder, respectively.
TI = the time in which the maximum speed is reached.
T2 = the vibration time of the surface of the shock stand.
)xx the channels 4 and 7, respectively.
Key: (a) Movement of the surface; (b) Movement of the nitrogen tank;
(c) Shock; (d) Speed increase; (e) Speed; (f) Displacement;
(g) Speed decrease
5
v r
	 0:) Ce r-cssC
: ► 	 vCr he' St"'Istofvat
b
ver;,t^ntS r9so p nemer 110)
P rr
/4
1	 /	 C
	
as he: Schokbark p!^_teau
d vPratcctS rSs'%pr.vrr er J7 hp! Scn,r?ork plarecu
Fig. 1. View from the left side
Key: (a) speed recorder of the mass of the nitrogen tank; (b)
displacement recorder; (c) s peed recorder of the shock stand
surface; (d) displacement recorder on the shock stand surface
G
..r ..r J
}f
OF PG
Fig. 2. Detail of the displacement recorder and of the
YS confirmation
/5
7
wu	
`/
is	 2 s +jls . #, ► ntcc^swgs-
a	 c,rom,vrs
i
-TV I
OR iCNII.'
OF PGA..	 .
Fig. 3. View from the right side of the vertical test
Frey: (a) Z displacement recorders
/7
IT-
Fig. 4. Horizontal test
8
a
vra-c;ts nns •^
OPMP er
vlr snelI Ings-
0o"emN
)kCnrlo ( 7)
tp.
^r
b v e( ,.nr I.rgsoPf%V"r (kCnOW G)
-4S
I	 C 
rer^!x • sngso^r^mer Ikoncal 9;
ya-rS-1!I r jso:prar-r
Fig. S. 'leasurement areas for the horizontal test
Key: (a) displacement recorder; (b) speed recorder (channel 4);
(c) displacement recorder (channel 9)
9
/s
%	 a SG^to
A
1S.IO^A	 .
A
i
•v
a, 8 tom..
^	 ^^^-'^^ ^	 •'rte
fFig. 6, Movement of the surface
	 •_
Key: (a) Shock 246
OF, PDOr,
A
1
to
f:
i
A.
6 . :.	 J,y'
/9
OF
a
IT 1j'A
OI L I TA 471
J
^	 a
4
b	 t
ls• uk L ^	 ^ ^	 I	 I 	 I
Fig. 7. Movement of the nitrogen tank
Key: (a) Shock 246; (b) displacement recorder
i.+
I
i
W,
11
i
^i	 j
4---
a mcho k 247
/io
I	 ,
I	 '	 ^
I
a,I fAw
Fig. 8. Movement of the surface	 I
Key: (a) Shock 247	 I`
OF PO`., c. _
h
	 a 5 C. h ') k 2 147
t	 ^ Q Vol" 4 	'^
htrl	 „^	 ^ t	 ^ ^' 1
	 ^	 1	 .t ^ ^	 '	
^
/ ► 1
Is, IG 6
j	 ^	 1
Fig. 9. Movement of the nitrogen tank
Key: (a) Shock 247; (U) channel
.o VARW-.
13
IS. LITERATURE
	
/12
a result of underwater explosions,"
SA 69126.
a result of underwater explosions,"
SA 69127.
e executed by IWECO-TNO," IWECO -
(1) Regoord, R. "Handbook for shock as
part 2, IWECO-report No. 4747/1,
(2) Regoord, R. "Handbook for shock as
part 3, IWECO-report No. 4747/1,
(3) Schulze, R.A.P.J. "Shocktests to b
Memo No. 6909/56, SA 69068.
14


Shock testing of a nitrogen tank (Cryo diffusion type 220 VLR) on the middle weight shock stand

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