LETTER (Sanitized)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002900010018-2
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 20
• Document Creation Date: December 28, 2016
• Document Release Date: June 8, 2005
• Sequence Number: 18
• Publication Date: August 6, 1965
• Content Type: LETTER

Approved For Release 2005/06/23 : CIA-RDP78B04770A002900010018-2
f -L
COMPLIMENTS OF CARLIS
Declass Review by NGA.
 Approved For Release 2005/06/23: CIA-RDP78B0477 .018-2
" ' STAT
MAILING ADDRESS
TAT
Aug. 6, 1965
Dear Bob and John:
Since the computer analysis of the floor slab fre-
quency in Chris' area was much lower than we expected,
we would like to verify our assumptions of the floor
construction. Attached is a sketch (Fig. lb) of the
floor structure and also attached are our assumptions
based on verbal information received in June. I believe
that confirming data can be obtained directly from
architects drawings, if they are available. Most
satisfactory procedure would be to send us a clean
copy of the architects floor structure drawing.
Regards.
STAT
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 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
Present
Assumption
Revised
Assumption
A. Concrete floor slab
thickness
B. Column cap thickness
C. Column Collar
Diameter
4 in.
D. Column Collar height,
to top of floor slab
50 in.
E. Column Diameter
F. Column center to center
distance
20 ft.
G. Reinforcing bar location
in concrete floor slab
(distance from top of slab)
8 in.
H. Concrete strength
1. Design load condition
2,000 psi.
uniform
200 lbs.
per sq. ft.
J. Reinforcing Rod
distribution
i" Diam.
Rods 6"
c-c both
waq.
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 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
Figure la Floor Slab Grid Framework
Figure lb Section.A'.A_ of-Floor Slab
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 TAT
Approved For Release 2005/06/23 : CIA-RDP78B04770A002900010018-2
August 5, 1965
Dear Bob N:
Enclosed is one copy of 4th Report on
Submicron Measuring.
Three copies were separately sent to John R
and two copies to the Contracting Officer.
Regards,
STAT
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 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
~t gust 5 , 196%
STAT
is
Submittal
Dear Sir:
Enclosed are tM copies of the 4th Pr*liwinorY
Tecbutc*l Report on Task 1. Item I "'Submricrof
sent Error Analysis$ of the eject contract.
additional copies were submitted under separate cover
on Au st 5, 1965 to the Tectnie*L epresentativ+e o
the Contracting O iaer.
Very truly yam'
STAT
AStws
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 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
-ugust 1, 196
Dear John R.
Enclosed are 3 copies of the 4th Report on
Submicron Measuring.
In addition, I sent one copy to Bob N and WO
copies to the Contracting Officer (as required by
terms of the contract).
he 4th report presents the results of the
computer analysis of the floor slab frequencies.
Thee fundamental was found to be 15.6 cps. This
is an important figure and should be verified with
better input data.
Regards
Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
July 30, 1965
Task II, Item 1, 4th Preliminary Technical Report
Item 1. Submicron Measurement Error Analysis
WORK STATEMENT
Evaluate the physical and metallurgical properties
of materials used in measuring engine construction
to determine comparative suitability to submicron
measuring. Materials to be considered are: Meehanite,
steel, granite, aluminum, magnesium, and glass, and
other materials'that may be particularly suitable.
Evaluate physical properties and structural concepts
appropriate to achievement of vibration levels and
structural rigidity compatible with submicron
measuring requirements. Evaluate methods of measuring
the small vibration levels expected in a high
performance structure.
Reports No. 1 and No. 2 dealt with the physical and metal-
lurgical properties of materials. Report No. 3 dealt
with structural rigidity and vibration control of the
machine structure. This report, No. 4, presents results
of a computer analysis of building floor vibration
frequency.
Submitted by:
STA
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 TAT
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Task II, Item 1,::4.thh Preliminary Technical Report
CONTENTS
1. Summary
2. Structural Dynamic Model of the Floor Slab
3. '_ Input Data
4. Output Data
5. Discussion of Results
LIST OF FIGURES AND TABLES
Figure la
Figure lb
Floor Slab Grid Framework
Section A-A of Floor Slab
Table
1
Tabulation of Input Data and Co
ncrete Floor
Table
2 '
Free Vibration Analysis
Tabulation of Mode Shapes and F
requencies
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 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
?
1. SUMMARY
A free vibration analysis of one typical bay of an
upper story floor of a building has been made. . The. floor
is a multiple bay slab-column structure. The purpose of
the. analysis was to determine the fundamental and higher
mode frequencies of the floor slab. Knowledge of the
floor frequencies is important to determine the inter-
action of floor with the vibration isolation system of
a projected submicron measuring machine.
The assumed floor structural dynamic model is shown
in Figure la and lb. The analysis was carried out by an
existing IBM 7094 routine. The result of the computation
indicates the fundamental frequency is 15.6 cycles per
second. If the data on the floor construction is accurate
the analysis will yield a 10% accurate fundamental fre-
quency. The fundamental frequency may therefore vary from.
14 to 17 cps. The computed 15.6 cps. fundamental floor
frequency is much lower than the 20 cps. to 65 cps. anti-
cipated in report No. 3. If the floor frequency is that
low, it would necessitate a machine vibration isolator
system of much lower natural frequency than the .8 cps.
suggested in report No. 3.
Before proceding further on the structure evaluation,
the floor frequencies will be reexamined with more accurate
data on the floor construction.
2. STRUCTURAL DYNAMIC MODEL OF THE FLOOR SLAB
Figure la shows the grid framework of the floor slab.
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 Approved For Release 2005/06/23 : CIA-RDP78B04770A002900010018-2..-
a9-
21 ~elll .. zz .z3/- z4-
/ i /
...240
Figure is Floor Slab Grid Framework
Figure lb Section.A-.A.. of .Floor Slab
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 Approved For Release 2005/06/23 : CIA-RDP78B04770A002900010018-2
Figure lb shows a cross section of the floor slab.
The assumptions of the floor slab model are:
(1) The effective depth of the members adjacent
to the columns is 32 inches.
(2) The effective depth (top fiber to the center
of reinforcing rod) of the remaining members
is 8 inches.
(3) The concrete strength is 2000 psi which.
results in Ec=2,000,000 psi.
(4) The, distributed concrete dead weight of the
slab is 125 psf.
(5) Members 3-26, 11-27, 15-28, and 23-29 in
Figure la are dummy members simulating the
stiffness of the adjacent floor bays'. Joints
1, 5, 21, 26, 27, 28, and 29 are restrained
in all directions.
INPUT DATA
Table I lists the-inputs data to the existing com-
puter program, LESAR, for the free vibration'analysis of
the 20'x20' concrete floor slab. The quantities are as
follows
(1) Joint Coordinates
There are three columns, joint number, XI
and X2 coordinates in inches.
(2) Member Properties
The first two columns indicate the ends of
members. A(3) and A(4) are width and depth of
members. The effective moment of inertia and
torisional rigidity of each member will be
computed by the.input width and depth.
(3) Restraints
Those joints that are restrained are shown.
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4. . OUTPUT DATA
Table II lists the modes and frequencies computed
for the floor slab. Six frequencies and the corresponding
mode shapes are given for-this run. In the mode shape
columns, there are three quantities associated with each
joint. The first of these numbers. is the dimensionless
deflection in X3 direction..The second and third numbers
are rotational modes in Xl and X2 dirctions. All these
quantities are normalized so that the maximun is equal
to unity. The modes corresponding to X3 deflection are
of interest. Figure 2 shows the fundamental mode shape
of the floor slab.
5. DISCUSSION OF RESULTS
The fundamental frequency of the floor slab obtained
from the computer run is 15.578 cps. This floor diaphram
frequency is low and considered critical as far as the
effect to the overall accuracy of the submicron measuring
system is concerned.
Since the computation was based on the assumed
structural dynamic floor model, the result should not
be considered final. Further analysis should be perform-
ed to confirm the data.
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 Approved For Rose 2005/06/23 : CIA-RDP78BO4770AM900010018-2
Figure 2 Fundamental Mode Shape of the 20''x 20' Concrete Floor Slab
Approved For Release 2005/06/23 : CIA-RDP78B04770A002900010018-2
 -TABLE I Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
CONCRETE FLOOR FREE VIRRATION ANALYSIS (TYPE 4 GRID STRUCTURE)
20 FEETX20 FEET BAY,6 MODES REQUIRED,
INPUT DATA
JOINT COORDINATES
JOINT X(1)
.X(2)
X(3)
1 0.
0.
-0 .
`
2 60.00000
0.
-0.
3 120.00000
0.
-0.
4 180.00000
0.
-0.
5 240.00000
0.
-0.
6 0.
60.00000
-0.
6_6
7 ~- . 60.000
60.00000
-0.
8 120.00000
60.00000
-0.
180.00000
60.00000
-0.
10 240.00000
60.00000
-0.
11 0.
120.00000
-0.
12 60.00000
120.00000
-0.
-
13 120."00000
120.00000
-0.
l
i
14- 180.00000
120.0000(Y
-0.
240.00000
15 240.00000
120.00000.
-0.
16 0.
180.00000
-0.
17 60.00000
180.00000
-0.
18 120. 00000.
1 80.00000
-0.
19 1 80. 00000
180.00000
-0.
tr
_____20_
240.00 - 0 - 0 - 0
-- 20-
1.80._00000
-0.
2.1 0.
240.00000
-0.
22 60.00000
240.00000
-0.
23 120.00000
240.00000
24 180.00000
240.00000
-0.
25 240.00000
240.00000
-0.
2.6
0.00000
I
2
-60.00000
-0.
_
_
_____
_.
27
60.0.0000
-120.00000
-0.
28 3 0-0.00000
120-00000
-0.
29 120.00000
300.00000
-0.
MEMBER PROPERTITES
2)
2
0.
-0.
30.00000 32.00000
3
0.
-0.
30.00000 8.00000
0.
-0.
30.00000 8.00000
-0.
30.00000 32.00000
7
0.
-0.
60.00000 8.00000
-0.
60.00000 8.00000
9
0.
-0.
60.00000 8.00000
10
0.
-0.
60.00000 8.00000
11
12
0.
.-0.
60.00000 8.00000
----
12
13___--
0.
-0.
60.00000 --- 8.00000
13
60.00000 8.00000
14
1_5
paved "For-IQelease 2005 0612):Om1A-RDlq7 7tdOA002900010018-2
16
1"7
0.
-0. 60.00000 8.00000
 TABLE I CONTINUE
.. -Approved For Release A--RBP,7.8BO4T76A-0029OOO1 0018-2
17
18
0.
-0.
60.00000
8 . 0 0 0 0 0
18
19
0.
-0.
6 0. 00000
8.00000
19
20
0.
-0.
60. 00000
8.00000---
21
? 2
3 0.00000
2.00000
22
23
0.
-0.
3 0. 00000
8.00000
23
24
0.
-0.
30.00000
8.00000
24
25
0.
-0.
30.00000
__32.00000
1
6
0.
-0.
30. 00000
32.00000
6
11
0.
-0.
3 0. 00 000
8.00000
-0.
3 0. 00 000
8.00000
16
21
0.
-0.
30.00000
32.00000
2
7
0.
-0.
60.00000
8.00000
7
12
-0.
60.00000
8.00000___
12
17
60.00000.
8.00000
-0.
60.00000
8.00000
-0.
60.00000
8.00000
8
13
-0.
60.00000
8.00000
13
18
-0.
60. 00000
8.00000
18
23
0.
-0.
60.00000
8.00000
4
9
0.
-0.
60.00000
8.00000
9
14
0.
-0.
60.00000
8.00000
-0.
60.00000
8.00000
19
24
-0.
60.00000
8.00000
5
10
-0.
3 0. 00000
_
32.00000
10
l5
-0.
30.00000
8.00000
15
20
0.
30.00000
8.00000
20
25
0.
-0.
30.00000
32.00000
3
26
0.
-0.
60.00000
8.00000
11
27
0.
60.00000
8.00000
15
28
0.
-0.
60.00000
8.00000
23
29
0.
-0.
60.00000
8.00000
RESTRAINTS,
1--YES,
O--NO
JOINT
X(1)
X(2)
X(3)
5
1
1
1
21
25
1
1
26
1
1
1
27
1
. 1
1
28
- 29 -
1
1
1
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 TABLE II
? Approved F -r R-eTease-2G65/06T23Tc17ARDP78B04770A002900010018-2
FREQUENCIES (CPS)
15.578 28.702 28.702 37.182 43.583 49.409
.MODE SHAPES
1 0. 0. 0. 0. 0. 0.
0. 0. 0. 0. 0. 0.
0. 0. 0. 0. 0. 0.
0.03941 0.07687 0.11934 0.12956 -0.09119-0.08618
0.00043 0.00031 0.00098 0.00030 -0.00025 0.00032
-0.00111 -0_.00216 -0.00322 -0.003620.00245 0.00245
0.18725 0.62561 0.62561 1.00000 -0.82252 -1.00000
0.00539 _-0.01110 0.01110_-_-0.011.1.2_-0.00404 -0.00041
-0.00000 -0.00347 0.00157 -0.00000 0.00000 -0.00166
0.03941 0.13532 0.09285 0.12956 -0.09119 -0.03125
0.00043 0.00124 0.00056 0.00030 -0.00025 0.00099
.0.00_111-__0.00363 0.00236 0.00'362---0.00245- = 0.00110--_.
0. 0. 0. 0. 0. 0.
0. . 0. 0. 0. 0. 0.
0.03941_ _-0. 073320.07633-..0.12956 -_ -0, 09120 .---0.02811 .
0.00111 -0.00206 0-.-0-02--03- -0.00362. -0.00245 0.00074
-0.00043 0.00028 -0.00082 0.00030 0.00025 -0.00026
0.39555 0.01310 0.72430 0.00000 -0.15353 0.19111
0.00695 -0.00784 0.00451 -0.010:94 _ 0.00273 0.00360
-0.00695 -0.00809 -0.00902 -0.01084 -0.00273 -0.00015
0.68551 1.00000 1.00000_ 0.80594 - 0.04620 ____ 0. 18746
0.00823 -0.00368 -0.00368 -0.01390 0.01725 0.01195
-0.00000 -0.01220 0.00553 -0.00000 0.00000 -0.00475
0.39555 0.99197 0.28076 0.00000 -0.15353 0.68977
0..00695 0, 00916= 0.0031 9 0-.01.034_-0.00273 --0,00508
0.00695 0.00937 0.00844 . 0.01084 0.00273 0.00135
10 0.03941 0. x_3334 -0.01681 -0.12956 -0.09120__0.08542 -
0.00111 0.00357 -0.00052 -0.00362 .-0-.00245 0.00216.
0.00043 0.00123___0_.0.001.4 -0.00030__-0.00025 0.00092
11 0.18725 -0.60931 0.27608 -1.00000 -0.82259 -0.01037
0.00000---0. 00356 -0.00356 0.00.000__0.00000 -0.00213
-0.00539 0.01081 -0.00490 0.01112 0.00404 0.00000
12 0.68551 -0.97394 0,44130 -0.80594 -0.04618 0.00194
0.00000 -0.01253 -0.01253 -0.00000 0.00000 -0.00654
-0.00823 __70.00358 ___ 0.00162__-0._01390___ -0.01725 ___-0.00012
13 1.00000 0.00000 0.00000 0.00000 1.00000 0.00000
0.00000 -0.01966 -0.01936 0.00000 0.00000 -0.01089
-0.00000 -0.01934 0.00876 -0.00000 -0.00000 0.00011
14 0.68551 0.97394 -0.44130 -0.80594 -0.04618 -0.00194
0.00000 -0.01253 -0.01253 0.00000 0.00000 -0.01627
__ _ 0.00162_ 0,01390 _ 0.01725 -0.00012
0.00823 -0.0035R--o.
15 0.18725 0.60931 -0.27608 -1.00000 -0.82259 0.01037
0.00000 -0.00356 -0.00356-0.00000 0.00000 -0.00553
0.00539 0.01081 -0.00490 -0.01112 -0.00404 0.00000
16 0.03941 -0.13334--0.016,81 -__-0.12956 -0.09119 -0.02932
-0.00111 .0.00357 -0.00052 0.00362 0.00245 0.00077
_-0.00043 --0.-_041 23 0.00014 0.000.30--_0.00025. 0.00024
17 0.39555 -0.99197 -0.28076 -0.00000 -0.15346 -0.18198
-0.00695-0.00916 -0.00319 0.01084 -0.00273 0.00379
-0.00695 0.00937 0.00844 0.01084 -0.00273 0.00006
18 _ -0.68 55ip reqq eeasle2 95196/23 :(QIA4W--+78B047T + 90 9QQ' 74 6
-0.00823 -0.00368 -0.00368 0.01390 -0.01726 0.01195
 .,TABLE II Capp oveEd For Release 200/06/23: CIA-RDP78f477. A002900010018-2
-0.00000
-0. 01220
0.00553-0,00000 -0.00000
0.00498
19
0.39555
-0e 01310
-0.72430 -0?00000 -0?15346
-0.69890
-0.00695
-0.00784_
0.00451 0.01084 -0.00273
0.00509
0.00695
-0.00809
-0.00902 0.01084 0.00273
-0.00144
20
0.03941
0.07332
-0.07683 -0.12956 -0.09119
-0.08420
-0?00111
-0. 00206
0.00203 0.00362 0.00245
0.00212
0.00043
0.00028
-0.00082 -0.00030 -0.00025
-0.00094
21
0..
0.
0. 0. 0.
0.
0.
_0. 0. 0.
0.
0.
0. 0.
22
0.03941
-0?13532-0.09285
__ 0.12955_ -0.09120
0.08735
-0.00043
0.00124
0.00056
-0.00030 0.00025
0.00030
23
-0e 00111
0.18725
0.00363
-0.62561
0.00256
-0.62561
-0.00362 0.00245
1.010000 -0?8226.5
-0.00248 1.00000
-0.G0539
0.03110
0.01110-0.01112 0.00404
-0.00041
-0.00000
-0.003470.00157
-0.00000 -0.00000
0.00174
24
0.03941
-0.076,97 -0.11934.
0.12956 -..-0.09120
0.03008
-0.00043
0.00031 0.00098
-0.00030 0.00025
0.00100
0.00111
-0-00216 -0.00322
0.-00362-_- -0.0024.5__
-0.00107
0.
0. 0.
0. 0.
0.
?
0 "--- 0.
0, -0 -
-0. - -
0. 0.
0. 0.
0.
0.
0. 0.
0.
0. 0.
0. 0.
0.
0.
0?. - - ~?
0.
27
0.
0. 0.
0. 0.
0.
0.
0. 0.
0. 0.
0.
0 .
0.
28
0.
0. 0.
0
0
0. 0.
0. 0.
0.
0.
0. 0._-
_0.
0.
29
0.
0. 0.
0. 0.
0.
0.
0.
0.
0.
0. 0.
0.
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 TAT
TAT
Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
August 6, 1965
Dear Bob,
For your information and file, en
copy of a letter to Lou advising him that
has given up consulting and has taken a position in
San Diego. Peter is now in process of relin uishin
his financial interest in
Regards,
Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2
STAT
STAT
STAT
 Approved For Release 2005/06/23 : CIA-RDP78B04770A002900010018-2
August 6, 1965
ar Lou,
Enclo ed is form 1841 advising you that
has resigned from the Company. He
has given UP c
ositio withl
I La preset vest ffise of his
nsneial interest in
Very
ly yours,
STAT
STA
STAT
Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010018-2