Vibration measurements at Eldorado Mining and Refining Company, Ottawa

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Technical Note (National Research Council of Canada. Division of Building Research), 1964-01-01

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Vibration measurements at Eldorado Mining and Refining Company,

Ottawa

Crawford, R.

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DIVISION OF BUILDING RESEARCH

No.

NATIONAL RESEARCH COUNCIL OF CANADA

412

NOTE

ｾ

'f

E

_C

1HIN ][ CAlL

PREPARED BY

R. Crawford CHECKED BY TDN APPROVEO BY NBH

January 1964

PREPARED FOR

R. C. Hawtrey,

Eldorado Mining and Refining Company, Tunney's Pasture, Ottawa.

SUBJECT

VIBRATION MEASUREMENTS AT ELDORADO MINING AND REFINING COMPANY. OTTAWA

Background vibrations at different sites in the laboratories and offices of the Eldorado Mining and Refining Company were measured under several environmental conditions. The object was to locate the position that was least affected by background vibration for the installation anq efficient operation of an X-ray spectograph.

Procedure

Background vibrations were measured using transducers sensi-tive to particle velocity with the final output being displayed as permanent vibration records, copies of which are enclosed as part of this report. The three components of velocity, the vertical ｡ｭｾ two horizontal were generally observed. The longitudinal component was defined as being in the east-west direction and the transverse in the north-south direction.

The amplitudes were observed at locations on the ground floor and on the fir st floor, with no machinery running in the machine shops and then with a lathe and a drill operating in the shops.

The measurements from the twenty-six vibration records are listed in Table I as peak velocity amplitudes at each location.

Results

Most of the ener gy is contained in the vertical component of velocity. The amplitudes of this component observed in the upstairs

2

-locations are 4 to 5 times as high as those in the downstairs -locations. Toward the west end of the building, in the mezzanine, the amplitudes are approximately 9 to 10 times higher than those encountered downstairs. The operation of the machinery increases the amplitudes by a factor of less than 2.

An important feature seen from a glance at the vibration records is that relatively higher frequencies occur in the downstairs locations as compared to the frequencies involved upstairs. Compare the waveshapes as shown on Records 1, 10 and 19 as an example. The lower frequencies upstairs are probably due to the vibration of the panel sections between beams in the first floor. The importance of this arises when displacement is considered. The relative difference in displacement vibration level between the ground floor and the first floor will be increased in proportion to the ratio of the higher to the lower frequency. In view of this the use of the upstairs location is not recommended.

No information is available on acceptable vibration levels for an instrument of this type. Nevertheless, previous work concerning back-ground vibrations associated with an electron microscope has shown that a peak velocity amplitude of 1. 0 to 2. 0 x 10-3 in. / sec did not adver sely affect the operation of the instrument. This might be taken as a tentative criterion. On this basis it is clear that the best location will be downstairs. The lowest amplitudes were observed in the downstairs office and in the Sample Reducing Room.

TABLE I

VIBRATION MEASUREMENTS AT ELDORADO MINING AND REFINING COMPANY

Peak Velocity Amplitude

Transducer Location in.• /sec x 10-3 Remarks

Vertical Longitudinal Transverse

Downstair s Office 0.85 0.48 Machinery off

"

"

0.91 0.72 Machinery on

Sample Preparation Room 0.48 0.29 Machinery off

11

"

_"

1.9 1.4 0.86 Machinery on

Mr. Hawtrey's Office 1. 2 0.30 0.34 Machinery off

"

"

II _1.9

0.86 1.6 Machinery on

Sample Reducing Room 1.3 0.. 72 0.80 Machinery on

Green Salt Room _{9.6 3.6 2. 4 Machinery on}

High Purity Lab. _{10.• 8 2. 0 1•.9 Machinery on}

No. 2 Mezzanine 16.8 5.0 3.6 Machinery on

Upstair s Office _{4.8 1.0 1. 2 Machinery off}

"

"

4.6 1.4 1. 5 Machinery on

Thermal Balance Room _{5.0 1.0 1.5 Machinery off}

"

"

"

4.9 1.9 Machinery on,

fan off

"

II II _5.4

1.8 Machinery on,

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