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Vibration Scenario B-1

07 Nov 2003

B-

Actual Scenario

The following Scenario was based on an actual event. The user

was preparing for major construction work at the site where

the equipment was located and was very concerned about the

effects the resultant dust, dirt, and vibration could have on the

current equipment.

Vibration Scenario

Concerns: The vibration concern is “what if” if an above the

floor steel I-bean bracing is placed on top of the slab in the

adjacent bay and is accidentally dropped? The concern is not

for say a height of 5 feet, but the last inch or so when it is being

released. The distance can vary from between 15’ to 60’ away.

However, the actual placing of steel can be scheduled.

ADIC Questions: With regard to the “what if” vibration

scenario:

• Is this above-floor I-beam bracing being installed on top of

the floor you reinforced with I-beams prior to installing

the AML/2?

• How long is the steel I-beam? (To get an idea of point

pressure and floor response.)

• How heavy is the steel I-beam?

• How much “give” is there in the floor that this I-beam

might land on?

• What extent (amplitude and duration) of vibration do you

anticipate? Enough to vibrate a coffee cup off a desk? Will

you be using jackhammers?

If the supporting floor is supported such that you’re not

expecting significant horizontal or vertical displacement (and

a consequent “ringing wave” action back to the slab’s

equilibrium point), then any vibration resulting from an I-

beam drop would be low amplitude short duration and of no

concern.

The principal concern is whether the library and/or the drives

will be operating during the “what if” scenario. The vibration

is the major concern because high amplitude vibration while

the library is moving would mainly affect the robots and the

tape drives. Robot elements could become bent, resulting in

extended repairs and drives could come out of alignment,

resulting in extensive reteaching resulting in extended

downtime.

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