2. Vibrations in Data Centers
Vibrations in Data Centers can be produced by nearby construction works,
heavy traffic, railways or even the own cooling units inside or next the room
and other equipment in the same Data Center introducing vibration noise in the
room.
Additionally, the
Seismic Hazard,Seismic Hazard,
as can seen
in the following
World Seismicity
Map.
3. Effects of vibration in disk drives
The following data indicate that peak accelerations greater than 0.5 g
(1 g = 10 m/s2) in the servers would be subject to forces that could cause
permanent damage and loss of data readable.
The forces generated by low frequency seismic waves are generally
more destructive than higher frequency vibrations because of their
longer periods generated with larger amplitudes.
4. Effects of vibration in disk drives
According to various manufacturers, Disk Drives Units have a limit even lower
than the servers, see for example the values of HITACHI 9900 Disk Unit
(formerly SUN 9900) indicating its limit in 0.49 m/s2, considering that in normal
operation has a value of 0.10 m/s2.
5. Effects of vibration in disk drives
Latency study in
SUN Disk Drives
Units, the effect
produced after
suffering vibrations
within the range
accepted by theaccepted by the
manufacturer, which is
results in loss of
time while discs are
looking for position to
read or write,
some studies report
up lost hours
in 1-10-50 TB copies.
6. System's natural frequency and vibration isolation solutions
The vibrations cause the system to oscillate at its own vibrational
frequency (each oscillation time or period corresponding to the inverse of
the frequency itself). If the period (or frequency) of the structure matches
that of the building or land where supports, is the phenomenon called
resonance in which the effects of vibrations are increasing, increasingly
expanding oscillations are becoming larger due to the accumulation of
kinetic energy in the interior of the oscillating mass.kinetic energy in the interior of the oscillating mass.
Designing a proper anti-vibration system is to determine the minimum and
maximum weight of the system to know the mass design elements absorb
these vibrations taking into account the resonance frequency of these same
elements.
Depending on the characteristics of the room can choose protection
systems such as individual springs (1), metallic frames (2) or concrete slabs
(3), either vibration or seismic ones.
7. 1. Individual Springs
One of the proposed solutions are
spring-based systems with or without
sub-frame rated for the Maximum
Weight of the rack, representing this
a problem of effectiveness in racks
with half or less density.
8. 1. Individual Springs
The springs installed have an Own
Frequency of 4.5 Hz to full load.
4 individual springs per rack
1.98 KN=202 kg, total over 800 Kg
9. 1. Individual Springs
The graph shows the effect of a spring protection system installed individually in
each rack. In red the vibrations observed on the ground (in German boden)
produced by near construction works and in blue the signal filtered in the racks,
with a value of 0.10 m/s2.
10. 2. Anti-vibrations Metallic Frame
The Anti Vibrations Metallic Frame is a low frequency isolation resonance
with container elements and integrated isolators in their own frame, with
a significant degree of vibration isolation. This type of suspension is best
suited for a case like this where we do not have a real spectrum of vibrations
to be produced, and a frame of this type have the ability to obtain a system
with a low resonance frequency or natural frequency, while the weight is
better distributed over the whole system frame, allowing racks have somebetter distributed over the whole system frame, allowing racks have some
half load without affecting efficacy.
11. 2. Anti-vibrations Metallic Frame
It maintains a low resonance frequency, having a significant variation
in the weight of equipment supported on anti-vibration frame, for
example for a Data Center whose load will be variable over time, with an
estimated total load of the slab 10 Metric Tons (9 T the slab and 1 T IT
equipment), it appears that we are about 4 Hz resonance frequency and this
is so even if we have a significant change in weight.
12. 2. Anti-vibrations Metallic Frame: Technical Features
• Ability to maintain overall stability while obtaining low resonance frequencies,
which provides high performance anti-vibration, thanks to the great stability
obtained by notably reducing the center of gravity of the system.
• Also increases the stability
of the whole system
placing supports more
separated.separated.
• Fast leveling system
integrated in the frame.
• Different thicknesses
of frames.
• Maintaining one
low internal frequency
even with large load
variations.
13. 2. Anti-vibrations Metallic Frame
• Possibility to vary the spacing between the Frame and the floor between 10
mm. and 50 mm.
• Natural frequency (Hz)
• Metallic Frame with
integrated silent blocks.
• Metal container with
high resistance system,high resistance system,
safe and quick access.
• Containers with system
registrable for replacement
the silent blocks.
• Double set silent blocks
for high and low frequencies.
14. 2. Anti-vibrations Metallic Frame
Anti-vibration protection system
by common frame for all 10 racks
of the company, along with its
graphical function efficiency
frequency.
15. 3. Description Floating Slab System
The high-performance floating slab is
a floor isolation system with low
resonance frequency and
integrated isolators in container
elements inside the concrete slab,
with a high degree of vibration
isolation. This type of suspension isisolation. This type of suspension is
best suited for Data Center
environment in which we do not have
a real spectrum of vibrations that
will occur in an earthquake or possible
nearby construction works, and a slab
of this type have the ability to obtain a
system with a low frequency
resonance or natural frequency.
16. 3. Floating Slabs: Other Applications
Anti-vibration protection systems consist of Floating Slabs have been widely
used by various industries for vibration absorption and attenuation
impacts: radio studios, TV studios, recording studios, industrial washing
machines, refrigeration equipment, electrical transformers with oil tank
located between the slab and the transformer, boilers, elevators, gyms,
bowling alleys, dance halls, cold rooms, machine tools, precision balances
dynamic UPS machinery, printing presses, newspaper presses, and so on.dynamic UPS machinery, printing presses, newspaper presses, and so on.
17. 3. Floating Slabs: Main Specifications
• Concrete slab with integrated silent blocks in the slab itself.
• Metal container with high strength system, safe and fast in binding to mesh.
• Containers with recordable system for replacement of silent blocks.
• Double set of silent blocks for high and low frequencies.
• Levelling system integrated with the whole slab.
18. 3. Floating Slabs: Technical Specifications
• Ability to maintain overall stability while obtaining low resonance frequencies,
which provides high performance vibration, thanks to the great stability
obtained by notably reducing the center of gravity of the whole system.
• Natural frequency (Hz)
19. 3. Floating Slabs: Technical Specifications
• The silent blocks can be replaced by others with different charge or
different natural frequency.
• Fast integrated leveling system of the whole slab.
• Different thicknesses of slab
• Standard thicknesses of slab H1 = 128 mm. and H1 = 148 mm. Other
thicknesses can be supplied. Standard separation S = (from 1-5 mm). For
special cases for further expansion.special cases for further expansion.
• Natural frequency is maintained low even with large load variations
• Possibility to vary the gap between the floor and the slab and from 10
mm. to 50 mm.
• Can be built while maintaining a certain slope.
20. 3. Floating Slab
Floating anti- vibration slab was installed to protect from vibrations
occurred in the Data center, communications equipment and other electronic
equipment sensitive to vibration that occurred as a result of the construction
works being carried next the room at the XXX Hospital.
The project was focused on protection of jackhammers. The jackhammers
work about 900 beats per minute, in this case as a result of this work, if wework about 900 beats per minute, in this case as a result of this work, if we
conducted vibration taking action, we would find that we would appear on the
chart several peaks, which we would be saying we have in certain
frequencies a vibrations that marks the peak high acceleration.
As a result of the 900 beats, the maximum acceleration would have a 15 Hz
and harmonics of these: 30 Hz, 45 Hz, etc.
21. 3. Floating Slab
On the other hand as a result
of impacts and the time rock
breakage we also produced
peaks at acceleration in a
frequency certain, this will
depend on rock type and
soil type where vibrationssoil type where vibrations
are propagated, in this case
we had some peaks between
30 and 45 Hz.
In addition, we must take into
account the Compaction
Process, which produces
vibrations at frequencies 25 or
35 Hz, in depending on the
manufacturer of the Compaction
Machine.
22. Example of Earthquake Protection
ITEM 1: Slab anti-vibration, with earthquakes seismic attenuation to medium-
low level.
TECHNICAL DATA
Dimensions slab (m) 10x15
Slab area (m2) 150
EQUIPMENT AND PEOPLE Weight (kg) maximum load 60.000
EQUIPMENT AND PEOPLE Weight (kg) minimum load 18.000
Slab Weight (Kg) 54.000Slab Weight (Kg) 54.000
Total weight suspended (kg) maximum load 114.000
Total weight suspended (kg) minimum load 72.000
Over-use load (kg) 41.000
Maximum Total Load (kg) 155.000
Number of silent blocks per slab 155
Rigidity Coefficient of the Slab KN / m 76.462
Rigidity Coeffiecient of the Slab Kg / mm. 7.646
Resonance Factor slab (r.p.m.) at maximum load 245
Resonance Factor slab (Hz) at maximum load 4,08
Resonance Factor slab (r.p.m.) at minimum load 308
Resonance Factor slab (Hz) at minimum load 5,14
% Isolation for 25 Hz (+) 99%
% Isolation for 50 Hz (+) 99%
% Isolation for 100 Hz (+) 99%
Slab thickness (mm) 150
23. Example of Earthquake Protection
- In addition to the basic anti-vibration system slab, will be placed shock
absorbers stainless steel wire with double slip soles, non-slip sole gives
high isolation to the horizontal movements, in the case of slab fell few cm as
these pads will be separated from the slab .
-Bindings of the shock absorbers to the containers to prevent a possible
shift in case of earthquakes of medium intensity.shift in case of earthquakes of medium intensity.
- Placement on the bottom of each shock absorber of spring container,
attached to the spring and with anti-slip sole, but also a steel machined base
is added to distribute loads and provide the joint between the two. This
got protection against medium intensity earthquakes.
We must stress that raised floor should be screwed to the slab, not just
glued, to allow both feet and raised floor tiles move horizontally with the
slab and avoid raised floor collapse.
24. Example of Earthquake Protection
ITEM 2 (OPTIONAL): To achieve a higher degree of protection should perform a
physical union of all racks with steel springs interposed stainless steel wire
and replace leveling legs for machine feet dampers and stainless steel wire
non-slip soles.
In this way is achieved
greater mass of the systemgreater mass of the system
and prevent them from tipping
to large horizontal forces.
Force is equal to mass
by acceleration, by joining
the mass, we decrease the
accelerations and thus the
movement of equipment
in the Data Center, in
addition braking by
non-slip feet.
25. Example of Earthquake Protection
ITEM 3 (OPTIONAL): anti-shock system to absorb the slab impact energy
horizontally in case of a earthquake in the 2 horizontal axes X and Y.
The greatest degree of protection to include a concrete wall of 200mm and
the height from the slab to the raised floor, on which are placed horizontally
elastic elements both on the side of the slab and in the raised floor tiles that
move give up their energy to these horizontal elastic.move give up their energy to these horizontal elastic.
The wall will be in charge of making the opposing force to the slab and
withstand the shock. The perimeter space of the room will be protected with
rock wool.
ITEM 4 (OPTIONAL): Increase the seismic mass by increasing the slab
thickness of 150 mm to 200 mm, to improve performance and isolation,
further decreasing the level of acceleration.
28. For any comment or doubt:
THANKS
For any comment or doubt:
Emilio Sapina
CEO
SECURE TECHNICAL ROOMS
Tel: +34-657663442
info@securetechnicalrooms.com
www.securetechnicalrooms.com
