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Learning Outcome
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Learning Outcome
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Assessment Criteria
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In this assessment you will have the
opportunity to present evidence that shows you are able to:
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Task no.
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Evidence
(Page no)
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LO4
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Be able to determine the effects
of
sound and vibration
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4.1
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discuss the transmission and
propagation of sound
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1a
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4.2
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calculate sound power from
performance data
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1b
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4.3
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determine reverberation times
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1c
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4.4
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determine the performance
characteristics of anti-vibration mountings
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1d
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Scenario. The facilities manager of your company
has asked you to carry out an investigation into a plant room which houses an
air conditioning fan. It is 4 m x 3 m x 2.5 m in plan. It consists of walls
which are made of brick and a concrete floor. It has a steel deck ceiling
with an insulation layer of 50 mm glass fibre. Ignore the effects of any
equipment and the single entrance to the room. The air-conditioning fan is
placed centrally. Using the data provided, you are required to carry out the
following tasks.
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Task 1a. (LO4: 4.1
) Discuss the transmission and
propagation of sound
Discuss
the scientific principles involved in the transmission and propagation of
sound.
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Task 1b. (LO4: 4.2) Calculate sound power from
performance data
You
have been tasked to carry out an investigation to determine the sound power
level on the A scale of the air-conditioning centrifugal fan located in the
plant room mentioned above. At 1 m from the fan, the sound pressure level is
83 Db. Take the room absorption constant to be m2 at kHz, and the directionality factor as 2.
This will satisfy M1.2.
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Task 1c. (LO4: 4.3) Determine reverberation times
Using the absorption coefficients of the
materials mentioned. Determine the reverberation time of the plant room. You
will need to choose a frequency from the list and use the relevant absorption
coefficients.
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Task 1d. (LO4: 4.4) Determine the performance characteristics of
anti-vibration mountings.
Using
the plant room air-conditioning fan as an example, determine the performance
characteristics of anti-vibration mountings. You should offer an optimum
solution to a scenario where the fan is producing unwanted vibrations. This
will provide evidence for D3.5.
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Evidence checklist
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Summary of evidence required by student
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Evidence presented
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Task
1a
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A
discussion document on the relevant scientific principles including suitable
graphics.
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1b
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The
sound power level correctly calculated from the data provided.
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1c
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The
reverberation time correctly calculated from the data provided.
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1d
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Evidence
of the performance characteristics and a suitable solution to the problem
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