DEPARTMENT OF MECHANICAL AND PRODUCTION ENGINEERING
AHSANULLAH UNIVARSITY OF SCIENCE AND TECHNOLOGY
LAB REPORT
COURSE NO : IPE 3202
COURSE NAME : ERGONOMICS AND PRODUCTIVITY
ENGINEERING SESSIONAL
EXPERIMENT NO. : 03
EXPERIMENT NAME: DETERMINATION OF SOUND LEVEL
DIFFERENT WORKPLACES
DATE OF SUBMISSION: 12.01.2023 GROUP: B-1
SUBMITTED BY-
Anik Kumar Mandal (190207127)
Khandakar Mafijul Islam (190207128)
Samian Hossain (190207130)
Syeda Rifah Shanjid (190207131)
Ishtiak Ahmed Safin (190207132)
Dewan Tanvir Ahmed Emon (190107104)
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Objective:
In this experiment, we have to construct a noise contour map of a sound emitting source.
Critically analyze the findings and comment for improvements. Also we have to give an effective
comment for improvement of the sound-emitting source
Objective as assigned (Grinding) machine wise:
To construct a noise contour map of a sound-emitting source.
To find out specific effects of the noise.
To find out the range of sound level for grinding machine.
To give an effective comment for improvement of the sound-emitting source.
Apparatus:
Measuring Tape
Sound Level Meter
1. Windscree
9. DC, AC Output Jack
8. Microphone
2. Display
6. Max Hold button
3. Level Range Select Button
9. DC, AC Output Jack
4. Time Weighting Select Button
7. Data Hold Button
5. Power and Function Switch
10. Calibration potentiometer
Figure 3.1: Sound Level Meter
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Experimental setup:
Figure 3.2: Experimental setup of Grinding Machine.
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Working procedure:
1. After pressing the power button, the sound level meter started to showa reading
of that level. Away from the body, the meter was held
2. The meter's auto-ranging setting was used. When the volume rangeselect
button was pressed, the Hi (65-130dB) range was chosen.
3. Then we divided this machine’s view into three parts to take the values from the
machine.
4. Then we took the values from the 1st zone and after that from 2nd zone as going
beside the machine. We rounded beside the machine.
5. After tracing the points, we created a contour map by plotting the values.
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Noise Control Diagram:
1
117.5 cm with 64.2 dB 205.5 cm with 62.2 dB
2 132 cm with 65.6 dB 183.5 cm with 61.6 dB
3
SOURCE 172.5 cm with 65.7 dB
184.5 cm with 62.2 dB
4
154.5 cm with 64.4 dB
6 5 192 cm with 62.1 dB
151 cm with 65.2 dB 154 cm with 65.1 dB
5.7 dB
192.5 cm with 64.3 dB 196 cm with 66.4 dB
5.7 dB
Figure 3.3: Noise Control Map for the Grinding Machine (AUST Machine Shop)
Zone -1 (Light Sound level-1 Zone -2 (Light Sound level-2
Green
5.7 dB Dash Box) Orange Dash Box)
SOURCE 117.5 cm 64.2 dB 205.5 cm 62.2 dB
132 cm 65.6 dB 183.5 cm 61.6 dB
(Grinding 172.5 cm 65.7 dB 184.5 cm 62.2 dB
Machine)
154.5 cm 64.4 dB 192.5 cm 62.1 dB
154 cm 65.1 dB 196 cm 66.4 dB
151 cm 65.2 dB 192.5 cm 64.3 dB
Figure 3.4: Table of Noise Control Map indication of zone for the Grinding Machine
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Discussion:
The experiment deals with the determination of sound level meter and create a noise contour
map of that workstation. This noise contour map's goal is to make workers aware of the
workstation's noise level so they can take the appropriate safety precautions.
In this experiment, our assigned workspace was the Grinding Machine of AUST machine shop
lab. The frequency of sound was measured for various locations surrounding the machine using
the sound level meter. At work, volume is really important. Workers will be able to determine
where to wear PPE when working in particular regions by observing the sound intensity.
Additionally, a sound meter can be used to gauge the sound's level. In research on noise
pollution, sound level meters are frequently used to measure various types of noise, including
noise from industrial, environmental, mining, and airplane sources. In this experiment, 3-(three)
places close to a source (Grinding Machine) were chosen, and a sound level meter was used to
track the sound that the source produced as it went through each position. This experiment
basically entails measuring the sound pressure levels in various workspaces. The meter is
adjusted to the necessary settings as near the engine of the machine, measuring the sound level.
The sound level range is set to HIGH (60-130 dB). Since the source is fixed, some noise is
moderately fluctuating. The function was chosen because the sound level frequencies are within
the normal range and are weighted for general sound measurements. A noise contour map is
generated after the noise level of group B1-(04) is determined. The noise contour map shows that
most locations have noise levels above 62 dB. Maximum noise level was recorded as 66.4 dB.
From this experiment we could say that there was no noise because the sound pressure level did
not exceed 85.00 dB.
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