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Don Bosco Technical College Mandaluyong City

This document summarizes an experiment conducted to determine the damping constant of a pneumatic air cylinder. The experiment involved dropping weighted plastic bags from various heights using different biscuit packaging weights and recording the time taken to reach maximum displacement using a high speed camera. Based on the recorded data, the damping constant of the cylinder was calculated to be 19.03 kg/s. However, the experiment was limited by the lack of millisecond timing support on the high speed camera. A camera with millisecond timing was recommended to improve the accuracy of measurements.

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69 views3 pages

Don Bosco Technical College Mandaluyong City

This document summarizes an experiment conducted to determine the damping constant of a pneumatic air cylinder. The experiment involved dropping weighted plastic bags from various heights using different biscuit packaging weights and recording the time taken to reach maximum displacement using a high speed camera. Based on the recorded data, the damping constant of the cylinder was calculated to be 19.03 kg/s. However, the experiment was limited by the lack of millisecond timing support on the high speed camera. A camera with millisecond timing was recommended to improve the accuracy of measurements.

Uploaded by

Ayugu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Don Bosco Technical College

Mandaluyong city

Experiment 2
Determination of Damping Constant
Vibration Engineering

Juzsper Avery M. Gimeno

Submitted to:
Engr. Paul Catalan

5/7/18
Background

Springs alongside dampers have played a crucial role in deal with absorbing vibration in
systems. They mitigate the effects of increased vibrations in these said systems.

Objective

Determine the determine the damping constant of a damper of choice.

Theoretical framework

COMPUTATIONS

F = cv
v = x/t
F = W = mg

Materials

1 Tape Measure
1 10 x 50mm Double Acting Mini Pneumatic Air Cylinder CDJ2B10-50 - Intl
1 Plastic Bag
1 High speed camera (240 fps)
10 18.5g Biscuits within packaging

Set Up

The ends of a plastic bag is placed between the two nuts at the lower end of the air cylinder, the
nuts are twisted together to fasten the plastic bag. This allows damping to be measured by
mass and gravity.

Procedure

After the setting up, the biscuits are added into the plastic bag starting from 6 packs of biscuits
up to 10 biscuits in increments of 1 for every testing. The cylinder is held up without blocking
either of the holes that would strengthen the damping effects of the cylinder. Once ready for
recording, the weight is dropped. The time taken for the weight to reach its maximum
displacement is recorded with a high speed camera at 240 fps. The same is done for each
weight used.
Data

Recorded Data

Due to the lack of milisecond support on the high speed camera, the times are based on second
/ 4 basis based on the second display on the camera. With this, we can use the average
function to approximate the damping constant of the cylinder which is 19.03 kg/s.

With the camera limitations, the second test yielded the same time results (rounding off taken
into consideration) for the weights used.

Conclusion

By this data, we can conclude that the damping constant is 19.03 kg/s

Recommendation

- It is necessary to have a more accurate measurement for time ie a better high speed
camera preferrably one that displays time in miliseconds.

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