digital measurement. For spring B: 0.08 mm and 0.1 mm and in
spring C: 0.11 mm and 0.1 mm.
Figure 11. Hysteresis of springs
4. Advantages
and Disadvantages
From the description of the experimental results can be seen
some advantages and disadvantages of this digital measuring devices.
The advantage of this device lies in:
1. The ease of operation
because it uses a digital device
connected to
electronic sensors. 2.
Mechanical system on this device makes it easy to
replace the spring in an easy way
with dimensions
corresponding spring. 3.
Replacement springs is possible because the set
point value
can be
determined before
the measurement process.
In addition, this device still has some things that need to be
improved: 1.
The mechanism
of displacement
measurement system is not using parts
with high precision, which makes manual measurement
accuracy is very limited.
2. The springs used in these
experiments should
have appropriate dimensions on
the measuring
device, especially on the size of the
spring that
should be
inserted into the sliding cylinder that makes the
movement smooth.
3. Weight
measurement accuracy using a load cell
sensor is quite good but the value shown is volatile, as
well as height values that displayed.
The amount of deviation distance measurement depends
on the type of spring used. Springs used in this experiment
has a constant value about 6, 8, and
16. The
accuracy of
measurement by using a spring with the highest constant is
better than the lower constant springs.
4. CONCLUSIONS
Based on final project result in design and implementation of
measurement device of narrow displacement, the author can take
these following conclusions:
1. This research is using a
mechanism where the spring length is changing caused by
compressive force. The force can be sensed and measured
digitally by Arduino base system.
2. Spring that used as a
digitally measuring medium can give a linear changing.
Spring that
used have
dimension in length 12 cm, diameter
14 mm.
This research using three types of
wire diameter, 0.7 mm, 0.8 mm, and 1 mm.
3. Before the measurement
process, determine the set point required to obtain a
constant value of spring used. This value is obtained
by noting the amount of load that makes changes to a
distance of 10 mm. This method is applied so that the
device can test several types of springs easily.
4. Accuracy is obtained by
calculating the difference between measurements taken
manually and with digital measurement. Accuracy of
the spring A is 0.28 mm, the spring B: 0:22 mm, spring C:
0:06 mm. This indicates that the spring with a wire
diameter of 1 mm is more accurate than the spring with
a wire diameter of 0.7 mm and 0.8 mm.
5. Hysteresis test is done by
comparing two values with the
same loading
measurements, taken when the load is placed on the base
in stages and when the load is reduced by one. In the
spring testing a hysteresis can be observed are 0.29 mm
in manual measurement and 0:15
mm in
digital measurement. For spring B:
0:08 mm and 0.1 mm and in spring C: 0.11 mm and 0.1
mm.
5. BIBLIOGRAPHY
Aruino Uno https:www.arduino.ccenGuideI
ntroduction Arduino Uno
https:www.arduino.ccenMainS oftware
Mielke, A.; Roubícek, T. 2003. A Rate-Independent Model
for Inelastic
Behavior of
Shape-Memory Alloys.
Multiscale Model.
Simul.
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Blackwell Scientific
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on-line corrected
version: http:godbook.iu
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compiled by A. Jenkins.
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Standard Practice for Use of the Terms
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