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Dec 6, 2023
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MECH 313 Data and Acquisitions Laboratory Lab 9 Construct an Alarm System Using Motion Sensor
Prof. Yuetong Lin
Nathan Hernandez 10-7-2023
Hernandez 1 Purpose This purpose of this week’s lab was to construct a strain gauge configuration using a Wheatstone bridge based on the provided example from LabView. In our lab we covered how a myDAQ can be used to read the measurements from a strain gauge, created the bridge, and verified our results with LabView. The lab results were recorded and can be found at https://youtu.be/OePvCCgAamg
. Objectives As mentioned, our objective for this week’s lab was to construct a Wheatstone bridge configuration and use it to read the measurement of a strain gauge by connecting it to myDAQ and LabView. We were also asked to add the additional functionality of a low-pass filter for signal noise, and having the results recorded by using the Write To Spreadsheet express VI. Equipment and Supplies For this lab the equipment we used were three 1k Ohm resistors, a strain gauge, a breadboard, myDAQ, and assorted jumper wires. The voltage signals were processed and read by LabView.
Theory
Strain gauges output very small changes in voltage or resistance when a heavy load is applied to them which makes capturing the measurements changes difficult. This is why they are usually measured using a Wheatstone bridge. The Wheatstone bridge applies an excitation voltage across the bridge and based on the output voltage being returned the resistance change of the strain gauge can be read. Assuming we know the values of the resistors the following equation can be used to find the resistance of 𝑅
4
which in our case would be the resistance across the strain gauge:
𝑉
𝑂
= (
𝑅
3
𝑅
3
+ 𝑅
4
−
𝑅
2
𝑅
1
+ 𝑅
2
)𝑉
𝐸𝑋
Because we choose 1k Ohm resistors for our Wheatstone bridge we can simplify the equation to the following:
𝑅
3
=
𝑉
𝑂
𝑉
𝐸𝑋
Hernandez 2 The following diagram will also be used for our setup as a guide on how to connect to myDAQ.
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QUESTION 2
Calculate the length of the resistor of a circular wire used in a heater element connected to a
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is made of aluminium and it has a uniform cross-sectional area with a diameter of 0,00016
inches.
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%3D
[S]
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You are a biomedical engineer working for a small orthopaedic firm that fabricates rectangular shaped fracture
fixation plates from titanium alloy (model = "Ti Fix-It") materials. A recent clinical report documents some problems with the plates
implanted into fractured limbs. Specifically, some plates have become permanently bent while patients are in rehab and doing partial
weight bearing activities.
Your boss asks you to review the technical report that was generated by the previous test engineer (whose job you now have!) and used to
verify the design. The brief report states the following... "Ti Fix-It plates were manufactured from Ti-6Al-4V (grade 5) and machined into
solid 150 mm long beams with a 4 mm thick and 15 mm wide cross section. Each Ti Fix-It plate was loaded in equilibrium in a 4-point bending
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160 kJ/kg*K
Device
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