A remotely controlled data acquisition system using LabVIEW

A remotely controlled data acquisition system using LabVIEW

http://kirkgomes.com/cms/remotely-controlled-data-acquisition-system-using-labview

this project was a group effort (Honghao Tan, Sunil Patil and Kirk Gomes) and involved transforming an experiment performed by undergraduates enrolled in the Mechanics and Vibration class so that it could be performed remotely from any computer in the world equipped with an Internet connection and a browser (and proper login credentials). When done in the conventional way, this experiment is not really hard to perform, however, automating everything so that it could be done remotely via a browser proved to be a pretty difficult task especially since none of us had worked with LabVIEW before. These were our objectives :

• To experimentally determine the modulus of elasticity and Poisson ratio for the material used in the pressure vessel.

• To verify the validity of the thin wall pressure vessel formulae for stress.

• To demonstrate how principal stresses are obtained from resistance type strain gage rosettes.

• To compare theoretical, experimental and principal stresses.

• To automate the experiment with a feedback control.

• Data acquisition and analysis using LabVIEW.

• To make this experiment operational from any computer with an internet connection and a web browser.

The following equipment was used in this experiment :

• Pressure vessel test bed complete with a Bourdon type pressure gauge, 6 mounted strain gages and a manual pump

• 24 V, 2.6 A DC motor, quantity - 2

• 0-20 V variable DC power supply

• Relays with 3-32 V DC input, quantity - 8

• 0-1500 psi pressure transducer (Omega Engineering model PX4100-1.5KGV)

• 50 terminal connector block

• SCXI-1349 adapter, SCXI-1000 chassis, SCXI-1122 module and SCXI-1322 terminal connector block

• PC with installed PCI-MIO-16XE-50 DAQ card and NI LabVIEW software

The schematic diagram and the actual setup is shown below.