Integrated System Demo
Table of Contents
Team Vision for Integrated System DemoFor this phase, the team will be focusing on machining all remaining parts with the help of the machine shop employees. During the next three weeks, two sub-assemblies, vessel and active valve, will be tested and then put together for the final assembly. Also, by the end of this phase any equipment or parts as far as sensors, valves, tubes, bolts, nuts, etc will be purchased. There will be no further purchasing after this phase unless absolutely necessary. Another goal of this phase is to complete programming the interfaces and acquiring displacement and pressure curve plots. On the side, the team will be continuously working on developing the technical paper and the poster.
Displacement Measurement SystemTo obtain the displacement graph, hall effect sensors were used in the assembly to measure the change in the magnetic field caused by the movement of the magnet inside the poppet. The voltage output was then converted to displacement.The plot below shows the calibration curve obtained for one hall effect sensor. Each sensor was calibrated separately before it is used in the assembly.
The plot below is the actual displacement of one poppet measured by the hall effect sensor. When the poppet is fully open, its position is approximately at 0.02 inches and when it’s fully closed, its position is at approximately 0.14 inches.
Pressure Sensor Calibration CurveThe pressure sensor used in the assembly to measure vessel pressure, was calibrated before use. The plot below show three calibration curves, each with a different voltage input.
LabView CodeLabView controls outputting displacement of the poppets position. The input window controls vacuum valve, inlet valve, and outlet valve assembly. Inputs include the pulse width, DC peak-to-peak voltage, DC offset, and frequency. The input for all control signals are square waves.
The flow path of pressurized air through the Active Valve Assembly is shown on the diagram below. Air flows (top to bottom) from the vessel through the valve assembly where the poppets are in open position allowing air to flow freely, then into passages that release into the ambient air.