Integrated System Build & Test
Table of Contents
To see all documents associated with this cycle, see our MSD2 Build & Test repository
Team Vision for Integrated System Build & Test PhaseDuring this cycle, the team hoped to accomplish the following:
- Complete subsystem testing - sensors, labview, controls
- Start integrated system testing - chamber, pneumatics, system assemblies
- Order, machine, and/or print all parts on BOM
- Update risks and project plan
Test Results Summary
Flow Meter TestingAfter consulting Dr. Slack of the RIT EE department, the flow meter was correctly setup to run with Labview. Initial testing proved that the meter was capable of sending a signal through the DAQ device to be displayed in Labview. Additional programming will be completed in the next phase to properly record the signal and translate it into meaningful data.
|LabView Screenshot||Flow Meter Setup||Flow Meter Breadboard|
IR Sensor Selection & Test PlansTo better measure & view the flow profile of the system (than with just the hall affect flow meter alone), an IR sensor was integrated into the system design. This will allow for real time, individual pulse readings, as opposed to system averages. The new sensor is to be mounted on the inside of the pneumatic end cap, where it will measure the distance of the piston from the sensor as it cycles to pump fluid. That distance, multiplied by the piston area will yield a stroke volume which can be recorded and displayed in LabView.
Further test plans include writing a LabView program to record input voltage as a function of measured distance to calibrate the sensor. The sensor spec's indicate a measuring range of 4 - 30 cm. The IR sensor was tested and confirmed to be compatible with LabView and met the requirements for integration into our system.
3 Way Valve Testing Success
Previous tests proved unsuccessful as the 3 Way Pneumatic Valve would get stuck in one position, without being able to cycle on / off. Once a diode was included in the circuit, the 3 way valve was able to function as desired.
Pneumatic Parts Acquired
|167 PSI 1/4" Pneumatic Tubing||Exhaust Muffler & 1/4" Push to Connect|
After extensive searching for an affordable supplier of pneumatic parts, the following items were finally purchased:
- 8' 1/4" pneumatic tubing, 167 PSI mamimum (wall pressure is no greater than 100 PSI)
- (3) 1/8" thread (1/4" tubing) push-to-connect elbow (one pictured above)
- (2) 1/4" thread (1/4" tubing) push-to-connect elbow
- (1) 1/8" exhaust air muffler for 2 way valve
Pneumatic parts were purchased from Power Drives Inc located on Brighton Henrietta Town Line road in Henrietta
Chamber Assembly (End Caps)
One of the more important risks was properly manufacturing the end caps & piston plates for the heart chamber. After exploring various 3D printing options, the end caps were finally printed in the Sustainability Building, and the piston plate was printed in The Construct located in Institute Hall.
Initial chamber assembly. One uniseal fitting is not included (Left hole) and diaphragm has yet to be cut down to size
Risk and Problem Tracking
- Updated Risk Management spreadsheet
Functional Demo Materials
**Note** The team is currently unable to download the PDF's of each standard due to technical difficulties. The link above will remain red until the issue is resolved