Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Finished data collection under open air in multiple pipe scenarios in the backyard configuration.
Halfway through test bed construction. Require poly-carbonate pieces, 80/20 bolt assemblies to attach poly-carbonate, water pump (sponsors are providing), and water reservoir.
Accomplishments from Previous Week
Successfully recorded data from backyard setup via USB serial communication with Teensy under multiple experimental set ups under open air. Worked out all bugs with the terminal truncating written data.
Wrote script to produce FFT plots for side-by-side comparison of two tests under adjustable time intervals (Matlab)
Acquired LabVIEW data acquisition device from Greg, with audio compatibility.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Fill in trench and take data to compare with open air tests. All
Expand Matlab script to be more robust; perform mathematical analysis of the side-by-side frequency domain comparisons in addition to the visual representation. Sam
Write LabVIEW VI to take data from audio in, and write it to text file for analysis. Bryan
Finish FEM analysis of valve section. Madeline
Design and draft proposal for tabletop pipe layout. Gordon
Assemble test bed. All
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Shift in data between broken and unbroken vary in degrees of damage (aka degrees of opening at valves). Up to you to determine whether it is a spectrum of variance or a series of steps.
The spike of data is based on the evacuation of air in the pipes and the time of pressurization of water in the pipe.
You should take a video to correlate when the each of the sprinkler heads release water with the time of the signal in our data.
Another method can be to measure the pressure with a sensor as close as possible to the accelerometer and see any correlations between pressure and accelerometer readings.
Agree with instructor comments concerning the need to look into fastening materials/mediums.
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
You should avoid using higher order filters because those cut off the signal more dramatically and have steeper slopes approaching the -3 dB frequency.
What causes and/or affects the time delay present in your data? Try using different physical set ups to change how the signal changes in response.
Try to understand what phenomena is causing the data spike.
A suggestion is to use multiple accelerometers in conjunction with your current one to gather more information on this phenomena.
Contact the accelerometer manufacturer to get their recommendations on fastening the sensor.
To minimize distortions in your data, look into finding mediums to put between your accelerometer and the PVC pipe that have similar acoustic impedances with your pipe.
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
Risks and Areas of Concern
Drain system in/on the test bed leading to the water reservoir underneath (proper drainage while maintaining good appearance)
Making sure the pipe setup on the test bed is modular enough and also is believable as a replacement for in the ground pipes.
Schedule
Assemble test bed this week
Move testing away from the house to the test bed by the end of the week.
Next week move the test bed to campus.
Budget (list amount spent and amount remaining)
$653 Spent
$1847 Remaining
Progress on Report and Webpage
Uploaded more pictures
Updated report with standards section