Overview of Status of Analysis, Design, Fabrication, Tests, etc.
New dish design has been fabricated and works!
Strain Gauges have been bonded on several different sized beams
Damping tape samples have been requested and are shipping
Bending beam tests on hard drive tester being set up
Static bending beam tests with strain gauges have provided consistent results
Accomplishments from Previous Week
Bonded strain gauges to several different beams (Bryan Daniel W.)
LabView and DAQ have been connected to computer and produce results (Bryan)
Machined two new redesigned dishes (Daniel C. Paulo)
Requested and will receive a sample of a 3M damping tape (Daniel W.)
Circuit has been created with strain gauge and amplifier and produces changes in voltage (Bryan Daniel W)
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Apply 3M damping tape to beam (Daniel C. Paulo) (Monday 3/5)
Design Temperature Enclosure and order or obtain parts (Paulo Daniel C.) (Tuesday 3/6)
Test and calibrate the strain gauges bonded onto beams (Daniel W. Bryan )(Sunday 3/4)
Obtain an estimate of Teflon coefficient of friction from strain gauge( Daniel W., Bryan)(Wednesday 3/7)
Twist and shield wires, and clean up wiring in circuit (Daniel C. Paulo)(Sunday 3/4)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments
Obtain some data with the strain gauge
We were able to take some static measurements and dynamic with the strain gauges and successfully obtained some data
Work on fixing the vibrations
We ordered and are awaiting the 3M damping tape
Get the entire setup to function together
We successfully wired all of our circuit and power sources and showed him in his lab yesterday
Instructor Comments from Last Meeting and Actions Taken to Address these Comments
Create one document or spreadsheet in which thickness, height, expected strain, expected coefficient of friction and the percentage of the overall strain gauge strain.
We just drafted one in Xcel and have used it to estimate the expected strain and likelihood that we could measure it
What percentage of micro-strain should we use to get a good signal/noise ratio?
Emailed Vishay and are expecting an answer in the next day or two
Make a list of limiting factors for thickness
Vibrations from airflow alone are a problem not to mention from the roughness of ice
The beam easily permanently deforms when a force is applied even for a short amount of time
When cut the beam does not hold its flat shape
Read spec sheet for the AD524 and make sure you are not ground looping.
Reviewed the AD524 spec sheet and printed out the pin layout and the page which shows the ideal setup for a Wheatstone bridge
The circuit is currently working properly and we followed the instructions to prevent ground looping and alone has relatively little noise
See if we can buy a freezer
We found an old one in Professor Talke’s lab which we are using now
Speak to Steve Roberts about shielded/ twisted wires
Received some shielded wire to use from the amplifier to the DAQ and will be purchasing wire shield this weekend for the rest of the circuit
Risks and Areas of Concern
Ice deforming after a matter of rotations and creating more friction
Strain gauge resolution being too small to measure differences of coefficient of friction sufficiently
The amount of noise may overwhelming the signal
Vibrations still being too large
Resources or Information Required but not Available
We would like to use a large freezer to test the hard drive tester which was provided. We have no knowledge about the tester because it is so old and would like to see its performance at low temperatures
Schedule
Apply 3M damping tape to beam (Daniel C. Paulo) (Monday 3/5)
Design Temperature Enclosure and order or obtain parts (Paulo Daniel C.) (Tuesday 3/6)
Test and calibrate the strain gauges bonded onto beams (Daniel W. Bryan )(Sunday 3/4)
Obtain an estimate of Teflon coefficient of friction from strain gauge( Daniel W., Bryan)(Wednesday 3/7)
Finish second rough draft of report and webpage (Fri 3/2)
Finish user manual (All) (3/14)
Documenting each activities for use in final report (All)
Budget (list amount spent and amount remaining)
$20 – Shim stock
$35 – Aluminum to fabricate new dishes
Now have a $500 budget but still need to run purchases by Professor Talke
Progress on Report and Webpage
Webpage has all individual component reports
Webpage has weekly progress reports and all the presentations
CAD drawing on front page
Add actual pictures, video and more updated info (Paulo Daniel C.)
Report – keeping data and pictures of our preliminary tests for use in the report (Bryan and Daniel W.)
Second draft of report will be finished by Friday (3/2)