Week 10

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• Test have been conducted with final dish, beams and sample pieces

• Damping tape has been applied to samples and tested-advantages are minimal

• Temp enclosed chamber has been created and optimization tests are being tested.

Accomplishments from Previous Week

• Test running with ice, bending beam and samples have been run (All)

• Control tests with Aluminum and various damping tape configurations  (Bryan, Paulo, Daniel W))

• Methods to produce flat ice (Paulo)

• Beam calibration (Daniel W.)

• Twisted Wires from strain gauge (Daniel C.)

• Data has been put into MatLab and smoothing function tested  (Bryan)

• Temperature enclosure has been assembled and is being finished and optimized (Daniel C.)

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• Compare with super hydrophobic sample (Daniel W. Bryan) (Wed 3/16)

• Operate friction tests in temperature enclosure (Paulo Daniel C.) (Thur 3/15)

• Calibrate the strain gauges bonded onto beams (Daniel W. Bryan) (in progress)

•  Compile all data (Daniel W., Bryan)(In progress)

• Finish Report and Poster  (Daniel C. Paulo)(Fri 3/16)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

• Better way to smooth ice

• We have been using a hair dryer to try to help just melt the top layer and also we are attempting a new method with a heated plate above the whole dish

• Use a Fourier Transform to get the resonant frequencies , are they a measure of the friction or material

• We are still writing some MatLab code to try and find the frequencies and with more data should be able to determine if it is the friction or the beam itself.

• By the end of the experiment relate back Tribology to the final conclusions. 

• We have plans to attempt to calculate the frictional coefficients and make some conclusions based on the nano-structure of the material versus the macroscopic scale of the ice roughness.

• Compare with Friction on Aluminum

• We have run tests with the materials on Aluminum but the friction is much higher so any beam similar to the size we plan to use bends too much.  We did notice that the beam bends more as the beam heats from the applied voltage

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

Twist and Shielded Wires?

• We twisted the wires from the strain gauge to the amplifier, Steve Roberts said shielding shouldn’t make a difference

For final report a table with different materials, and frictions and voltages on ice and aluminum and coefficient of frictions

• This is in progress we still need to get some better measurements on ice, one problem is the friction on aluminum was so much higher the beams deflect too much

Add different weights to validate tester (1/2 weight)?

•         We have been doing this and collecting data while dynamically adding weight, needs a bit more analysis for validation

Plot fitted, smoothed data

•         We wrote a program to read the text files from LabView and tested the best smoothing method need to consolidate all data

Calculate the resonant frequency of the beam

•         Still working on some code in MatLab to find these frequencies with the new beams we have been using

For report plot a graph of Force vs. Weight or normal force applied

•         Getting more data for this and are logging the data in Xcel

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

• None, currently.

Schedule

• Finish Calibration (Daniel W.) (Wed 3/14)

• Finish optimization of temperature enclosure (Paulo Daniel C.) (Thur 3/15)

• Test super hydrophobic sample (Daniel W. Bryan) (Thur 3/15)

• Finish logging data (Bryan)(Fri 3/16)

• Finish Report (Paulo, Daniel C.) (Fri 3/16)

• Finish Poster (Daniel W.)

Budget (list amount spent and amount remaining)

• $20 – Shim stock

• $35 – Aluminum to fabricate new dishes

• $30-  Dry Ice

• $80- Acrylic

• 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 to website (Paulo Daniel C.)

• Mostly complete need to proof read and add final data and conclusions (Bryan and Daniel W.)

• Both will be finished Friday (3/16)