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Looking for an example of a Simple DOE

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  • #38571

    miranax
    Participant

    Hello all.  I am in the process of preparing an introductory DOE course at the company I work for, and I need a simple 2^3 DOE example.  The idea is to have the students actually do the experiment (in this case it will be full factorial), so that they learn the basics of how, who, when, where and why.  Does anybody know links that will direct me to find such academic examples?  It will be greatly appreciated.

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    #115497

    Schuette
    Participant

    I remember a good DOE on the composition of silly putty. It may have been from one of the statistics software firms. Perhaps someone with a better memory can help.

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    #115499

    Anonymous
    Guest

    Miranax,
    What you asking for is gold dust. As soon as someone posts a good experiment everyone will copy it and claim it as their own! Here are some ‘throw aways’ for you to try:
    A kid’s experiment published on the net called craters involves dropping balls of different sizes into a variety of materials, such as flour, sugar or pearl barley, etc. The goal is to produce the largest craters!
    I don’t know if this will give an interaction, but you can try it yourself and find out!
    Other ideas I’ve considered include mutual inductance, Chladni’s figures, and Lego racing cars. (For the latter I glue several pieces together and hide blobs of solder in one combintion and ask teams to ‘fault find’ why one car goes further when rolled down a ramp than the other.
    Sorry I can’t be more helpful … good luck!
    Andy

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    #115500

    karl
    Participant

    Use a catapult
    Very angle settings, stop pin on the radial, and another static pin location.  3 factor two level or three levels depending on the the stop pin setting

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    #115502

    EdG
    Participant

    There is the “Paper Helicopter” example that is pretty good.  You vary paper type, body length, and wing length.  The goal is to come up with the best design that can stay aloft the longest.
    Good luck, EdG

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    #115504

    miranax
    Participant

    got that one…
    the other one I have is the one where you have to maximize the number of bends of a paper clip (heat treated, non-heat treated, Size 1 and Jumbo).  Problem is that finding the “right” clips is hard.
    The catapult example is an excellent one, although I don’t foresee a bunch of engineers hurling things across the administrative area of the building…
    thanks for the postings so far!

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    #115506

    pady
    Participant

    catapult is one one of the best expample for this to be more interactive.
    very famous in teaching these kind of examples and are available in many of the books
    -pady

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    #115511

    John R
    Participant

    Heating water in a microwave and measuring evaporation is what I used for my DOE.  Different bowls, different liquids, covered, or uncovered.  We also found a difference in heating for specified time, measuring, and then heating again as opposed to heating all at once.
     

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    #115527

    RK
    Member

    Try this link
    http://curiouscat.com/bill/101doe.cfm
    Regards

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    #115530

    Bob J
    Participant

    Miranax,
    Probably half of our BB classes are engineers and the catapults are always a hit ;-)
    Best Regards,
    Bob J

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    #115558

    miranax
    Participant

    Thanks to all responses so far.  After checking out several web-pages, I think I found what I was looking for.
    Experiment: Time it takes to dissolve an Alka Seltzer
    Factors: Water (hot, cold), Alka Seltzer (whole, cut in half), cola (non, 1 tablespoon).
    A simple 2^3 full factorial can be designed this way.  The idea came out from Launsby’s page.
     
    Once again, thanks!

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