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Lecture%202_Uncertainty%20Analysis%20Div3

Lecture%202_Uncertainty%20Analysis%20Div3 - ME309 Fall 2009...

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ME309 Fall 2009 Lecture 2: Uncertainty Analysis Andrew Lee Maurice J. Zucrow Laboratories Purdue University West Lafayette, Indiana
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24 August 2009 Andrew Lee 2/12 Motivation Every experimental data contain uncertainty We need to know the validity of data before we use them for something serious If you can predict the sources of error, you can improve design, process, and product quality
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24 August 2009 Andrew Lee 3/12 Sources of Error What causes the uncertainties? Blunders in apparatus or instruments Fixed error (or systematic error) Random error
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24 August 2009 Andrew Lee 4/12 Random Error What is the diameter of the penny in mm?
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24 August 2009 Andrew Lee 5/12 Goal of Uncertainty Analysis Estimate the uncertainty of experimental measurements and calculated results due to random error
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24 August 2009 Andrew Lee 6/12 Procedures 1. Estimate the uncertainty interval for each measured quantity Multiple measurements: look at the distribution Single measurement: +/- half the smallest
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