HW3 - Texas A&M University Department of Mechanical...

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Texas A&M University Department of Mechanical Engineering MEEN 260 Measurement and Instrumentation in Mechanical Engineering Fall 2010 Assignment #3 Due Monday September 27, 2010 Problem 1: (5 Points.) A spring of stiffness 200 N/m is in series with another spring of stiffness 250 N/m. Each spring has 10% uncertainty associated with its value. What will be the nominal stiffness and tolerance of the combination? Problem 2: (5 Points.) An engineer tests two sets of linear springs and determines the stiffness coefficients (N/m) for each spring. Determine if there is a significant difference (95% confidence level) in the stiffness coefficients between the two sets of data given below: Set 1 (N/m) Set 2 (N/m) 22.5 19 22.3 18 22 18 23 23 19 15 18 14.5 22 17 24 18 21 16 19 21 16 23 20 24 23 17 18 24
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Solution September 30, 2010 2 Solution Problem 1: The nominal value here is given by N/m. (1) The tolerance of the combination is given by (2) which means that the combination has a percentage tolerance of or 7.1%.
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HW3 - Texas A&M University Department of Mechanical...

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