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ME345_Lecture_38

# ME345_Lecture_38 - M E 345 Spring 2008 Professor John M...

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M E 345 Spring 2008 Professor John M. Cimbala Lecture 38 04/18/2008 Today, we will : Finish our discussion about mechanical measurements Do some example problems – mechanical measurements Do C a n d y Q u e s t i o n s f o r C a n d y F r i d a y Begin to review the pdf module: Pressure Measurement If time, do some example problems – pressure measurement Example Given : A prony brake dynamometer is used to test the output of a small engine: moment arm r = 11.30 cm ± 0.05 cm (measured with a ruler) force F = 36.5 ± 0.5 N (measured with a fish scale) rotation rate of the engine shaft N rpm = 2012 ± 1 rpm (measured with a strobotach) All measurements are to standard engineering (95%) confidence level. To do : Calculate the engine shaft power (in units of watts) and its uncertainty. Solution :

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Example Given : A white dot is painted on the shaft of a turbine. The shaft starts rotating at 860 rpm. Its rotational rate is measured by a stroboscopic tachometer. ( a ) To do : Name at least two strobe settings (rpm) at which the strobotachometer would give

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ME345_Lecture_38 - M E 345 Spring 2008 Professor John M...

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