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ME345_Lecture_40

ME345_Lecture_40 - M E 345 Spring 2008 Professor John M...

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M E 345 Spring 2008 Professor John M. Cimbala Lecture 40 04/23/2008 Today, we will : Finish talking about strain gage pressure transducers. Discuss some additional items not in the pdf notes: McLeod gage, calibration of pressure transducers, pressure measurement in moving fluids Do an example problem – the Pitot-static probe Discuss other types of pressure probes If time, begin to review the pdf module: Linear Velocity Measurement Example Given : Jeri decides to use a soda can as a simple pressure cell. She mounts a strain gage on an empty soda can, much like was done in the strain gage lab. The soda can diameter is 66.0 mm and the wall thickness of the cylindrical portion is 0.105 mm. The aluminum has a Young’s modulus of 70. GPa and a Poisson ratio of 0.35. The strain gage has a no-load resistance of 120.1 Ω and a strain gage factor of 2.10. Jeri constructs a quarter bridge circuit using resistor R 3 as the strain gage. She sets the bridge supply voltage to 5.00 V. She balances
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