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HW10-S10

HW10-S10 - ME 365 HOMEWORK SET 10 Out Thursday April 8 2010...

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ME 365 HOMEWORK SET 10 Spring 2010 Out: Thursday, April 8, 2010 Due: Thursday, April 15, 2010 Bridges, Strain Gages and Variable Impedance Devices Problem 1. Wheatstone Bridges are used with many different types of resistive sensors. The values of the fixed resistors used in the bridge depend on the type of sensor used. If the sensor is located in position R 1 in the bridge and the bridge is balanced when R 1 is at its minimum value (R 1 = R 1min ), then the balanced condition is: 2 3 min 1 4 R R R R . If we use this relationship then we can eliminate R 4 from the bridge equation and we can rewrite the bridge equation as: r r x x v 1 1 , where v = E out /V supply , r = R 3 /R 2 , and x = R 1 /R 1min . Make a plot of v versus x, for x in the range 0.1 to 2.0, with r set to the following values: r = 0.1, 1.0, 10.0, and 100.

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ME 365 HOMEWORK SET 10 Spring 2010 Out: Thursday, April 8, 2010 Due: Thursday, April 15, 2010 Problem 2. The torque wrench shown in the figure below is claimed to produce an output voltage e o proportional to the torque applied by force f
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