Homework 6 Solution

Homework 6 Solution - MEEN 260 Introduction to Engineering...

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MEEN 260 Introduction to Engineering Experimentation Homework 6: Strain Gauges and the Wheatstone Bridge Circuit Assigned: Thursday, 26 Feb. 2009 Due: Thursday, 5 Mar. 2009, 5:00 pm Note: All Homework problems assume the Wheatstone Bridge configuration shown: Figure 1: Wheatstone Bridge Homework Problems: Problem 1) Consider a Wheatstone Bridge circuit where ( ) ( ) [ ] in R R R R R R out V V 4 3 4 2 1 2 + + = . Assume that R 1 = 150 , R 2 = 320 , R 3 = 75 , R 4 = 80 , and V in = 5V. If another resister is placed in parallel with R 1 , determine its value such that the bridge will be balanced. Problem 2) This is problem 12.20 of the textbook. For your convenience, the problem statement is repeated here: a.) Show how strain gages may be mounted on a simple cantilever beam, and placed in a Wheatstone Bridge circuit, to sense temperature change while being insensitive to variations in beam loading. b.) How could you arraign 1, 2, 3, or 4 strain gages to compensate for temperature? Problem 3) This is similar to problem 12.7 of the textbook. Please refer to the figures in the textbook. For your convenience, the problem statement is repeated here. The Sensing element of a weighing scale is described in Problem 6.11. Four strain gages are located as shown fig. 12.17. The gages are connected in a full bridge (see case G, Table 12.4). Their nominal resistances are 300 ω and their gage factors are 3.5. If the bridge is powered with a regulated 5.6-V dc source, what will be the voltage output
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Homework 6 Solution - MEEN 260 Introduction to Engineering...

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