ExpB2 - EXPERIMENT 2: MEASUREMENT OF MICROSTRAIN IN A...

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EXPERIMENT 2: MEASUREMENT OF MICROSTRAIN IN A SECOND ORDER MECHANICAL SYSTEM 1. General Background and Procedure Many different mechanical systems can be set up to demonstrate damped, second order systems. A cantilevered beam with attached strain gauges is one of the simplest. The 2 strain gages have been mounted on the beam a few centimeters from one end. Since the resistances of the gages change only slightly, they must be incorporated in a Wheatstone bridge circuit, as shown in Fig. 1, so that small changes in the resistance are converted to measurable changes in the voltage. A Sensotec SA-B unit will be used to provide a 10 VDC excitation to the Wheatstone bridge as well as amplify the output of the bridge. Leads to and from the bridge should be connected to the SA-B unit as shown in Fig. 2. The cantilevered beam should be attached to the work bench as illustrated on the whiteboard. Using known weights, the strain gauge can be calibrated for forces applied to the end of the beam. Then the dynamic response to a non-zero initial displacement can be measured for two cases: the loaded beam and beam with a mass at the end. With sufficient care, measurements of the beam geometry and mass allow theoretical predictions to be made of the undamped natural frequencies of the system, and these can be
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This note was uploaded on 07/20/2009 for the course AME 341BL taught by Professor Spedding during the Spring '08 term at USC.

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ExpB2 - EXPERIMENT 2: MEASUREMENT OF MICROSTRAIN IN A...

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