lab9_Fall10

lab9_Fall10 - ME 365 EXPERIMENT 9 A FORCE MEASUREMENT...

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1 ME 365 EXPERIMENT 9 A FORCE MEASUREMENT TRANSDUCER Objectives: This two week experiment examines the performance characteristics of a device used to measure force. The force transducer consists of a cantilever beam fitted with three types of transducers: a strain gage, a linear variable differential transformer (LVDT), and a proximity sensor. The static and dynamic performance characteristics of each beam/sensor combination must be evaluated before a specific configuration may be chosen for a particular application. The procedure in this laboratory is deliberately vague. You may use any of the VIs and techniques from previous labs to accomplish your goals. It will be useful to review previous labs and the VIs that were used in each. Study the material on LVDT and Proximeter sensors in Appendix B. An additional exercise may be assigned. After completing this lab you should be able to: Experimentally determine static and dynamic performance characteristics for the three different configurations of a simple force transducer. Determine and measure the first four natural frequencies of the force transducer using various system identification techniques. Determine the usable frequency range for a transducer and explain why this is important. Procedure: The Cantilever Beam Force Transducer (CBFT): The beam and transducers will be referred to as a cantilever beam force transducer (CBFT). A schematic of the CBFT assembly used in this experiment is shown in Figure 1. Take a moment to identify the different components of the assembly. Figure 1: The Cantilever Beam Assembly
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Laboratory 9 A Force Measurement Transducer ME365 2 Background information on strain gages may be found in your course notes. Information pertaining to proximeter sensors and LVDTs is contained in Appendix B of this laboratory. The shaker consists of a coil, a permanent magnet, and a spring mounted in an assembly. Applying an alternating current to the coil caused the magnet, attached to a linkage, to move up and down. We will be using the shaker to excite the beam at various frequencies during the dynamic response portion of this lab. All three sensors require additional signal conditioning before an output voltage suitable for data acquisition may be obtained. Figure 2 depicts the necessary connections between these components. Figure 2: Instrumentation Connection Diagram Make the appropriate connections, and examine each signal on the oscilloscope while lightly tapping on the beam to make sure everything is working properly. You may wish to use a potentiometer to reduce particularly large signal magnitudes. The potentiometer on the bridge circuit should be used to zero the strain gage output with zero load. During the static calibration portion of the lab, you will be applying known weights to the end of your beam. You may wish to apply them now in order to properly adjust the distance between the proximeter and the beam. It is important that a small air gap remain between the proximeter and the beam under a full* load.
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Laboratory 9
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lab9_Fall10 - ME 365 EXPERIMENT 9 A FORCE MEASUREMENT...

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