Lab Report 6

Lab Report 6 - Laboratory 6 Cantilever Beam Vibration...

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Laboratory 6 Cantilever Beam Vibration Measurement James King Daniel Hegarty Mitch Formen ENME 351 Section 0103 Date: 11/21/09
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Objectives The purpose of this lab is to gain an understanding of accelerometers and vibration measurements through their use in a laboratory setting. We are also supposed to learn how to find and calculate the damping coefficient of cantilever beams if we are able to find the first few vibration frequencies of said beam. Instruments Used PC with National Instruments DAQ card Labview NI SCC-68 connector board NI SCC-SG03 2-channel half bridge signal conditioning module Cantilever beam (Aluminum 6061, E = 74 GPa, density = 2.77 g/cm 3 ) Strain gauges mounted to the cantilever beam o Nominal resistance: 120 Ω ± 0.1% o Gauge factor (GF): 2.1 ± 0.1% Accelerometer (sensitivity 10 mV/g) Caliper, ruler Set-up Exercise 6.1 For exercise 1, we had to connect the accelerometer and strain gauges on the beam to Labview so that we could record the data for our experiments. The lab manual also called for a hammer to be used; however we omitted this part because the hammers were to damaging to the beams in the past. The strain gauges were connected to the SCC-SG03 unit, while the accelerometer was connected to channel 2 of the ICP sensor. After everything was hooked up, we had to configure the DAQ assistant with the following parameters: Strain Parameters (for DAQ Assistant) Voltage Parameters (for DAQ Assistant)
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block diagram shown below. We ran the program without the filter the first time, so that we could see what the signal looked like before it was filtered. This step is very important, because the frequencies that we find in this part will be used in the next exercise. The next part was to find the damping ratio of the cantilever beam when we hit it with our finger. (plot with values used to find ξ)
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This note was uploaded on 02/13/2011 for the course ENME 351 taught by Professor Smela during the Spring '08 term at Maryland.

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Lab Report 6 - Laboratory 6 Cantilever Beam Vibration...

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