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Unformatted text preview: These peaks can be sampled (MATLAB code, PeakLocationByMouse.m) and used in the logarithmic decrement theory for calculation of the damping. . In the above equation, the n is the number of cycles separating any two selected maxima. Choosing an initial peak as j=1 , it would have the largest y . Then successive peaks, n=[1,2,3. .] , have lower y as n increases as an integer. We could curve fit the (n, lny) curve and determine the best slope, C 1 . This is then used to calculate the damping ratio by finding the critical damping ratio. B. Calculating critical damping The critical damping is needed for the calculation of the damping coefficient. The natural frequency for a single mass case is obtained by examining the second data file, (f,A) , that has frequency in the first column and amplitude in the second column. The natural frequency is where the amplitude is a maximum. Be sure to convert to [rad/sec] units for frequency....
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This note was uploaded on 02/07/2011 for the course AE/ME 301 taught by Professor Lafleur during the Spring '11 term at Clarkson University .
- Spring '11