le04_student_report_excerpt - ME311 Mechanical Measurements...

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Unformatted text preview: ME311 Mechanical Measurements CM ____________ Name: ___________________________ Team No.____________ Date ____________ Report Excerpt The results, n = 47.8 rad/s and = 0.6, are our best estimates of the system parameters. The corresponding minimum value of the cost function is J1 = 0.080, and the transfer function is given by TFs=1(0.00044s2 + 0.024s + 1) (1) The comparison between the amplitude of the response predicted by the transfer function (1) and the experimental amplitude response (in dB) is shown in Fig. 5. The figure illustrates that the transfer function model predicts the experimental frequency response well except for a few points at higher frequencies. In this region the slope of the experimental response starts increasing. Figure 5: Bode Plot The increasing slope of the response at the higher frequencies in Fig. 5 indicates the possibility of numerator dynamics. The simplest possible numerator term that would account for this slope change is a first-order term given by s+1, where the time constant is the inverse of the break frequency b. The resulting transfer function is given by TF2(s) = sb+1s2n2+2**sn+1F (2) ...
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This note was uploaded on 04/17/2008 for the course ME 311 taught by Professor Adams during the Spring '08 term at Rose-Hulman.

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