Dynamics of Machines - Part II - IFS.pdf
Dynamics of Machines - Part II - IFS.pdf
Dynamics of Machines - Part II - IFS.pdf
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Imag(y i (ω)/f 1 (ω)) (i=1,2) [m/N]<br />
0.5<br />
0<br />
−0.5<br />
−1<br />
−1.5<br />
1<br />
0.5<br />
Real(y i (ω)/f 1 (ω)) (i=1,2) [m/N]<br />
0<br />
FRF − Excitation on Point 1<br />
−0.5<br />
0<br />
2<br />
4<br />
6<br />
Frequency [Hz]<br />
8<br />
point 1<br />
point 2<br />
Figure 30: Forced Vibration – Theoretical Frequency Response Function (FRF) <strong>of</strong> the clampedfree<br />
flexible beam when two concentrated masses m = m1 + m2 = 0.382 Kg are attached at its<br />
free end (L = 0.610 m) and two additional masses m = m1 + m2 = 0.382 Kg are attached at its<br />
middle (L = 0.310 m) – Natural frequencies <strong>of</strong> the 2. D.O.F. mass-spring system ”A”: 0.81 Hz<br />
and 5.56 Hz.<br />
47
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