Dynamics of Machines - Part II - IFS.pdf

||y i (ω)|| [m/N]
Phase [ o]
0.8
0.6
0.4
0.2
−100
−150
−200
−250
−300
Excitation on Point 1
0
0 2 4
Frequency [Hz]
6 8
0
−50
point 1
point 2
point 1
point 2
−350
0 2 4
Frequency [Hz]
6 8
||y i (ω)|| [m/N]
Phase [ o]
2.5
2
1.5
1
0.5
−100
−150
−200
−250
−300
Excitation on Point 2
0
0 2 4
Frequency [Hz]
6 8
0
−50
point 1
point 2
point 1
point 2
−350
0 2 4
Frequency [Hz]
6 8
Figure 28: Forced Vibration – Theoretical Frequency Response Function (FRF) of the clampedfree
flexible beam when two concentrated masses m = m1 + m2 = 0.382 Kg are attached at its
free end (L = 0.610 m) and two additional masses m = m1 + m2 = 0.382 Kg are attached at its
middle (L = 0.310 m) – Natural frequencies of the 2. D.O.F. mass-spring system ”A”: 0.81 Hz
and 5.56 Hz.
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