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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(a) Amplitude [m/s 2 ]<br />
(b) Amplitude [m/s 2 ]<br />
x Signal 10−5<br />
5<br />
0<br />
(a) in Time Domain − (b) in Frequency Domain<br />
−5<br />
0 5 10 15<br />
time [s]<br />
20 25 30<br />
x 10−5<br />
2.5<br />
2<br />
1.5<br />
1<br />
0.5<br />
0<br />
0 5 10 15 20 25<br />
frequency [Hz]<br />
Figure 21: Beating phenomena with two transient responses – Two spring-mass systems with 1<br />
D.O.F. each, vibrating with very similar natural frequencies (transient responses), resulting in<br />
beating phenomena: Spring-mass system ”A” with three masses m = m1 +m2 +m3 = 0.576 Kg<br />
fixed at the beam length L1 = 0.285 m, resulting in a natural frequency near 1.75 Hz; Springmass<br />
system ”B” with masses m = m4 + m5 = 0.382 Kg fixed at the end <strong>of</strong> the beam L1 =<br />
0.310 m, resulting in a natural frequency <strong>of</strong> 1.75 Hz<br />
29
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