Page 73 - Thomson, William Tyrrell-Theory of Vibration with Applications-Taylor _ Francis (2010)
P. 73
60 Harmonically Excited Vibration Chap. 3
Figure 3.3-4. Experimental balancing of a thin disk.
Example 3.3-2
A thin disk is supported on spring-mounted bearings, as shown in Fig. 3.3-5. When
run at 300 rpm counterclockwise (ccw), the original disk indicates a maximum
amplitude of 3.2 mm at 30° ccw from a reference mark on the disk. Next, a trial
weight of 2.5 oz is added to the rim at 143° ccw from the reference mark, and the
wheel is again run at 300 rpm ccw. The new amplitude of 7 mm is then found at 77°
