Kollmorgen
Commissioning
SILVER
LINE
®
Product Family
5-9
5.2.1 Critical Damping
Generally, the most desirable amount of damping is Critical Damping. Critically damped systems respond as fast as
possible with little or no overshoot. The graph in Figure 5-2 shows the velocity response of a system to a square
wave input when the system is critically damped.
0.00
0.20
0.40
0.60
0.80
1.00
1.20
0.000
0.025
0.050
0.075
0.100
Tim e (seconds)
Figure 5-2 Critical Damping
5.2.1 Underdamping
Sometimes the system is tuned for critical damping and the system is still too slow. In these cases, you may be
willing to accept less than critical damping. For applications that can work properly with a slightly underdamped
system, you may reduce the stability to improve the response. The graph in Figure 5-3 shows a slightly underdamped
system.
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
0.000
0.025
0.050
0.075
0.100
Tim e (seconds)
Figure 5-3 Underdamping
5.2.2 Overdamping
An overdamped system is very stable but has a longer response time than critically damped or underdamped systems.
Also, overdamped systems are noisier than less damped systems with the same response rate. The graph in Figure
5-4 shows an overdamped system.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
