Page 620 - Mechanical Engineers' Handbook (Volume 2)

10 Steady-State and Dynamic Behavior of Servoactuators and Servosystems 611

Figure 50 Electrohydraulic servovalve with pressure feedback. (From Ref. 35.)

namic performance. Such techniques are discussed in Chapter 15. The following discussion
is limited to techniques for improving the damping within the hydraulic portion of the sys-
tem; these techniques minimize the need to consider other electronic compensation tech-
niques.
Techniques for improving Damping
Three well-known techniques may be employed to introduce additional damping into the
open-loop system. First, underlap may be introduced into the servovalve, thereby increasing

Figure 51 Pressure–flow–current characteris-
tics of an electrohydraulic servovalve with pres-
sure feedback. (From Ref. 35.)