Resonance Analysis of High-Frequency Electrohydraulic Exciter Controlled by 2D Valve

Figure 3

Valve ports I and III open; piston moves to the right (a), and valve ports II and IV open; piston moves to the left (b). 1: cylinder, 2: sleeve, 3: spool, 4: window, 5: groove, and 6: excited object.

(a)

(b)