Open Access

Table 1

Relevant parameters of electrohydraulic servo system of a certain type of CNC machine tool.

Parameter Value Parameter Value
Pressure source of the system ps/Pa 7 × 106 Oil bulk modulus βe/Pa 2 × 108
Return oil pressure of the system pr/Pa 0 Load mass m / kg 180
Viscous friction coefficient B / (N·s/m) 80 Current gain of servo valve ki / (m/V) 4 × 10−8
Initial volume of left cavity V01/m3 1 × 10−3 Internal leakage coefficient Cτ/ (m5/(N·s)) 7 × 10−12
Initial volume of right cavity V02/m3 1 × 10−3 Discharge coefficient Cd 0.6
Effective area of two cavities A / m2 2 × 10−4 Orifice area gradient ω/m 0.025

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