Research Article
Intelligent Control Strategy of Electrohydraulic Drive System for Raising Boring Power Head
Table 6
Meaning of each character in the text.
| | Symbol | Parameter meaning | Parameter value or unit |
| | Flow coefficient of solenoid proportional directional valve | — | | Hydraulic oil density | | | Area of solenoid proportional directional valve port | | | Outlet oil supply pressure | | | Spool displacement of solenoid proportional directional valve | m | | Outlet flow or load flow of solenoid proportional directional valve | | | Total leakage coefficient of hydraulic motor | | | Total volume of oil inlet chamber, oil return chamber, and connecting pipe of hydraulic motor | — | | Effective bulk modulus of elasticity | — | | Volume displacement per radian of hydraulic motor | — | | Angular displacement of output shaft of hydraulic motor | — | | Equivalent inertia of reducer | — | | Equivalent damping coefficient of reducer | — | | Input voltage | — | | Wire coil | — | | Current in coil | — | | Coil internal resistance | — | | Damping coefficient of valve core armature assembly | — | | Internal resistance of amplifier | — | | Voltage force gain of proportional electromagnet | — | | Quality of valve core armature assembly | — | | Displacement of valve core | — | | Spring stiffness of armature assembly | — | | Current magnet driving force | — |
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