Abstract: Self-excited vibration in solenoid valve is one of the noise sources and it will cause unstable working of pneumatic system. In order to study self-excited vibration in solenoid valve under different working conditions, the vibration is studied numerically and experimentally. A dynamic model coupling vibration of solenoid valve with fluid flow in valve is developed. The model is validated by experimental results. Working state of the system, effects of structural parameters are discussed. A review of the numerical results obtained indicates that for low working pressure and small working flow rate, the equilibrium point of the system is unstable, “soft self-excited vibration” occurs due to infinitesimal disturbances. The solenoid valve undergoes soft self-excited vibration, hard self-excited vibration, with the increase of supply pressure or supply flow rate leading to stable working. Increase in db and decrease in da, z0,  will improve anti-disturbance capacity and enlarge stable working region of the solenoid valve.

Key words: Dynamic model, Self-excited vibration, Solenoid valve