Stationary and non-stationary vibration of atomising discs

This paper presents numerical results of a refined dynamic model for the vibration of atomising discs. The atomising disc is modelled as a thin Kirchhoff plate. Centrifugal and gyroscopic effects of the spinning disc are included in the dynamic model of the disc. As the molten metal spreads out on the disc surface, the inertia force and the self-weight from it as moving loads excite the disc to vibration even if the disc is perfectly symmetric.The influence of the rotating speed of the disc and the mass flow rate of the metal stream on the dynamics of the disc is investigated. It is shown that the disc motion consists of three stages, a downward deflection, non-stationary vibration and finally stationary vibration with multiple frequencies. The magnitude of motion decreases with increasing disc speed but increases with increasing mass flow rate.