Vibration Characteristics and Occurrence Conditions of Self-Excited Vibration in a Flow Dynamics Conveyor

Abstract

This paper presents a dynamic stability analysis and experiments of the self-exited vibration occurring in a flow dynamics conveyor. In the dynamic stability analysis, an analytical model is constructed for a load supported by air pressure and an arc-shaped trough. In the analysis, the air flowing through the gap between the weight and the trough is modeled, and a coupled fluid-structure model is constructed to account for the compressibility of the air. The effects of parameters such as the mass of the load, the flow rate of supplied air, and the elasticity of the trough on the vibration characteristics and the conditions under which self-excited vibration occurs were clarified. The validity of the analytical model was verified by comparing the analytical results with those obtained from validation experiments. Furthermore, the local work distribution of unsteady fluid forces acting on the load and the trough surface is investigated, and the instability mechanism of the self-excited vibration is discussed.