Abstract: Fluid-solid coupling analysis was conducted to investigate the influence of flow-induced vibration on the opening and closing force of radial gate with Maerdang project as a case study. Results revealed that the vibration force caused by gate vibration and the change of friction coefficient and friction arm caused by gate vibration displacement were major factors affecting the opening and closing force. On this basis, the vibration system of the gate is simplified. The formula of gate panel pressure varying with vibration displacement was also derived based on the vibration theory. The method was applied to the calculation of the opening and closing force of radial gate in consideration of the influence on friction coefficient and friction arm. Comparison with numerical simulation results demonstrates the improved calculation formula of the opening and closing force enhances the calculation accuracy than specification formula does. The research finding provides a basis for the selection of hoist capacity in practice.

Key words: flow-induced vibration, radial gate, vibrating water pressure, point-to-face conversion, opening and closing force