Flow-Induced Multiple-Mode Vibrations of Gates With Submerged Discharge

Added mass and wave radiation damping for flow-induced rotational vibrations of skinplates of hydraulic gates

“…(1) Instability-induced excitation, due to a fluid instability (frequently linked to the fluid viscosity) as is the case in vortex shedding, as discussed, for example, in Bearman (1984), Nguyen and Naudascher (1986), Jongeling (1988), Billeter (2004) and Billeter and Staubli (2000); and, (2) movement-induced excitation, involving an initiating impulsive or vibratory structural motion such as a structural vibration mode or the coupling of multiple structural modes that produces a fluid perturbation which in turn reinforces the structural motion, as discussed, for example, in Ishii and Imaichi (1977) and Ishii and Naudascher (1992).…”

An Experimental Investigation of the Effect of Slot Vortex on Plane Gate Vibration

“…Thang [1] indicated that the excitation mechanism of vertical-lift gate was attributed to the combined effect of shear-layer instabilities and motion-induced vortices shed at the leading edge of the gate bottom. Billeter [2] also confirmed this conclusion by experimental study. Kostecki [3] predicted the two-dimensional flow field in the vicinity of an underflow vertical lift gate using numerical combinative modeling of the vortex method and the boundary element method.…”

Properties of single shear layer instabilities and vortex-induced excitation mechanisms of thick plates

“…An extended analysis of the structural dynamics and the excitation forces is given in Billeter (1998) and Billeter and Staubli (2000). To demonstrate the behaviour of the shear layer beneath the gate lip and its significance to gate vibrations, we assume an elliptic trajectory of the gate motion (i.e., an orbit) with the amplitudes x i and y i in streamwise and cross-flow direction, respectively:…”

“…and submerged discharge, as shown in Fig. 1 is given in Billeter and Staubli (2000) and Billeter (1998). The gate response to these excitation mechanisms is shown in Fig.…”