Hydraulic Model Test of the Bottom Outlet of Sivand Dam
This paper presents the results of hydraulic test of bottom outlet of the Sivand Dam. The aims of the hydraulic model test are, gate discharge characteristics and gate loading. Results for different gate openings are also compared with calculated values obtained by a finite element method. Key-Words: Hydraulic model test, Dam, Finite element method, Gate, Gate Discharge
A design criterion for dynamic stability of Tainter gates
Abstract Elastically suspended Tainter gates (radial gates) may induce a rigid-body vibration around the trunnion pin, accompanied by discharge variations. The fluctuating discharge causes a fluctuation of pressure acting on the gate which may induce gate vibrations. Such a small-amplitude flow-induced vibration of Tainter gates is described by a homogeneous integral-differential equation. In this study, this homogeneous equation is approximately solved to obtain solutions for the excitation ratio (negative damping ratio) and vibration frequency. The solutions are given for a variety of parameters, such as basic Froude number, mass ratio and equivalent damping ratio. The predictions are compared with experimental data on Tainter-gate vibrations. A design criterion is presented, which ensures the stability of Tainter gates with respect to a significant source of self-excited vibration that was previously ignored.
Field Tests on Natural Vibration Modes of a Tainter Gate
Tainter gates are frequently used as both low-head and high-head control structures. As far as low-head structures are concerned, they are among the most popular spillway or crest gates which serve to control the water level in and release the flood from large reservoirs. Obviously, their correct functioning and safe operation is of utmost importance for the security of the entire project of which they are a part.