Abstract
With the continuous development of hydropower stations, the capacities and the heads of hydro generator units are increasing, and the plant vibration problem is becoming more and more serious. A numerical simulation method for the vibration reduction control of magnetorheological (MR) dampers suitable for large-scale complex structures was proposed. The method is simple and easy to implement, and the semiactive control of the MR damper could be achieved by adjusting the current switch and size. On the basis of a numerical simulation, a mathematical model for the optimal layout of an MR damper device was established. The objective function was the vertical velocity and the vertical acceleration response of the generator floor. The results showed that the proposed semiactive control numerical simulation method could be applied to the vibration control of the hydropower plant structure, and the vertical velocity and vertical acceleration were reduced by 10.96% and 12.90%, respectively, compared with those without structural vibration control. At the same time, the proposed optimized layout method was effective and feasible, and the damping effect of the MR damper could be effectively improved through the optimized layout.
Highlights
E process of reducing the dynamic response of the structure is called structural vibration control by applying a control system to the structure to make the structure resist the action of dynamic load [10]
Hazaveh et al [25] used discrete wavelet transform (DWT), a linear quadratic regulator (LQR), and a limiting optimal control algorithm to determine the optimal control force. e semiactive control performance was evaluated by comparing the maximum displacement, the total shear force of the substrate, and the control energy. e damping effect of the MR damper depended on the size of the input current, the control method, and the arrangement of the MR damper
To solve the shortcoming of the simple bang-bang control algorithm, in that the acceleration would change suddenly, we proposed an improved simple bang-bang control algorithm to achieve the semiactive control of the MR damper
Summary
MR damper is currently the fastest research and development field for MR fluids. It is a new type of intelligent damping device that uses MR effects. It is composed of electrical control lines, piston rod, piston, orifice, and buffer accumulators. MR damper has a simple device, low energy consumption, fast response, large damping, and wide dynamic range. E damping force can be controlled by adjusting the current or voltage, so it can be well integrated with the control system. K0 f control system fails, it can be used as a passive controller with strong reliability
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