Study on the Semiactive Control and Optimal Layout of a Hydropower House Based on Magnetorheological Dampers

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.

Optimal Layout Plan of Stands at the Macao Food Festival via Minimizing the Electrostatic Potential Energy with the Effective Charge as Popularity of Stands

“…[12] It can even be used to solve problems like using mathematical optimization to determine the optimal layout of a dining room during the era of COVID-19 [13] , within the intended span of a metro station, address the layout planning of a public bicycle system [14] or even improve the damping effect of the MR damper. [15] However, no article to date has been done on optimal stands locations for the Macau Food Festival. Therefore, the purpose of this study was to optimize the booth layout of the Macau food Festival, with which 140 booths were allocated among 200 possible locations, by approaching through minimizing Coublumb electrostatic potential energy while treating the stand popularity as the effective charge (EffQ), which was acquired by questionnaire survey and data analysis, where we classified booths into more popular ones with higher values of EffQ and less popular ones with lower EffQs.…”