Research on semiactive vibration reduction of fluid-structure interaction water-supplying pipeline

To reduce the vibration of water-supplying pipelines, a semi-active control method for pipelines based on magnetorheological damper is proposed. This paper first established the partial differential equations of the pipe element with hinged ends, and further converted them into a system of differential equations through nondimensionalization and Galerkin method, obtaining the state space expression of the system. Based on the model of linear dynamic absorber, the switch control law of magneto-rheological damper is designed, and the three coefficients of the switch control law are optimized using random fractal search algorithm. A simulation model of the entire system was established and the simulation verification are done. The simulation results showed that using the above-mentioned semi-active control law can significantly reduce the vibration of the pipeline system under the action of excitation of water flow and external excitation of the power source.