Effects of the passive electromagnetic damper on the behavior of a fluid-conveying pipeline.

This paper studies the passive electromagnetic damper effects on the behavior of a pipeline conveying fluid. In this work, a uniform cantilever Euler–Bernoulli beam, a follower force, and a transversal force are utilized for modeling of the pipe, fluid force, and electromagnetic damping force, respectively. The passive electromagnetic damper includes a permanent-magnet DC motor, a ball screw, and a nut. The most important purpose of this study is first to decrease the pipe vibration amplitude resulting from the fluid velocity and then transform the dissipated energy into the electric energy. To achieve this goal, the stability and vibration of the model were investigated using Ritz and Newmark methods. The effects of the electromagnetic damper characteristics on the critical velocity were considered first, and then the energy storage of the passive electromagnetic damper was inspected. The results of simulation showed that the passive electromagnetic damper can simultaneously reduce the pipeline vibration and store energy up to 4.3 [mW] for low fluid flow velocity. [ABSTRACT FROM AUTHOR]