Conceptual design of dynamic vibration absorber for mitigation of subway tracks vibration

The vibrations and sounds of the train movement that cause damage to buildings close to the train lines are one of the critical challenges for constructing urban rail lines. The system's vibra-tion causes acoustic noise, and it is necessary to use vibration absorbers or viscose dampers to control it. In this study, a dynamic absorber is presented, which absorbs the vibrations without transferring them to the support and depreciation of sound energy. For this purpose, modal anal-ysis of rail track has been done, and vibrational behavior of subway track has been investigated. The vibration model of the rail track has been decoupled into four degrees of freedom system. The similarity of mode shapes obtained from the experimental test and gained from modal anal-ysis indicates the accuracy of the presented vibration model. According to the theories expressed and optimization in MATLAB, the optimal parameters for vibration absorber has been investi-gated. It is shown that utilizing an absorber can mitigate rail sound and vibration