Application of dynamic vibration dampers for vibration protection of bridge structures

Introduction. The increase in traffic intensity and the prospects for the development of high-speed railway transport require solving the problem of the effectiveness of vibration protection of transport infrastructure facilities by developing innovative solutions. Currently, the issues of combating vibration in relation to the span structures of bridges and overpasses are insufficiently studied. The purpose of the work is to study the promising directions of vibration protection of bridge structures based on the use of dynamic vibration dampers.

Research methodology. To achieve the goal of research and implementation of effective technical solutions in the field of vibration protection of bridge structuresimproved design of dynamic vibration damper is proposed in which inertial mass is fixed on two springs, upper of which is connected to structure protected from vibration, and lower spring to base or foundation of object. Oscillations are damped due to oscillations in antiphase due to free and forced oscillations of auxiliary inertial masses protected from vibrations. This technical solution makes it possible to balance forces of elastic interaction of damping device and object protected against vibration and moments from these forces.

Results. As a result of experimental studies of the prototype of the improved dynamic vibration damper installed on the vibration stand, it was found that the vibration levels in all directions significantly decreased, including in the vertical direction by 5.7 times.

Discussion and conclusion. The obtained positive results of experiments and the relative simplicity of the proposed design make it possible to propose this method of vibration protection of superstructures for both newly designed and already in operation facilities. It is especially important to minimize the possibility of resonant phenomena and pitching. The results of the study will make it possible in the future to ensure the effectiveness of vibration protection of oscillating machines, mechanisms and infrastructure facilities.

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