Abstract
An effective way to reduce noise from railway track is using a rail vibration absorber. A compound track–absorber model is developed to study the effectiveness of the rail absorber and the influences of its bending modes. In the model the rail absorber is represented by a damped beam–spring system attached to the rail. The calculation results show that the decay rate of rail vibration along the track is significantly increased around the tuned frequency of the absorber and thus the rail vibration energy is substantially reduced in the corresponding frequency region. In addition, the pinned–pinned resonance of track vibration is suppressed by the rail absorber. The results also show that it is the rigid body motion of the beams of the absorber that leads to energy dissipation of rail vibration, whereas the bending deformation of the beams is a minor factor. Therefore, a simple mass–spring model is enough to represent the rail absorber instead of an advanced beam–spring model.
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