Noise & vibration 10−7 105 10−8 104


10−9


103


10−10


0


50


100 Frequency [Hz]


150


102


8


16


31.5


63 1/3 octave band center frequency [Hz]


Graph 3: modulus of the rail receptance (left) and one-third octave band RMS value of the third axleload of the AGC TER train (right) with a rail pad stiffness of 25MN/m (solid line), 60MN/m (dashed line), 150MN/m (dashdotted line) and 300MN/m (dotted line) (specific soil conditions corresponding to a previous test site).


very soft rail pads on a freight corridor in France. Effects on rail receptance, track mobility and ground vibrations generated by passing trains will be assessed during the trials which will place in August and September. These different solutions will have an immediate impact on the ground vibrations generated by acting on the track mobility and/or on the wheel rail interaction force. Furthermore, they will


also modify the interaction force distribution along the track which could also have an influence on the track defect generation and/or the track defect time evolution. In addition the results are likely to influence the track maintenance practices which the Rivas project is also studying. After measuring the vibration


reduction in the ground according to standard measurement procedures (ie at


a distance of 8m from the track), Rivas’ next step is to translate this mitigation effect to reduce vibration and ground borne noise exposure in buildings. This will be followed by a final study and evaluation of the corresponding reduction in residents’ irritation. Appropriate procedures for these trials have been developed within Rivas and will be presented at the completion of the project at the end of this year. IRJ


World’s Largest Manufacturer of New and Reconditioned Crankshafts


125


Irvine, PA USA 16329 Hermitage, PA USA 16148 Telephone 1.724.347.0250 Fax 1.724.347.0254 ecgsales@elwd.com


www.ellwoodcrankshaftgroup.com 40 IRJ June 2013


Modulus [m/N]


RMS axle load [N]


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