Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2016
Date : August 23, 2016 - August 26, 2016
An attempt to evaluate the impact noise due to rail joints was carried out by using the scale model tests. The derivation of law of similarity related to wheel/rail noise was made and actual phenomena can be estimated by the scale model tests. Through the measurement with an impact hammer, the vibratory characteristics of track and wheel are estimated in the scale model test with the law of similarity and they are compared with that of the actual track and wheel. It is found that overall trends are well-estimated. In the running test it is shown that the acoustic power of the impact noise is proportional to the power of 2.3 of wheel speed and it is possible that impact noise due to rail joints is simulated by the scale model test. To investigate a potential for impact noise reduction, the relation between impact noise and track parameters, e.g. a soft rail pad, is examined in the scale model test. It is indicated that soft rail pad leads to the reduction of the impact noise and sleeper vibration, though rail vibration is increased. The scale model test may also evaluate the properties associated with rolling noise. And in the vibration of the rail and sleeper the results obtained in the scale model test show a good agreement with those in the field test.
