I need to find the excitation frequency of the system (rolling stock+steel sleeper+elastomeric rail pad) which is in immediate contact just with the width of sleeper. The issue is about proving the reduction in transmissibility coefficient over the bridge by replacing the rail pad placed between sleeper width and beam of the bridge with undersleeper rail pad placed along the length of sleeper between sleeper & beam of the bridge
The simplest way to measure transmissibility is the two accelerometer method. One accelerometer is placed directly above the rail pad (i.e. bottom flange of the rail) and the second accelerometer placed directly below the rail pad. You will also need a two channel data acquisition system as the output from the two accelerometers must be recorded simultaneously.
Excitation is from the moving train and the frequency will be the rotational speed of the wheels - cycles/min = rev. per min. Changing the train's speed will change the frequency. Similarly, limiting the train's speed will limit the maximum frequency.
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