Part 3 - Metro Gold Line Foothill Extension
Part 3 - Metro Gold Line Foothill Extension
Part 3 - Metro Gold Line Foothill Extension
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Noise and Vibration Technical Report: <strong>Metro</strong> <strong>Gold</strong> <strong>Line</strong> <strong>Foothill</strong> <strong>Extension</strong>, Azusa to Montclair<br />
July 2012<br />
Page 108<br />
Figure 34: Comparison of Force Density Levels (FDLs)<br />
The FDL is derived by measuring the train vibration (Lv) along an existing section of operational track<br />
and subtracting the measured LSTM:<br />
FDL = Lv - LSTM.<br />
As mentioned above, the FDL for the Cornfields 2008 measurement was made along Phase 1 of the <strong>Metro</strong><br />
<strong>Gold</strong> <strong>Line</strong>. The <strong>Gold</strong> <strong>Line</strong> currently operates with two different vehicles: Siemans and Ansaldobreda.<br />
Vibration measurements from the two vehicles showed similar results and were combined into one FDL.<br />
The measured vibration levels used in the calculation of the FDL are shown in Figure 35 below. The<br />
LSTM measured at the same site and also used in the calculation of the FDL is shown in Figure 36.