07/2398 - Request for information response [As Published] · 132007.2398

aslt
7 Rail Noise Assessment

The PEN-3D model railway module incorporates a standard environmental model to determine air
absorption, ground and barrier effects. The railway model incorporates propagation equations
consistent with a moving line source. It essentially simulates a train moving along the designated
railway line at the appropriate speed and calculates the Lmax. The model uses as inputs the source
noise level of the locomotive and wagons, or in the case of an electric train the passenger units, the
length of the train the source height and the speed of the train. The source height was assumed to
be 2.5m.

The Lmax source noise sound power spectrum used in the model is shown in Table 4.3, which is
representative of a diesel-powered freight train.

7.1 Verification of Rail Noise Model oe

The results of the noise survey carried out on 08/03/09 to 09/03/09 at monitoring Location NM2 i
have been used to verify the rail noise model. :

The rail verification model uses the existing conditions to determine the Lmax. Table 7.1 compares
the results obtained from the noise survey with the calculated results from the computer model.

Table 7.1 Calculations and Existing Noise Measurements Free Field

 

 

 

Receptor Height Measured Lmax Noise Level . Calculated Lmax Noise Level
(m) dB(A) dB(A)
1.2m 83.0 83.3

 

 

 

 

The rail noise model is considered to be verified since the calculated levels are within + 2.0 dB(A) of
the measured level.

7.2 Assessment of Predicted Noise Levels

The predicted noise levels in terms of the Lmax are shown in Appendix A.

 

The nominated Lmax noise level goal of 87 dB(A) is predicted to be met external to proposed
facades as shown in Appendix A. .

The nominated Leq(24 hour) noise level goal of 65 dB(A) would be met at all facades, since the
measured Leq(24 hour) on the boundary adjacent to Cooroy Connection Road was 61.6 dB(A), i.e.

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