SoundPLAN - Railroad Noise Calculation Module

Noise Contour Map 1: Navcon Engineering measured the emission levels of an existing Light Rail System. A 3 dimensional acoustical model was developed using the acquired noise data to calibrate the model. The noise levels were computed over a calculation area. The results are contoured using a Bezier algorythm [High sound levels : red / blue color Lower sound levels: yellow / green colors]. Map 1 shows the Analysis without a barrier along the Light Rail System.

Noise Contour Map 2: Navcon Engineering design a noise barrier to effectively reduce the noise impact into the residential area. Map 2 shows the Prognosis with 8 ft noise barrier along Light Rail System

Difference Contour Map 3: A difference contour map [Analysis without barrier - Prognosis with barrier] is probably the most effective way to visualize how a barrier changes the propagation of noise.  The difference map basically shows the spatial variation of the noise reduction.  For example in cases in which buildings already provided noise reductions (see 2nd and 3rd building row) the additional barrier is less effective. 

The three noise contour maps show:

Blue line: Buildings and walls
Pink line: Light Rail System (Line Source)
Green Line: Noise Barrier
Red Stars: Receiver Location

Application:

• Visualizing the noise propagation on both sides of the track
• Buildings are effective as reflective surfaces and also as noise barriers
• Free field noise propagation on the South-East side of the track

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Last modified: July 06, 2011