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Road Traffic Noise Analysis
(Free Propagation):
Exercise I Objectives:
Students develop an acoustical model by setting up a geometrical model including
a straight road section and 8 buildings and defining the calculation parameter. The
noise contour graphic shows the free field propagation areas and the areas with
reflections & screening (building).
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Road Traffic Noise Analysis
(with 20 ft berm):
Exercise II Objectives:
Students add ground elevation into the model. A 20 ft berm surrounding a
city park is entered into the model. The noise contour graphic shows the free
field propagation areas, the areas with reflections & screening (building) and some
screening due to the topography. |
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Road Traffic Noise Analysis
(Difference Map):
Exercise III Objectives:
Students compare the noise prediction without and with the 20 ft berm.
The noise contour graphic identifies the areas with no and with traffic noise
reductions. The effectiveness of the berm changes dramatically with increasing
distance to the road and to the berm. |
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Road Traffic Noise Analysis -
Horizontal / Vertical Map:
Exercise IV Objectives:
Students generate graphics based on horizontal and vertical noise contour maps.
The cross sectional noise contour visualizes the screening effect of buildings &
the topography. |
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Chiller Noise Analysis:
Exercise V Objectives:
Students include a Chiller Unit into the acoustical model. Fans on top of
the chiller are defined as point sources. All walls are defined as area sources.
The sources are entered with spectral sound power level data.
Predictions are computed with different meteorological conditions (Wind, Humidity,
Meteorological Stability). |
