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Acoustics

Noise Mapping · ISO 9613-2 Compliant

ISO 9613-2 sound propagation model with multiple point sources, noise barriers, and ground attenuation. Real-time 2D noise contour map, Lden calculation, and EU noise regulation comparison.

Source Settings
Ground Type
Receiver Height Hr1.5 m
Barrier Height Hw0 m
Barrier Distance dw50 m
Night Penalty (Lnight)
—
Max SPL (dB)
—
>65 dB Area (m²)
—
>55 dB Area (m²)
—
EU Compliance
Noise Map (x-y plane)
<40
>80 dB
SPL vs Distance (per source)

ISO 9613-2 Sound Propagation Model

Point source SPL: $L_p = L_W - 20\log_{10}r - 11 + D_I - A_{atm} - A_{gr}$

Atmospheric absorption: $A_{atm} = \alpha \cdot r / 100$  ($\alpha \approx 3.5$ dB/100m at 1 kHz)

Ground attenuation: $A_{gr} = -3(1-G_m)$ dB (low-frequency component)

Maekawa (barrier): $\Delta L \approx 10\log_{10}(3+20N)$, $N = 2\delta/\lambda$

Multiple source combination: $L_{sum} = 10\log_{10}\!\sum_i 10^{L_{pi}/10}$

CAE Integration: Noise assessments for factories, roads, and airports compliant with ISO 9613. Used as a quick estimation tool prior to BEM (Boundary Element Method) or FEM acoustic analyses. Supports EU Environmental Noise Directive (2002/49/EC).