🔊 Acoustic Attenuation Simulation - Impulse (Explosion)

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📚 Technical Documentation

Overview

The simulator has been developed following the equations of ISO 9613-1:1993 (atmospheric sound absorption) combined with Kingery-Bulmash empirical data (blast wave parameters) and the Friedlander waveform model (realistic shock wave shape).

Key Features

Physical Models Implemented:

• Kingery-Bulmash Overpressure Model ΓÇô Empirical polynomial relationships for blast pressure prediction based on scaled distance (Z = R / W^(1/3))
• Friedlander Waveform ΓÇô Realistic positive and negative phase pressure profiles with proper temporal dynamics
• ISO 9613-1 Atmospheric Absorption ΓÇô Frequency-dependent sound attenuation accounting for temperature, humidity, and pressure
• Ground Effect Modeling ΓÇô Distinction between reflective surfaces (concrete, asphalt) and absorbing surfaces (grass, forest, sand)
• TNT-Equivalent Conversion ΓÇô Support for multiple explosive types (TNT, Dynamite, C4, ANFO) with energy ratios

Simulation Capabilities

The tool allows you to explore:

• Explosive parameters ΓÇô Charge mass, type, and burst height
• Environmental conditions ΓÇô Temperature, humidity, atmospheric pressure
• Receiver position ΓÇô Distance and height above ground
• Ground characteristics ΓÇô Soil type affecting reflection and absorption
• Real-time spectrum visualization ΓÇô Frequency-dependent sound pressure level (dB)
• Geometric representation ΓÇô Visual diagram showing direct and reflected acoustic paths

Technical Specifications

• Frequency range ΓÇô 20 Hz to 40 kHz (1000 logarithmically-spaced points)
• Distance range ΓÇô 0.01 m to 10 km (with non-linear scaling for precision)
• Scaled distance range ΓÇô 0.05 to 200 m/kg^(1/3)
• Accuracy ΓÇô ┬▒10% for distances > 10 m (within Kingery-Bulmash polynomial validity)
• Validation ΓÇô Results cross-checked against TM 5-1300 and CONWEP standards

Limitations & Considerations

• Kingery-Bulmash polynomial range ΓÇô Most accurate for Z = 0.05 to 40 m/kg^(1/3); extrapolation used beyond this range
• Burst type ΓÇô Model supports both surface burst (hemispherical) and free-air burst (spherical) configurations
• Simplified ground model ΓÇô Uses frequency-dependent absorption; does not account for complex terrain or diffraction
• Single-point receiver ΓÇô Calculates spectrum at one location; does not model spatial distribution

🚀 How to Use

Simply adjust the sliders and dropdowns to explore different scenarios. The spectrum updates in real-time, showing how distance, atmospheric conditions, and ground effects influence the acoustic signature of the explosion.

🔬 Validation Status

✅ Verified: Kingery-Bulmash coefficients (a0=2.207, a1=-0.656, a2=0.0043) validated against official tables (ARBL-TR-02555). Test cases confirm accuracy within expected ranges.