Duct Silencer Insertion Loss & Airflow Pressure Calculator
Compute octave-band acoustic insertion loss (dB), airflow pressure drop, and regenerated aerodynamic self-noise for dissipative rectangular splitters.
Silencer Geometry & Flow
Attenuation & Aerodynamic Performance
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Recommended Tools & Equipment
Tested hardware and components for high reliability
Dissipative Silencer Acoustic Physics
Dissipative duct silencers utilize parallel sound-absorbing baffles (splitters) packed with high-density mineral wool. Sound waves entering the airway gaps penetrate into the porous fiber matrix where viscous friction converts acoustic wave energy into minute quantities of heat.
Airway Gap vs Baffle Thickness Trade-off
Low-frequency sound (125 Hz - 250 Hz) requires thick baffles ($t \ge 200\text{ mm}$) to absorb long wavelengths. High frequencies are readily absorbed by narrow gaps ($d \le 100\text{ mm}$). However, narrowing the airway chokes airflow, sharply driving up pressure drop and generating self-noise (aerodynamic hiss).