Acoustic Hardware Iteration Lab

Combustion Chamber Pressure Nodal Field (2D) 1.8m x 0.9m

HIGH RESONANT INSTABILITY

💡 Drag inside chamber to place/move damping baffles

FFT Resonant Frequency Spectrum Analyzer Peak: 556 Hz

Resonant Peak

556 Hz

Q-Factor

28.4

Acoustic Stress

88%

Damping Eff.

15%

Hardware Tuning Dock Acoustic Engineering

Helmholtz Resonator Target Freq 420 Hz

Overall Damping Coefficient 0.85

Chamber Length (L) 1.80 m

Propellant Mass Flow 120 kg/s

Dampener Baffles Position (0.0 to 1.0)

Design Report Summary

Firing Status: INACTIVE Peak Resonance: -- Hz Damping Efficiency: -- Iteration Status: Ready for Firing

Frequency scaling and heuristic damping dependencies

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The acoustic workbench uses a simplified longitudinal-mode equation. Its assumed speed of sound is one thousand meters per second. For length one point eight meters, one thousand divided by twice one point eight gives about two hundred seventy seven point seven eight hertz. Its added flow term is flow divided by one hundred times fifteen. With flow one hundred twenty, that term is eighteen, producing a rounded peak of two hundred ninety six hertz. These bars use one pixel per hertz and show the fundamental and rounded peak. The chamber diameter does not appear in this equation. This is the application model, not a validated rocket combustion simulation or a measured spectrum. Each baffle contributes a position-based factor. The code measures distance to the nearest of zero, one half and one, multiplies distance by four, subtracts from one and floors at zero. It then multiplies by point three five. A baffle at point one five contributes point one four. At point four five it contributes point two eight. At point two five it contributes zero. The two bars share one thousand pixels per contribution unit, reaching one hundred forty and two hundred eighty. This equation is an authored damping heuristic. Source comments about node cancellation do not constitute a physical derivation, and these positions do not establish a safe hardware design. The default coefficient point eight five contributes point one seven. Two baffles contribute point four two together. A Helmholtz target of four hundred twenty is one hundred twenty four hertz from the rounded peak two hundred ninety six; its tuning term is point one seven one. Combined damping is point seven six one, which displays seventy six percent. Quality factor is thirty five times one minus that damping, rounded to eight point four. While firing, stress uses this rounded quality factor and displays twenty four percent. With firing off, stress is zero and stable is false. The two bars show displayed damping seventy six and firing stress twenty four at four pixels per percentage point. These linked invented metrics are not independent measurements or safety certification.