The Journal of the Acoustical Society of America · 1963 · 138 citations · 0 references
Natural SciencesMechanical EngineeringPhysicsAcoustic DesignAcousticsBuilding PhysicsAcoustic ModelingAcoustic PerformanceBuilding AcousticsNoiseNoise ControlRoom AcousticsAcoustic EnclosuresAcoustic ResonanceAeroacoustic Noise ReductionCritical FrequencyEnclosure AcousticsLow-frequency AcousticsResonance FrequenciesWave Transmission
The study computes noise reduction for a small rigid enclosure with one flexible wall, assuming the wall’s critical frequency exceeds the enclosure’s first acoustic resonance, and analyzes low‑frequency stiffness‑controlled regimes, resonant wall–volume interactions, and resonant wall–space behavior, comparing the results to standard forced‑wave transmission loss calculations. The resulting noise reduction is lower than that predicted by the conventional approach.
The noise reduction produced by a small rigid enclosure with one flexible wall is computed. It is assumed that the critical frequency of the wall lies above the first acoustic resonance of the enclosure. The noise reduction is computed for very low frequencies where both wall and enclosed volume are stiffness-controlled, for frequencies where the wall is resonant and the volume is stiff, and for frequencies where both the wall and the acoustic space have resonant behavior. In the last case, a comparison made with the usual noise-reduction calculations based on forced wave-transmission loss. The noise reduction computed in this paper turns out to be less than the value computed by that more “classical” approach.