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The Wave Theory of Sound
Eulers Equation of Motion for a Fluid
Equations of Linear Acoustics
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absorption coeﬂicient acoustic energy acoustic ﬁeld acoustic impedance acoustic inertance acoustic power acoustic pressure acoustic-pressure ambient amplitude analogous angle angular frequency applies approximation asymptotic average axis band boundary condition circular complex amplitude component constant constant-frequency coordinates corresponding decibels deﬁned deﬁnition derived described diffraction direction distance duct energy density example expression factor ﬁlter ﬁnite ﬁrst ﬁxed ﬂow ﬂuid velocity Fourier function given Helmholtz Helmholtz equation Helmholtz resonator identiﬁed integral interface limit muﬂler normal ofthe oriﬁce oscillating piston plane wave plane-wave plate power output propagation quantity radiation radiation impedance radius ratio Rayleigh reﬂection relation replaced resonance reverberation rigid satisﬁes solution sound level sound speed sound-pressure level spatial spectral density sphere spherical suﬂiciently surface surface integral theorem Theory tion transducer tube unit variable vector vibrating volume velocity wall wave equation waveform wavefront wavelength yields zero