Sound-waves Sound 27 Vibration 25 Transmission 19 Architectural acoustics 11 Mathematical models 9 Radiation sources 9 Acoustical engineering 7 Soundproofing 7 Structural dynamics 7 Measurement 6 Acoustics 5 Thin-walled structures 5 Acoustic imaging 4 Radiation 4 Scattering 4 Underwater acoustics 4 Acoustic impedance 3 Diffraction 3 Geometrical diffraction 3 Helmholtz equation 3 Radiation Effects 3 Thermodynamics 3 Wave-motion, Theory of 3 Aerodynamic noise 2 Air conditioning 2 Apparatus 2 Computer simulation 2 Equipment and supplies 2 Noise control 2