Noise control Vibration 80 Noise 67 Measurement 59 Acoustical engineering 46 Soundproofing 42 Industrial noise 37 Noise pollution 26 Absorption of sound 20 Fibers 19 Fibrous composites 19 Composite materials 17 Damping (Mechanics) 15 Signal processing 15 Digital techniques 13 Prevention 12 Architectural acoustics 11 Railroad trains 11 Sound 11 Electronic noise 9 Testing 9 Acoustics 8 Structural control (Engineering) 8 Acoustic emission testing 7 Machinery 7 Study environment 6 Adaptive signal processing 5 Automobiles 5 Hearing 5 Roofs 5