Noise Reduction: Prepared for a Special Summer Program at the Massachusetts Institute of TechnologyLeo Leroy Beranek The field of acoustics has many branches, but none is developing more rapidly than noise control. Noise has assumed an importance in national thinking that could hardly have been believed two decades ago. The control of noise must be considered at all stages of the design and engineering of airports, aircraft, buildings, home appliances, industrial machinery, automobiles, and cities--particularly in residential and industrial areas. This book, which is intended to be readable by graduate engineers in nearly any technical field, presents the material in graded technical levels, with simpler concepts, apparatus, and techniques appearing first, followed by more specialized and complex techniques. No effort has been made to produce a handbook or all-inclusive compendium. Rather, this text seeks to lead the reader by gradual steps from the beginning of the subject into the more advanced aspects. The text contains many numerical examples and frequent comparison of measured with calculated data and gives practical details of construction. |
Contents
Foreword | 1 |
InstrumentationG W Kamperman | 103 |
Some Practical Acoustical MeasurementsN Doelling D L Klepper | 111 |
Copyright | |
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10,000 Frequency band absorption coefficient accelerometers acoustical materials air-borne aircraft angle approximately average bending wave Beranek and Newman blanket calculated calibration ceiling Chap constant cps FIG curve damping decibels density determined distance effects enclosure engine example factor floating floor flow resistance ft² grille incidence insertion loss instrument intensity lb/ft² level in band levels measured machine maximum microbar microphone mounting muffler Noise Control noise levels noise reduction noise source normal obtained octave octave-band octave-band analyzer over-all panel peak plane plaster plate power level pressure level problem propagation quency R₁ radiated range ratio resonance reverberation rubber shown in Fig sound field sound power sound wave sound-level meter sound-power level sound-pressure level space spectrum structure surface Table temperature thickness tion transmission loss tube turbojet units values velocity vibration wall watt wavelength