Noise and vibration control engineering: principles and applications
Wiley, 1992 - 804 sider
Noise and Vibration Control Engineering is a completely new single-source guide to all aspects of noise and vibration control. It offers mechanical, acoustical, architectural, electrical and chemical engineers and students the engineering principles necessary for designing quiet conditions into industrial machinery motors, power plant equipment, air-conditioning systems, factories, buildings, and transportation systems. Contributors are among the world's leading acoustical scientists and consultants, many associated with Bolt Beranek and Newman Inc. Assuming only a general engineering background, Hoist and Vibration Control Engineering begins with an examination of acoustic basics: decibels, sound power, and the properties of the various sources that create noise. The book identifies key parameters which govern sound power output and examines how noise can be controlled at its sources. Readers learn how sound propagates outdoors, around or over barriers and in enclosed spaces such as rooms and vehicles. Noise and Vibration Control Engineering moves on to discuss the basic components of noise control: active noise control techniques, sound absorbers, mufflers, enclosures, wrappings, barriers, walls, vibration isolators and vibration damping materials and their proper use in solving common noise and vibration control problems. The book shows how to control noise caused by gas flows, ventilation systems, machines, reciprocating engines and gears. Finally, it examines to what level noise must be reduced so as not to affect work performance, enjoyment of speech, radio, TV and music at home or in public spaces or to damage hearing. In addition to offering techniques to assess problems, takemeasurements, and implement appropriate noise and vibration control treatments, Noise and Vibration Control Engineering contains a condensed collection of authoritative, up-to-date design information, criteria and references. Finally, it provides comprehensive information about laws and codes governing noise and its control.
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Levels and Decibels
Waves and Impedances
19 andre deler vises ikke
A-weighted A-weighted sound absorber absorption coefficient acoustical acoustical resonances active noise control amplitude approximately attenuation average barrier beam bending waves Beranek Beranek and Newman calculated components curve cylinder pressure damping decibels density determined direction distance duct effects elements energy engine equation estimated excitation exposure filter flow resistivity force Fourier series frequency range gear harmonic impedance increase insertion loss isolation layer longitudinal waves loss factor machine mass measured microphone mode muffler natural frequency Noise and Vibration noise levels noise source normal obtained octave bands parameters pipe plate porous predicted radiated radiation efficiency ratio reduced reverberation rotational shown in Fig signal silencer sound absorption sound field sound intensity sound level sound power level sound pressure level sound propagation sound source sound transmission loss Sound Vib sound wave spectra spectrum stiffness structure surface temperature thickness transfer function values velocity viscoelastic wavelength
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