Download Engineering Noise Control Theory and Practice, Fourth by David A. Bies, Colin H. Hansen PDF

By David A. Bies, Colin H. Hansen

The emphasis of this variation is solely on passive technique of noise keep an eye on and the bankruptcy on energetic noise keep watch over that seemed within the moment and 3rd variants has been changed with a bankruptcy on functional numerical acoustics, the place it really is proven how unfastened, open resource software program can be utilized to resolve a few tough acoustics difficulties, that are too complicated for theoretical research. The removing of bankruptcy 12 on lively noise keep an eye on is in part because of loss of area and in part simply because a extra entire and a extra valuable remedy comes in the publication.

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Engineering Noise Control Theory and Practice, Fourth Edition

The emphasis of this variation is only on passive technique of noise regulate and the bankruptcy on energetic noise keep an eye on that seemed within the moment and 3rd variants has been changed with a bankruptcy on useful numerical acoustics, the place it truly is proven how loose, open resource software program can be utilized to resolve a few tough acoustics difficulties, that are too advanced for theoretical research.

Additional resources for Engineering Noise Control Theory and Practice, Fourth Edition

Example text

When an acoustic disturbance is produced, some work must be done on the conducting medium to produce the disturbance. Furthermore, as the disturbance propagates, as must be apparent, energy stored in the field is convected with the advancing disturbance. When the wave propagation is non-dispersive, the energy of the disturbance propagates with the speed of sound; that is, with the phase speed of the longitudinal compressional waves. On the other hand, when propagation is dispersive, the frequency components of the disturbance all propagate with different phase speeds; the energy of the disturbance, however, propagates with the group speed.

Previous experience or the local weather bureau can provide expected ranges in atmospheric weather conditions (wind and temperature gradients and turbulence levels) so that a likely range and worst case sound levels can be predicted for each community location. When directivity information is not available, it is generally assumed that the source radiates uniformly in all directions. If the estimated noise levels at any sensitive location exceed the established criteria, then the equipment contributing most to the excess levels should be targeted for noise control, which could take the form of: • • • specifying lower equipment sound power levels, or sound pressure levels at the operator position, to the equipment manufacturer; including noise-control fixtures (mufflers, barriers, enclosures, or factory walls with a higher sound transmission loss) in the factory design; or rearrangement and careful planning of buildings and equipment within them.

However, this extension is not possible for other than the cases stated. 4), the acoustic pressure and particle velocity are always in phase and the reactive intensity is identically zero in all cases. 1 Definitions In the following analysis and throughout this book, vector quantities are represented as bold font. The subscript, 0, is used to represent an amplitude. Sound intensity is a vector quantity determined as the product of sound pressure and the component of particle velocity in the direction of the intensity vector.

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