Engineering Noise Control: Theory and Practice - download pdf or read online

By David A. Bies, Colin H. Hansen

ISBN-10: 0203872401

ISBN-13: 9780203872406

ISBN-10: 0415487064

ISBN-13: 9780415487061

ISBN-10: 0415487072

ISBN-13: 9780415487078

I've got spent a few years within the acoustics box and this publication is the bible of business acoustics.

Having acknowledged that, this isn't the "easiest" booklet to learn and comprehend. it truly is aimed for these pursuing complex experiences in acoustics and acoustic regulate, with the idea the reader has an intensive figuring out of the basics of math and physics.

The first few chapters within the e-book do provide a quick advent to sound (from a physics viewpoint) and calculating sound degrees for numerous assets. a person conversant in this knowledge will realize the knowledge has no longer been considerably altered from Beranek's texts. a few info is given for present future health & safeguard laws yet this can be quite particular to the USA. The preliminary chapters should not enough for somebody new to the sphere of acoustics.

The "meat" of the ebook supplies colossal therapy to noise keep an eye on equipment, noise in rooms, layout of abatement apparatus (both indoor and outdoor), business purposes and so on. in spite of the fact that back the first technique is from a mathematical/physics improvement. this doesn't suggest one can't instantly use the knowledge successfully. the straightforward fact is noise abatement isn't a "simple" box and the e-book does not try to "simplify" the complex material.

The re-creation of this booklet supplies a superb (if short) description of the rising box of lively noise regulate. the first drawback of this region isn't the author's fault - there is not sufficient sensible facts for lively noise regulate at present.

One downfall of this ebook as a textual content is that very only a few examples are supplied for a pupil, and within the new edition no bankruptcy questions are integrated. For a pupil, i'd suggest buying the 2d variation of the textual content for the bankruptcy questions.

Overally, a good source for the skilled practioneer or complicated pupil.

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Extra resources for Engineering Noise Control: Theory and Practice

Example text

1) The effect of boundaries on the longitudinal wave speed will now be considered but with an important omission for the purpose of simplification. The discussion will not include boundaries between solids, which generally is a seismic wave propagation problem not ordinarily encountered in noise control problems. Only propagation at boundaries between solids and fluids and between fluids will be considered, as they affect longitudinal wave propagation. 12) is generally so great that the effect of the gas on wave propagation in the solid may be neglected; in such cases the gas may be considered to be a simple vacuum in terms of its effect on wave propagation in the solid.

The simplest way to do this is to measure the noise levels in octave frequency bands at a number of locations in the engine room with the engine running, and also at locations in the ship where the noise is excessive. Then the engine should be shut down and a loudspeaker placed in the engine room and driven so that it produces noise levels in the engine room sufficiently high for them to be readily detected at the locations where noise reduction is required. Usually an octave band filter is used with the speaker so that only noise in the octave band of interest at any one time is generated.

2 Plane Wave Propagation For the case of plane wave propagation, only one spatial dimension, x, the direction of propagation is required to describe the acoustic field. An example of plane wave propagation is sound propagating along the centre line of a rigid wall tube. 17) describes a distribution along the x axis at any fixed time, t, as well as the variation with time at any fixed place, x, along the direction of propagation. If the argument (ct ± x) is fixed and the positive sign is chosen then with increasing time, t, x, must decrease with speed, c.

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