Acoustics for Engineers: Troy Lectures by Jens Blauert, Ning Xiang

By Jens Blauert, Ning Xiang

Blauert's and Xiang's "Acoustics for Engineers" presents the fabric for an introductory path in engineering acoustics for college students with simple wisdom in arithmetic. within the moment, enlarged variation, the instructing points of the publication were considerably superior. conscientiously chosen examples illustrate the applying of acoustic rules and difficulties are supplied for training.

"Acoustics for Engineers" is designed for broad instructing on the college point. less than the information of an educational instructor it's adequate because the sole textbook for the topic. each one bankruptcy offers with a good outlined subject and represents the fabric for a two-hour lecture. The 15 chapters trade among extra theoretical and extra application-oriented concepts.

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This is an auditory event with a distinct pitch that can be varied by filling the bottle with some water. What happens when the bottle is blown on? 6 Fig. 8. 8 schematically illustrates the Helmholtz resonator with friction that causes damping. The three elements, mass, damping and spring, are connected in cascade (chain), so that the total pressure results in p Σ = p ∆m + p ∆r + p ∆n . 42) By dividing pΣ by the volume velocity, q, we arrive at the acoustic impedance, Z a , namely, p 1 . 5 Normally we do not experience the spring characteristics of air because the air can evacuate, but the effect in this case is similar to operating a tire pump with the opening hole pressed closed 3 Electromechanic and Electroacoustic Analogies During the discussion of simple mechanic and acoustic oscillators in Chapter 2, readers with some electrical engineering experience may have realized that many mathematical formulae are similar to those that appear when dealing with electric oscillators.

Electromechanic analogies for mono-, dual- and triple-port elements For electroacoustic analogies, ˆ Chains of acoustic elements result in chains of electric elements. The singleport spring and its analogous electric element form end elements ˆ Parallel branching of acoustic elements leads to parallel branching of electric elements Fig. 6. 5 Synopsis of Electric Analogies of Simple Oscillators The schematic in Fig. 6 shows how the electric analogies are derived for mechanic parallel-branch oscillators, often simply called parallel oscillators, and further, how the electric analogies are derived for mechanic serial-branch oscillators, often simply called serial oscillators.

We will now concentrate on transducers that transform power using force effects in electromagnetic fields. In such transducers the Lorentz force is effective. 5) or, in expanded form, with l being the path of i in the B-field, → → → → F = (C u) E + i ( l × B ) . 6) → If we assume the simple case in which the electric field strength, E , and the → magnetic-flux density, B , are constant, we can derive the following principles from these equations for the forces in transducers1 . ˆ For purely electric fields the force, F , is proportional to the voltage, u ˆ For purely magnetic fields the force, F , is proportional to the current, i Real transducers have additional components beyond the actual energytransducing elements.

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