Jens Blauert's Acoustics for Engineers: Troy Lectures PDF

Acoustics Sound

By Jens Blauert

ISBN-10: 364203392X

ISBN-13: 9783642033926

Blauert's and Xiang's Acoustics for Engineers provides the fabric for an introductory direction in engineering acoustics for college students with simple wisdom in arithmetic. within the moment, enlarged version, the educating elements of the publication were considerably greater. conscientiously chosen examples illustrate the appliance of acoustic rules and difficulties are supplied for training.

Acoustics for Engineers is designed for vast instructing on the collage point. lower than the information of a tutorial instructor it really is enough because the sole textbook for the topic. every one bankruptcy bargains with a good outlined subject and represents the fabric for a two-hour lecture. The 15 chapters exchange among extra theoretical and extra application-oriented concepts.

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Extra resources for Acoustics for Engineers: Troy Lectures

Example text

Please note for all plots of directional characteristics that they have to be considered as three-dimensional, although only the vertical projection is shown here. Fig. 12. 12 (a) illustrates the construction of pressure-gradient receivers. As with the pressure receivers, the linear dimensions are small compared to the wavelength. There are two membranes, one on each side of the otherwise closed volume, and each having effective area A. The movable component is coupled to the membrane in such a way that its driving force is equal to the difference of the forces affecting each membrane.

Fig. 1. Black-box representations of a coupling element, (a) three-port representation, (b) two-port representation The power that is transported into the movable component is P∆= 1 F v∗ . 1) Fig. 2. Schematic representation of a coupling element, distinguishing mobile components and components blocked to the housing The schema shown in Fig. 2 is the result of counting all masses rigidly blocked to the housing as part of the housing mass, m. 2) which consequently leads to F∆= F 1 v ∗1 − F 2 v ∗2 v ∗1 − v ∗2 with v∆ = v1 −v2.

Spherical waves are predominately emitted in this frequency range, and, below a limiting frequency ω , the real part of the radiation impedance, Z rad , increases proportional to ω 2 . The radiated power situation depicted in Fig. 7 accounts for both of these effects. In Fig. 7 it is assumed that the system is excited with a constant force, F , which is equivalent to constant-current excitation. Fig. 7. Tuning the frequency response of dynamic loudspeakers Tuning the mechanic resonance to lower frequencies extends the range.

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Acoustics for Engineers: Troy Lectures by Jens Blauert

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