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 cloth for an introductory direction in engineering acoustics for college students with easy wisdom in arithmetic. within the moment, enlarged variation, the instructing facets of the publication were considerably better. conscientiously chosen examples illustrate the appliance of acoustic ideas and difficulties are supplied for training.

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

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Other examples of controlled couplers are the foil-strain gauge (a controlled resistor), the piezotransistor (a pressure-sensitive transistor), and the compressed-air loudspeaker in which an electromagnetic valve controls a stream of compressed air to generate sounds of up to 160 dB. 3 Fundamental Equations of Electroacoustic Transducers From an application standpoint, the most important electromechanic couplers are those where electric power is directly transformed into mechanic power, or vice versa.

To understand the characteristic features discussed above, it is helpful to realize that the loop equation3 holds for the quantities u, v ∆ and p ∆ , while the node equation holds for i, F , and q. In this book we prefer the electromechanic analogy # 2 for its topologic fidelity. Yet, this leads to a complication when mechanic and acoustic circuits are to be merged. If you want to connect an acoustic circuit with a mechanic one, for example, through its input impedance Z a , you may start with deriving the equivalent mechanic impedance, Z mech = A2 Z a .

17) The radiation impedance depends on the type of sound field. In the case of plane waves, it is a real quantity. We than have Z rad = r rad , where r rad is called radiation resistance. 5. 1 for details. 2. One way to ensure that the radiated power does not decrease below the limiting frequency is to increase the volume velocity with decreasing frequency according to the formula |v|2 ∼ 1 ! , which means |a| = ω |v| = constant . 18) For sound receivers, the coupling to the sound field depends on directional characteristics as well.

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