New PDF release: Acoustics for Engineers: Troy Lectures

By Jens Blauert

ISBN-10: 364203392X

ISBN-13: 9783642033926

Blauert's and Xiang's Acoustics for Engineers provides the cloth for an introductory direction in engineering acoustics for college kids with easy wisdom in arithmetic. within the moment, enlarged variation, the instructing features of the booklet were considerably more suitable. rigorously chosen examples illustrate the applying of acoustic rules and difficulties are supplied for training.

Acoustics for Engineers is designed for huge instructing on the college point. lower than the information of a tutorial instructor it truly is adequate 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 exchange among extra theoretical and extra application-oriented concepts.

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Consequently, the effective mass is m1 m2 mΣ = . 9 shows a simple cavity resonator with two finite compliances, otherwise known as an acoustic oscillator . Such closed-cavity resonators are, for example, applied for calibration of microphones because they are well insulated 3 Recall that in electrical terms the loop equation is u n = 0, with n = 1, 2, 3, · · ·, meaning that by completely circling a mesh we end at the same electric potential. 7 Examples of Mechanic and Acoustic Oscillators 35 Fig.

This portion is 5 Γ , the directional characteristic, is the ratio of the magnitude of the driving force taken for a sound incidence from a certain direction compared to the magnitude of the driving force in the direction of maximum sensitivity 48 4 Electromechanic and Electroacoustic Transduction −−−→ p ∆ = grad p ∆x cos δ . 21) The directional characteristic – depicted in Fig. 12 (b) – turns out to be Γ = cos δ . 22) This is called the figure-of-eight characteristic. The plus signs and minus signs in the plot denote a 0◦ - or 180◦ -phase difference, respectively, between the pressure-gradient signal and the electric output signal.

This can be avoided by producing high and low frequencies with different loudspeakers. This arrangement – illustrated in Fig. 6 – consists of a tweeter for high frequencies and a woofer for low frequencies. The frequency-cross-over network must be carefully designed. Fig. 6. 2 Magnetodynamic Sound Emitters and Receivers 61 Magnetodynamic tweeters2 (dome tweeters) look very much like the movingcoil microphone shown in Fig. 10. To avoid focussing directional characteristics at high frequencies, more than one tweeter can be employed.

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Acoustics for Engineers: Troy Lectures by Jens Blauert

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