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 uncomplicated wisdom in arithmetic. within the moment, enlarged version, the instructing facets of the publication were considerably superior. conscientiously chosen examples illustrate the appliance of acoustic ideas and difficulties are supplied for training.
"Acoustics for Engineers" is designed for vast educating on the college point. below the information of a tutorial instructor it truly is enough because the sole textbook for the topic. every one bankruptcy offers 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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Extra resources for Acoustics for Engineers: Troy Lectures
33) and amounts to t1 Wr = r v(t)2 dt , and, thus Pr = r 0 d dt t1 v(t)2 dt . 36) 0 Averaging over a full period, T , with arbitrary φ, finally results in T 1 1 1 r vˆ2 T = r vˆ2 = Fˆ vˆ = F rms v rms . 37) At the dashpot v and F are in phase, which means that the supplied power is purely resistive (active) power. This holds for the complete system when driven at its characteristic frequency. Off this frequency, additional reactivepower is needed to keep the system stationarily oscillating. 6 Basic Elements of Linear, Oscillating, Acoustic Systems In addition to the mechanic elements, there is a further class of elements for oscillators that are traditionally called acoustic elements.
This figure will be the basis for the rest of this chapter. 2 The Carbon Microphone – A Controlled Coupler An important class of electromechanic couplers consists of couplers where the signal-representing quantities in one network, mechanic or electric, accomplish the coupling by controlling elements of the other network. An illustrative historic example is the carbon microphone, which was an important part of telephone technology for about a century and was, during that period, the most frequently-used microphone type worldwide.
If a DC current is applied to this arrangement, the current will be superimposed on an alternating current as the resistor varies. 3. Typical carbon microphones have a sensitivity of Tup ≈ 500 mV/Pa, which corresponds to 500 mV for a 94-dB sound. Several disadvantages should be mentioned though. First, carbone microphones produce many upper harmonics with a power of up to 25% of the fundamental harmonic. Second, they generate quite a bit of internal noise, and, finally, they are power consuming.
Acoustics for Engineers: Troy Lectures by Jens Blauert, Ning Xiang