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New PDF release: Acoustical Measurements

By Leo L. Beranek

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Extra resources for Acoustical Measurements

Example text

Explosive Sources, Ed. M. Albers, Inst. Y. Used with permission of Plenum Press. 34 The following graph* (Fig. 16) shows the combined form of the spectra. Frequency (c/s) Fig. 16. PROBLEMS 1. For the equivalent circuit (Fig. 1 7 ) calculate: (a) the resonance frequency; (b) the mechanical Q; (c) the electrical Q; ( d ) the bandwidth if the driver impedance is high; (e) the bandwidth if the driver is matched; ( f ) the efficiency; and (g) the electromechanical coupling coefficient. 069 u f 0 2. For the above transducer, plot the motional admittance in the complex plane in the range 0 < w < 00.

Y. 39 force is the driving current (i) for the transducer acting as a projector, and the response is the open-circuit voltage ( V ) produced by the transducer acting as a hydrophone. Let branch B represent some point in the acoustic medium for which the pressure (pB) at that point is the medium’s response produced by the projector driven by the current (i), and the source strength ( Q ) * at the point is the generalized force that produces the open-circuit voltage response ( V ) in the transducer.

39 force is the driving current (i) for the transducer acting as a projector, and the response is the open-circuit voltage ( V ) produced by the transducer acting as a hydrophone. Let branch B represent some point in the acoustic medium for which the pressure (pB) at that point is the medium’s response produced by the projector driven by the current (i), and the source strength ( Q ) * at the point is the generalized force that produces the open-circuit voltage response ( V ) in the transducer.

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