By Lekhnit︠s︡kiĭ S. G.
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Extra resources for Anisotropic plates
The disturbance travels on, but the propagating particles do their little dance close to home. There are three distinct forms of particle motion. If a stone is dropped on a calm water surface, concentric waves travel out from the point of impact, and the water particles trace circular orbits (for deep water, at least) as in Fig. 1-5(A). Another type of wave motion is illustrated by a violin string, Fig. 1-5(B). The tiny elements of the string move transversely, or at right angles to the direction of travel of the waves along the string.
Figure 1-11B shows another sine wave half the amplitude and twice the frequency (f2). Combining A and B at each point in time the waveshape of Fig. 1-11C is obtained. In Fig. 1-11D, another sine wave half the amplitude of A and three times its frequency (f3) is shown. Adding this to the f1 ϩ f2 wave of C, Fig. 1-11E is obtained. The simple sine wave of Fig. 1-11A has been progressively distorted as other sine waves have been added to it. Whether these are acoustic waves or electronic signals, the process can be reversed.
Use network A. use network B. use network C. These network response shapes are designed to bring the sound level meter readings into closer conformance to the relative loudness of sounds. 10 Relative response - dB 0 C Ϫ10 B Ϫ20 A Ϫ30 Ϫ40 20 100 1 kHz 10 kHz Frequency - Hz FIGURE 2-3 A, B, and C weighting response characteristics for sound level meters. ) 39 This page intentionally left blank.