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By John G. Webster (Editor)

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An alternate definition of the sound absorption coefficient is as the fraction of the sound energy incident on a surface which is absorbed or dissipated. A convenient measure of the effectiveness of any absorptive treatment is, quite naturally, 128 ACOUSTIC VARIABLES MEASUREMENT the reverberation time, that is, the time interval during which the sound is audible after its source has been turned off. Quantitatively, the reverberation time is defined as the time required for the level of the sound to drop by 60 dB.

54 ACCOUNTING mechanisms. Because of antenna dynamics, shadowing, multipath effects, and the need for redundancy in critical systems such as aircraft, many of these systems will require inertial aiding tied in with accelerometers and gyros. With the development of micromachining, small and cost-effective GPS-assisted inertial systems will be available in the near future. These developments will require extensive signal processing with a high degree of accuracy. , 30 to 32 bits) need to be dealt with.

The number of terms may be infinite, and the higher the number of elements betters the approximation. These elements constitute the frequency spectrum. The vibrations can be represented in the time domain or frequency domain, both of which are extremely useful in the analysis. As an example, in Fig. 17, the time response of the seismic mass of an accelerometer is given against a rectangular pattern of excitation of the base. Stationary Random Vibrations. Random vibrations occur often in nature, where they constitute irregular cycles of motion that never repeat themselves exactly.

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