near field

5.05  near field. The acoustic field so close to an extended source that the effects of the source size are manifest in measurements. Annotation              For a source of extent L, the...

far field

5.04  far field. The acoustic field sufficiently distant from a distributed source that the sound pressure decreases linearly with increasing distance (neglecting reflections, refraction, and absorption). Annotation...

sound field

5.03  sound field. Spatial distribution of acoustic variables such as pressure and particle motion at an...

mechanical transmission system

5.02  mechanical transmission system. Assembly of mass, mechanical stiffness, and mechanical resistance, adapted to the transmission of mechanical...

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