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Solid bodies in contact that undergo shear relative motion radiate energy. Part of this energy is radiated directly into the surrounding fluid media, and another part radiates throughout the solid bides and the connecting boundary conditions. The coupling of structural vibration and acoustic radiation takes is rooted in the mechanism of atomic oscillations, by which kinetic energy is translated to thermal energy.
This field involves principles of acoustics, solid mechanics, contact dynamics, and tribology.
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