This work discusses general oscillation equations of viscoelastic isotropic medium in linear approximation with and without consideration for initial shifts and stresses, as well as approximate oscillation equations with consideration for ambient environment and at small deformations. Under the impact of forces applied to continuous deformed body, the positional relationship of its particles varies, that is, the deformed body varies its shape and volume. This can be exemplified by compressed or tensioned rod. Mathematical description of deformation of solid body is given in this or that coordinate system. For instance, in Cartesian coordinates x1=x; x2=y; x3=z position of each point is defined by radius vector r ? and the components ? ? 1 2 3 x , x , x . After deformation, position of the point will be defined by another coordinates: ? ? 1 2 3 x?, x? , x? .
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