The radiation impedance and the energy partition among wave fields generated by a normal force strip radiator on isotropic solid surface

The radiation impedance and energy partition among elastic waves generated by a normal force strip radiator on isotropic solid surface are investigated in this paper.Two methods are used to obtain the radiation energy.One is to get the total radiation energy from the radiation conductance.And the other is to get energy of each elastic wave at far field.The results indicate:(1) the energy ratio of the longitudinal wave increases with the width of the radiator becoming wider;(2) the energy of each elastic wave is naerly same while the width of the radiator changes in a small range;(3) for different width of the radiator,the total energy gotten from the radiation conductance is equal to the energy sum of each wave gotten at far field.This not only proves the conservation of the energy for generated elastic waves,but also mutually reflects that approximate expressions of wave fields obtained from the method of the steepest descents are correct.