Abstract
The time evolution of an oscillator coupled to an infinite string with a discontinuous mass density is investigated. It is shown that the equation of motion of the oscillator leads to a nonlinear characteristic equation due to the frequency-dependent nature of the point impedance of the string. Then, the method of perturbation theory is applied to solve the characteristic equation to first order in perturbation parameter. Finally, response of the oscillator to an impulse is obtained by means of the Green's function method.
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