The frequency response of the console, discretized by three-dimensional finite elements, excited by a pulsating surface distributed load and mounted on a bilateral nonlinear elastic foundation, reaction forces of which are described by the third-degree polynomial, was investigated. The solution was performed in a program library for solving the problems of steady-state vibration of nonlinear dynamic systems, which is being developed in the MATLAB software. To describe the frequency response

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... e, the Crisfield's continuous arc length method with the secant predictor was applied. The harmonic balance method using the Alternating Frequency-Time scheme was used to evaluate the non-linear forces in each iteration of the solution to solve the steady-state vibration response in every continuation increment.