VIBRATION ANALYSIS OF AN ABOVE-GROUND GAS PIPELINE AT WIND RESONANCE

Abstract

The article considers an active method for damping wind self-sustained oscillations of an above-ground gas pipeline model, which allows the system to be tuned from the resonance frequen-cy by changing its design scheme. The method consists in installing an oscillation damping device in one of the spans of the design model, functioning on the principle of one-way operation. A new mathematical model of oscillations with a symmetric deformation of the axis of the above-ground gas pipeline is proposed. The non-stationary dynamic process is realized within the framework of the theory of time analysis. Integration of the motion equation is performed in matrix form for a system with a finite number of the degrees of freedom and taking into account internal friction. A numerical example is used to compare computational models with a symmetric and skew-symmetric natural mode of oscillation and show the effectiveness of the proposed approach with a symmetric shape.