Vibration analysis of an above-ground gas pipeline at wind resonance

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 frequency 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.