Oscillations of Pipelines Laid on Supports in the Conditions of Aerodynamic Resonance

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Authors: Tokarev, A, Valeev, A, Nurutdinova, K
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2020
• Subjects: permafrost
• Online Access: http://dx.doi.org/10.1088/1755-1315/459/3/032017; https://iopscience.iop.org/article/10.1088/1755-1315/459/3/032017/pdf; https://iopscience.iop.org/article/10.1088/1755-1315/459/3/032017

Abstract Above-ground laying of field and main oil and gas pipelines is one of the most common methods in the conditions of the North and permafrost soils, as well as at the intersection of ravines, canals, small rivers, in rocky soils, in areas of mine workings and landslides. Under the influence of wind, above-ground pipelines can experience oscillations whose frequency is usually equal to the frequency of the fundamental tone of free oscillations. Oscillations occur not only along, but also across the wind flow. The amplitude of oscillations across the flow is greater than the amplitude of vibration along the flow. At certain values of wind speed, the amplitude of oscillations increases sharply. As a rule, when designing, in calculating the distances between the supports, in most cases this phenomenon is not taken into account and the conditions for the occurrence of aerodynamic resonance when the natural frequencies of the pipeline oscillations and the frequency of vortex formation are close are not checked. In the paper the maximum allowable distances between the supports of various above-ground pipelines are determined taking into account the detuning from wind resonance from the condition of a certain critical wind speed.